//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
//  This source code is licensed under both the GPLv2 (found in the
//  COPYING file in the root directory) and Apache 2.0 License
//  (found in the LICENSE.Apache file in the root directory).
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.

#include "rocksdb/customizable.h"

#include <cctype>
#include <cinttypes>
#include <cstring>
#include <unordered_map>

#include "db/db_test_util.h"
#include "options/options_helper.h"
#include "options/options_parser.h"
#include "port/stack_trace.h"
#include "rocksdb/convenience.h"
#include "rocksdb/env_encryption.h"
#include "rocksdb/file_checksum.h"
#include "rocksdb/flush_block_policy.h"
#include "rocksdb/memory_allocator.h"
#include "rocksdb/rate_limiter.h"
#include "rocksdb/secondary_cache.h"
#include "rocksdb/slice_transform.h"
#include "rocksdb/sst_partitioner.h"
#include "rocksdb/statistics.h"
#include "rocksdb/utilities/customizable_util.h"
#include "rocksdb/utilities/object_registry.h"
#include "rocksdb/utilities/options_type.h"
#include "table/block_based/flush_block_policy.h"
#include "table/mock_table.h"
#include "test_util/mock_time_env.h"
#include "test_util/testharness.h"
#include "test_util/testutil.h"
#include "util/file_checksum_helper.h"
#include "util/rate_limiter.h"
#include "util/string_util.h"
#include "utilities/compaction_filters/remove_emptyvalue_compactionfilter.h"
#include "utilities/memory_allocators.h"
#include "utilities/merge_operators/bytesxor.h"
#include "utilities/merge_operators/sortlist.h"
#include "utilities/merge_operators/string_append/stringappend.h"
#include "utilities/merge_operators/string_append/stringappend2.h"

#ifndef GFLAGS
bool FLAGS_enable_print = false;
#else
#include "util/gflags_compat.h"
using GFLAGS_NAMESPACE::ParseCommandLineFlags;
DEFINE_bool(enable_print, false, "Print options generated to console.");
#endif  // GFLAGS

namespace ROCKSDB_NAMESPACE {
namespace {
class StringLogger : public Logger {
 public:
  using Logger::Logv;
  void Logv(const char* format, va_list ap) override {
    char buffer[1000];
    vsnprintf(buffer, sizeof(buffer), format, ap);
    string_.append(buffer);
  }
  const std::string& str() const { return string_; }
  void clear() { string_.clear(); }

 private:
  std::string string_;
};

class TestCustomizable : public Customizable {
 public:
  TestCustomizable(const std::string& name) : name_(name) {}
  // Method to allow CheckedCast to work for this class
  static const char* kClassName() {
    return "TestCustomizable";
  }

  const char* Name() const override { return name_.c_str(); }
  static const char* Type() { return "test.custom"; }
#ifndef ROCKSDB_LITE
  static Status CreateFromString(const ConfigOptions& opts,
                                 const std::string& value,
                                 std::unique_ptr<TestCustomizable>* result);
  static Status CreateFromString(const ConfigOptions& opts,
                                 const std::string& value,
                                 std::shared_ptr<TestCustomizable>* result);
  static Status CreateFromString(const ConfigOptions& opts,
                                 const std::string& value,
                                 TestCustomizable** result);
#endif  // ROCKSDB_LITE
  bool IsInstanceOf(const std::string& name) const override {
    if (name == kClassName()) {
      return true;
    } else {
      return Customizable::IsInstanceOf(name);
    }
  }

 protected:
  const std::string name_;
};

struct AOptions {
  static const char* kName() { return "A"; }
  int i = 0;
  bool b = false;
};

static std::unordered_map<std::string, OptionTypeInfo> a_option_info = {
#ifndef ROCKSDB_LITE
    {"int",
     {offsetof(struct AOptions, i), OptionType::kInt,
      OptionVerificationType::kNormal, OptionTypeFlags::kMutable}},
    {"bool",
     {offsetof(struct AOptions, b), OptionType::kBoolean,
      OptionVerificationType::kNormal, OptionTypeFlags::kNone}},
#endif  // ROCKSDB_LITE
};

class ACustomizable : public TestCustomizable {
 public:
  explicit ACustomizable(const std::string& id)
      : TestCustomizable("A"), id_(id) {
    RegisterOptions(&opts_, &a_option_info);
  }
  std::string GetId() const override { return id_; }
  static const char* kClassName() { return "A"; }

 private:
  AOptions opts_;
  const std::string id_;
};

struct BOptions {
  std::string s;
  bool b = false;
};

static std::unordered_map<std::string, OptionTypeInfo> b_option_info = {
#ifndef ROCKSDB_LITE
    {"string",
     {offsetof(struct BOptions, s), OptionType::kString,
      OptionVerificationType::kNormal, OptionTypeFlags::kNone}},
    {"bool",
     {offsetof(struct BOptions, b), OptionType::kBoolean,
      OptionVerificationType::kNormal, OptionTypeFlags::kNone}},
#endif  // ROCKSDB_LITE
};

class BCustomizable : public TestCustomizable {
 private:
 public:
  explicit BCustomizable(const std::string& name) : TestCustomizable(name) {
    RegisterOptions(name, &opts_, &b_option_info);
  }
  static const char* kClassName() { return "B"; }

 private:
  BOptions opts_;
};

#ifndef ROCKSDB_LITE
static bool LoadSharedB(const std::string& id,
                        std::shared_ptr<TestCustomizable>* result) {
  if (id == "B") {
    result->reset(new BCustomizable(id));
    return true;
  } else if (id.empty()) {
    result->reset();
    return true;
  } else {
    return false;
  }
}

static int A_count = 0;
static int RegisterCustomTestObjects(ObjectLibrary& library,
                                     const std::string& /*arg*/) {
  library.AddFactory<TestCustomizable>(
      ObjectLibrary::PatternEntry("A", true).AddSeparator("_"),
      [](const std::string& name, std::unique_ptr<TestCustomizable>* guard,
         std::string* /* msg */) {
        guard->reset(new ACustomizable(name));
        A_count++;
        return guard->get();
      });

  library.AddFactory<TestCustomizable>(
      "S", [](const std::string& name,
              std::unique_ptr<TestCustomizable>* /* guard */,
              std::string* /* msg */) { return new BCustomizable(name); });
  size_t num_types;
  return static_cast<int>(library.GetFactoryCount(&num_types));
}
#endif  // ROCKSDB_LITE

struct SimpleOptions {
  static const char* kName() { return "simple"; }
  bool b = true;
  std::unique_ptr<TestCustomizable> cu;
  std::shared_ptr<TestCustomizable> cs;
  TestCustomizable* cp = nullptr;
};

static SimpleOptions dummy_simple_options;
template <typename T1>
int offset_of(T1 SimpleOptions::*member) {
  return static_cast<int>(
      reinterpret_cast<uintptr_t>(
          std::addressof(dummy_simple_options.*member)) -
      reinterpret_cast<uintptr_t>(std::addressof(dummy_simple_options)));
}

static std::unordered_map<std::string, OptionTypeInfo> simple_option_info = {
#ifndef ROCKSDB_LITE
    {"bool",
     {offset_of(&SimpleOptions::b), OptionType::kBoolean,
      OptionVerificationType::kNormal, OptionTypeFlags::kNone}},
    {"unique",
     OptionTypeInfo::AsCustomUniquePtr<TestCustomizable>(
         offset_of(&SimpleOptions::cu), OptionVerificationType::kNormal,
         OptionTypeFlags::kAllowNull)},
    {"shared",
     OptionTypeInfo::AsCustomSharedPtr<TestCustomizable>(
         offset_of(&SimpleOptions::cs), OptionVerificationType::kNormal,
         OptionTypeFlags::kAllowNull)},
    {"pointer",
     OptionTypeInfo::AsCustomRawPtr<TestCustomizable>(
         offset_of(&SimpleOptions::cp), OptionVerificationType::kNormal,
         OptionTypeFlags::kAllowNull)},
#endif  // ROCKSDB_LITE
};

class SimpleConfigurable : public Configurable {
 private:
  SimpleOptions simple_;

 public:
  SimpleConfigurable() { RegisterOptions(&simple_, &simple_option_info); }

  explicit SimpleConfigurable(
      const std::unordered_map<std::string, OptionTypeInfo>* map) {
    RegisterOptions(&simple_, map);
  }
};

#ifndef ROCKSDB_LITE
static void GetMapFromProperties(
    const std::string& props,
    std::unordered_map<std::string, std::string>* map) {
  std::istringstream iss(props);
  std::unordered_map<std::string, std::string> copy_map;
  std::string line;
  map->clear();
  for (int line_num = 0; std::getline(iss, line); line_num++) {
    std::string name;
    std::string value;
    ASSERT_OK(
        RocksDBOptionsParser::ParseStatement(&name, &value, line, line_num));
    (*map)[name] = value;
  }
}
#endif  // ROCKSDB_LITE
}  // namespace

#ifndef ROCKSDB_LITE
Status TestCustomizable::CreateFromString(
    const ConfigOptions& config_options, const std::string& value,
    std::shared_ptr<TestCustomizable>* result) {
  return LoadSharedObject<TestCustomizable>(config_options, value, LoadSharedB,
                                            result);
}

Status TestCustomizable::CreateFromString(
    const ConfigOptions& config_options, const std::string& value,
    std::unique_ptr<TestCustomizable>* result) {
  return LoadUniqueObject<TestCustomizable>(
      config_options, value,
      [](const std::string& id, std::unique_ptr<TestCustomizable>* u) {
        if (id == "B") {
          u->reset(new BCustomizable(id));
          return true;
        } else if (id.empty()) {
          u->reset();
          return true;
        } else {
          return false;
        }
      },
      result);
}

Status TestCustomizable::CreateFromString(const ConfigOptions& config_options,
                                          const std::string& value,
                                          TestCustomizable** result) {
  return LoadStaticObject<TestCustomizable>(
      config_options, value,
      [](const std::string& id, TestCustomizable** ptr) {
        if (id == "B") {
          *ptr = new BCustomizable(id);
          return true;
        } else if (id.empty()) {
          *ptr = nullptr;
          return true;
        } else {
          return false;
        }
      },
      result);
}
#endif  // ROCKSDB_LITE

class CustomizableTest : public testing::Test {
 public:
  CustomizableTest() {
    config_options_.invoke_prepare_options = false;
#ifndef ROCKSDB_LITE
    // GetOptionsFromMap is not supported in ROCKSDB_LITE
    config_options_.registry->AddLibrary("CustomizableTest",
                                         RegisterCustomTestObjects, "");
#endif  // ROCKSDB_LITE
  }

  ConfigOptions config_options_;
};

#ifndef ROCKSDB_LITE  // GetOptionsFromMap is not supported in ROCKSDB_LITE
// Tests that a Customizable can be created by:
//    - a simple name
//    - a XXX.id option
//    - a property with a name
TEST_F(CustomizableTest, CreateByNameTest) {
  ObjectLibrary::Default()->AddFactory<TestCustomizable>(
      ObjectLibrary::PatternEntry("TEST", false).AddSeparator("_"),
      [](const std::string& name, std::unique_ptr<TestCustomizable>* guard,
         std::string* /* msg */) {
        guard->reset(new TestCustomizable(name));
        return guard->get();
      });
  std::unique_ptr<Configurable> configurable(new SimpleConfigurable());
  SimpleOptions* simple = configurable->GetOptions<SimpleOptions>();
  ASSERT_NE(simple, nullptr);
  ASSERT_OK(
      configurable->ConfigureFromString(config_options_, "unique={id=TEST_1}"));
  ASSERT_NE(simple->cu, nullptr);
  ASSERT_EQ(simple->cu->GetId(), "TEST_1");
  ASSERT_OK(
      configurable->ConfigureFromString(config_options_, "unique.id=TEST_2"));
  ASSERT_NE(simple->cu, nullptr);
  ASSERT_EQ(simple->cu->GetId(), "TEST_2");
  ASSERT_OK(
      configurable->ConfigureFromString(config_options_, "unique=TEST_3"));
  ASSERT_NE(simple->cu, nullptr);
  ASSERT_EQ(simple->cu->GetId(), "TEST_3");
}

