henrike@webrtc.org | f7795df | 2014-05-13 18:00:26 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2004 The WebRTC Project Authors. All rights reserved. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license |
| 5 | * that can be found in the LICENSE file in the root of the source |
| 6 | * tree. An additional intellectual property rights grant can be found |
| 7 | * in the file PATENTS. All contributing project authors may |
| 8 | * be found in the AUTHORS file in the root of the source tree. |
| 9 | */ |
| 10 | |
| 11 | #ifndef WEBRTC_BASE_MESSAGEHANDLER_H_ |
| 12 | #define WEBRTC_BASE_MESSAGEHANDLER_H_ |
| 13 | |
| 14 | #include "webrtc/base/constructormagic.h" |
| 15 | |
| 16 | namespace rtc { |
| 17 | |
| 18 | struct Message; |
| 19 | |
| 20 | // Messages get dispatched to a MessageHandler |
| 21 | |
| 22 | class MessageHandler { |
| 23 | public: |
| 24 | virtual ~MessageHandler(); |
| 25 | virtual void OnMessage(Message* msg) = 0; |
| 26 | |
| 27 | protected: |
| 28 | MessageHandler() {} |
| 29 | |
| 30 | private: |
| 31 | DISALLOW_COPY_AND_ASSIGN(MessageHandler); |
| 32 | }; |
| 33 | |
| 34 | // Helper class to facilitate executing a functor on a thread. |
| 35 | template <class ReturnT, class FunctorT> |
| 36 | class FunctorMessageHandler : public MessageHandler { |
| 37 | public: |
| 38 | explicit FunctorMessageHandler(const FunctorT& functor) |
| 39 | : functor_(functor) {} |
| 40 | virtual void OnMessage(Message* msg) { |
| 41 | result_ = functor_(); |
| 42 | } |
| 43 | const ReturnT& result() const { return result_; } |
| 44 | |
| 45 | private: |
| 46 | FunctorT functor_; |
| 47 | ReturnT result_; |
| 48 | }; |
| 49 | |
| 50 | // Specialization for ReturnT of void. |
| 51 | template <class FunctorT> |
| 52 | class FunctorMessageHandler<void, FunctorT> : public MessageHandler { |
| 53 | public: |
| 54 | explicit FunctorMessageHandler(const FunctorT& functor) |
| 55 | : functor_(functor) {} |
| 56 | virtual void OnMessage(Message* msg) { |
| 57 | functor_(); |
| 58 | } |
| 59 | void result() const {} |
| 60 | |
| 61 | private: |
| 62 | FunctorT functor_; |
| 63 | }; |
| 64 | |
| 65 | |
| 66 | } // namespace rtc |
| 67 | |
| 68 | #endif // WEBRTC_BASE_MESSAGEHANDLER_H_ |