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-rw-r--r--chrome/browser/file_watcher.h66
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diff --git a/chrome/browser/file_watcher.h b/chrome/browser/file_watcher.h
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-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// This module provides a way to monitor a file for changes.
-
-#ifndef CHROME_BROWSER_FILE_WATCHER_H_
-#define CHROME_BROWSER_FILE_WATCHER_H_
-#pragma once
-
-#include "base/basictypes.h"
-#include "base/ref_counted.h"
-#include "chrome/browser/chrome_thread.h"
-
-class FilePath;
-
-// This class lets you register interest in changes on a file. The delegate
-// will get called whenever the file is changed, including created or deleted.
-// WARNING: To be able to get create/delete notifications and to work cross
-// platform, we actually listen for changes to the directory containing
-// the file.
-// WARNING: On OSX and Windows, the OS API doesn't tell us which file in the
-// directory changed. We work around this by watching the file time, but this
-// can result in some extra notifications if we get other notifications within
-// 2s of the file having changed.
-class FileWatcher {
- public:
- // Declares the callback client code implements to receive notifications. Note
- // that implementations of this interface should not keep a reference to the
- // corresponding FileWatcher object to prevent a reference cycle.
- class Delegate : public base::RefCountedThreadSafe<Delegate> {
- public:
- virtual ~Delegate() {}
- virtual void OnFileChanged(const FilePath& path) = 0;
- };
-
- FileWatcher();
- ~FileWatcher() {}
-
- // Register interest in any changes on the file |path|.
- // OnFileChanged will be called back for each change to the file. Any
- // background operations will be ran on |backend_thread_id|. Note: The
- // directory containing |path| must exist before you try to watch the file.
- // Returns false if the watch can't be added.
- bool Watch(const FilePath& path, Delegate* delegate) {
- DCHECK(ChromeThread::CurrentlyOn(ChromeThread::FILE));
- return impl_->Watch(path, delegate);
- }
-
- // Used internally to encapsulate different members on different platforms.
- class PlatformDelegate
- : public base::RefCountedThreadSafe<PlatformDelegate,
- ChromeThread::DeleteOnFileThread> {
- public:
- virtual ~PlatformDelegate() {}
-
- virtual bool Watch(const FilePath& path, Delegate* delegate) = 0;
- };
-
- private:
- scoped_refptr<PlatformDelegate> impl_;
-
- DISALLOW_COPY_AND_ASSIGN(FileWatcher);
-};
-
-#endif // CHROME_BROWSER_FILE_WATCHER_H_