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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 or directory for changes.
#ifndef CHROME_BROWSER_FILE_PATH_WATCHER_H_
#define CHROME_BROWSER_FILE_PATH_WATCHER_H_
#pragma once
#include "base/basictypes.h"
#include "base/file_path.h"
#include "base/ref_counted.h"
#include "chrome/browser/browser_thread.h"
// This class lets you register interest in changes on a FilePath.
// The delegate will get called whenever the file or directory referenced by the
// FilePath is changed, including created or deleted. Due to limitations in the
// underlying OS APIs, spurious notifications might occur that don't relate to
// an actual change to the watch target.
class FilePathWatcher {
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 OnFilePathChanged(const FilePath& path) = 0;
// Called when platform specific code detected an error. The watcher will
// not call OnFilePathChanged for future changes.
virtual void OnError() {}
};
FilePathWatcher();
~FilePathWatcher();
// Register interest in any changes on |path|. OnPathChanged will be called
// back for each change. Returns true on success.
bool Watch(const FilePath& path, Delegate* delegate) WARN_UNUSED_RESULT;
// Used internally to encapsulate different members on different platforms.
class PlatformDelegate
: public base::RefCountedThreadSafe<PlatformDelegate,
BrowserThread::DeleteOnFileThread> {
public:
virtual ~PlatformDelegate() {}
// Start watching for the given |path| and notify |delegate| about changes.
virtual bool Watch(const FilePath& path, Delegate* delegate)
WARN_UNUSED_RESULT = 0;
// Stop watching. This is called from FilePathWatcher's dtor in order to
// allow to shut down properly while the object is still alive.
virtual void Cancel() {}
};
private:
scoped_refptr<PlatformDelegate> impl_;
DISALLOW_COPY_AND_ASSIGN(FilePathWatcher);
};
#endif // CHROME_BROWSER_FILE_PATH_WATCHER_H_
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