TEST_F(CustomizableTest, ToStringTest) {
  std::unique_ptr<TestCustomizable> custom(new TestCustomizable("test"));
  ASSERT_EQ(custom->ToString(config_options_), "test");
}

TEST_F(CustomizableTest, SimpleConfigureTest) {
  std::unordered_map<std::string, std::string> opt_map = {
      {"unique", "id=A;int=1;bool=true"},
      {"shared", "id=B;string=s"},
  };
  std::unique_ptr<Configurable> configurable(new SimpleConfigurable());
  ASSERT_OK(configurable->ConfigureFromMap(config_options_, opt_map));
  SimpleOptions* simple = configurable->GetOptions<SimpleOptions>();
  ASSERT_NE(simple, nullptr);
  ASSERT_NE(simple->cu, nullptr);
  ASSERT_EQ(simple->cu->GetId(), "A");
  std::string opt_str;
  std::string mismatch;
  ASSERT_OK(configurable->GetOptionString(config_options_, &opt_str));
  std::unique_ptr<Configurable> copy(new SimpleConfigurable());
  ASSERT_OK(copy->ConfigureFromString(config_options_, opt_str));
  ASSERT_TRUE(
      configurable->AreEquivalent(config_options_, copy.get(), &mismatch));
}

TEST_F(CustomizableTest, ConfigureFromPropsTest) {
  std::unordered_map<std::string, std::string> opt_map = {
      {"unique.id", "A"}, {"unique.A.int", "1"},    {"unique.A.bool", "true"},
      {"shared.id", "B"}, {"shared.B.string", "s"},
  };
  std::unique_ptr<Configurable> configurable(new SimpleConfigurable());
  ASSERT_OK(configurable->ConfigureFromMap(config_options_, opt_map));
  SimpleOptions* simple = configurable->GetOptions<SimpleOptions>();
  ASSERT_NE(simple, nullptr);
  ASSERT_NE(simple->cu, nullptr);
  ASSERT_EQ(simple->cu->GetId(), "A");
  std::string opt_str;
  std::string mismatch;
  config_options_.delimiter = "\n";
  std::unordered_map<std::string, std::string> props;
  ASSERT_OK(configurable->GetOptionString(config_options_, &opt_str));
  GetMapFromProperties(opt_str, &props);
  std::unique_ptr<Configurable> copy(new SimpleConfigurable());
  ASSERT_OK(copy->ConfigureFromMap(config_options_, props));
  ASSERT_TRUE(
      configurable->AreEquivalent(config_options_, copy.get(), &mismatch));
}

TEST_F(CustomizableTest, ConfigureFromShortTest) {
  std::unordered_map<std::string, std::string> opt_map = {
      {"unique.id", "A"}, {"unique.A.int", "1"},    {"unique.A.bool", "true"},
      {"shared.id", "B"}, {"shared.B.string", "s"},
  };
  std::unique_ptr<Configurable> configurable(new SimpleConfigurable());
  ASSERT_OK(configurable->ConfigureFromMap(config_options_, opt_map));
  SimpleOptions* simple = configurable->GetOptions<SimpleOptions>();
  ASSERT_NE(simple, nullptr);
  ASSERT_NE(simple->cu, nullptr);
  ASSERT_EQ(simple->cu->GetId(), "A");
}

TEST_F(CustomizableTest, AreEquivalentOptionsTest) {
  std::unordered_map<std::string, std::string> opt_map = {
      {"unique", "id=A;int=1;bool=true"},
      {"shared", "id=A;int=1;bool=true"},
  };
  std::string mismatch;
  ConfigOptions config_options = config_options_;
  std::unique_ptr<Configurable> c1(new SimpleConfigurable());
  std::unique_ptr<Configurable> c2(new SimpleConfigurable());
  ASSERT_OK(c1->ConfigureFromMap(config_options, opt_map));
  ASSERT_OK(c2->ConfigureFromMap(config_options, opt_map));
  ASSERT_TRUE(c1->AreEquivalent(config_options, c2.get(), &mismatch));
  SimpleOptions* simple = c1->GetOptions<SimpleOptions>();
  ASSERT_TRUE(
      simple->cu->AreEquivalent(config_options, simple->cs.get(), &mismatch));
  ASSERT_OK(simple->cu->ConfigureOption(config_options, "int", "2"));
  ASSERT_FALSE(
      simple->cu->AreEquivalent(config_options, simple->cs.get(), &mismatch));
  ASSERT_FALSE(c1->AreEquivalent(config_options, c2.get(), &mismatch));
  ConfigOptions loosely = config_options;
  loosely.sanity_level = ConfigOptions::kSanityLevelLooselyCompatible;
  ASSERT_TRUE(c1->AreEquivalent(loosely, c2.get(), &mismatch));
  ASSERT_TRUE(simple->cu->AreEquivalent(loosely, simple->cs.get(), &mismatch));

  ASSERT_OK(c1->ConfigureOption(config_options, "shared", "id=B;string=3"));
  ASSERT_TRUE(c1->AreEquivalent(loosely, c2.get(), &mismatch));
  ASSERT_FALSE(c1->AreEquivalent(config_options, c2.get(), &mismatch));
  ASSERT_FALSE(simple->cs->AreEquivalent(loosely, simple->cu.get(), &mismatch));
  simple->cs.reset();
  ASSERT_TRUE(c1->AreEquivalent(loosely, c2.get(), &mismatch));
  ASSERT_FALSE(c1->AreEquivalent(config_options, c2.get(), &mismatch));
}

// Tests that we can initialize a customizable from its options
TEST_F(CustomizableTest, ConfigureStandaloneCustomTest) {
  std::unique_ptr<TestCustomizable> base, copy;
  const auto& registry = config_options_.registry;
  ASSERT_OK(registry->NewUniqueObject<TestCustomizable>("A", &base));
  ASSERT_OK(registry->NewUniqueObject<TestCustomizable>("A", &copy));
  ASSERT_OK(base->ConfigureFromString(config_options_, "int=33;bool=true"));
  std::string opt_str;
  std::string mismatch;
  ASSERT_OK(base->GetOptionString(config_options_, &opt_str));
  ASSERT_OK(copy->ConfigureFromString(config_options_, opt_str));
  ASSERT_TRUE(base->AreEquivalent(config_options_, copy.get(), &mismatch));
}

// Tests that we fail appropriately if the pattern is not registered
TEST_F(CustomizableTest, BadNameTest) {
  config_options_.ignore_unsupported_options = false;
  std::unique_ptr<Configurable> c1(new SimpleConfigurable());
  ASSERT_NOK(
      c1->ConfigureFromString(config_options_, "unique.shared.id=bad name"));
  config_options_.ignore_unsupported_options = true;
  ASSERT_OK(
      c1->ConfigureFromString(config_options_, "unique.shared.id=bad name"));
}

// Tests that we fail appropriately if a bad option is passed to the underlying
// configurable
TEST_F(CustomizableTest, BadOptionTest) {
  std::unique_ptr<Configurable> c1(new SimpleConfigurable());
  ConfigOptions ignore = config_options_;
  ignore.ignore_unknown_options = true;

  ASSERT_NOK(c1->ConfigureFromString(config_options_, "A.int=11"));
  ASSERT_NOK(c1->ConfigureFromString(config_options_, "shared={id=B;int=1}"));
  ASSERT_OK(c1->ConfigureFromString(ignore, "shared={id=A;string=s}"));
  ASSERT_NOK(c1->ConfigureFromString(config_options_, "B.int=11"));
  ASSERT_OK(c1->ConfigureFromString(ignore, "B.int=11"));
  ASSERT_NOK(c1->ConfigureFromString(config_options_, "A.string=s"));
  ASSERT_OK(c1->ConfigureFromString(ignore, "A.string=s"));
  // Test as detached
  ASSERT_NOK(
      c1->ConfigureFromString(config_options_, "shared.id=A;A.string=b}"));
  ASSERT_OK(c1->ConfigureFromString(ignore, "shared.id=A;A.string=s}"));
}

// Tests that different IDs lead to different objects
TEST_F(CustomizableTest, UniqueIdTest) {
  std::unique_ptr<Configurable> base(new SimpleConfigurable());
  ASSERT_OK(base->ConfigureFromString(config_options_,
                                      "unique={id=A_1;int=1;bool=true}"));
  SimpleOptions* simple = base->GetOptions<SimpleOptions>();
  ASSERT_NE(simple, nullptr);
  ASSERT_NE(simple->cu, nullptr);
  ASSERT_EQ(simple->cu->GetId(), std::string("A_1"));
  std::string opt_str;
  std::string mismatch;
  ASSERT_OK(base->GetOptionString(config_options_, &opt_str));
  std::unique_ptr<Configurable> copy(new SimpleConfigurable());
  ASSERT_OK(copy->ConfigureFromString(config_options_, opt_str));
  ASSERT_TRUE(base->AreEquivalent(config_options_, copy.get(), &mismatch));
  ASSERT_OK(base->ConfigureFromString(config_options_,
                                      "unique={id=A_2;int=1;bool=true}"));
  ASSERT_FALSE(base->AreEquivalent(config_options_, copy.get(), &mismatch));
  ASSERT_EQ(simple->cu->GetId(), std::string("A_2"));
}

TEST_F(CustomizableTest, IsInstanceOfTest) {
  std::shared_ptr<TestCustomizable> tc = std::make_shared<ACustomizable>("A_1");

  ASSERT_EQ(tc->GetId(), std::string("A_1"));
  ASSERT_TRUE(tc->IsInstanceOf("A"));
  ASSERT_TRUE(tc->IsInstanceOf("TestCustomizable"));
  ASSERT_FALSE(tc->IsInstanceOf("B"));
  ASSERT_FALSE(tc->IsInstanceOf("A_1"));
  ASSERT_EQ(tc->CheckedCast<ACustomizable>(), tc.get());
  ASSERT_EQ(tc->CheckedCast<TestCustomizable>(), tc.get());
  ASSERT_EQ(tc->CheckedCast<BCustomizable>(), nullptr);

  tc.reset(new BCustomizable("B"));
  ASSERT_TRUE(tc->IsInstanceOf("B"));
  ASSERT_TRUE(tc->IsInstanceOf("TestCustomizable"));
  ASSERT_FALSE(tc->IsInstanceOf("A"));
  ASSERT_EQ(tc->CheckedCast<BCustomizable>(), tc.get());
  ASSERT_EQ(tc->CheckedCast<TestCustomizable>(), tc.get());
  ASSERT_EQ(tc->CheckedCast<ACustomizable>(), nullptr);
}

TEST_F(CustomizableTest, PrepareOptionsTest) {
  static std::unordered_map<std::string, OptionTypeInfo> p_option_info = {
#ifndef ROCKSDB_LITE
      {"can_prepare",
       {0, OptionType::kBoolean, OptionVerificationType::kNormal,
        OptionTypeFlags::kNone}},
#endif  // ROCKSDB_LITE
  };

  class PrepareCustomizable : public TestCustomizable {
   public:
    bool can_prepare_ = true;

    PrepareCustomizable() : TestCustomizable("P") {
      RegisterOptions("Prepare", &can_prepare_, &p_option_info);
    }

    Status PrepareOptions(const ConfigOptions& opts) override {
      if (!can_prepare_) {
        return Status::InvalidArgument("Cannot Prepare");
      } else {
        return TestCustomizable::PrepareOptions(opts);
      }
    }
  };

