Disruptor笔记(三)-处理模式

1.UniCast a series of items between 1 publisher and 1 EventProcessor:一个publisher 一个eventprocessor

P1  - Publisher 1

RB  - RingBuffer

SB  - SequenceBarrier

EP1 -EventProcessor 1

代码：

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1. private final RingBuffer<ValueEvent> ringBuffer =  
2.         new RingBuffer<ValueEvent>(ValueEvent.EVENT_FACTORY,  
3.                                    new SingleThreadedClaimStrategy(BUFFER_SIZE),  
4.                                    newYieldingWaitStrategy());  
5.     private final SequenceBarrier sequenceBarrier = ringBuffer.newBarrier();  
6.     private final ValueAdditionEventHandler handler = newValueAdditionEventHandler();  
7.     private finalBatchEventProcessor<ValueEvent> batchEventProcessor = new BatchEventProcessor<ValueEvent>(ringBuffer, sequenceBarrier, handler);  
8.     {  
9.         ringBuffer.setGatingSequences(batchEventProcessor.getSequence());  
10. }  

或 DSL写法

[java]  view plain copy

1. Disruptor  disruptor = new Disruptor<TestEvent>(TestEvent.EVENT_FACTORY, executor,  
2.                                              newSingleThreadedClaimStrategy(4),  
3.                                              newBlockingWaitStrategy());  
4. private final ValueAdditionEventHandler handler = new ValueAdditionEventHandler();  
5. disruptor. handleEventsWith(handler);//  
6. disruptor.start();  

2.Pipeline a series of messages

  P1  - Publisher 1

  RB  - RingBuffer

  SB1 - SequenceBarrier 1

  EP1 - EventProcessor 1

  SB2 - SequenceBarrier 2

  EP2 - EventProcessor 2

  SB3 - SequenceBarrier 3

  EP3 -EventProcessor 3

[java]  view plain copy

1. private final RingBuffer<FunctionEvent> ringBuffer =  
2.         new RingBuffer<FunctionEvent>(FunctionEvent.EVENT_FACTORY,  
3.                                       new SingleThreadedClaimStrategy(BUFFER_SIZE),  
4.                                       new YieldingWaitStrategy());  
5.   
6.     private final SequenceBarrier stepOneSequenceBarrier = ringBuffer.newBarrier();  
7.     private final FunctionEventHandler stepOneFunctionHandler = new FunctionEventHandler(FunctionStep.ONE);  
8.     private final BatchEventProcessor<FunctionEvent> stepOneBatchProcessor =  
9.         new BatchEventProcessor<FunctionEvent>(ringBuffer, stepOneSequenceBarrier, stepOneFunctionHandler);  
10.   
11.   
12.     private final SequenceBarrier stepTwoSequenceBarrier = ringBuffer.newBarrier(stepOneBatchProcessor.getSequence());  
13.     private final FunctionEventHandler stepTwoFunctionHandler = new FunctionEventHandler(FunctionStep.TWO);  
14.     private final BatchEventProcessor<FunctionEvent> stepTwoBatchProcessor =  
15.         new BatchEventProcessor<FunctionEvent>(ringBuffer, stepTwoSequenceBarrier, stepTwoFunctionHandler);  
16.   
17.   
18.     private final SequenceBarrier stepThreeSequenceBarrier = ringBuffer.newBarrier(stepTwoBatchProcessor.getSequence());  
19.     private final FunctionEventHandler stepThreeFunctionHandler = new FunctionEventHandler(FunctionStep.THREE);  
20.     private final BatchEventProcessor<FunctionEvent> stepThreeBatchProcessor =  
21.         new BatchEventProcessor<FunctionEvent>(ringBuffer, stepThreeSequenceBarrier, stepThreeFunctionHandler);  
22.     {  
23.         ringBuffer.setGatingSequences(stepThreeBatchProcessor.getSequence());  
24.     }  

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1.   

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1.   

