henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 1 | /* |
| 2 | * libjingle |
| 3 | * Copyright 2004--2005, Google Inc. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions are met: |
| 7 | * |
| 8 | * 1. Redistributions of source code must retain the above copyright notice, |
| 9 | * this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
| 11 | * this list of conditions and the following disclaimer in the documentation |
| 12 | * and/or other materials provided with the distribution. |
| 13 | * 3. The name of the author may not be used to endorse or promote products |
| 14 | * derived from this software without specific prior written permission. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 17 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 18 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
| 19 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 20 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 21 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| 22 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 23 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| 24 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| 25 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 26 | */ |
| 27 | |
| 28 | #ifndef TALK_BASE_MESSAGEHANDLER_H_ |
| 29 | #define TALK_BASE_MESSAGEHANDLER_H_ |
| 30 | |
| 31 | #include "talk/base/constructormagic.h" |
| 32 | |
| 33 | namespace talk_base { |
| 34 | |
| 35 | struct Message; |
| 36 | |
| 37 | // Messages get dispatched to a MessageHandler |
| 38 | |
| 39 | class MessageHandler { |
| 40 | public: |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 41 | virtual ~MessageHandler(); |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 42 | virtual void OnMessage(Message* msg) = 0; |
| 43 | |
| 44 | protected: |
| 45 | MessageHandler() {} |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 46 | |
| 47 | private: |
| 48 | DISALLOW_COPY_AND_ASSIGN(MessageHandler); |
| 49 | }; |
| 50 | |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 51 | // Helper class to facilitate executing a functor on a thread. |
| 52 | template <class ReturnT, class FunctorT> |
| 53 | class FunctorMessageHandler : public MessageHandler { |
| 54 | public: |
| 55 | explicit FunctorMessageHandler(const FunctorT& functor) |
| 56 | : functor_(functor) {} |
| 57 | virtual void OnMessage(Message* msg) { |
| 58 | result_ = functor_(); |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 59 | } |
| 60 | const ReturnT& result() const { return result_; } |
henrike@webrtc.org | 54caffd | 2014-02-14 23:38:45 +0000 | [diff] [blame] | 61 | |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 62 | private: |
| 63 | FunctorT functor_; |
| 64 | ReturnT result_; |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 65 | }; |
| 66 | |
| 67 | // Specialization for ReturnT of void. |
| 68 | template <class FunctorT> |
| 69 | class FunctorMessageHandler<void, FunctorT> : public MessageHandler { |
| 70 | public: |
| 71 | explicit FunctorMessageHandler(const FunctorT& functor) |
| 72 | : functor_(functor) {} |
| 73 | virtual void OnMessage(Message* msg) { |
| 74 | functor_(); |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 75 | } |
| 76 | void result() const {} |
henrike@webrtc.org | 54caffd | 2014-02-14 23:38:45 +0000 | [diff] [blame] | 77 | |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 78 | private: |
| 79 | FunctorT functor_; |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 80 | }; |
| 81 | |
| 82 | |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 83 | } // namespace talk_base |
| 84 | |
| 85 | #endif // TALK_BASE_MESSAGEHANDLER_H_ |