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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_MEDIA_MEDIA_INTERNALS_PROXY_H_
#define CONTENT_BROWSER_MEDIA_MEDIA_INTERNALS_PROXY_H_
#include <string>
#include "base/memory/ref_counted.h"
#include "base/task/sequenced_task_runner_helpers.h"
#include "content/browser/media/media_internals.h"
#include "content/public/browser/browser_thread.h"
namespace content {
class MediaInternalsMessageHandler;
// This class is a proxy between MediaInternals (on the IO thread) and
// MediaInternalsMessageHandler (on the UI thread).
// It is ref_counted to ensure that it completes all pending Tasks on both
// threads before destruction.
class MediaInternalsProxy
: public base::RefCountedThreadSafe<MediaInternalsProxy,
BrowserThread::DeleteOnUIThread> {
public:
MediaInternalsProxy();
MediaInternalsProxy(const MediaInternalsProxy&) = delete;
MediaInternalsProxy& operator=(const MediaInternalsProxy&) = delete;
// Register a Handler and start receiving callbacks from MediaInternals.
void Attach(MediaInternalsMessageHandler* handler);
// Unregister the same and stop receiving callbacks.
void Detach();
// Have MediaInternals send all the data it has.
void GetEverything();
private:
friend struct BrowserThread::DeleteOnThread<BrowserThread::UI>;
friend class base::DeleteHelper<MediaInternalsProxy>;
virtual ~MediaInternalsProxy();
void GetEverythingOnIOThread();
// Callback for MediaInternals to update. Must be called on UI thread.
static void UpdateUIOnUIThread(MediaInternalsMessageHandler* handler,
const std::u16string& update);
MediaInternals::UpdateCallback update_callback_;
};
} // namespace content
#endif // CONTENT_BROWSER_MEDIA_MEDIA_INTERNALS_PROXY_H_
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