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1. <pre name="code" class="java">Disruptor  disruptor = new Disruptor<TestEvent>(TestEvent.EVENT_FACTORY, executor,  
2.                                              new SingleThreadedClaimStrategy(4),  
3.                                              new BlockingWaitStrategy());  
4. private final FunctionEventHandler stepOneFunctionHandler = new FunctionEventHandler(FunctionStep.ONE);  
5. EventHandlerGroup< TestEvent > group = disruptor. handleEventsWith(stepOneFunctionHandler);  
6.   
7. private final FunctionEventHandler stepTwoFunctionHandler = new FunctionEventHandler(FunctionStep.TWO);  
8.   
9. private final FunctionEventHandler stepThreeFunctionHandler = new FunctionEventHandler(FunctionStep.THREE);  
10. disruptor.handleEventsWith(stepOneFunctionHandler);  
11. disruptor.after(stepOneFunctionHandler).handleEventsWith(stepTwoFunctionHandler);  
12. disruptor.after(stepTwoFunctionHandler).handleEventsWith(stepThreeFunctionHandler);  
13.   
14. 或者  
15. Disruptor. handleEventsWith(stepOneFunctionHandler).then(stepTwoFunctionHandler).then(stepThreeFunctionHandler);  
16. disruptor.start();  
17. </pre><br>  
18. <br>  
19. <pre></pre>  
20. <p></p>  
21. <p>3.<strong>Multicast a series of messages to multiple EventProcessors</strong></p>  
22. <p><img src="http://hi.csdn.net/attachment/201203/8/0_1331177654ZLnL.gif" alt=""></p>  
23. <p>P1  - Publisher 1</p>  
24. <p align="left">RB  - RingBuffer</p>  
25. <p align="left">SB  -SequenceBarrier</p>  
26. <p align="left">EP1 - EventProcessor 1</p>  
27. <p align="left">EP2 - EventProcessor 2</p>  
28. <p>EP3 -EventProcessor 3</p>  
29. <p></p>  
30. <p></p>  
31. <pre name="code" class="java">private final RingBuffer<ValueEvent> ringBuffer =  
32.         new RingBuffer<ValueEvent>(ValueEvent.EVENT_FACTORY,  
33.                                    new SingleThreadedClaimStrategy(BUFFER_SIZE),  
34.                                    new YieldingWaitStrategy());  
35.   
36.     private final SequenceBarrier sequenceBarrier = ringBuffer.newBarrier();  
37.   
38.     private final ValueMutationEventHandler[] handlers = new ValueMutationEventHandler[NUM_EVENT_PROCESSORS];  
39.     {  
40.         handlers[0] = new ValueMutationEventHandler(Operation.ADDITION);  
41.         handlers[1] = new ValueMutationEventHandler(Operation.SUBTRACTION);  
42.         handlers[2] = new ValueMutationEventHandler(Operation.AND);  
43.     }  
44.   
45.     private final BatchEventProcessor[] batchEventProcessors = new BatchEventProcessor[NUM_EVENT_PROCESSORS];  
46.     {  
47.         batchEventProcessors[0] = new BatchEventProcessor<ValueEvent>(ringBuffer, sequenceBarrier, handlers[0]);  
48.         batchEventProcessors[1] = new BatchEventProcessor<ValueEvent>(ringBuffer, sequenceBarrier, handlers[1]);  
49.         batchEventProcessors[2] = new BatchEventProcessor<ValueEvent>(ringBuffer, sequenceBarrier, handlers[2]);  
50.   
51.         ringBuffer.setGatingSequences(batchEventProcessors[0].getSequence(),  
52.                                       batchEventProcessors[1].getSequence(),  
53.                                       batchEventProcessors[2].getSequence());  
54.     }<strong>  
55. </strong></pre><pre name="code" class="java">Disruptor  disruptor = new Disruptor<TestEvent>(TestEvent.EVENT_FACTORY, executor,  
56.                                              new SingleThreadedClaimStrategy(4),  
57.                                              new BlockingWaitStrategy());  
58. private final FunctionEventHandler stepOneFunctionHandler = new FunctionEventHandler(FunctionStep.ONE);  
59. EventHandlerGroup< TestEvent > group = disruptor. handleEventsWith(stepOneFunctionHandler);  
60.   
61. private final FunctionEventHandler stepTwoFunctionHandler = new FunctionEventHandler(FunctionStep.TWO);  
62.   
63. private final FunctionEventHandler stepThreeFunctionHandler = new FunctionEventHandler(FunctionStep.THREE);  
64.   
65. disruptor. handleEventsWith(stepOneFunctionHandler ,stepTwoFunctionHandler,stepThreeFunctionHandler);  
66. disruptor.start();  
67. </pre><br>  
68. 4.<strong>Replicate a message then fold back the results</strong>  
69. <p></p>  
70. <p><img src="http://hi.csdn.net/attachment/201203/8/0_1331177673MmKX.gif" alt=""><br>  
71. </p>  
72. <p> P1  - Publisher 1</p>  
73. <p style="font-weight:bold"></p>  
74. <p align="left"> RB  - RingBuffer</p>  
75. <p align="left"> SB1 - SequenceBarrier 1</p>  
76. <p align="left"> EP1 - EventProcessor 1</p>  
