1
    2
    3
    4
    5
    6
    7
    8
    9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92


base / files / file_path_watcher.cc [blame]

// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Cross platform methods for FilePathWatcher. See the various platform
// specific implementation files, too.

#include "base/files/file_path_watcher.h"

#include <memory>
#include <utility>

#include "base/check.h"
#include "base/files/file_path.h"
#include "build/build_config.h"

namespace base {

FilePathWatcher::~FilePathWatcher() {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  impl_->Cancel();
}

// static
bool FilePathWatcher::RecursiveWatchAvailable() {
#if BUILDFLAG(IS_MAC) || BUILDFLAG(IS_WIN) || BUILDFLAG(IS_LINUX) ||        \
    BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_ANDROID) || BUILDFLAG(IS_AIX) || \
    BUILDFLAG(IS_FUCHSIA)
  return true;
#else
  // FSEvents isn't available on iOS.
  return false;
#endif
}

FilePathWatcher::PlatformDelegate::PlatformDelegate() = default;

FilePathWatcher::PlatformDelegate::~PlatformDelegate() {
  DCHECK(is_cancelled());
}

bool FilePathWatcher::Watch(const FilePath& path,
                            Type type,
                            const Callback& callback) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  DCHECK(path.IsAbsolute());
  return impl_->Watch(path, type, callback);
}

bool FilePathWatcher::WatchWithOptions(const FilePath& path,
                                       const WatchOptions& options,
                                       const Callback& callback) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  DCHECK(path.IsAbsolute());
  return impl_->WatchWithOptions(path, options, callback);
}

bool FilePathWatcher::WatchWithChangeInfo(
    const FilePath& path,
    const WatchOptions& options,
    const CallbackWithChangeInfo& callback) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  DCHECK(path.IsAbsolute());
  return impl_->WatchWithChangeInfo(path, options, callback);
}

bool FilePathWatcher::PlatformDelegate::WatchWithOptions(
    const FilePath& path,
    const WatchOptions& options,
    const Callback& callback) {
  return Watch(path, options.type, callback);
}

bool FilePathWatcher::PlatformDelegate::WatchWithChangeInfo(
    const FilePath& path,
    const WatchOptions& options,
    const CallbackWithChangeInfo& callback) {
  return Watch(path, options.type, base::BindRepeating(callback, ChangeInfo()));
}

FilePathWatcher::FilePathWatcher(std::unique_ptr<PlatformDelegate> delegate) {
  DETACH_FROM_SEQUENCE(sequence_checker_);
  impl_ = std::move(delegate);
}

#if BUILDFLAG(IS_WIN)
Lock& FilePathWatcher::GetWatchThreadLockForTest() {
  return impl_->GetWatchThreadLockForTest();  // IN-TEST
}
#endif

}  // namespace base