  ObjectLibrary::Default()->AddFactory<TestCustomizable>(
      "P",
      [](const std::string& /*name*/, std::unique_ptr<TestCustomizable>* guard,
         std::string* /* msg */) {
        guard->reset(new PrepareCustomizable());
        return guard->get();
      });

  std::unique_ptr<Configurable> base(new SimpleConfigurable());
  ConfigOptions prepared(config_options_);
  prepared.invoke_prepare_options = true;

  ASSERT_OK(base->ConfigureFromString(
      prepared, "unique=A_1; shared={id=B;string=s}; pointer.id=S"));
  SimpleOptions* simple = base->GetOptions<SimpleOptions>();
  ASSERT_NE(simple, nullptr);
  ASSERT_NE(simple->cu, nullptr);
  ASSERT_NE(simple->cs, nullptr);
  ASSERT_NE(simple->cp, nullptr);
  delete simple->cp;
  base.reset(new SimpleConfigurable());
  ASSERT_OK(base->ConfigureFromString(
      config_options_, "unique=A_1; shared={id=B;string=s}; pointer.id=S"));

  simple = base->GetOptions<SimpleOptions>();
  ASSERT_NE(simple, nullptr);
  ASSERT_NE(simple->cu, nullptr);
  ASSERT_NE(simple->cs, nullptr);
  ASSERT_NE(simple->cp, nullptr);

  ASSERT_OK(base->PrepareOptions(config_options_));
  delete simple->cp;
  base.reset(new SimpleConfigurable());
  simple = base->GetOptions<SimpleOptions>();
  ASSERT_NE(simple, nullptr);

  ASSERT_NOK(
      base->ConfigureFromString(prepared, "unique={id=P; can_prepare=false}"));
  ASSERT_EQ(simple->cu, nullptr);

  ASSERT_OK(
      base->ConfigureFromString(prepared, "unique={id=P; can_prepare=true}"));
  ASSERT_NE(simple->cu, nullptr);

  ASSERT_OK(base->ConfigureFromString(config_options_,
                                      "unique={id=P; can_prepare=true}"));
  ASSERT_NE(simple->cu, nullptr);
  ASSERT_OK(simple->cu->PrepareOptions(prepared));

  ASSERT_OK(base->ConfigureFromString(config_options_,
                                      "unique={id=P; can_prepare=false}"));
  ASSERT_NE(simple->cu, nullptr);
  ASSERT_NOK(simple->cu->PrepareOptions(prepared));
}

namespace {
static std::unordered_map<std::string, OptionTypeInfo> inner_option_info = {
#ifndef ROCKSDB_LITE
    {"inner",
     OptionTypeInfo::AsCustomSharedPtr<TestCustomizable>(
         0, OptionVerificationType::kNormal, OptionTypeFlags::kStringNameOnly)}
#endif  // ROCKSDB_LITE
};

struct InnerOptions {
  static const char* kName() { return "InnerOptions"; }
  std::shared_ptr<Customizable> inner;
};

class InnerCustomizable : public Customizable {
 public:
  explicit InnerCustomizable(const std::shared_ptr<Customizable>& w) {
    iopts_.inner = w;
    RegisterOptions(&iopts_, &inner_option_info);
  }
  static const char* kClassName() { return "Inner"; }
  const char* Name() const override { return kClassName(); }

  bool IsInstanceOf(const std::string& name) const override {
    if (name == kClassName()) {
      return true;
    } else {
      return Customizable::IsInstanceOf(name);
    }
  }

 protected:
  const Customizable* Inner() const override { return iopts_.inner.get(); }

 private:
  InnerOptions iopts_;
};

struct WrappedOptions1 {
  static const char* kName() { return "WrappedOptions1"; }
  int i = 42;
};

class WrappedCustomizable1 : public InnerCustomizable {
 public:
  explicit WrappedCustomizable1(const std::shared_ptr<Customizable>& w)
      : InnerCustomizable(w) {
    RegisterOptions(&wopts_, nullptr);
  }
  const char* Name() const override { return kClassName(); }
  static const char* kClassName() { return "Wrapped1"; }

 private:
  WrappedOptions1 wopts_;
};

struct WrappedOptions2 {
  static const char* kName() { return "WrappedOptions2"; }
  std::string s = "42";
};
class WrappedCustomizable2 : public InnerCustomizable {
 public:
  explicit WrappedCustomizable2(const std::shared_ptr<Customizable>& w)
      : InnerCustomizable(w) {}
  const void* GetOptionsPtr(const std::string& name) const override {
    if (name == WrappedOptions2::kName()) {
      return &wopts_;
    } else {
      return InnerCustomizable::GetOptionsPtr(name);
    }
  }

  const char* Name() const override { return kClassName(); }
  static const char* kClassName() { return "Wrapped2"; }

 private:
  WrappedOptions2 wopts_;
};
}  // namespace

TEST_F(CustomizableTest, WrappedInnerTest) {
  std::shared_ptr<TestCustomizable> ac =
      std::make_shared<TestCustomizable>("A");

  ASSERT_TRUE(ac->IsInstanceOf("A"));
  ASSERT_TRUE(ac->IsInstanceOf("TestCustomizable"));
  ASSERT_EQ(ac->CheckedCast<TestCustomizable>(), ac.get());
  ASSERT_EQ(ac->CheckedCast<InnerCustomizable>(), nullptr);
  ASSERT_EQ(ac->CheckedCast<WrappedCustomizable1>(), nullptr);
  ASSERT_EQ(ac->CheckedCast<WrappedCustomizable2>(), nullptr);
  std::shared_ptr<Customizable> wc1 =
      std::make_shared<WrappedCustomizable1>(ac);

  ASSERT_TRUE(wc1->IsInstanceOf(WrappedCustomizable1::kClassName()));
  ASSERT_EQ(wc1->CheckedCast<WrappedCustomizable1>(), wc1.get());
  ASSERT_EQ(wc1->CheckedCast<WrappedCustomizable2>(), nullptr);
  ASSERT_EQ(wc1->CheckedCast<InnerCustomizable>(), wc1.get());
  ASSERT_EQ(wc1->CheckedCast<TestCustomizable>(), ac.get());

  std::shared_ptr<Customizable> wc2 =
      std::make_shared<WrappedCustomizable2>(wc1);
  ASSERT_TRUE(wc2->IsInstanceOf(WrappedCustomizable2::kClassName()));
  ASSERT_EQ(wc2->CheckedCast<WrappedCustomizable2>(), wc2.get());
  ASSERT_EQ(wc2->CheckedCast<WrappedCustomizable1>(), wc1.get());
  ASSERT_EQ(wc2->CheckedCast<InnerCustomizable>(), wc2.get());
  ASSERT_EQ(wc2->CheckedCast<TestCustomizable>(), ac.get());
}

TEST_F(CustomizableTest, CustomizableInnerTest) {
  std::shared_ptr<Customizable> c =
      std::make_shared<InnerCustomizable>(std::make_shared<ACustomizable>("a"));
  std::shared_ptr<Customizable> wc1 = std::make_shared<WrappedCustomizable1>(c);
  std::shared_ptr<Customizable> wc2 = std::make_shared<WrappedCustomizable2>(c);
  auto inner = c->GetOptions<InnerOptions>();
  ASSERT_NE(inner, nullptr);

  auto aopts = c->GetOptions<AOptions>();
  ASSERT_NE(aopts, nullptr);
  ASSERT_EQ(aopts, wc1->GetOptions<AOptions>());
  ASSERT_EQ(aopts, wc2->GetOptions<AOptions>());
  auto w1opts = wc1->GetOptions<WrappedOptions1>();
  ASSERT_NE(w1opts, nullptr);
  ASSERT_EQ(c->GetOptions<WrappedOptions1>(), nullptr);
  ASSERT_EQ(wc2->GetOptions<WrappedOptions1>(), nullptr);

  auto w2opts = wc2->GetOptions<WrappedOptions2>();
  ASSERT_NE(w2opts, nullptr);
  ASSERT_EQ(c->GetOptions<WrappedOptions2>(), nullptr);
  ASSERT_EQ(wc1->GetOptions<WrappedOptions2>(), nullptr);
}

TEST_F(CustomizableTest, CopyObjectTest) {
  class CopyCustomizable : public Customizable {
   public:
    CopyCustomizable() : prepared_(0), validated_(0) {}
    const char* Name() const override { return "CopyCustomizable"; }

    Status PrepareOptions(const ConfigOptions& options) override {
      prepared_++;
      return Customizable::PrepareOptions(options);
    }
    Status ValidateOptions(const DBOptions& db_opts,
                           const ColumnFamilyOptions& cf_opts) const override {
      validated_++;
      return Customizable::ValidateOptions(db_opts, cf_opts);
    }
    int prepared_;
    mutable int validated_;
  };

  CopyCustomizable c1;
  ConfigOptions config_options;
  Options options;

  ASSERT_OK(c1.PrepareOptions(config_options));
  ASSERT_OK(c1.ValidateOptions(options, options));
  ASSERT_EQ(c1.prepared_, 1);
  ASSERT_EQ(c1.validated_, 1);
  CopyCustomizable c2 = c1;
  ASSERT_OK(c1.PrepareOptions(config_options));
  ASSERT_OK(c1.ValidateOptions(options, options));
  ASSERT_EQ(c2.prepared_, 1);
  ASSERT_EQ(c2.validated_, 1);
  ASSERT_EQ(c1.prepared_, 2);
  ASSERT_EQ(c1.validated_, 2);
}

TEST_F(CustomizableTest, TestStringDepth) {
  ConfigOptions shallow = config_options_;
  std::unique_ptr<Configurable> c(
      new InnerCustomizable(std::make_shared<ACustomizable>("a")));
  std::string opt_str;
  shallow.depth = ConfigOptions::Depth::kDepthShallow;
  ASSERT_OK(c->GetOptionString(shallow, &opt_str));
  ASSERT_EQ(opt_str, "inner=a;");
  shallow.depth = ConfigOptions::Depth::kDepthDetailed;
  ASSERT_OK(c->GetOptionString(shallow, &opt_str));
  ASSERT_NE(opt_str, "inner=a;");
}

// Tests that we only get a new customizable when it changes
TEST_F(CustomizableTest, NewUniqueCustomizableTest) {
  std::unique_ptr<Configurable> base(new SimpleConfigurable());
  A_count = 0;
  ASSERT_OK(base->ConfigureFromString(config_options_,
                                      "unique={id=A_1;int=1;bool=true}"));
  SimpleOptions* simple = base->GetOptions<SimpleOptions>();
  ASSERT_NE(simple, nullptr);
  ASSERT_NE(simple->cu, nullptr);
  ASSERT_EQ(A_count, 1);  // Created one A
  ASSERT_OK(base->ConfigureFromString(config_options_,
                                      "unique={id=A_1;int=1;bool=false}"));
  ASSERT_EQ(A_count, 2);  // Create another A_1
  ASSERT_OK(base->ConfigureFromString(config_options_, "unique={id=}"));
  ASSERT_EQ(simple->cu, nullptr);
  ASSERT_EQ(A_count, 2);
  ASSERT_OK(base->ConfigureFromString(config_options_,
                                      "unique={id=A_2;int=1;bool=false}"));
  ASSERT_EQ(A_count, 3);  // Created another A
  ASSERT_OK(base->ConfigureFromString(config_options_, "unique.id="));
  ASSERT_EQ(simple->cu, nullptr);
  ASSERT_OK(base->ConfigureFromString(config_options_, "unique=nullptr"));
  ASSERT_EQ(simple->cu, nullptr);
  ASSERT_OK(base->ConfigureFromString(config_options_, "unique.id=nullptr"));
  ASSERT_EQ(simple->cu, nullptr);
  ASSERT_EQ(A_count, 3);
}

