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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 Stop();
+  virtual bool IsStopping();
+  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));
+    }
+  }
+
+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__