TensorFlow教程之API DOC 6.1.2Class tensorflow::EnvWrapper

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Class tensorflow::EnvWrapper

An implementation of Env that forwards all calls to another Env .

May be useful to clients who wish to override just part of the functionality of another Env .

Member Summary

• tensorflow::EnvWrapper::EnvWrapper(Env *t)
  • Initializes an EnvWrapper that delegates all calls to *t.
• virtual tensorflow::EnvWrapper::~EnvWrapper()
• Env* tensorflow::EnvWrapper::target() const
  • Returns the target to which this Env forwards all calls.
• Status tensorflow::EnvWrapper::NewRandomAccessFile(const string &f, RandomAccessFile **r) override
  • Creates a brand new random access read-only file with the specified name.
• Status tensorflow::EnvWrapper::NewWritableFile(const string &f, WritableFile **r) override
  • Creates an object that writes to a new file with the specified name.
• Status tensorflow::EnvWrapper::NewAppendableFile(const string &f, WritableFile **r) override
  • Creates an object that either appends to an existing file, or writes to a new file (if the file does not exist to begin with).
• bool tensorflow::EnvWrapper::FileExists(const string &f) override
  • Returns true iff the named file exists.
• Status tensorflow::EnvWrapper::GetChildren(const string &dir, std::vector< string > *r) override
  • Stores in *result the names of the children of the specified directory. The names are relative to "dir".
• Status tensorflow::EnvWrapper::DeleteFile(const string &f) override
  • Deletes the named file.
• Status tensorflow::EnvWrapper::CreateDir(const string &d) override
  • Creates the specified directory.
• Status tensorflow::EnvWrapper::DeleteDir(const string &d) override
  • Deletes the specified directory.
• Status tensorflow::EnvWrapper::GetFileSize(const string &f, uint64 *s) override
  • Stores the size of fname in *file_size.
• Status tensorflow::EnvWrapper::RenameFile(const string &s, const string &t) override
  • Renames file src to target. If target already exists, it will be replaced.
• uint64 tensorflow::EnvWrapper::NowMicros() override
  • Returns the number of micro-seconds since some fixed point in time. Only useful for computing deltas of time.
• void tensorflow::EnvWrapper::SleepForMicroseconds(int micros) override
  • Sleeps/delays the thread for the prescribed number of micro-seconds.
• Thread* tensorflow::EnvWrapper::StartThread(const ThreadOptions &thread_options, const string &name, std::function< void()> fn) override
  • Returns a new thread that is running fn() and is identified (for debugging/performance-analysis) by "name".

Member Details

tensorflow::EnvWrapper::EnvWrapper(Env *t)

Initializes an EnvWrapper that delegates all calls to *t.

virtual tensorflow::EnvWrapper::~EnvWrapper()

Env* tensorflow::EnvWrapper::target() const

Returns the target to which this Env forwards all calls.

Status tensorflow::EnvWrapper::NewRandomAccessFile(const string &f, RandomAccessFile **r) override

Creates a brand new random access read-only file with the specified name.

On success, stores a pointer to the new file in result and returns OK. On failure stores NULL in result and returns non-OK. If the file does not exist, returns a non-OK status.

The returned file may be concurrently accessed by multiple threads.

Status tensorflow::EnvWrapper::NewWritableFile(const string &f, WritableFile **r) override

Creates an object that writes to a new file with the specified name.

Deletes any existing file with the same name and creates a new file. On success, stores a pointer to the new file in result and returns OK. On failure stores NULL in result and returns non-OK.

The returned file will only be accessed by one thread at a time.

Status tensorflow::EnvWrapper::NewAppendableFile(const string &f, WritableFile **r) override

Creates an object that either appends to an existing file, or writes to a new file (if the file does not exist to begin with).

On success, stores a pointer to the new file in result and returns OK. On failure stores NULL in result and returns non-OK.

The returned file will only be accessed by one thread at a time.

bool tensorflow::EnvWrapper::FileExists(const string &f) override

Returns true iff the named file exists.

Status tensorflow::EnvWrapper::GetChildren(const string &dir, std::vector< string > *r) override

Stores in *result the names of the children of the specified directory. The names are relative to "dir".

Original contents of *results are dropped.

Status tensorflow::EnvWrapper::DeleteFile(const string &f) override

Deletes the named file.

Status tensorflow::EnvWrapper::CreateDir(const string &d) override

Creates the specified directory.

Status tensorflow::EnvWrapper::DeleteDir(const string &d) override

Deletes the specified directory.

Status tensorflow::EnvWrapper::GetFileSize(const string &f, uint64 *s) override

Stores the size of fname in *file_size.

Status tensorflow::EnvWrapper::RenameFile(const string &s, const string &t) override

Renames file src to target. If target already exists, it will be replaced.

uint64 tensorflow::EnvWrapper::NowMicros() override

Returns the number of micro-seconds since some fixed point in time. Only useful for computing deltas of time.

void tensorflow::EnvWrapper::SleepForMicroseconds(int micros) override

Sleeps/delays the thread for the prescribed number of micro-seconds.

Thread* tensorflow::EnvWrapper::StartThread(const ThreadOptions &thread_options, const string &name, std::function< void()> fn) override

Returns a new thread that is running fn() and is identified (for debugging/performance-analysis) by "name".

Caller takes ownership of the result and must delete it eventually (the deletion will block until fn() stops running).