TEST_F(CustomizableTest, NewEmptyUniqueTest) {
  std::unique_ptr<Configurable> base(new SimpleConfigurable());
  SimpleOptions* simple = base->GetOptions<SimpleOptions>();
  ASSERT_EQ(simple->cu, nullptr);
  simple->cu.reset(new BCustomizable("B"));

  ASSERT_OK(base->ConfigureFromString(config_options_, "unique={id=}"));
  ASSERT_EQ(simple->cu, nullptr);
  simple->cu.reset(new BCustomizable("B"));

  ASSERT_OK(base->ConfigureFromString(config_options_, "unique={id=nullptr}"));
  ASSERT_EQ(simple->cu, nullptr);
  simple->cu.reset(new BCustomizable("B"));

  ASSERT_OK(base->ConfigureFromString(config_options_, "unique.id="));
  ASSERT_EQ(simple->cu, nullptr);
  simple->cu.reset(new BCustomizable("B"));

  ASSERT_OK(base->ConfigureFromString(config_options_, "unique=nullptr"));
  ASSERT_EQ(simple->cu, nullptr);
  simple->cu.reset(new BCustomizable("B"));

  ASSERT_OK(base->ConfigureFromString(config_options_, "unique.id=nullptr"));
  ASSERT_EQ(simple->cu, nullptr);
}

TEST_F(CustomizableTest, NewEmptySharedTest) {
  std::unique_ptr<Configurable> base(new SimpleConfigurable());

  SimpleOptions* simple = base->GetOptions<SimpleOptions>();
  ASSERT_NE(simple, nullptr);
  ASSERT_EQ(simple->cs, nullptr);
  simple->cs.reset(new BCustomizable("B"));

  ASSERT_OK(base->ConfigureFromString(config_options_, "shared={id=}"));
  ASSERT_NE(simple, nullptr);
  ASSERT_EQ(simple->cs, nullptr);
  simple->cs.reset(new BCustomizable("B"));

  ASSERT_OK(base->ConfigureFromString(config_options_, "shared={id=nullptr}"));
  ASSERT_EQ(simple->cs, nullptr);
  simple->cs.reset(new BCustomizable("B"));

  ASSERT_OK(base->ConfigureFromString(config_options_, "shared.id="));
  ASSERT_EQ(simple->cs, nullptr);
  simple->cs.reset(new BCustomizable("B"));

  ASSERT_OK(base->ConfigureFromString(config_options_, "shared.id=nullptr"));
  ASSERT_EQ(simple->cs, nullptr);
  simple->cs.reset(new BCustomizable("B"));

  ASSERT_OK(base->ConfigureFromString(config_options_, "shared=nullptr"));
  ASSERT_EQ(simple->cs, nullptr);
}

TEST_F(CustomizableTest, NewEmptyStaticTest) {
  std::unique_ptr<Configurable> base(new SimpleConfigurable());
  ASSERT_OK(base->ConfigureFromString(config_options_, "pointer={id=}"));
  SimpleOptions* simple = base->GetOptions<SimpleOptions>();
  ASSERT_NE(simple, nullptr);
  ASSERT_EQ(simple->cp, nullptr);
  ASSERT_OK(base->ConfigureFromString(config_options_, "pointer={id=nullptr}"));
  ASSERT_EQ(simple->cp, nullptr);

  ASSERT_OK(base->ConfigureFromString(config_options_, "pointer="));
  ASSERT_EQ(simple->cp, nullptr);
  ASSERT_OK(base->ConfigureFromString(config_options_, "pointer=nullptr"));
  ASSERT_EQ(simple->cp, nullptr);

  ASSERT_OK(base->ConfigureFromString(config_options_, "pointer.id="));
  ASSERT_EQ(simple->cp, nullptr);
  ASSERT_OK(base->ConfigureFromString(config_options_, "pointer.id=nullptr"));
  ASSERT_EQ(simple->cp, nullptr);
}

namespace {
#ifndef ROCKSDB_LITE
static std::unordered_map<std::string, OptionTypeInfo> vector_option_info = {
    {"vector",
     OptionTypeInfo::Vector<std::shared_ptr<TestCustomizable>>(
         0, OptionVerificationType::kNormal,

         OptionTypeFlags::kNone,

         OptionTypeInfo::AsCustomSharedPtr<TestCustomizable>(
             0, OptionVerificationType::kNormal, OptionTypeFlags::kNone))},
};
class VectorConfigurable : public SimpleConfigurable {
 public:
  VectorConfigurable() { RegisterOptions("vector", &cv, &vector_option_info); }
  std::vector<std::shared_ptr<TestCustomizable>> cv;
};
}  // namespace

TEST_F(CustomizableTest, VectorConfigTest) {
  VectorConfigurable orig, copy;
  std::shared_ptr<TestCustomizable> c1, c2;
  ASSERT_OK(TestCustomizable::CreateFromString(config_options_, "A", &c1));
  ASSERT_OK(TestCustomizable::CreateFromString(config_options_, "B", &c2));
  orig.cv.push_back(c1);
  orig.cv.push_back(c2);
  ASSERT_OK(orig.ConfigureFromString(config_options_, "unique=A2"));
  std::string opt_str, mismatch;
  ASSERT_OK(orig.GetOptionString(config_options_, &opt_str));
  ASSERT_OK(copy.ConfigureFromString(config_options_, opt_str));
  ASSERT_TRUE(orig.AreEquivalent(config_options_, &copy, &mismatch));
}

TEST_F(CustomizableTest, NoNameTest) {
  // If Customizables are created without names, they are not
  // part of the serialization (since they cannot be recreated)
  VectorConfigurable orig, copy;
  auto sopts = orig.GetOptions<SimpleOptions>();
  auto copts = copy.GetOptions<SimpleOptions>();
  sopts->cu.reset(new ACustomizable(""));
  orig.cv.push_back(std::make_shared<ACustomizable>(""));
  orig.cv.push_back(std::make_shared<ACustomizable>("A_1"));
  std::string opt_str, mismatch;
  ASSERT_OK(orig.GetOptionString(config_options_, &opt_str));
  ASSERT_OK(copy.ConfigureFromString(config_options_, opt_str));
  ASSERT_EQ(copy.cv.size(), 1U);
  ASSERT_EQ(copy.cv[0]->GetId(), "A_1");
  ASSERT_EQ(copts->cu, nullptr);
}

#endif  // ROCKSDB_LITE

TEST_F(CustomizableTest, IgnoreUnknownObjects) {
  ConfigOptions ignore = config_options_;
  std::shared_ptr<TestCustomizable> shared;
  std::unique_ptr<TestCustomizable> unique;
  TestCustomizable* pointer = nullptr;
  ignore.ignore_unsupported_options = false;
  ASSERT_NOK(
      LoadSharedObject<TestCustomizable>(ignore, "Unknown", nullptr, &shared));
  ASSERT_NOK(
      LoadUniqueObject<TestCustomizable>(ignore, "Unknown", nullptr, &unique));
  ASSERT_NOK(
      LoadStaticObject<TestCustomizable>(ignore, "Unknown", nullptr, &pointer));
  ASSERT_EQ(shared.get(), nullptr);
  ASSERT_EQ(unique.get(), nullptr);
  ASSERT_EQ(pointer, nullptr);
  ignore.ignore_unsupported_options = true;
  ASSERT_OK(
      LoadSharedObject<TestCustomizable>(ignore, "Unknown", nullptr, &shared));
  ASSERT_OK(
      LoadUniqueObject<TestCustomizable>(ignore, "Unknown", nullptr, &unique));
  ASSERT_OK(
      LoadStaticObject<TestCustomizable>(ignore, "Unknown", nullptr, &pointer));
  ASSERT_EQ(shared.get(), nullptr);
  ASSERT_EQ(unique.get(), nullptr);
  ASSERT_EQ(pointer, nullptr);
  ASSERT_OK(LoadSharedObject<TestCustomizable>(ignore, "id=Unknown", nullptr,
                                               &shared));
  ASSERT_OK(LoadUniqueObject<TestCustomizable>(ignore, "id=Unknown", nullptr,
                                               &unique));
  ASSERT_OK(LoadStaticObject<TestCustomizable>(ignore, "id=Unknown", nullptr,
                                               &pointer));
  ASSERT_EQ(shared.get(), nullptr);
  ASSERT_EQ(unique.get(), nullptr);
  ASSERT_EQ(pointer, nullptr);
  ASSERT_OK(LoadSharedObject<TestCustomizable>(ignore, "id=Unknown;option=bad",
                                               nullptr, &shared));
  ASSERT_OK(LoadUniqueObject<TestCustomizable>(ignore, "id=Unknown;option=bad",
                                               nullptr, &unique));
  ASSERT_OK(LoadStaticObject<TestCustomizable>(ignore, "id=Unknown;option=bad",
                                               nullptr, &pointer));
  ASSERT_EQ(shared.get(), nullptr);
  ASSERT_EQ(unique.get(), nullptr);
  ASSERT_EQ(pointer, nullptr);
}

TEST_F(CustomizableTest, FactoryFunctionTest) {
  std::shared_ptr<TestCustomizable> shared;
  std::unique_ptr<TestCustomizable> unique;
  TestCustomizable* pointer = nullptr;
  ConfigOptions ignore = config_options_;
  ignore.ignore_unsupported_options = false;
  ASSERT_OK(TestCustomizable::CreateFromString(ignore, "B", &shared));
  ASSERT_OK(TestCustomizable::CreateFromString(ignore, "B", &unique));
  ASSERT_OK(TestCustomizable::CreateFromString(ignore, "B", &pointer));
  ASSERT_NE(shared.get(), nullptr);
  ASSERT_NE(unique.get(), nullptr);
  ASSERT_NE(pointer, nullptr);
  delete pointer;
  pointer = nullptr;
  ASSERT_OK(TestCustomizable::CreateFromString(ignore, "id=", &shared));
  ASSERT_OK(TestCustomizable::CreateFromString(ignore, "id=", &unique));
  ASSERT_OK(TestCustomizable::CreateFromString(ignore, "id=", &pointer));
  ASSERT_EQ(shared.get(), nullptr);
  ASSERT_EQ(unique.get(), nullptr);
  ASSERT_EQ(pointer, nullptr);
  ASSERT_NOK(TestCustomizable::CreateFromString(ignore, "option=bad", &shared));
  ASSERT_NOK(TestCustomizable::CreateFromString(ignore, "option=bad", &unique));
  ASSERT_NOK(
      TestCustomizable::CreateFromString(ignore, "option=bad", &pointer));
  ASSERT_EQ(pointer, nullptr);
}

TEST_F(CustomizableTest, URLFactoryTest) {
  std::unique_ptr<TestCustomizable> unique;
  config_options_.registry->AddLibrary("URL")->AddFactory<TestCustomizable>(
      ObjectLibrary::PatternEntry("Z", false).AddSeparator(""),
      [](const std::string& name, std::unique_ptr<TestCustomizable>* guard,
         std::string* /* msg */) {
        guard->reset(new TestCustomizable(name));
        return guard->get();
      });

  ConfigOptions ignore = config_options_;
  ignore.ignore_unsupported_options = false;
  ignore.ignore_unsupported_options = false;
  ASSERT_OK(TestCustomizable::CreateFromString(ignore, "Z=1;x=y", &unique));
  ASSERT_NE(unique, nullptr);
  ASSERT_EQ(unique->GetId(), "Z=1;x=y");
  ASSERT_OK(TestCustomizable::CreateFromString(ignore, "Z;x=y", &unique));
  ASSERT_NE(unique, nullptr);
  ASSERT_EQ(unique->GetId(), "Z;x=y");
  unique.reset();
  ASSERT_OK(TestCustomizable::CreateFromString(ignore, "Z=1?x=y", &unique));
  ASSERT_NE(unique, nullptr);
  ASSERT_EQ(unique->GetId(), "Z=1?x=y");
}

