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// Copyright (c) 2012 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.
#ifndef NET_DNS_FILE_PATH_WATCHER_WRAPPER_H_
#define NET_DNS_FILE_PATH_WATCHER_WRAPPER_H_
#pragma once
#include <string>
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/file_path.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/threading/non_thread_safe.h"
#include "net/base/net_export.h"
namespace base {
namespace files {
class FilePathWatcher;
}
}
namespace net {
// Convenience wrapper which holds a FilePathWatcher and a
// FilePathWatcher::Delegate which forwards its calls to a Callback.
class NET_EXPORT FilePathWatcherWrapper
: NON_EXPORTED_BASE(public base::NonThreadSafe) {
public:
FilePathWatcherWrapper();
// When deleted, automatically cancels the FilePathWatcher.
virtual ~FilePathWatcherWrapper();
// Starts watching the file at |path|. Returns true if Watch succeeds.
// If so, |callback| will be called with true on change and false on error.
// After failure the watch is cancelled and will have to be restarted.
bool Watch(const FilePath& path,
const base::Callback<void(bool succeeded)>& callback);
bool IsWatching() const;
// Cancels the current watch.
void Cancel();
protected:
// Creates a FilePathWatcher. Override to provide a different implementation.
virtual scoped_ptr<base::files::FilePathWatcher> CreateFilePathWatcher();
private:
class WatcherDelegate;
void OnFilePathChanged();
void OnFilePathError();
base::Callback<void(bool succeeded)> callback_;
scoped_ptr<base::files::FilePathWatcher> watcher_;
scoped_refptr<WatcherDelegate> delegate_;
DISALLOW_COPY_AND_ASSIGN(FilePathWatcherWrapper);
};
} // namespace net
#endif // NET_DNS_FILE_PATH_WATCHER_WRAPPER_H_
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