rocksdb/env/composite_env_wrapper.h
mrambacher 4a09d632c4 Remove Legacy and Custom FileWrapper classes from header files (#7851)
Summary:
Removed the uses of the Legacy FileWrapper classes from the source code.  The wrappers were creating an additional layer of indirection/wrapping, as the Env already has a FileSystem.

Moved the Custom FileWrapper classes into the CustomEnv, as these classes are really for the private use the the CustomEnv class.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7851

Reviewed By: anand1976

Differential Revision: D26114816

Pulled By: mrambacher

fbshipit-source-id: db32840e58d969d3a0fa6c25aaf13d6dcdc74150
2021-01-28 22:10:32 -08:00

338 lines
12 KiB
C++

// Copyright (c) 2019-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).
#pragma once
#include "rocksdb/env.h"
#include "rocksdb/file_system.h"
#include "rocksdb/system_clock.h"
#ifdef _WIN32
// Windows API macro interference
#undef DeleteFile
#undef GetCurrentTime
#undef LoadLibrary
#endif
namespace ROCKSDB_NAMESPACE {
class CompositeEnv : public Env {
public:
// Initialize a CompositeEnvWrapper that delegates all thread/time related
// calls to env, and all file operations to fs
explicit CompositeEnv(const std::shared_ptr<FileSystem>& fs,
const std::shared_ptr<SystemClock>& clock)
: Env(fs, clock) {}
Status RegisterDbPaths(const std::vector<std::string>& paths) override {
return file_system_->RegisterDbPaths(paths);
}
Status UnregisterDbPaths(const std::vector<std::string>& paths) override {
return file_system_->UnregisterDbPaths(paths);
}
// The following text is boilerplate that forwards all methods to target()
Status NewSequentialFile(const std::string& f,
std::unique_ptr<SequentialFile>* r,
const EnvOptions& options) override;
Status NewRandomAccessFile(const std::string& f,
std::unique_ptr<RandomAccessFile>* r,
const EnvOptions& options) override;
Status NewWritableFile(const std::string& f, std::unique_ptr<WritableFile>* r,
const EnvOptions& options) override;
Status ReopenWritableFile(const std::string& fname,
std::unique_ptr<WritableFile>* result,
const EnvOptions& options) override;
Status ReuseWritableFile(const std::string& fname,
const std::string& old_fname,
std::unique_ptr<WritableFile>* r,
const EnvOptions& options) override;
Status NewRandomRWFile(const std::string& fname,
std::unique_ptr<RandomRWFile>* result,
const EnvOptions& options) override;
Status NewMemoryMappedFileBuffer(
const std::string& fname,
std::unique_ptr<MemoryMappedFileBuffer>* result) override {
return file_system_->NewMemoryMappedFileBuffer(fname, result);
}
Status NewDirectory(const std::string& name,
std::unique_ptr<Directory>* result) override;
Status FileExists(const std::string& f) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->FileExists(f, io_opts, &dbg);
}
Status GetChildren(const std::string& dir,
std::vector<std::string>* r) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->GetChildren(dir, io_opts, r, &dbg);
}
Status GetChildrenFileAttributes(
const std::string& dir, std::vector<FileAttributes>* result) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->GetChildrenFileAttributes(dir, io_opts, result, &dbg);
}
Status DeleteFile(const std::string& f) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->DeleteFile(f, io_opts, &dbg);
}
Status Truncate(const std::string& fname, size_t size) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->Truncate(fname, size, io_opts, &dbg);
}
Status CreateDir(const std::string& d) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->CreateDir(d, io_opts, &dbg);
}
Status CreateDirIfMissing(const std::string& d) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->CreateDirIfMissing(d, io_opts, &dbg);
}
Status DeleteDir(const std::string& d) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->DeleteDir(d, io_opts, &dbg);
}
Status GetFileSize(const std::string& f, uint64_t* s) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->GetFileSize(f, io_opts, s, &dbg);
}
Status GetFileModificationTime(const std::string& fname,
uint64_t* file_mtime) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->GetFileModificationTime(fname, io_opts, file_mtime,
&dbg);
}
Status RenameFile(const std::string& s, const std::string& t) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->RenameFile(s, t, io_opts, &dbg);
}
Status LinkFile(const std::string& s, const std::string& t) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->LinkFile(s, t, io_opts, &dbg);
}
Status NumFileLinks(const std::string& fname, uint64_t* count) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->NumFileLinks(fname, io_opts, count, &dbg);
}
Status AreFilesSame(const std::string& first, const std::string& second,
bool* res) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->AreFilesSame(first, second, io_opts, res, &dbg);
}
Status LockFile(const std::string& f, FileLock** l) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->LockFile(f, io_opts, l, &dbg);
}
Status UnlockFile(FileLock* l) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->UnlockFile(l, io_opts, &dbg);
}
Status GetAbsolutePath(const std::string& db_path,
std::string* output_path) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->GetAbsolutePath(db_path, io_opts, output_path, &dbg);
}