TEST_F(CustomizableTest, MutableOptionsTest) {
  static std::unordered_map<std::string, OptionTypeInfo> mutable_option_info = {
      {"mutable",
       OptionTypeInfo::AsCustomSharedPtr<TestCustomizable>(
           0, OptionVerificationType::kNormal, OptionTypeFlags::kMutable)}};
  static std::unordered_map<std::string, OptionTypeInfo> immutable_option_info =
      {{"immutable",
        OptionTypeInfo::AsCustomSharedPtr<TestCustomizable>(
            0, OptionVerificationType::kNormal, OptionTypeFlags::kAllowNull)}};

  class MutableCustomizable : public Customizable {
   private:
    std::shared_ptr<TestCustomizable> mutable_;
    std::shared_ptr<TestCustomizable> immutable_;

   public:
    MutableCustomizable() {
      RegisterOptions("mutable", &mutable_, &mutable_option_info);
      RegisterOptions("immutable", &immutable_, &immutable_option_info);
    }
    const char* Name() const override { return "MutableCustomizable"; }
  };
  MutableCustomizable mc, mc2;
  std::string mismatch;
  std::string opt_str;

  ConfigOptions options = config_options_;
  ASSERT_OK(mc.ConfigureOption(options, "mutable", "{id=B;}"));
  options.mutable_options_only = true;
  ASSERT_OK(mc.GetOptionString(options, &opt_str));
  ASSERT_OK(mc2.ConfigureFromString(options, opt_str));
  ASSERT_TRUE(mc.AreEquivalent(options, &mc2, &mismatch));

  options.mutable_options_only = false;
  ASSERT_OK(mc.ConfigureOption(options, "immutable", "{id=A; int=10}"));
  auto* mm = mc.GetOptions<std::shared_ptr<TestCustomizable>>("mutable");
  auto* im = mc.GetOptions<std::shared_ptr<TestCustomizable>>("immutable");
  ASSERT_NE(mm, nullptr);
  ASSERT_NE(mm->get(), nullptr);
  ASSERT_NE(im, nullptr);
  ASSERT_NE(im->get(), nullptr);

  // Now only deal with mutable options
  options.mutable_options_only = true;

  // Setting nested immutable customizable options fails
  ASSERT_NOK(mc.ConfigureOption(options, "immutable", "{id=B;}"));
  ASSERT_NOK(mc.ConfigureOption(options, "immutable.id", "B"));
  ASSERT_NOK(mc.ConfigureOption(options, "immutable.bool", "true"));
  ASSERT_NOK(mc.ConfigureOption(options, "immutable", "bool=true"));
  ASSERT_NOK(mc.ConfigureOption(options, "immutable", "{int=11;bool=true}"));
  auto* im_a = im->get()->GetOptions<AOptions>("A");
  ASSERT_NE(im_a, nullptr);
  ASSERT_EQ(im_a->i, 10);
  ASSERT_EQ(im_a->b, false);

  // Setting nested mutable customizable options succeeds but the object did not
  // change
  ASSERT_OK(mc.ConfigureOption(options, "immutable.int", "11"));
  ASSERT_EQ(im_a->i, 11);
  ASSERT_EQ(im_a, im->get()->GetOptions<AOptions>("A"));

  // The mutable configurable itself can be changed
  ASSERT_OK(mc.ConfigureOption(options, "mutable.id", "A"));
  ASSERT_OK(mc.ConfigureOption(options, "mutable", "A"));
  ASSERT_OK(mc.ConfigureOption(options, "mutable", "{id=A}"));
  ASSERT_OK(mc.ConfigureOption(options, "mutable", "{bool=true}"));

  // The Nested options in the mutable object can be changed
  ASSERT_OK(mc.ConfigureOption(options, "mutable", "{bool=true}"));
  auto* mm_a = mm->get()->GetOptions<AOptions>("A");
  ASSERT_EQ(mm_a->b, true);
  ASSERT_OK(mc.ConfigureOption(options, "mutable", "{int=22;bool=false}"));
  mm_a = mm->get()->GetOptions<AOptions>("A");
  ASSERT_EQ(mm_a->i, 22);
  ASSERT_EQ(mm_a->b, false);

  // Only the mutable options should get serialized
  options.mutable_options_only = false;
  ASSERT_OK(mc.GetOptionString(options, &opt_str));
  ASSERT_OK(mc.ConfigureOption(options, "immutable", "{id=B;}"));
  options.mutable_options_only = true;

  ASSERT_OK(mc.GetOptionString(options, &opt_str));
  ASSERT_OK(mc2.ConfigureFromString(options, opt_str));
  ASSERT_TRUE(mc.AreEquivalent(options, &mc2, &mismatch));
  options.mutable_options_only = false;
  ASSERT_FALSE(mc.AreEquivalent(options, &mc2, &mismatch));
  ASSERT_EQ(mismatch, "immutable");
}

TEST_F(CustomizableTest, CustomManagedObjects) {
  std::shared_ptr<TestCustomizable> object1, object2;
  ASSERT_OK(LoadManagedObject<TestCustomizable>(
      config_options_, "id=A_1;int=1;bool=true", &object1));
  ASSERT_NE(object1, nullptr);
  ASSERT_OK(
      LoadManagedObject<TestCustomizable>(config_options_, "A_1", &object2));
  ASSERT_EQ(object1, object2);
  auto* opts = object2->GetOptions<AOptions>("A");
  ASSERT_NE(opts, nullptr);
  ASSERT_EQ(opts->i, 1);
  ASSERT_EQ(opts->b, true);
  ASSERT_OK(
      LoadManagedObject<TestCustomizable>(config_options_, "A_2", &object2));
  ASSERT_NE(object1, object2);
  object1.reset();
  ASSERT_OK(LoadManagedObject<TestCustomizable>(
      config_options_, "id=A_1;int=2;bool=false", &object1));
  opts = object1->GetOptions<AOptions>("A");
  ASSERT_NE(opts, nullptr);
  ASSERT_EQ(opts->i, 2);
  ASSERT_EQ(opts->b, false);
}

TEST_F(CustomizableTest, CreateManagedObjects) {
  class ManagedCustomizable : public Customizable {
   public:
    static const char* Type() { return "ManagedCustomizable"; }
    static const char* kClassName() { return "Managed"; }
    const char* Name() const override { return kClassName(); }
    std::string GetId() const override { return id_; }
    ManagedCustomizable() { id_ = GenerateIndividualId(); }
    static Status CreateFromString(
        const ConfigOptions& opts, const std::string& value,
        std::shared_ptr<ManagedCustomizable>* result) {
      return LoadManagedObject<ManagedCustomizable>(opts, value, result);
    }

   private:
    std::string id_;
  };

  config_options_.registry->AddLibrary("Managed")
      ->AddFactory<ManagedCustomizable>(
          ObjectLibrary::PatternEntry::AsIndividualId(
              ManagedCustomizable::kClassName()),
          [](const std::string& /*name*/,
             std::unique_ptr<ManagedCustomizable>* guard,
             std::string* /* msg */) {
            guard->reset(new ManagedCustomizable());
            return guard->get();
          });

  std::shared_ptr<ManagedCustomizable> mc1, mc2, mc3, obj;
  // Create a "deadbeef" customizable
  std::string deadbeef =
      std::string(ManagedCustomizable::kClassName()) + "@0xdeadbeef#0001";
  ASSERT_OK(
      ManagedCustomizable::CreateFromString(config_options_, deadbeef, &mc1));
  // Create an object with the base/class name
  ASSERT_OK(ManagedCustomizable::CreateFromString(
      config_options_, ManagedCustomizable::kClassName(), &mc2));
  // Creating another with the base name returns a different object
  ASSERT_OK(ManagedCustomizable::CreateFromString(
      config_options_, ManagedCustomizable::kClassName(), &mc3));
  // At this point, there should be 4 managed objects (deadbeef, mc1, 2, and 3)
  std::vector<std::shared_ptr<ManagedCustomizable>> objects;
  ASSERT_OK(config_options_.registry->ListManagedObjects(&objects));
  ASSERT_EQ(objects.size(), 4U);
  objects.clear();
  // Three separate object, none of them equal
  ASSERT_NE(mc1, mc2);
  ASSERT_NE(mc1, mc3);
  ASSERT_NE(mc2, mc3);

  // Creating another object with "deadbeef" object
  ASSERT_OK(
      ManagedCustomizable::CreateFromString(config_options_, deadbeef, &obj));
  ASSERT_EQ(mc1, obj);
  // Create another with the IDs of the instances
  ASSERT_OK(ManagedCustomizable::CreateFromString(config_options_, mc1->GetId(),
                                                  &obj));
  ASSERT_EQ(mc1, obj);
  ASSERT_OK(ManagedCustomizable::CreateFromString(config_options_, mc2->GetId(),
                                                  &obj));
  ASSERT_EQ(mc2, obj);
  ASSERT_OK(ManagedCustomizable::CreateFromString(config_options_, mc3->GetId(),
                                                  &obj));
  ASSERT_EQ(mc3, obj);

  // Now get rid of deadbeef.  2 Objects left (m2+m3)
  mc1.reset();
  ASSERT_EQ(
      config_options_.registry->GetManagedObject<ManagedCustomizable>(deadbeef),
      nullptr);
  ASSERT_OK(config_options_.registry->ListManagedObjects(&objects));
  ASSERT_EQ(objects.size(), 2U);
  objects.clear();

  // Associate deadbeef with #2
  ASSERT_OK(config_options_.registry->SetManagedObject(deadbeef, mc2));
  ASSERT_OK(
      ManagedCustomizable::CreateFromString(config_options_, deadbeef, &obj));
  ASSERT_EQ(mc2, obj);
  obj.reset();

  // Get the ID of mc2 and then reset it.  1 Object left
  std::string mc2id = mc2->GetId();
  mc2.reset();
  ASSERT_EQ(
      config_options_.registry->GetManagedObject<ManagedCustomizable>(mc2id),
      nullptr);
  ASSERT_OK(config_options_.registry->ListManagedObjects(&objects));
  ASSERT_EQ(objects.size(), 1U);
  objects.clear();

  // Create another object with the old mc2id.
  ASSERT_OK(
      ManagedCustomizable::CreateFromString(config_options_, mc2id, &mc2));
  ASSERT_OK(
      ManagedCustomizable::CreateFromString(config_options_, mc2id, &obj));
  ASSERT_EQ(mc2, obj);

  // For good measure, create another deadbeef object
  ASSERT_OK(
      ManagedCustomizable::CreateFromString(config_options_, deadbeef, &mc1));
  ASSERT_OK(
      ManagedCustomizable::CreateFromString(config_options_, deadbeef, &obj));
  ASSERT_EQ(mc1, obj);
}

#endif  // !ROCKSDB_LITE

namespace {
class TestSecondaryCache : public SecondaryCache {
 public:
  static const char* kClassName() { return "Test"; }
  const char* Name() const override { return kClassName(); }
  Status Insert(const Slice& /*key*/, void* /*value*/,
                const Cache::CacheItemHelper* /*helper*/) override {
    return Status::NotSupported();
  }
  std::unique_ptr<SecondaryCacheResultHandle> Lookup(
      const Slice& /*key*/, const Cache::CreateCallback& /*create_cb*/,
      bool /*wait*/) override {
    return nullptr;
  }
  void Erase(const Slice& /*key*/) override {}

