1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef MOJO_SYSTEM_MESSAGE_QUEUE_H_
6 #define MOJO_SYSTEM_MESSAGE_QUEUE_H_
10 #include "base/macros.h"
11 #include "base/memory/scoped_ptr.h"
12 #include "mojo/system/message_in_transit.h"
13 #include "mojo/system/system_impl_export.h"
18 // A simple queue for |MessageInTransit|s (that owns its messages).
19 // This class is not thread-safe.
20 // TODO(vtl): Write tests.
21 class MOJO_SYSTEM_IMPL_EXPORT MessageInTransitQueue {
23 MessageInTransitQueue();
24 ~MessageInTransitQueue();
26 bool IsEmpty() const { return queue_.empty(); }
28 void AddMessage(scoped_ptr<MessageInTransit> message) {
29 queue_.push_back(message.release());
32 scoped_ptr<MessageInTransit> GetMessage() {
33 MessageInTransit* rv = queue_.front();
35 return make_scoped_ptr(rv);
38 MessageInTransit* PeekMessage() { return queue_.front(); }
40 void DiscardMessage() {
41 delete queue_.front();
47 // Efficiently swaps contents with |*other|.
48 void Swap(MessageInTransitQueue* other);
51 // TODO(vtl): When C++11 is available, switch this to a deque of
52 // |scoped_ptr|/|unique_ptr|s.
53 std::deque<MessageInTransit*> queue_;
55 DISALLOW_COPY_AND_ASSIGN(MessageInTransitQueue);
61 #endif // MOJO_SYSTEM_MESSAGE_QUEUE_H_