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-/*
- * libjingle
- * Copyright 2004--2005, Google Inc.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
- * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef TALK_BASE_MESSAGEQUEUE_H__
-#define TALK_BASE_MESSAGEQUEUE_H__
-
-#include <vector>
-#include <queue>
-#include <algorithm>
-#include "talk/base/basictypes.h"
-#include "talk/base/criticalsection.h"
-#include "talk/base/scoped_ptr.h"
-#include "talk/base/socketserver.h"
-#include "talk/base/time.h"
-
-namespace talk_base {
-
-struct Message;
-class MessageQueue;
-class MessageHandler;
-
-// MessageQueueManager does cleanup of of message queues
-
-class MessageQueueManager {
-public:
- static MessageQueueManager* Instance();
-
- void Add(MessageQueue *message_queue);
- void Remove(MessageQueue *message_queue);
- void Clear(MessageHandler *handler);
-
-private:
- MessageQueueManager();
- ~MessageQueueManager();
-
- static MessageQueueManager* instance_;
- // This list contains 'active' MessageQueues.
- std::vector<MessageQueue *> message_queues_;
- CriticalSection crit_;
-};
-
-// Messages get dispatched to a MessageHandler
-
-class MessageHandler {
-public:
- virtual ~MessageHandler() {
- MessageQueueManager::Instance()->Clear(this);
- }
-
- virtual void OnMessage(Message *pmsg) = 0;
-};
-
-// Derive from this for specialized data
-// App manages lifetime, except when messages are purged
-
-class MessageData {
-public:
- MessageData() {}
- virtual ~MessageData() {}
-};
-
-template <class T>
-class TypedMessageData : public MessageData {
-public:
- TypedMessageData(const T& data) : data_(data) { }
- const T& data() const { return data_; }
- T& data() { return data_; }
-private:
- T data_;
-};
-
-template<class T>
-inline MessageData* WrapMessageData(const T& data) {
- return new TypedMessageData<T>(data);
-}
-
-template<class T>
-inline const T& UseMessageData(MessageData* data) {
- return static_cast< TypedMessageData<T>* >(data)->data();
-}
-
-template<class T>
-class DisposeData : public MessageData {
-public:
- DisposeData(T* data) : data_(data) { }
- virtual ~DisposeData() { delete data_; }
-private:
- T* data_;
-};
-
-const uint32 MQID_ANY = static_cast<uint32>(-1);
-const uint32 MQID_DISPOSE = static_cast<uint32>(-2);
-
-// No destructor
-
-struct Message {
- Message() {
- memset(this, 0, sizeof(*this));
- }
- MessageHandler *phandler;
- uint32 message_id;
- MessageData *pdata;
- uint32 ts_sensitive;
-};
-
-// DelayedMessage goes into a priority queue, sorted by trigger time
-
-class DelayedMessage {
-public:
- DelayedMessage(int cmsDelay, Message *pmsg) {
- cmsDelay_ = cmsDelay;
- msTrigger_ = GetMillisecondCount() + cmsDelay;
- msg_ = *pmsg;
- }
-
- bool operator< (const DelayedMessage& dmsg) const {
- return dmsg.msTrigger_ < msTrigger_;
- }
-
- int cmsDelay_; // for debugging
- uint32 msTrigger_;
- Message msg_;
-};
-
-class MessageQueue {
-public:
- MessageQueue(SocketServer* ss = 0);
- virtual ~MessageQueue();
-
- SocketServer* socketserver() { return ss_; }
- void set_socketserver(SocketServer* ss);
-
- // Note: The behavior of MessageQueue has changed. When a MQ is stopped,
- // futher Posts and Sends will fail. However, any pending Sends and *ready*
- // Posts (as opposed to unexpired delayed Posts) will be delivered before
- // Get (or Peek) returns false. By guaranteeing delivery of those messages,
- // we eliminate the race condition when an MessageHandler and MessageQueue
- // may be destroyed independently of each other.
- virtual void Quit();
- virtual bool IsQuitting();
- virtual void Restart();
-
- // Get() will process I/O until:
- // 1) A message is available (returns true)
- // 2) cmsWait seconds have elapsed (returns false)
- // 3) Stop() is called (returns false)
- virtual bool Get(Message *pmsg, int cmsWait = kForever);
- virtual bool Peek(Message *pmsg, int cmsWait = 0);
- virtual void Post(MessageHandler *phandler, uint32 id = 0,
- MessageData *pdata = NULL, bool time_sensitive = false);
- virtual void PostDelayed(int cmsDelay, MessageHandler *phandler,
- uint32 id = 0, MessageData *pdata = NULL);
- virtual void Clear(MessageHandler *phandler, uint32 id = MQID_ANY);
- virtual void Dispatch(Message *pmsg);
- virtual void ReceiveSends();
- virtual int GetDelay();
-
- // Internally posts a message which causes the doomed object to be deleted
- template<class T> void Dispose(T* doomed) {
- if (doomed) {
- Post(NULL, MQID_DISPOSE, new talk_base::DisposeData<T>(doomed));
- }
- }
-
- // When this signal is sent out, any references to this queue should
- // no longer be used.
- sigslot::signal0<> SignalQueueDestroyed;
-
-protected:
- void EnsureActive();
-
- SocketServer* ss_;
- // If a server isn't supplied in the constructor, use this one.
- scoped_ptr<SocketServer> default_ss_;
- bool new_ss;
- bool fStop_;
- bool fPeekKeep_;
- Message msgPeek_;
- // A message queue is active if it has ever had a message posted to it.
- // This also corresponds to being in MessageQueueManager's global list.
- bool active_;
- std::queue<Message> msgq_;
- std::priority_queue<DelayedMessage> dmsgq_;
- CriticalSection crit_;
-};
-
-} // namespace talk_base
-
-#endif // TALK_BASE_MESSAGEQUEUE_H__