  // Wait for a collection of handles to become ready
  void WaitAll(std::vector<SecondaryCacheResultHandle*> /*handles*/) override {}

  std::string GetPrintableOptions() const override { return ""; }
};

class TestStatistics : public StatisticsImpl {
 public:
  TestStatistics() : StatisticsImpl(nullptr) {}
  const char* Name() const override { return kClassName(); }
  static const char* kClassName() { return "Test"; }
};

class TestFlushBlockPolicyFactory : public FlushBlockPolicyFactory {
 public:
  TestFlushBlockPolicyFactory() {}

  static const char* kClassName() { return "TestFlushBlockPolicyFactory"; }
  const char* Name() const override { return kClassName(); }

  FlushBlockPolicy* NewFlushBlockPolicy(
      const BlockBasedTableOptions& /*table_options*/,
      const BlockBuilder& /*data_block_builder*/) const override {
    return nullptr;
  }
};

class MockSliceTransform : public SliceTransform {
 public:
  const char* Name() const override { return kClassName(); }
  static const char* kClassName() { return "Mock"; }

  Slice Transform(const Slice& /*key*/) const override { return Slice(); }

  bool InDomain(const Slice& /*key*/) const override { return false; }

  bool InRange(const Slice& /*key*/) const override { return false; }
};

class MockMemoryAllocator : public BaseMemoryAllocator {
 public:
  static const char* kClassName() { return "MockMemoryAllocator"; }
  const char* Name() const override { return kClassName(); }
};

#ifndef ROCKSDB_LITE
class MockEncryptionProvider : public EncryptionProvider {
 public:
  explicit MockEncryptionProvider(const std::string& id) : id_(id) {}
  static const char* kClassName() { return "Mock"; }
  const char* Name() const override { return kClassName(); }
  size_t GetPrefixLength() const override { return 0; }
  Status CreateNewPrefix(const std::string& /*fname*/, char* /*prefix*/,
                         size_t /*prefixLength*/) const override {
    return Status::NotSupported();
  }

  Status AddCipher(const std::string& /*descriptor*/, const char* /*cipher*/,
                   size_t /*len*/, bool /*for_write*/) override {
    return Status::NotSupported();
  }

  Status CreateCipherStream(
      const std::string& /*fname*/, const EnvOptions& /*options*/,
      Slice& /*prefix*/,
      std::unique_ptr<BlockAccessCipherStream>* /*result*/) override {
    return Status::NotSupported();
  }
  Status ValidateOptions(const DBOptions& db_opts,
                         const ColumnFamilyOptions& cf_opts) const override {
    if (EndsWith(id_, "://test")) {
      return EncryptionProvider::ValidateOptions(db_opts, cf_opts);
    } else {
      return Status::InvalidArgument("MockProvider not initialized");
    }
  }

 private:
  std::string id_;
};

class MockCipher : public BlockCipher {
 public:
  const char* Name() const override { return "Mock"; }
  size_t BlockSize() override { return 0; }
  Status Encrypt(char* /*data*/) override { return Status::NotSupported(); }
  Status Decrypt(char* data) override { return Encrypt(data); }
};
#endif  // ROCKSDB_LITE

class DummyFileSystem : public FileSystemWrapper {
 public:
  explicit DummyFileSystem(const std::shared_ptr<FileSystem>& t)
      : FileSystemWrapper(t) {}
  static const char* kClassName() { return "DummyFileSystem"; }
  const char* Name() const override { return kClassName(); }
};

#ifndef ROCKSDB_LITE

#endif  // ROCKSDB_LITE

class MockTablePropertiesCollectorFactory
    : public TablePropertiesCollectorFactory {
 private:
 public:
  TablePropertiesCollector* CreateTablePropertiesCollector(
      TablePropertiesCollectorFactory::Context /*context*/) override {
    return nullptr;
  }
  static const char* kClassName() { return "Mock"; }
  const char* Name() const override { return kClassName(); }
};

class MockSstPartitionerFactory : public SstPartitionerFactory {
 public:
  static const char* kClassName() { return "Mock"; }
  const char* Name() const override { return kClassName(); }
  std::unique_ptr<SstPartitioner> CreatePartitioner(
      const SstPartitioner::Context& /* context */) const override {
    return nullptr;
  }
};

class MockFileChecksumGenFactory : public FileChecksumGenFactory {
 public:
  static const char* kClassName() { return "Mock"; }
  const char* Name() const override { return kClassName(); }
  std::unique_ptr<FileChecksumGenerator> CreateFileChecksumGenerator(
      const FileChecksumGenContext& /*context*/) override {
    return nullptr;
  }
};

class MockRateLimiter : public RateLimiter {
 public:
  static const char* kClassName() { return "MockRateLimiter"; }
  const char* Name() const override { return kClassName(); }
  void SetBytesPerSecond(int64_t /*bytes_per_second*/) override {}
  int64_t GetBytesPerSecond() const override { return 0; }
  int64_t GetSingleBurstBytes() const override { return 0; }
  int64_t GetTotalBytesThrough(const Env::IOPriority /*pri*/) const override {
    return 0;
  }
  int64_t GetTotalRequests(const Env::IOPriority /*pri*/) const override {
    return 0;
  }
};

#ifndef ROCKSDB_LITE
static int RegisterLocalObjects(ObjectLibrary& library,
                                const std::string& /*arg*/) {
  size_t num_types;
  library.AddFactory<TableFactory>(
      mock::MockTableFactory::kClassName(),
      [](const std::string& /*uri*/, std::unique_ptr<TableFactory>* guard,
         std::string* /* errmsg */) {
        guard->reset(new mock::MockTableFactory());
        return guard->get();
      });
  library.AddFactory<EventListener>(
      OnFileDeletionListener::kClassName(),
      [](const std::string& /*uri*/, std::unique_ptr<EventListener>* guard,
         std::string* /* errmsg */) {
        guard->reset(new OnFileDeletionListener());
        return guard->get();
      });
  library.AddFactory<EventListener>(
      FlushCounterListener::kClassName(),
      [](const std::string& /*uri*/, std::unique_ptr<EventListener>* guard,
         std::string* /* errmsg */) {
        guard->reset(new FlushCounterListener());
        return guard->get();
      });
  // Load any locally defined objects here
  library.AddFactory<const SliceTransform>(
      MockSliceTransform::kClassName(),
      [](const std::string& /*uri*/,
         std::unique_ptr<const SliceTransform>* guard,
         std::string* /* errmsg */) {
        guard->reset(new MockSliceTransform());
        return guard->get();
      });
  library.AddFactory<Statistics>(
      TestStatistics::kClassName(),
      [](const std::string& /*uri*/, std::unique_ptr<Statistics>* guard,
         std::string* /* errmsg */) {
        guard->reset(new TestStatistics());
        return guard->get();
      });

  library.AddFactory<EncryptionProvider>(
      ObjectLibrary::PatternEntry(MockEncryptionProvider::kClassName(), true)
          .AddSuffix("://test"),
      [](const std::string& uri, std::unique_ptr<EncryptionProvider>* guard,
         std::string* /* errmsg */) {
        guard->reset(new MockEncryptionProvider(uri));
        return guard->get();
      });
  library.AddFactory<BlockCipher>(
      "Mock",
      [](const std::string& /*uri*/, std::unique_ptr<BlockCipher>* guard,
         std::string* /* errmsg */) {
        guard->reset(new MockCipher());
        return guard->get();
      });
  library.AddFactory<MemoryAllocator>(
      MockMemoryAllocator::kClassName(),
      [](const std::string& /*uri*/, std::unique_ptr<MemoryAllocator>* guard,
         std::string* /* errmsg */) {
        guard->reset(new MockMemoryAllocator());
        return guard->get();
      });
  library.AddFactory<FlushBlockPolicyFactory>(
      TestFlushBlockPolicyFactory::kClassName(),
      [](const std::string& /*uri*/,
         std::unique_ptr<FlushBlockPolicyFactory>* guard,
         std::string* /* errmsg */) {
        guard->reset(new TestFlushBlockPolicyFactory());
        return guard->get();
      });

  library.AddFactory<SecondaryCache>(
      TestSecondaryCache::kClassName(),
      [](const std::string& /*uri*/, std::unique_ptr<SecondaryCache>* guard,
         std::string* /* errmsg */) {
        guard->reset(new TestSecondaryCache());
        return guard->get();
      });

  library.AddFactory<FileSystem>(
      DummyFileSystem::kClassName(),
      [](const std::string& /*uri*/, std::unique_ptr<FileSystem>* guard,
         std::string* /* errmsg */) {
        guard->reset(new DummyFileSystem(nullptr));
        return guard->get();
      });

  library.AddFactory<SstPartitionerFactory>(
      MockSstPartitionerFactory::kClassName(),
      [](const std::string& /*uri*/,
         std::unique_ptr<SstPartitionerFactory>* guard,
         std::string* /* errmsg */) {
        guard->reset(new MockSstPartitionerFactory());
        return guard->get();
      });

  library.AddFactory<FileChecksumGenFactory>(
      MockFileChecksumGenFactory::kClassName(),
      [](const std::string& /*uri*/,
         std::unique_ptr<FileChecksumGenFactory>* guard,
         std::string* /* errmsg */) {
        guard->reset(new MockFileChecksumGenFactory());
        return guard->get();
      });

  library.AddFactory<TablePropertiesCollectorFactory>(
      MockTablePropertiesCollectorFactory::kClassName(),
      [](const std::string& /*uri*/,
         std::unique_ptr<TablePropertiesCollectorFactory>* guard,
         std::string* /* errmsg */) {
        guard->reset(new MockTablePropertiesCollectorFactory());
        return guard->get();
      });

  library.AddFactory<RateLimiter>(
      MockRateLimiter::kClassName(),
      [](const std::string& /*uri*/, std::unique_ptr<RateLimiter>* guard,
         std::string* /* errmsg */) {
        guard->reset(new MockRateLimiter());
        return guard->get();
      });

  return static_cast<int>(library.GetFactoryCount(&num_types));
}
#endif  // !ROCKSDB_LITE
}  // namespace

class LoadCustomizableTest : public testing::Test {
 public:
  LoadCustomizableTest() {
    config_options_.ignore_unsupported_options = false;
    config_options_.invoke_prepare_options = false;
  }
  bool RegisterTests(const std::string& arg) {
#ifndef ROCKSDB_LITE
    config_options_.registry->AddLibrary("custom-tests",
                                         test::RegisterTestObjects, arg);
    config_options_.registry->AddLibrary("local-tests", RegisterLocalObjects,
                                         arg);
    return true;
#else
    (void)arg;
    return false;
#endif  // !ROCKSDB_LITE
  }

 protected:
  DBOptions db_opts_;
  ColumnFamilyOptions cf_opts_;
  ConfigOptions config_options_;
};

TEST_F(LoadCustomizableTest, LoadTableFactoryTest) {
  std::shared_ptr<TableFactory> factory;
  ASSERT_NOK(TableFactory::CreateFromString(
      config_options_, mock::MockTableFactory::kClassName(), &factory));
  ASSERT_OK(TableFactory::CreateFromString(
      config_options_, TableFactory::kBlockBasedTableName(), &factory));
  ASSERT_NE(factory, nullptr);
  ASSERT_STREQ(factory->Name(), TableFactory::kBlockBasedTableName());
#ifndef ROCKSDB_LITE
  std::string opts_str = "table_factory=";
  ASSERT_OK(GetColumnFamilyOptionsFromString(
      config_options_, cf_opts_,
      opts_str + TableFactory::kBlockBasedTableName(), &cf_opts_));
  ASSERT_NE(cf_opts_.table_factory.get(), nullptr);
  ASSERT_STREQ(cf_opts_.table_factory->Name(),
               TableFactory::kBlockBasedTableName());
#endif  // ROCKSDB_LITE
  if (RegisterTests("Test")) {
    ASSERT_OK(TableFactory::CreateFromString(
        config_options_, mock::MockTableFactory::kClassName(), &factory));
    ASSERT_NE(factory, nullptr);
    ASSERT_STREQ(factory->Name(), mock::MockTableFactory::kClassName());
#ifndef ROCKSDB_LITE
    ASSERT_OK(GetColumnFamilyOptionsFromString(
        config_options_, cf_opts_,
        opts_str + mock::MockTableFactory::kClassName(), &cf_opts_));
    ASSERT_NE(cf_opts_.table_factory.get(), nullptr);
    ASSERT_STREQ(cf_opts_.table_factory->Name(),
                 mock::MockTableFactory::kClassName());
#endif  // ROCKSDB_LITE
  }
}

