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// Copyright (c) 2011 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.
// Some basic utilities for aiding in the management of Tasks and Callbacks.
//
// AutoCallbackRunner is akin to scoped_ptr for callbacks. It is useful for
// ensuring a callback is executed and delete in the face of multiple return
// points in a function.
//
// TaskToCallbackAdapter converts a Task to a Callback0::Type since the two type
// hierarchies are strangely separate.
//
// CleanupCallback wraps another Callback and provides the ability to register
// objects for deletion as well as cleanup tasks that will be run on the
// callback's destruction. The deletion and cleanup tasks will be run on
// whatever thread the CleanupCallback is destroyed in.
#ifndef MEDIA_BASE_CALLBACK_
#define MEDIA_BASE_CALLBACK_
#include <vector>
#include "base/callback_old.h"
#include "base/memory/scoped_ptr.h"
#include "base/task.h"
namespace media {
class AutoCallbackRunner {
public:
// Takes ownership of the callback.
explicit AutoCallbackRunner(Callback0::Type* callback)
: callback_(callback) {
}
~AutoCallbackRunner();
Callback0::Type* release() { return callback_.release(); }
private:
scoped_ptr<Callback0::Type> callback_;
DISALLOW_COPY_AND_ASSIGN(AutoCallbackRunner);
};
class TaskToCallbackAdapter : public Callback0::Type {
public:
static Callback0::Type* NewCallback(Task* task);
virtual ~TaskToCallbackAdapter();
virtual void RunWithParams(const Tuple0& params);
private:
TaskToCallbackAdapter(Task* task);
scoped_ptr<Task> task_;
DISALLOW_COPY_AND_ASSIGN(TaskToCallbackAdapter);
};
} // namespace media
#endif // MEDIA_BASE_CALLBACK_
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