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rocksdb/table/mock_table.h

187 lines
5.6 KiB

// 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.
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
#pragma once
#include <algorithm>
#include <set>
#include <memory>
#include <atomic>
#include <map>
#include <string>
#include "rocksdb/table.h"
#include "table/table_reader.h"
#include "table/table_builder.h"
#include "port/port.h"
#include "util/mutexlock.h"
#include "util/testharness.h"
#include "util/testutil.h"
namespace rocksdb {
namespace mock {
typedef std::map<std::string, std::string> MockFileContents;
// NOTE this currently only supports bitwise comparator
struct MockTableFileSystem {
port::Mutex mutex;
std::map<uint32_t, MockFileContents> files;
};
class MockTableReader : public TableReader {
public:
explicit MockTableReader(const MockFileContents& table) : table_(table) {}
Iterator* NewIterator(const ReadOptions&, Arena* arena) override;
Status Get(const ReadOptions&, const Slice& key,
GetContext* get_context) override;
uint64_t ApproximateOffsetOf(const Slice& key) override { return 0; }
virtual size_t ApproximateMemoryUsage() const override { return 0; }
void SetupForCompaction() override {}
std::shared_ptr<const TableProperties> GetTableProperties() const override;
~MockTableReader() {}
private:
const MockFileContents& table_;
};
class MockTableIterator : public Iterator {
public:
explicit MockTableIterator(const MockFileContents& table) : table_(table) {
itr_ = table_.end();
}
bool Valid() const override { return itr_ != table_.end(); }
void SeekToFirst() override { itr_ = table_.begin(); }
void SeekToLast() override {
itr_ = table_.end();
--itr_;
}
void Seek(const Slice& target) override {
std::string str_target(target.data(), target.size());
itr_ = table_.lower_bound(str_target);
}
void Next() override { ++itr_; }
void Prev() override {
if (itr_ == table_.begin()) {
itr_ = table_.end();
} else {
--itr_;
}
}
Slice key() const override { return Slice(itr_->first); }
Slice value() const override { return Slice(itr_->second); }
Status status() const override { return Status::OK(); }
private:
const MockFileContents& table_;
MockFileContents::const_iterator itr_;
};
class MockTableBuilder : public TableBuilder {
public:
MockTableBuilder(uint32_t id, MockTableFileSystem* file_system,
CompressionType compression_type)
: id_(id),
file_system_(file_system),
compression_type_(compression_type) {}
// REQUIRES: Either Finish() or Abandon() has been called.
~MockTableBuilder() {}
// Add key,value to the table being constructed.
// REQUIRES: key is after any previously added key according to comparator.
// REQUIRES: Finish(), Abandon() have not been called
void Add(const Slice& key, const Slice& value) override {
table_.insert({key.ToString(), value.ToString()});
}
// Return non-ok iff some error has been detected.
Status status() const override { return Status::OK(); }
Status Finish() override {
if (finish_cb_ != nullptr) {
(*finish_cb_)(compression_type_, FileSize());
}
MutexLock lock_guard(&file_system_->mutex);
file_system_->files.insert({id_, table_});
return Status::OK();
}
void Abandon() override {}
uint64_t NumEntries() const override { return table_.size(); }
uint64_t FileSize() const override { return table_.size(); }
static std::function<void(const CompressionType&, uint64_t)>* finish_cb_;
private:
uint32_t id_;
MockTableFileSystem* file_system_;
MockFileContents table_;
CompressionType compression_type_;
};
class MockTableFactory : public TableFactory {
public:
MockTableFactory();
const char* Name() const override { return "MockTable"; }
Status NewTableReader(const ImmutableCFOptions& ioptions,
const EnvOptions& env_options,
const InternalKeyComparator& internal_key,
unique_ptr<RandomAccessFile>&& file, uint64_t file_size,
unique_ptr<TableReader>* table_reader) const override;
TableBuilder* NewTableBuilder(
const TableBuilderOptions& table_builder_options,
WritableFile* file) const override;
// This function will directly create mock table instead of going through
// MockTableBuilder. MockFileContents has to have a format of <internal_key,
// value>. Those key-value pairs will then be inserted into the mock table
Status CreateMockTable(Env* env, const std::string& fname,
MockFileContents file_contents);
virtual Status SanitizeOptions(
const DBOptions& db_opts,
const ColumnFamilyOptions& cf_opts) const override {
return Status::OK();
}
virtual std::string GetPrintableTableOptions() const override {
return std::string();
}
// This function will assert that only a single file exists and that the
// contents are equal to file_contents
void AssertSingleFile(const MockFileContents& file_contents);
void AssertLatestFile(const MockFileContents& file_contents);
private:
uint32_t GetAndWriteNextID(WritableFile* file) const;
uint32_t GetIDFromFile(RandomAccessFile* file) const;
mutable MockTableFileSystem file_system_;
mutable std::atomic<uint32_t> next_id_;
};
} // namespace mock
} // namespace rocksdb