TEST_F(LoadCustomizableTest, LoadFileSystemTest) {
  ColumnFamilyOptions cf_opts;
  std::shared_ptr<FileSystem> result;
  ASSERT_NOK(FileSystem::CreateFromString(
      config_options_, DummyFileSystem::kClassName(), &result));
  ASSERT_OK(FileSystem::CreateFromString(config_options_,
                                         FileSystem::kDefaultName(), &result));
  ASSERT_NE(result, nullptr);
  ASSERT_TRUE(result->IsInstanceOf(FileSystem::kDefaultName()));
  if (RegisterTests("Test")) {
    ASSERT_OK(FileSystem::CreateFromString(
        config_options_, DummyFileSystem::kClassName(), &result));
    ASSERT_NE(result, nullptr);
    ASSERT_STREQ(result->Name(), DummyFileSystem::kClassName());
    ASSERT_FALSE(result->IsInstanceOf(FileSystem::kDefaultName()));
  }
}

TEST_F(LoadCustomizableTest, LoadSecondaryCacheTest) {
  std::shared_ptr<SecondaryCache> result;
  ASSERT_NOK(SecondaryCache::CreateFromString(
      config_options_, TestSecondaryCache::kClassName(), &result));
  if (RegisterTests("Test")) {
    ASSERT_OK(SecondaryCache::CreateFromString(
        config_options_, TestSecondaryCache::kClassName(), &result));
    ASSERT_NE(result, nullptr);
    ASSERT_STREQ(result->Name(), TestSecondaryCache::kClassName());
  }
}

#ifndef ROCKSDB_LITE
TEST_F(LoadCustomizableTest, LoadSstPartitionerFactoryTest) {
  std::shared_ptr<SstPartitionerFactory> factory;
  ASSERT_NOK(SstPartitionerFactory::CreateFromString(config_options_, "Mock",
                                                     &factory));
  ASSERT_OK(SstPartitionerFactory::CreateFromString(
      config_options_, SstPartitionerFixedPrefixFactory::kClassName(),
      &factory));
  ASSERT_NE(factory, nullptr);
  ASSERT_STREQ(factory->Name(), SstPartitionerFixedPrefixFactory::kClassName());

  if (RegisterTests("Test")) {
    ASSERT_OK(SstPartitionerFactory::CreateFromString(config_options_, "Mock",
                                                      &factory));
    ASSERT_NE(factory, nullptr);
    ASSERT_STREQ(factory->Name(), "Mock");
  }
}
#endif  // ROCKSDB_LITE

TEST_F(LoadCustomizableTest, LoadChecksumGenFactoryTest) {
  std::shared_ptr<FileChecksumGenFactory> factory;
  ASSERT_NOK(FileChecksumGenFactory::CreateFromString(config_options_, "Mock",
                                                      &factory));
  ASSERT_OK(FileChecksumGenFactory::CreateFromString(
      config_options_, FileChecksumGenCrc32cFactory::kClassName(), &factory));
  ASSERT_NE(factory, nullptr);
  ASSERT_STREQ(factory->Name(), FileChecksumGenCrc32cFactory::kClassName());

  if (RegisterTests("Test")) {
    ASSERT_OK(FileChecksumGenFactory::CreateFromString(config_options_, "Mock",
                                                       &factory));
    ASSERT_NE(factory, nullptr);
    ASSERT_STREQ(factory->Name(), "Mock");
  }
}

TEST_F(LoadCustomizableTest, LoadTablePropertiesCollectorFactoryTest) {
  std::shared_ptr<TablePropertiesCollectorFactory> factory;
  ASSERT_NOK(TablePropertiesCollectorFactory::CreateFromString(
      config_options_, MockTablePropertiesCollectorFactory::kClassName(),
      &factory));
  if (RegisterTests("Test")) {
    ASSERT_OK(TablePropertiesCollectorFactory::CreateFromString(
        config_options_, MockTablePropertiesCollectorFactory::kClassName(),
        &factory));
    ASSERT_NE(factory, nullptr);
    ASSERT_STREQ(factory->Name(),
                 MockTablePropertiesCollectorFactory::kClassName());
  }
}

TEST_F(LoadCustomizableTest, LoadComparatorTest) {
  const Comparator* bytewise = BytewiseComparator();
  const Comparator* reverse = ReverseBytewiseComparator();

  const Comparator* result = nullptr;
  ASSERT_NOK(Comparator::CreateFromString(
      config_options_, test::SimpleSuffixReverseComparator::kClassName(),
      &result));
  ASSERT_OK(
      Comparator::CreateFromString(config_options_, bytewise->Name(), &result));
  ASSERT_EQ(result, bytewise);
  ASSERT_OK(
      Comparator::CreateFromString(config_options_, reverse->Name(), &result));
  ASSERT_EQ(result, reverse);

  if (RegisterTests("Test")) {
    ASSERT_OK(Comparator::CreateFromString(
        config_options_, test::SimpleSuffixReverseComparator::kClassName(),
        &result));
    ASSERT_NE(result, nullptr);
    ASSERT_STREQ(result->Name(),
                 test::SimpleSuffixReverseComparator::kClassName());
  }
}

TEST_F(LoadCustomizableTest, LoadSliceTransformFactoryTest) {
  std::shared_ptr<const SliceTransform> result;
  ASSERT_NOK(
      SliceTransform::CreateFromString(config_options_, "Mock", &result));
  ASSERT_OK(
      SliceTransform::CreateFromString(config_options_, "fixed:16", &result));
  ASSERT_NE(result.get(), nullptr);
  ASSERT_TRUE(result->IsInstanceOf("fixed"));
  ASSERT_OK(SliceTransform::CreateFromString(
      config_options_, "rocksdb.FixedPrefix.22", &result));
  ASSERT_NE(result.get(), nullptr);
  ASSERT_TRUE(result->IsInstanceOf("fixed"));

  ASSERT_OK(
      SliceTransform::CreateFromString(config_options_, "capped:16", &result));
  ASSERT_NE(result.get(), nullptr);
  ASSERT_TRUE(result->IsInstanceOf("capped"));

  ASSERT_OK(SliceTransform::CreateFromString(
      config_options_, "rocksdb.CappedPrefix.11", &result));
  ASSERT_NE(result.get(), nullptr);
  ASSERT_TRUE(result->IsInstanceOf("capped"));

  if (RegisterTests("Test")) {
    ASSERT_OK(
        SliceTransform::CreateFromString(config_options_, "Mock", &result));
    ASSERT_NE(result, nullptr);
    ASSERT_STREQ(result->Name(), "Mock");
  }
}

TEST_F(LoadCustomizableTest, LoadStatisticsTest) {
  std::shared_ptr<Statistics> stats;
  ASSERT_NOK(Statistics::CreateFromString(
      config_options_, TestStatistics::kClassName(), &stats));
  ASSERT_OK(
      Statistics::CreateFromString(config_options_, "BasicStatistics", &stats));
  ASSERT_NE(stats, nullptr);
  ASSERT_EQ(stats->Name(), std::string("BasicStatistics"));
#ifndef ROCKSDB_LITE
  ASSERT_NOK(GetDBOptionsFromString(config_options_, db_opts_,
                                    "statistics=Test", &db_opts_));
  ASSERT_OK(GetDBOptionsFromString(config_options_, db_opts_,
                                   "statistics=BasicStatistics", &db_opts_));
  ASSERT_NE(db_opts_.statistics, nullptr);
  ASSERT_STREQ(db_opts_.statistics->Name(), "BasicStatistics");

  if (RegisterTests("test")) {
    ASSERT_OK(Statistics::CreateFromString(
        config_options_, TestStatistics::kClassName(), &stats));
    ASSERT_NE(stats, nullptr);
    ASSERT_STREQ(stats->Name(), TestStatistics::kClassName());

    ASSERT_OK(GetDBOptionsFromString(config_options_, db_opts_,
                                     "statistics=Test", &db_opts_));
    ASSERT_NE(db_opts_.statistics, nullptr);
    ASSERT_STREQ(db_opts_.statistics->Name(), TestStatistics::kClassName());

    ASSERT_OK(GetDBOptionsFromString(
        config_options_, db_opts_, "statistics={id=Test;inner=BasicStatistics}",
        &db_opts_));
    ASSERT_NE(db_opts_.statistics, nullptr);
    ASSERT_STREQ(db_opts_.statistics->Name(), TestStatistics::kClassName());
    auto* inner = db_opts_.statistics->GetOptions<std::shared_ptr<Statistics>>(
        "StatisticsOptions");
    ASSERT_NE(inner, nullptr);
    ASSERT_NE(inner->get(), nullptr);
    ASSERT_STREQ(inner->get()->Name(), "BasicStatistics");

    ASSERT_OK(Statistics::CreateFromString(
        config_options_, "id=BasicStatistics;inner=Test", &stats));
    ASSERT_NE(stats, nullptr);
    ASSERT_STREQ(stats->Name(), "BasicStatistics");
    inner = stats->GetOptions<std::shared_ptr<Statistics>>("StatisticsOptions");
    ASSERT_NE(inner, nullptr);
    ASSERT_NE(inner->get(), nullptr);
    ASSERT_STREQ(inner->get()->Name(), TestStatistics::kClassName());
  }
#endif
}

TEST_F(LoadCustomizableTest, LoadMemTableRepFactoryTest) {
  std::unique_ptr<MemTableRepFactory> result;
  ASSERT_NOK(MemTableRepFactory::CreateFromString(
      config_options_, "SpecialSkipListFactory", &result));
  ASSERT_OK(MemTableRepFactory::CreateFromString(
      config_options_, SkipListFactory::kClassName(), &result));
  ASSERT_NE(result.get(), nullptr);
  ASSERT_TRUE(result->IsInstanceOf(SkipListFactory::kClassName()));

  if (RegisterTests("Test")) {
    ASSERT_OK(MemTableRepFactory::CreateFromString(
        config_options_, "SpecialSkipListFactory", &result));
    ASSERT_NE(result, nullptr);
    ASSERT_STREQ(result->Name(), "SpecialSkipListFactory");
  }
}

TEST_F(LoadCustomizableTest, LoadMergeOperatorTest) {
  std::shared_ptr<MergeOperator> result;

  ASSERT_NOK(
      MergeOperator::CreateFromString(config_options_, "Changling", &result));
  //**TODO: MJR: Use the constants when these names are in public classes
  ASSERT_OK(MergeOperator::CreateFromString(config_options_, "put", &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), "PutOperator");
  ASSERT_OK(
      MergeOperator::CreateFromString(config_options_, "PutOperator", &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), "PutOperator");
  ASSERT_OK(
      MergeOperator::CreateFromString(config_options_, "put_v1", &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), "PutOperator");

  ASSERT_OK(
      MergeOperator::CreateFromString(config_options_, "uint64add", &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), "UInt64AddOperator");
  ASSERT_OK(MergeOperator::CreateFromString(config_options_,
                                            "UInt64AddOperator", &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), "UInt64AddOperator");

  ASSERT_OK(MergeOperator::CreateFromString(config_options_, "max", &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), "MaxOperator");
  ASSERT_OK(
      MergeOperator::CreateFromString(config_options_, "MaxOperator", &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), "MaxOperator");
#ifndef ROCKSDB_LITE
  ASSERT_OK(MergeOperator::CreateFromString(
      config_options_, StringAppendOperator::kNickName(), &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), StringAppendOperator::kClassName());
  ASSERT_OK(MergeOperator::CreateFromString(
      config_options_, StringAppendOperator::kClassName(), &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), StringAppendOperator::kClassName());

