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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.
// ChromeThreadRelay provides a convenient way to bounce work to a specific
// ChromeThread and then return results back to the originating thread.
//
// EXAMPLE:
//
// class MyRelay : public ChromeThreadRelay {
// public:
// MyRelay(const Params& params) : params_(params) {
// }
// protected:
// virtual void RunWork() {
// results_ = DoWork(params_);
// }
// virtual void RunCallback() {
// ... use results_ on the originating thread ...
// }
// private:
// Params params_;
// Results_ results_;
// };
#ifndef CHROME_BROWSER_CHROME_THREAD_RELAY_H_
#define CHROME_BROWSER_CHROME_THREAD_RELAY_H_
#include "base/ref_counted.h"
#include "chrome/browser/chrome_thread.h"
class ChromeThreadRelay
: public base::RefCountedThreadSafe<ChromeThreadRelay> {
public:
ChromeThreadRelay();
void Start(ChromeThread::ID target_thread_id,
const tracked_objects::Location& from_here);
protected:
friend class base::RefCountedThreadSafe<ChromeThreadRelay>;
virtual ~ChromeThreadRelay() {}
// Called to perform work on the FILE thread.
virtual void RunWork() = 0;
// Called to notify the callback on the origin thread.
virtual void RunCallback() = 0;
private:
void ProcessOnTargetThread();
ChromeThread::ID origin_thread_id_;
};
#endif // CHROME_BROWSER_CHROME_THREAD_RELAY_H_
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