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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 JINGLE_GLUE_THREAD_WRAPPER_H_
#define JINGLE_GLUE_THREAD_WRAPPER_H_
#include <list>
#include <map>
#include "base/compiler_specific.h"
#include "base/message_loop/message_loop.h"
#include "base/synchronization/lock.h"
#include "base/synchronization/waitable_event.h"
#include "third_party/libjingle/source/talk/base/thread.h"
namespace jingle_glue {
// JingleThreadWrapper implements talk_base::Thread interface on top of
// Chromium's SingleThreadTaskRunner interface. Currently only the bare minimum
// that is used by P2P part of libjingle is implemented. There are two ways to
// create this object:
//
// - Call EnsureForCurrentMessageLoop(). This approach works only on threads
// that have MessageLoop In this case JingleThreadWrapper deletes itself
// automatically when MessageLoop is destroyed.
// - Using JingleThreadWrapper() constructor. In this case the creating code
// must pass a valid task runner for the current thread and also delete the
// wrapper later.
class JingleThreadWrapper : public base::MessageLoop::DestructionObserver,
public talk_base::Thread {
public:
// Create JingleThreadWrapper for the current thread if it hasn't been created
// yet. The thread wrapper is destroyed automatically when the current
// MessageLoop is destroyed.
static void EnsureForCurrentMessageLoop();
// Returns thread wrapper for the current thread. NULL is returned
// if EnsureForCurrentMessageLoop() has never been called for this
// thread.
static JingleThreadWrapper* current();
explicit JingleThreadWrapper(
scoped_refptr<base::SingleThreadTaskRunner> task_runner);
virtual ~JingleThreadWrapper();
// Sets whether the thread can be used to send messages
// synchronously to another thread using Send() method. Set to false
// by default to avoid potential jankiness when Send() used on
// renderer thread. It should be set explicitly for threads that
// need to call Send() for other threads.
void set_send_allowed(bool allowed) { send_allowed_ = allowed; }
// MessageLoop::DestructionObserver implementation.
virtual void WillDestroyCurrentMessageLoop() OVERRIDE;
// talk_base::MessageQueue overrides.
virtual void Post(talk_base::MessageHandler *phandler,
uint32 id,
talk_base::MessageData *pdata,
bool time_sensitive) OVERRIDE;
virtual void PostDelayed(int delay_ms,
talk_base::MessageHandler* handler,
uint32 id,
talk_base::MessageData* data) OVERRIDE;
virtual void Clear(talk_base::MessageHandler* handler,
uint32 id,
talk_base::MessageList* removed) OVERRIDE;
virtual void Send(talk_base::MessageHandler *handler,
uint32 id,
talk_base::MessageData *data) OVERRIDE;
// Following methods are not supported.They are overriden just to
// ensure that they are not called (each of them contain NOTREACHED
// in the body). Some of this methods can be implemented if it
// becomes neccessary to use libjingle code that calls them.
virtual void Quit() OVERRIDE;
virtual bool IsQuitting() OVERRIDE;
virtual void Restart() OVERRIDE;
virtual bool Get(talk_base::Message* message,
int delay_ms,
bool process_io) OVERRIDE;
virtual bool Peek(talk_base::Message* message,
int delay_ms) OVERRIDE;
virtual void PostAt(uint32 timestamp,
talk_base::MessageHandler* handler,
uint32 id,
talk_base::MessageData* data) OVERRIDE;
virtual void Dispatch(talk_base::Message* message) OVERRIDE;
virtual void ReceiveSends() OVERRIDE;
virtual int GetDelay() OVERRIDE;
// talk_base::Thread overrides.
virtual void Stop() OVERRIDE;
virtual void Run() OVERRIDE;
private:
typedef std::map<int, talk_base::Message> MessagesQueue;
struct PendingSend;
void PostTaskInternal(
int delay_ms, talk_base::MessageHandler* handler,
uint32 message_id, talk_base::MessageData* data);
void RunTask(int task_id);
void ProcessPendingSends();
// Task runner used to execute messages posted on this thread.
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
bool send_allowed_;
// |lock_| must be locked when accessing |messages_|.
base::Lock lock_;
int last_task_id_;
MessagesQueue messages_;
std::list<PendingSend*> pending_send_messages_;
base::WaitableEvent pending_send_event_;
base::WeakPtrFactory<JingleThreadWrapper> weak_ptr_factory_;
base::WeakPtr<JingleThreadWrapper> weak_ptr_;
DISALLOW_COPY_AND_ASSIGN(JingleThreadWrapper);
};
} // namespace jingle_glue
#endif // JINGLE_GLUE_THREAD_WRAPPER_H_
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