37cd617b6b
Summary: This change adds a virtual `Truncate` method to `Env`, which truncates the named file to the specified size. At the moment, this is only supported for `MockEnv`, but other `Env's` could be extended to override the method too. This is the same approach that methods like `LinkFile` and `AreSameFile` have taken. This is useful for any user of the in-memory `Env`. The implementation's header is not exported, so before this change, it was impossible to access it's already existing `Truncate` method. Closes https://github.com/facebook/rocksdb/pull/3779 Differential Revision: D7785789 Pulled By: ajkr fbshipit-source-id: 3bcdaeea7b7180529f7d9b496dc67b791a00bbf0
115 lines
4.1 KiB
C++
115 lines
4.1 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#pragma once
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#include <atomic>
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#include <map>
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#include <string>
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#include <vector>
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#include "rocksdb/env.h"
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#include "rocksdb/status.h"
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#include "port/port.h"
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#include "util/mutexlock.h"
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namespace rocksdb {
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class MemFile;
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class MockEnv : public EnvWrapper {
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public:
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explicit MockEnv(Env* base_env);
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virtual ~MockEnv();
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// Partial implementation of the Env interface.
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virtual Status NewSequentialFile(const std::string& fname,
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unique_ptr<SequentialFile>* result,
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const EnvOptions& soptions) override;
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virtual Status NewRandomAccessFile(const std::string& fname,
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unique_ptr<RandomAccessFile>* result,
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const EnvOptions& soptions) override;
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virtual Status NewRandomRWFile(const std::string& fname,
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unique_ptr<RandomRWFile>* result,
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const EnvOptions& options) override;
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virtual Status ReuseWritableFile(const std::string& fname,
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const std::string& old_fname,
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unique_ptr<WritableFile>* result,
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const EnvOptions& options) override;
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virtual Status NewWritableFile(const std::string& fname,
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unique_ptr<WritableFile>* result,
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const EnvOptions& env_options) override;
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virtual Status NewDirectory(const std::string& name,
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unique_ptr<Directory>* result) override;
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virtual Status FileExists(const std::string& fname) override;
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virtual Status GetChildren(const std::string& dir,
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std::vector<std::string>* result) override;
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void DeleteFileInternal(const std::string& fname);
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virtual Status DeleteFile(const std::string& fname) override;
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virtual Status Truncate(const std::string& fname, size_t size) override;
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virtual Status CreateDir(const std::string& dirname) override;
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virtual Status CreateDirIfMissing(const std::string& dirname) override;
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virtual Status DeleteDir(const std::string& dirname) override;
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virtual Status GetFileSize(const std::string& fname,
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uint64_t* file_size) override;
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virtual Status GetFileModificationTime(const std::string& fname,
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uint64_t* time) override;
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virtual Status RenameFile(const std::string& src,
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const std::string& target) override;
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virtual Status LinkFile(const std::string& src,
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const std::string& target) override;
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virtual Status NewLogger(const std::string& fname,
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shared_ptr<Logger>* result) override;
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virtual Status LockFile(const std::string& fname, FileLock** flock) override;
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virtual Status UnlockFile(FileLock* flock) override;
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virtual Status GetTestDirectory(std::string* path) override;
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// Results of these can be affected by FakeSleepForMicroseconds()
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virtual Status GetCurrentTime(int64_t* unix_time) override;
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virtual uint64_t NowMicros() override;
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virtual uint64_t NowNanos() override;
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Status CorruptBuffer(const std::string& fname);
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// Doesn't really sleep, just affects output of GetCurrentTime(), NowMicros()
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// and NowNanos()
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void FakeSleepForMicroseconds(int64_t micros);
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private:
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std::string NormalizePath(const std::string path);
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// Map from filenames to MemFile objects, representing a simple file system.
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typedef std::map<std::string, MemFile*> FileSystem;
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port::Mutex mutex_;
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FileSystem file_map_; // Protected by mutex_.
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std::atomic<int64_t> fake_sleep_micros_;
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};
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} // namespace rocksdb
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