Mojo: bindings connector

mojo/public/bindings/lib/message_queue.h

+// Copyright 2013 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 MOJO_PUBLIC_BINDINGS_LIB_MESSAGE_QUEUE_H_
+#define MOJO_PUBLIC_BINDINGS_LIB_MESSAGE_QUEUE_H_
+
+#include <queue>
+
+#include "mojo/public/system/macros.h"
+
+namespace mojo {
+
+class Message;
+
+class MessageQueue {
+ public:
+  MessageQueue();
+  ~MessageQueue();
+
+  bool IsEmpty() const;
+  const Message* Peek() const;
+
+  // This method transfers ownership of |message->data| and |message->handles|
+  // to the message queue, resetting |message| in the process.
+  void Push(Message* message);
+
+  // Removes the next message from the queue, transferring ownership of its
+  // data and handles to the given |message|.
+  void Pop(Message* message);
+
+  // Removes the next message from the queue, discarding its data and handles.
+  // This is meant to be used in conjunction with |Peek|.
+  void Pop();
+
+ private:
+  std::queue<Message*> queue_;
+
+  MOJO_DISALLOW_COPY_AND_ASSIGN(MessageQueue);
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_PUBLIC_BINDINGS_LIB_MESSAGE_QUEUE_H_