?����jeȸ�'7���I��� � The reactor design pattern is an event handling pattern for handling service requests delivered concurrently to a service handler by one or more inputs.
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0000039260 00000 n The service handler then demultiplexes the incoming requests and dispatches them synchronously to the associated request handlers.
Reactor 和 Proactor 是基于事件驱动，在网络编程中经常用到两种设计模式。 曾经在一个项目中用到了网络库 libevent，也学习了一段时间，其内部实现所用到的就是 Reactor，所知道的还有 ACE；Proactor 模式的库有 Boost.Asio，ACE，暂时没有用过。 The first pattern can be applied to develop synchronous service providers: 0000020301 00000 n 0000004333 00000 n In the Proactor pattern, application components--represented by clients and completion handlers--are Other patterns in the literature that address event handling include Event Notification [Rie96], Observer [GoF95], and Publisher-Subscriber [POSA1]. m��̌L �L��S]���j���,1�#�B�A��Lg��9�WЕ�[��~�����G�����7j ��F�~:�Κ�}5:��U�������k�S�����}{ˍ(a'�� i�ց When these asynchronous operations complete, the asynchronous operation processor and and a designated proactor component collaborate to demultiplex the resulting completion events to their associated completion handlers and dispatch these handlers' hook methods.
The reactor pattern itself is documentent in "Patterns for Concurrent and Networked Objects, Volume 2".
0000009054 00000 n 0000008824 00000 n When a Web browser connects to a Web server, a new event handler is created and registered with a reactor, which coordinates the synchronous de-multiplexing and dispatching of indication events.
Although the Reactor pattern is relatively straightforward to program and use, it has several constraints that can limit its applicability. Reactor pattern (a pattern that also asynchronously queues events, but demultiplexes and dispatches them synchronously) References [ edit ] ^ Pattern-Oriented Software Architecture, Volume 2, Schmidt et al., Jon Wiley & Sons, Ltd, 2000 After the browser’s HTTP GET request arrives, the reactor demultiplexes the associated `P����b���R�tq�p��B��niv l�����I�\r�lf������GE�P��z�TA�!� �(���R�S���6����&��67�,JfL6���Xl*�y�o�Qu擾 r��L����q��scNO���j�Q o0t���[K����6p��>#�~��W�0�,��\a��M�~��%�P�0B� ���L ��V��,�x����
tiplexing model in accordance with the Reactor pattern (75). When discussing the STRATEGY pattern, its relationship with the pattern preceding it in the Design Patterns [2] book deserves special mention. 0000008075 00000 n 0000010004 00000 n All four patterns presented in this chapter are often applied in conjunction with the Concurrency patterns presented in Chapter 5. �QR)��f3�m]|�oۓ�VZ����`{�#7 t���Sl14�)��w�vU��b!�o��#%K-�w��@O��Ȉ#� ��= [��vԡJ�:�˕��s`ί���c�Z�g�X��L�ݕ.�369EY@�S�� X�X�w1~��n�} 0000014757 00000 n 0000115714 00000 n 0000015897 00000 n 0000006553 00000 n 0000003287 00000 n
/v��1���0�&��2�D��\Lǂ4t����� �h�k�g'�.�I�w�N��U���������r�\r�Cj%r�ʭ) /DA (�제������q��OHj7�ں�B2�ym�r�RՀ�h��x�M���1�U�t��*��e�) /BS 557 0 R /T (7����) /NM (l�����) /P 507 0 R /AP << /N 516 0 R >> >> endobj 516 0 obj << /Length 75 /Type /XObject /Subtype /Form /FormType 1 /BBox [ -0.00015 -0.00015 129.10605 8.2092 ] /Matrix [ 1 0 0 1 0.00015 0.00015 ] /Resources << /ProcSet [ /PDF /Text ] /Font << /TiBo 511 0 R >> >> >> stream After processing a completion event, a completion handler may initiate new asynchronous operation requests proactively. The design patterns STATE [2] [4] and STRATEGY are closely related. 0000100918 00000 n
The final pattern in this chapter is often used in conjunction with the Reactor pattern for networking applications:
0000002175 00000 n
� H6����asf�v��> }s��}�9�c��B=���$Z�>�2q�ም�3�f�*g�Ǿ�k�4Q��?�U9f"�G��_�Gu�3�30�?�{���0�^��D��.X2�N� �E������t˹\� 0000138940 00000 n 0000010027 00000 n 0000001981 00000 n 0000002283 00000 n 0000016370 00000 n The next pattern is particularly useful for optimizing the demultiplexing tasks of a Proactor implementation, because it addresses an important aspect of asynchronous application design: 0000013589 00000 n 0000138733 00000 n