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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #include "base/files/file_path_watcher.h" | 5 #include "base/files/file_path_watcher.h" |
| 6 | 6 |
| 7 #include "base/bind.h" | 7 #include "base/bind.h" |
| 8 #include "base/files/file.h" | 8 #include "base/files/file.h" |
| 9 #include "base/files/file_path.h" | 9 #include "base/files/file_path.h" |
| 10 #include "base/files/file_util.h" | 10 #include "base/files/file_util.h" |
| 11 #include "base/logging.h" | 11 #include "base/logging.h" |
| 12 #include "base/memory/ref_counted.h" | 12 #include "base/memory/ref_counted.h" |
| 13 #include "base/message_loop/message_loop_proxy.h" | 13 #include "base/thread_task_runner_handle.h" |
| 14 #include "base/time/time.h" | 14 #include "base/time/time.h" |
| 15 #include "base/win/object_watcher.h" | 15 #include "base/win/object_watcher.h" |
| 16 | 16 |
| 17 namespace base { | 17 namespace base { |
| 18 | 18 |
| 19 namespace { | 19 namespace { |
| 20 | 20 |
| 21 class FilePathWatcherImpl : public FilePathWatcher::PlatformDelegate, | 21 class FilePathWatcherImpl : public FilePathWatcher::PlatformDelegate, |
| 22 public base::win::ObjectWatcher::Delegate, | 22 public base::win::ObjectWatcher::Delegate, |
| 23 public MessageLoop::DestructionObserver { | 23 public MessageLoop::DestructionObserver { |
| (...skipping 26 matching lines...) Expand all Loading... |
| 50 static bool SetupWatchHandle(const FilePath& dir, | 50 static bool SetupWatchHandle(const FilePath& dir, |
| 51 bool recursive, | 51 bool recursive, |
| 52 HANDLE* handle) WARN_UNUSED_RESULT; | 52 HANDLE* handle) WARN_UNUSED_RESULT; |
| 53 | 53 |
| 54 // (Re-)Initialize the watch handle. | 54 // (Re-)Initialize the watch handle. |
| 55 bool UpdateWatch() WARN_UNUSED_RESULT; | 55 bool UpdateWatch() WARN_UNUSED_RESULT; |
| 56 | 56 |
| 57 // Destroy the watch handle. | 57 // Destroy the watch handle. |
| 58 void DestroyWatch(); | 58 void DestroyWatch(); |
| 59 | 59 |
| 60 // Cleans up and stops observing the |message_loop_| thread. | 60 // Cleans up and stops observing the |task_runner_| thread. |
| 61 void CancelOnMessageLoopThread() override; | 61 void CancelOnMessageLoopThread() override; |
| 62 | 62 |
| 63 // Callback to notify upon changes. | 63 // Callback to notify upon changes. |
| 64 FilePathWatcher::Callback callback_; | 64 FilePathWatcher::Callback callback_; |
| 65 | 65 |
| 66 // Path we're supposed to watch (passed to callback). | 66 // Path we're supposed to watch (passed to callback). |
| 67 FilePath target_; | 67 FilePath target_; |
| 68 | 68 |
| 69 // Handle for FindFirstChangeNotification. | 69 // Handle for FindFirstChangeNotification. |
| 70 HANDLE handle_; | 70 HANDLE handle_; |
| (...skipping 13 matching lines...) Expand all Loading... |
| 84 Time first_notification_; | 84 Time first_notification_; |
| 85 | 85 |
| 86 DISALLOW_COPY_AND_ASSIGN(FilePathWatcherImpl); | 86 DISALLOW_COPY_AND_ASSIGN(FilePathWatcherImpl); |
| 87 }; | 87 }; |
| 88 | 88 |
| 89 bool FilePathWatcherImpl::Watch(const FilePath& path, | 89 bool FilePathWatcherImpl::Watch(const FilePath& path, |
| 90 bool recursive, | 90 bool recursive, |
| 91 const FilePathWatcher::Callback& callback) { | 91 const FilePathWatcher::Callback& callback) { |
| 92 DCHECK(target_.value().empty()); // Can only watch one path. | 92 DCHECK(target_.value().empty()); // Can only watch one path. |