  ASSERT_OK(MergeOperator::CreateFromString(
      config_options_, StringAppendTESTOperator::kNickName(), &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), StringAppendTESTOperator::kClassName());
  ASSERT_OK(MergeOperator::CreateFromString(
      config_options_, StringAppendTESTOperator::kClassName(), &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), StringAppendTESTOperator::kClassName());

  ASSERT_OK(MergeOperator::CreateFromString(config_options_,
                                            SortList::kNickName(), &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), SortList::kClassName());
  ASSERT_OK(MergeOperator::CreateFromString(config_options_,
                                            SortList::kClassName(), &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), SortList::kClassName());

  ASSERT_OK(MergeOperator::CreateFromString(
      config_options_, BytesXOROperator::kNickName(), &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), BytesXOROperator::kClassName());
  ASSERT_OK(MergeOperator::CreateFromString(
      config_options_, BytesXOROperator::kClassName(), &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), BytesXOROperator::kClassName());
#endif  // ROCKSDB_LITE
  ASSERT_NOK(
      MergeOperator::CreateFromString(config_options_, "Changling", &result));
  if (RegisterTests("Test")) {
    ASSERT_OK(
        MergeOperator::CreateFromString(config_options_, "Changling", &result));
    ASSERT_NE(result, nullptr);
    ASSERT_STREQ(result->Name(), "ChanglingMergeOperator");
  }
}

TEST_F(LoadCustomizableTest, LoadCompactionFilterFactoryTest) {
  std::shared_ptr<CompactionFilterFactory> result;

  ASSERT_NOK(CompactionFilterFactory::CreateFromString(config_options_,
                                                       "Changling", &result));
  if (RegisterTests("Test")) {
    ASSERT_OK(CompactionFilterFactory::CreateFromString(config_options_,
                                                        "Changling", &result));
    ASSERT_NE(result, nullptr);
    ASSERT_STREQ(result->Name(), "ChanglingCompactionFilterFactory");
  }
}

TEST_F(LoadCustomizableTest, LoadCompactionFilterTest) {
  const CompactionFilter* result = nullptr;

  ASSERT_NOK(CompactionFilter::CreateFromString(config_options_, "Changling",
                                                &result));
#ifndef ROCKSDB_LITE
  ASSERT_OK(CompactionFilter::CreateFromString(
      config_options_, RemoveEmptyValueCompactionFilter::kClassName(),
      &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), RemoveEmptyValueCompactionFilter::kClassName());
  delete result;
  result = nullptr;
  if (RegisterTests("Test")) {
    ASSERT_OK(CompactionFilter::CreateFromString(config_options_, "Changling",
                                                 &result));
    ASSERT_NE(result, nullptr);
    ASSERT_STREQ(result->Name(), "ChanglingCompactionFilter");
    delete result;
  }
#endif  // ROCKSDB_LITE
}

#ifndef ROCKSDB_LITE
TEST_F(LoadCustomizableTest, LoadEventListenerTest) {
  std::shared_ptr<EventListener> result;

  ASSERT_NOK(EventListener::CreateFromString(
      config_options_, OnFileDeletionListener::kClassName(), &result));
  ASSERT_NOK(EventListener::CreateFromString(
      config_options_, FlushCounterListener::kClassName(), &result));
  if (RegisterTests("Test")) {
    ASSERT_OK(EventListener::CreateFromString(
        config_options_, OnFileDeletionListener::kClassName(), &result));
    ASSERT_NE(result, nullptr);
    ASSERT_STREQ(result->Name(), OnFileDeletionListener::kClassName());
    ASSERT_OK(EventListener::CreateFromString(
        config_options_, FlushCounterListener::kClassName(), &result));
    ASSERT_NE(result, nullptr);
    ASSERT_STREQ(result->Name(), FlushCounterListener::kClassName());
  }
}

TEST_F(LoadCustomizableTest, LoadEncryptionProviderTest) {
  std::shared_ptr<EncryptionProvider> result;
  ASSERT_NOK(
      EncryptionProvider::CreateFromString(config_options_, "Mock", &result));
  ASSERT_OK(
      EncryptionProvider::CreateFromString(config_options_, "CTR", &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), "CTR");
  ASSERT_NOK(result->ValidateOptions(db_opts_, cf_opts_));
  ASSERT_OK(EncryptionProvider::CreateFromString(config_options_, "CTR://test",
                                                 &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), "CTR");
  ASSERT_OK(result->ValidateOptions(db_opts_, cf_opts_));

  if (RegisterTests("Test")) {
    ASSERT_OK(
        EncryptionProvider::CreateFromString(config_options_, "Mock", &result));
    ASSERT_NE(result, nullptr);
    ASSERT_STREQ(result->Name(), "Mock");
    ASSERT_OK(EncryptionProvider::CreateFromString(config_options_,
                                                   "Mock://test", &result));
    ASSERT_NE(result, nullptr);
    ASSERT_STREQ(result->Name(), "Mock");
    ASSERT_OK(result->ValidateOptions(db_opts_, cf_opts_));
  }
}

TEST_F(LoadCustomizableTest, LoadEncryptionCipherTest) {
  std::shared_ptr<BlockCipher> result;
  ASSERT_NOK(BlockCipher::CreateFromString(config_options_, "Mock", &result));
  ASSERT_OK(BlockCipher::CreateFromString(config_options_, "ROT13", &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), "ROT13");
  if (RegisterTests("Test")) {
    ASSERT_OK(BlockCipher::CreateFromString(config_options_, "Mock", &result));
    ASSERT_NE(result, nullptr);
    ASSERT_STREQ(result->Name(), "Mock");
  }
}
#endif  // !ROCKSDB_LITE

TEST_F(LoadCustomizableTest, LoadSystemClockTest) {
  std::shared_ptr<SystemClock> result;
  ASSERT_NOK(SystemClock::CreateFromString(
      config_options_, MockSystemClock::kClassName(), &result));
  ASSERT_OK(SystemClock::CreateFromString(
      config_options_, SystemClock::kDefaultName(), &result));
  ASSERT_NE(result, nullptr);
  ASSERT_TRUE(result->IsInstanceOf(SystemClock::kDefaultName()));
  if (RegisterTests("Test")) {
    ASSERT_OK(SystemClock::CreateFromString(
        config_options_, MockSystemClock::kClassName(), &result));
    ASSERT_NE(result, nullptr);
    ASSERT_STREQ(result->Name(), MockSystemClock::kClassName());
  }
}

TEST_F(LoadCustomizableTest, LoadMemoryAllocatorTest) {
  std::shared_ptr<MemoryAllocator> result;
  ASSERT_NOK(MemoryAllocator::CreateFromString(
      config_options_, MockMemoryAllocator::kClassName(), &result));
  ASSERT_OK(MemoryAllocator::CreateFromString(
      config_options_, DefaultMemoryAllocator::kClassName(), &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), DefaultMemoryAllocator::kClassName());
  if (RegisterTests("Test")) {
    ASSERT_OK(MemoryAllocator::CreateFromString(
        config_options_, MockMemoryAllocator::kClassName(), &result));
    ASSERT_NE(result, nullptr);
    ASSERT_STREQ(result->Name(), MockMemoryAllocator::kClassName());
  }
}

TEST_F(LoadCustomizableTest, LoadRateLimiterTest) {
  std::shared_ptr<RateLimiter> result;
  ASSERT_NOK(RateLimiter::CreateFromString(
      config_options_, MockRateLimiter::kClassName(), &result));
  ASSERT_OK(RateLimiter::CreateFromString(
      config_options_, std::string(GenericRateLimiter::kClassName()) + ":1234",
      &result));
  ASSERT_NE(result, nullptr);
#ifndef ROCKSDB_LITE
  ASSERT_OK(RateLimiter::CreateFromString(
      config_options_, GenericRateLimiter::kClassName(), &result));
  ASSERT_NE(result, nullptr);
  ASSERT_OK(GetDBOptionsFromString(
      config_options_, db_opts_,
      std::string("rate_limiter=") + GenericRateLimiter::kClassName(),
      &db_opts_));
  ASSERT_NE(db_opts_.rate_limiter, nullptr);
  if (RegisterTests("Test")) {
    ASSERT_OK(RateLimiter::CreateFromString(
        config_options_, MockRateLimiter::kClassName(), &result));
    ASSERT_NE(result, nullptr);
    ASSERT_OK(GetDBOptionsFromString(
        config_options_, db_opts_,
        std::string("rate_limiter=") + MockRateLimiter::kClassName(),
        &db_opts_));
    ASSERT_NE(db_opts_.rate_limiter, nullptr);
  }
#endif  // ROCKSDB_LITE
}

TEST_F(LoadCustomizableTest, LoadFlushBlockPolicyFactoryTest) {
  std::shared_ptr<TableFactory> table;
  std::shared_ptr<FlushBlockPolicyFactory> result;
  ASSERT_NOK(FlushBlockPolicyFactory::CreateFromString(
      config_options_, TestFlushBlockPolicyFactory::kClassName(), &result));

  ASSERT_OK(
      FlushBlockPolicyFactory::CreateFromString(config_options_, "", &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), FlushBlockBySizePolicyFactory::kClassName());

  ASSERT_OK(FlushBlockPolicyFactory::CreateFromString(
      config_options_, FlushBlockEveryKeyPolicyFactory::kClassName(), &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), FlushBlockEveryKeyPolicyFactory::kClassName());

  ASSERT_OK(FlushBlockPolicyFactory::CreateFromString(
      config_options_, FlushBlockBySizePolicyFactory::kClassName(), &result));
  ASSERT_NE(result, nullptr);
  ASSERT_STREQ(result->Name(), FlushBlockBySizePolicyFactory::kClassName());
#ifndef ROCKSDB_LITE
  std::string table_opts = "id=BlockBasedTable; flush_block_policy_factory=";
  ASSERT_OK(TableFactory::CreateFromString(
      config_options_,
      table_opts + FlushBlockEveryKeyPolicyFactory::kClassName(), &table));
  auto bbto = table->GetOptions<BlockBasedTableOptions>();
  ASSERT_NE(bbto, nullptr);
  ASSERT_NE(bbto->flush_block_policy_factory.get(), nullptr);
  ASSERT_STREQ(bbto->flush_block_policy_factory->Name(),
               FlushBlockEveryKeyPolicyFactory::kClassName());
  if (RegisterTests("Test")) {
    ASSERT_OK(FlushBlockPolicyFactory::CreateFromString(
        config_options_, TestFlushBlockPolicyFactory::kClassName(), &result));
    ASSERT_NE(result, nullptr);
    ASSERT_STREQ(result->Name(), TestFlushBlockPolicyFactory::kClassName());
    ASSERT_OK(TableFactory::CreateFromString(
        config_options_, table_opts + TestFlushBlockPolicyFactory::kClassName(),
        &table));
    bbto = table->GetOptions<BlockBasedTableOptions>();
    ASSERT_NE(bbto, nullptr);
    ASSERT_NE(bbto->flush_block_policy_factory.get(), nullptr);
    ASSERT_STREQ(bbto->flush_block_policy_factory->Name(),
                 TestFlushBlockPolicyFactory::kClassName());
  }
#endif  // ROCKSDB_LITE
}

}  // namespace ROCKSDB_NAMESPACE
int main(int argc, char** argv) {
  ::testing::InitGoogleTest(&argc, argv);
  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
#ifdef GFLAGS
  ParseCommandLineFlags(&argc, &argv, true);
#endif  // GFLAGS
  return RUN_ALL_TESTS();
}