| // Copyright 2014 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_EDK_SYSTEM_MESSAGE_IN_TRANSIT_QUEUE_H_ |
| #define MOJO_EDK_SYSTEM_MESSAGE_IN_TRANSIT_QUEUE_H_ |
| |
| #include <deque> |
| |
| #include "base/memory/scoped_ptr.h" |
| #include "mojo/edk/system/message_in_transit.h" |
| #include "mojo/edk/system/system_impl_export.h" |
| #include "mojo/public/cpp/system/macros.h" |
| |
| namespace mojo { |
| namespace system { |
| |
| // A simple queue for |MessageInTransit|s (that owns its messages). |
| // This class is not thread-safe. |
| class MOJO_SYSTEM_IMPL_EXPORT MessageInTransitQueue { |
| public: |
| MessageInTransitQueue(); |
| ~MessageInTransitQueue(); |
| |
| bool IsEmpty() const { return queue_.empty(); } |
| size_t Size() const { return queue_.size(); } |
| |
| void AddMessage(scoped_ptr<MessageInTransit> message) { |
| queue_.push_back(message.release()); |
| } |
| |
| scoped_ptr<MessageInTransit> GetMessage() { |
| MessageInTransit* rv = queue_.front(); |
| queue_.pop_front(); |
| return make_scoped_ptr(rv); |
| } |
| |
| const MessageInTransit* PeekMessage() const { return queue_.front(); } |
| MessageInTransit* PeekMessage() { return queue_.front(); } |
| |
| void DiscardMessage() { |
| delete queue_.front(); |
| queue_.pop_front(); |
| } |
| |
| void Clear(); |
| |
| // Efficiently swaps contents with |*other|. |
| void Swap(MessageInTransitQueue* other); |
| |
| private: |
| // TODO(vtl): When C++11 is available, switch this to a deque of |
| // |scoped_ptr|/|unique_ptr|s. |
| std::deque<MessageInTransit*> queue_; |
| |
| MOJO_DISALLOW_COPY_AND_ASSIGN(MessageInTransitQueue); |
| }; |
| |
| } // namespace system |
| } // namespace mojo |
| |
| #endif // MOJO_EDK_SYSTEM_MESSAGE_IN_TRANSIT_QUEUE_H_ |