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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.
#ifndef BASE_MESSAGE_LOOP_PROXY_IMPL_H_
#define BASE_MESSAGE_LOOP_PROXY_IMPL_H_
#pragma once
#include "base/base_api.h"
#include "base/message_loop.h"
#include "base/message_loop_proxy.h"
#include "base/synchronization/lock.h"
namespace base {
// A stock implementation of MessageLoopProxy that takes in a MessageLoop
// and keeps track of its lifetime using the MessageLoop DestructionObserver.
// For now a MessageLoopProxyImpl can only be created for the current thread.
class BASE_API MessageLoopProxyImpl : public MessageLoopProxy,
public MessageLoop::DestructionObserver {
public:
virtual ~MessageLoopProxyImpl();
// MessageLoopProxy implementation
virtual bool PostTask(const tracked_objects::Location& from_here,
Task* task);
virtual bool PostDelayedTask(const tracked_objects::Location& from_here,
Task* task, int64 delay_ms);
virtual bool PostNonNestableTask(const tracked_objects::Location& from_here,
Task* task);
virtual bool PostNonNestableDelayedTask(
const tracked_objects::Location& from_here,
Task* task,
int64 delay_ms);
virtual bool BelongsToCurrentThread();
// MessageLoop::DestructionObserver implementation
virtual void WillDestroyCurrentMessageLoop();
protected:
// Override OnDestruct so that we can delete the object on the target message
// loop if it still exists.
virtual void OnDestruct() const;
private:
MessageLoopProxyImpl();
bool PostTaskHelper(const tracked_objects::Location& from_here,
Task* task, int64 delay_ms, bool nestable);
// For the factory method to work
friend class MessageLoopProxy;
// 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_PROXY_IMPL_H_
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