| 93 | 93 |
| 94 set_message_loop(MessageLoopProxy::current()); | 94 set_task_runner(ThreadTaskRunnerHandle::Get()); |
| 95 callback_ = callback; | 95 callback_ = callback; |
| 96 target_ = path; | 96 target_ = path; |
| 97 recursive_watch_ = recursive; | 97 recursive_watch_ = recursive; |
| 98 MessageLoop::current()->AddDestructionObserver(this); | 98 MessageLoop::current()->AddDestructionObserver(this); |
| 99 | 99 |
| 100 File::Info file_info; | 100 File::Info file_info; |
| 101 if (GetFileInfo(target_, &file_info)) { | 101 if (GetFileInfo(target_, &file_info)) { |
| 102 last_modified_ = file_info.last_modified; | 102 last_modified_ = file_info.last_modified; |
| 103 first_notification_ = Time::Now(); | 103 first_notification_ = Time::Now(); |
| 104 } | 104 } |
| 105 | 105 |
| 106 if (!UpdateWatch()) | 106 if (!UpdateWatch()) |
| 107 return false; | 107 return false; |
| 108 | 108 |
| 109 watcher_.StartWatching(handle_, this); | 109 watcher_.StartWatching(handle_, this); |
| 110 | 110 |
| 111 return true; | 111 return true; |
| 112 } | 112 } |
| 113 | 113 |
| 114 void FilePathWatcherImpl::Cancel() { | 114 void FilePathWatcherImpl::Cancel() { |
| 115 if (callback_.is_null()) { | 115 if (callback_.is_null()) { |
| 116 // Watch was never called, or the |message_loop_| has already quit. | 116 // Watch was never called, or the |task_runner_| has already quit. |
| 117 set_cancelled(); | 117 set_cancelled(); |
| 118 return; | 118 return; |
| 119 } | 119 } |
| 120 | 120 |
| 121 // Switch to the file thread if necessary so we can stop |watcher_|. | 121 // Switch to the file thread if necessary so we can stop |watcher_|. |
| 122 if (!message_loop()->BelongsToCurrentThread()) { | 122 if (!task_runner()->BelongsToCurrentThread()) { |
| 123 message_loop()->PostTask(FROM_HERE, | 123 task_runner()->PostTask(FROM_HERE, Bind(&FilePathWatcher::CancelWatch, |
| 124 Bind(&FilePathWatcher::CancelWatch, | 124 make_scoped_refptr(this))); |
| 125 make_scoped_refptr(this))); | |
| 126 } else { | 125 } else { |
| 127 CancelOnMessageLoopThread(); | 126 CancelOnMessageLoopThread(); |
| 128 } | 127 } |
| 129 } | 128 } |
| 130 | 129 |
| 131 void FilePathWatcherImpl::CancelOnMessageLoopThread() { | 130 void FilePathWatcherImpl::CancelOnMessageLoopThread() { |
| 132 DCHECK(message_loop()->BelongsToCurrentThread()); | 131 DCHECK(task_runner()->BelongsToCurrentThread()); |
| 133 set_cancelled(); | 132 set_cancelled(); |
| 134 | 133 |
| 135 if (handle_ != INVALID_HANDLE_VALUE) | 134 if (handle_ != INVALID_HANDLE_VALUE) |
| 136 DestroyWatch(); | 135 DestroyWatch(); |
| 137 | 136 |
| 138 if (!callback_.is_null()) { | 137 if (!callback_.is_null()) { |
| 139 MessageLoop::current()->RemoveDestructionObserver(this); | 138 MessageLoop::current()->RemoveDestructionObserver(this); |
| 140 callback_.Reset(); | 139 callback_.Reset(); |
| 141 } | 140 } |
| 142 } | 141 } |
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| 292 handle_ = INVALID_HANDLE_VALUE; | 291 handle_ = INVALID_HANDLE_VALUE; |
| 293 } | 292 } |
| 294 | 293 |
| 295 } // namespace | 294 } // namespace |
| 296 | 295 |
| 297 FilePathWatcher::FilePathWatcher() { | 296 FilePathWatcher::FilePathWatcher() { |
| 298 impl_ = new FilePathWatcherImpl(); | 297 impl_ = new FilePathWatcherImpl(); |
| 299 } | 298 } |
| 300 | 299 |
| 301 } // namespace base | 300 } // namespace base |
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