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Side by Side Diff: mojo/edk/system/message_in_transit_queue.h

Issue 814543006: Move //mojo/{public, edk} underneath //third_party (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Rebase Created 5 years, 11 months ago
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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.
4
5 #ifndef MOJO_EDK_SYSTEM_MESSAGE_IN_TRANSIT_QUEUE_H_
6 #define MOJO_EDK_SYSTEM_MESSAGE_IN_TRANSIT_QUEUE_H_
7
8 #include <deque>
9
10 #include "base/macros.h"
11 #include "base/memory/scoped_ptr.h"
12 #include "mojo/edk/system/message_in_transit.h"
13 #include "mojo/edk/system/system_impl_export.h"
14
15 namespace mojo {
16 namespace system {
17
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 {
22 public:
23 MessageInTransitQueue();
24 ~MessageInTransitQueue();
25
26 bool IsEmpty() const { return queue_.empty(); }
27
28 void AddMessage(scoped_ptr<MessageInTransit> message) {
29 queue_.push_back(message.release());
30 }
31
32 scoped_ptr<MessageInTransit> GetMessage() {
33 MessageInTransit* rv = queue_.front();
34 queue_.pop_front();
35 return make_scoped_ptr(rv);
36 }
37
38 MessageInTransit* PeekMessage() { return queue_.front(); }
39
40 void DiscardMessage() {
41 delete queue_.front();
42 queue_.pop_front();
43 }
44
45 void Clear();
46
47 // Efficiently swaps contents with |*other|.
48 void Swap(MessageInTransitQueue* other);
49
50 private:
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_;
54
55 DISALLOW_COPY_AND_ASSIGN(MessageInTransitQueue);
56 };
57
58 } // namespace system
59 } // namespace mojo
60
61 #endif // MOJO_EDK_SYSTEM_MESSAGE_IN_TRANSIT_QUEUE_H_
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