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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 BASE_MESSAGE_LOOP_MESSAGE_LOOP_PROXY_IMPL_H_
#define BASE_MESSAGE_LOOP_MESSAGE_LOOP_PROXY_IMPL_H_
#include "base/base_export.h"
#include "base/message_loop/message_loop.h"
#include "base/message_loop/message_loop_proxy.h"
#include "base/synchronization/lock.h"
namespace base {
// A stock implementation of MessageLoopProxy that is created and managed by a
// MessageLoop. For now a MessageLoopProxyImpl can only be created as part of a
// MessageLoop.
class BASE_EXPORT MessageLoopProxyImpl : public MessageLoopProxy {
public:
// MessageLoopProxy implementation
virtual bool PostDelayedTask(const tracked_objects::Location& from_here,
const base::Closure& task,
base::TimeDelta delay) OVERRIDE;
virtual bool PostNonNestableDelayedTask(
const tracked_objects::Location& from_here,
const base::Closure& task,
base::TimeDelta delay) OVERRIDE;
virtual bool RunsTasksOnCurrentThread() const OVERRIDE;
protected:
virtual ~MessageLoopProxyImpl();
// Override OnDestruct so that we can delete the object on the target message
// loop if it still exists.
virtual void OnDestruct() const OVERRIDE;
private:
// Allow the MessageLoop to create a MessageLoopProxyImpl.
friend class MessageLoop;
friend class DeleteHelper<MessageLoopProxyImpl>;
MessageLoopProxyImpl();
// Called directly by MessageLoop::~MessageLoop.
virtual void WillDestroyCurrentMessageLoop();
bool PostTaskHelper(const tracked_objects::Location& from_here,
const base::Closure& task,
base::TimeDelta delay,
bool nestable);
// The lock that protects access to target_message_loop_.
mutable base::Lock message_loop_lock_;
MessageLoop* target_message_loop_;
DISALLOW_COPY_AND_ASSIGN(MessageLoopProxyImpl);
};
} // namespace base
#endif // BASE_MESSAGE_LOOP_MESSAGE_LOOP_PROXY_IMPL_H_
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