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rocksdb/util/mock_env.h

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4.2 KiB

// Copyright (c) 2011-present, 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.
//
// 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.
#pragma once
#include <atomic>
#include <map>
#include <string>
#include <vector>
#include "rocksdb/env.h"
#include "rocksdb/status.h"
#include "port/port.h"
#include "util/mutexlock.h"
namespace rocksdb {
class MemFile;
class MockEnv : public EnvWrapper {
public:
explicit MockEnv(Env* base_env);
virtual ~MockEnv();
// Partial implementation of the Env interface.
virtual Status NewSequentialFile(const std::string& fname,
unique_ptr<SequentialFile>* result,
const EnvOptions& soptions) override;
virtual Status NewRandomAccessFile(const std::string& fname,
unique_ptr<RandomAccessFile>* result,
const EnvOptions& soptions) override;
virtual Status NewRandomRWFile(const std::string& fname,
unique_ptr<RandomRWFile>* result,
const EnvOptions& options) override;
virtual Status ReuseWritableFile(const std::string& fname,
const std::string& old_fname,
unique_ptr<WritableFile>* result,
const EnvOptions& options) override;
virtual Status NewWritableFile(const std::string& fname,
unique_ptr<WritableFile>* result,
const EnvOptions& env_options) override;
virtual Status NewDirectory(const std::string& name,
unique_ptr<Directory>* result) override;
virtual Status FileExists(const std::string& fname) override;
virtual Status GetChildren(const std::string& dir,
std::vector<std::string>* result) override;
void DeleteFileInternal(const std::string& fname);
virtual Status DeleteFile(const std::string& fname) override;
virtual Status CreateDir(const std::string& dirname) override;
virtual Status CreateDirIfMissing(const std::string& dirname) override;
virtual Status DeleteDir(const std::string& dirname) override;
virtual Status GetFileSize(const std::string& fname,
uint64_t* file_size) override;
virtual Status GetFileModificationTime(const std::string& fname,
uint64_t* time) override;
virtual Status RenameFile(const std::string& src,
const std::string& target) override;
virtual Status LinkFile(const std::string& src,
const std::string& target) override;
virtual Status NewLogger(const std::string& fname,
shared_ptr<Logger>* result) override;
virtual Status LockFile(const std::string& fname, FileLock** flock) override;
virtual Status UnlockFile(FileLock* flock) override;
virtual Status GetTestDirectory(std::string* path) override;
// Results of these can be affected by FakeSleepForMicroseconds()
virtual Status GetCurrentTime(int64_t* unix_time) override;
virtual uint64_t NowMicros() override;
virtual uint64_t NowNanos() override;
// Non-virtual functions, specific to MockEnv
Status Truncate(const std::string& fname, size_t size);
Status CorruptBuffer(const std::string& fname);
// Doesn't really sleep, just affects output of GetCurrentTime(), NowMicros()
// and NowNanos()
void FakeSleepForMicroseconds(int64_t micros);
private:
std::string NormalizePath(const std::string path);
// Map from filenames to MemFile objects, representing a simple file system.
typedef std::map<std::string, MemFile*> FileSystem;
port::Mutex mutex_;
FileSystem file_map_; // Protected by mutex_.
std::atomic<int64_t> fake_sleep_micros_;
};
} // namespace rocksdb