Status NewLogger(const std::string& fname,
std::shared_ptr<Logger>* result) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->NewLogger(fname, io_opts, result, &dbg);
}
Status IsDirectory(const std::string& path, bool* is_dir) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->IsDirectory(path, io_opts, is_dir, &dbg);
}
Status GetTestDirectory(std::string* path) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->GetTestDirectory(io_opts, path, &dbg);
}
EnvOptions OptimizeForLogRead(const EnvOptions& env_options) const override {
return file_system_->OptimizeForLogRead(FileOptions(env_options));
}
EnvOptions OptimizeForManifestRead(
const EnvOptions& env_options) const override {
return file_system_->OptimizeForManifestRead(FileOptions(env_options));
}
EnvOptions OptimizeForLogWrite(const EnvOptions& env_options,
const DBOptions& db_options) const override {
return file_system_->OptimizeForLogWrite(FileOptions(env_options),
db_options);
}
EnvOptions OptimizeForManifestWrite(
const EnvOptions& env_options) const override {
return file_system_->OptimizeForManifestWrite(FileOptions(env_options));
}
EnvOptions OptimizeForCompactionTableWrite(
const EnvOptions& env_options,
const ImmutableDBOptions& immutable_ops) const override {
return file_system_->OptimizeForCompactionTableWrite(
FileOptions(env_options), immutable_ops);
}
EnvOptions OptimizeForCompactionTableRead(
const EnvOptions& env_options,
const ImmutableDBOptions& db_options) const override {
return file_system_->OptimizeForCompactionTableRead(
FileOptions(env_options), db_options);
}
// This seems to clash with a macro on Windows, so #undef it here
#ifdef GetFreeSpace
#undef GetFreeSpace
#endif
Status GetFreeSpace(const std::string& path, uint64_t* diskfree) override {
IOOptions io_opts;
IODebugContext dbg;
return file_system_->GetFreeSpace(path, io_opts, diskfree, &dbg);
}
uint64_t NowMicros() override { return system_clock_->NowMicros(); }
uint64_t NowNanos() override { return system_clock_->NowNanos(); }
uint64_t NowCPUNanos() override { return system_clock_->CPUNanos(); }
void SleepForMicroseconds(int micros) override {
system_clock_->SleepForMicroseconds(micros);
}
Status GetCurrentTime(int64_t* unix_time) override {
return system_clock_->GetCurrentTime(unix_time);
}
std::string TimeToString(uint64_t time) override {
return system_clock_->TimeToString(time);
}
};
class CompositeEnvWrapper : public CompositeEnv {
public:
// Initialize a CompositeEnvWrapper that delegates all thread/time related
// calls to env, and all file operations to fs
explicit CompositeEnvWrapper(Env* env, const std::shared_ptr<FileSystem>& fs)
: CompositeEnvWrapper(env, fs, env->GetSystemClock()) {}
explicit CompositeEnvWrapper(Env* env, const std::shared_ptr<SystemClock>& sc)
: CompositeEnvWrapper(env, env->GetFileSystem(), sc) {}
explicit CompositeEnvWrapper(Env* env, const std::shared_ptr<FileSystem>& fs,
const std::shared_ptr<SystemClock>& sc)
: CompositeEnv(fs, sc), env_target_(env) {}
// Return the target to which this Env forwards all calls
Env* env_target() const { return env_target_; }
#if !defined(OS_WIN) && !defined(ROCKSDB_NO_DYNAMIC_EXTENSION)
Status LoadLibrary(const std::string& lib_name,
const std::string& search_path,
std::shared_ptr<DynamicLibrary>* result) override {
return env_target_->LoadLibrary(lib_name, search_path, result);
}
#endif
void Schedule(void (*f)(void* arg), void* a, Priority pri,
void* tag = nullptr, void (*u)(void* arg) = nullptr) override {
return env_target_->Schedule(f, a, pri, tag, u);
}
int UnSchedule(void* tag, Priority pri) override {
return env_target_->UnSchedule(tag, pri);
}
void StartThread(void (*f)(void*), void* a) override {
return env_target_->StartThread(f, a);
}
void WaitForJoin() override { return env_target_->WaitForJoin(); }
unsigned int GetThreadPoolQueueLen(Priority pri = LOW) const override {
return env_target_->GetThreadPoolQueueLen(pri);
}
Status GetHostName(char* name, uint64_t len) override {
return env_target_->GetHostName(name, len);
}
void SetBackgroundThreads(int num, Priority pri) override {
return env_target_->SetBackgroundThreads(num, pri);
}
int GetBackgroundThreads(Priority pri) override {
return env_target_->GetBackgroundThreads(pri);
}
Status SetAllowNonOwnerAccess(bool allow_non_owner_access) override {
return env_target_->SetAllowNonOwnerAccess(allow_non_owner_access);
}
void IncBackgroundThreadsIfNeeded(int num, Priority pri) override {
return env_target_->IncBackgroundThreadsIfNeeded(num, pri);
}
void LowerThreadPoolIOPriority(Priority pool) override {
env_target_->LowerThreadPoolIOPriority(pool);
}
void LowerThreadPoolCPUPriority(Priority pool) override {
env_target_->LowerThreadPoolCPUPriority(pool);
}
Status LowerThreadPoolCPUPriority(Priority pool, CpuPriority pri) override {
return env_target_->LowerThreadPoolCPUPriority(pool, pri);
}
Status GetThreadList(std::vector<ThreadStatus>* thread_list) override {
return env_target_->GetThreadList(thread_list);
}
ThreadStatusUpdater* GetThreadStatusUpdater() const override {
return env_target_->GetThreadStatusUpdater();
}
uint64_t GetThreadID() const override { return env_target_->GetThreadID(); }
std::string GenerateUniqueId() override {
return env_target_->GenerateUniqueId();
}
private:
Env* env_target_;
};
} // namespace ROCKSDB_NAMESPACE