77. <p align="left"> EP2 - EventProcessor 2</p>  
78. <p align="left">SB2 - SequenceBarrier 2</p>  
79. <p>EP3 -EventProcessor 3</p>  
80. <pre name="code" class="java">private final RingBuffer<FizzBuzzEvent> ringBuffer =  
81.         new RingBuffer<FizzBuzzEvent>(FizzBuzzEvent.EVENT_FACTORY,  
82.                                       new SingleThreadedClaimStrategy(BUFFER_SIZE),  
83.                                       new YieldingWaitStrategy());  
84.   
85.     private final SequenceBarrier sequenceBarrier = ringBuffer.newBarrier();  
86.   
87.     private final FizzBuzzEventHandler fizzHandler = new FizzBuzzEventHandler(FizzBuzzStep.FIZZ);  
88.     private final BatchEventProcessor<FizzBuzzEvent> batchProcessorFizz =  
89.         new BatchEventProcessor<FizzBuzzEvent>(ringBuffer, sequenceBarrier, fizzHandler);  
90.   
91.     private final FizzBuzzEventHandler buzzHandler = new FizzBuzzEventHandler(FizzBuzzStep.BUZZ);  
92.     private final BatchEventProcessor<FizzBuzzEvent> batchProcessorBuzz =  
93.         new BatchEventProcessor<FizzBuzzEvent>(ringBuffer, sequenceBarrier, buzzHandler);  
94.   
95.     private final SequenceBarrier sequenceBarrierFizzBuzz =  
96.         ringBuffer.newBarrier(batchProcessorFizz.getSequence(), batchProcessorBuzz.getSequence());  
97.   
98.     private final FizzBuzzEventHandler fizzBuzzHandler = new FizzBuzzEventHandler(FizzBuzzStep.FIZZ_BUZZ);  
99.     private final BatchEventProcessor<FizzBuzzEvent> batchProcessorFizzBuzz =  
100.             new BatchEventProcessor<FizzBuzzEvent>(ringBuffer, sequenceBarrierFizzBuzz, fizzBuzzHandler);  
101.     {  
102.         ringBuffer.setGatingSequences(batchProcessorFizzBuzz.getSequence());  
103. }  
104. </pre><br>  
105. <pre name="code" class="java">Disruptor  disruptor = new Disruptor<TestEvent>(TestEvent.EVENT_FACTORY, executor,  
106.                                              new SingleThreadedClaimStrategy(4),  
107.                                              new BlockingWaitStrategy());  
108. private final FunctionEventHandler stepOneFunctionHandler = new FunctionEventHandler(FunctionStep.ONE);  
109. EventHandlerGroup< TestEvent > group = disruptor. handleEventsWith(stepOneFunctionHandler);  
110.   
111. private final FunctionEventHandler stepTwoFunctionHandler = new FunctionEventHandler(FunctionStep.TWO);  
112.   
113. private final FunctionEventHandler stepThreeFunctionHandler = new FunctionEventHandler(FunctionStep.THREE);  
114.   
115. disruptor. handleEventsWith(stepOneFunctionHandler ,stepTwoFunctionHandler);  
116. disruptor.after(stepOneFunctionHandler, stepTwoFunctionHandler).handleEventsWith(stepThreeFunctionHandler);  
117. disruptor.start();  
118. </pre><br>  
119. 5.<strong>Sequence a series of messages from multiple publishers</strong>  
120. <p></p>  
121. <p></p>  
122. <p style="font-weight:bold"><img src="http://hi.csdn.net/attachment/201203/8/0_13311776879is6.gif" alt=""><br>  
123. </p>  
124. <p style="font-weight:bold"> P1  - Publisher 1</p>  
125.  P2  - Publisher 2<br>  
126.  P3  - Publisher 3<br>  
127.  RB  - RingBuffer<br>  
128.  SB  - SequenceBarrier<br>  
129.  EP1 - EventProcessor 1<br>  
130. <pre name="code" class="java">private final RingBuffer<ValueEvent> ringBuffer =  
131.         new RingBuffer<ValueEvent>(ValueEvent.EVENT_FACTORY,  
132.                                    new MultiThreadedLowContentionClaimStrategy(BUFFER_SIZE),  
133.                                    new YieldingWaitStrategy());  
134.   
135.     private final SequenceBarrier sequenceBarrier = ringBuffer.newBarrier();  
136.     private final ValueAdditionEventHandler handler = new ValueAdditionEventHandler();  
137.     private final BatchEventProcessor<ValueEvent> batchEventProcessor = new BatchEventProcessor<ValueEvent>(ringBuffer, sequenceBarrier, handler);  
138.     private final ValuePublisher[] valuePublishers = new ValuePublisher[NUM_PUBLISHERS];  
139.     {  
140.         for (int i = 0; i < NUM_PUBLISHERS; i++)  
141.         {  
142.             valuePublishers[i] = new ValuePublisher(cyclicBarrier, ringBuffer, ITERATIONS / NUM_PUBLISHERS);  
143.         }  
144.   
145.         ringBuffer.setGatingSequences(batchEventProcessor.getSequence());  
146.     }</pre><br>  
147. <br>  
148. <p></p>  
149. <p><strong><br>  
150. </strong></p>  
151. <br>  
152. <pre></pre>  
153. <pre></pre>  
154. <pre></pre>  
155. <pre></pre>  
156. <pre></pre>  
157. <pre></pre>  
158. <pre></pre>  
159. <pre></pre>  
160. <pre></pre>