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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 BASE_FILE_WATCHER_H_
#define BASE_FILE_WATCHER_H_
#include "base/basictypes.h"
#include "base/ref_counted.h"
class FilePath;
class MessageLoop;
// 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:
class 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_loop|, or inside Watch
// if |backend_loop| is NULL. Note: The directory containing |path| must
// exist before you try to watch the file.
// Returns false on error.
bool Watch(const FilePath& path, Delegate* delegate,
MessageLoop* backend_loop) {
return impl_->Watch(path, delegate, backend_loop);
}
// Used internally to encapsulate different members on different platforms.
class PlatformDelegate : public base::RefCounted<PlatformDelegate> {
public:
virtual bool Watch(const FilePath& path, Delegate* delegate,
MessageLoop* backend_loop) = 0;
protected:
friend class base::RefCounted<PlatformDelegate>;
virtual ~PlatformDelegate() {}
};
private:
scoped_refptr<PlatformDelegate> impl_;
DISALLOW_COPY_AND_ASSIGN(FileWatcher);
};
#endif // BASE_FILE_WATCHER_H_
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