30 lines
765 B
Markdown
30 lines
765 B
Markdown
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# 简介
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Yarn状态机的基础部分参见：[Yarn 状态机以及事件机制](./yarn_event.md)
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本章主要将Yarn当中详细的事件以及处理过程。
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AsyncDispatcher是中央处理器的核心线程。通过使用AsyncDispatcher的对象可以分析Yarn里面有多少个中央处理器，每个处理器都由什么用途。
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## Component dispatcher
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当前的处理器注册了下面几个事件：
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- ServiceEventHandler:
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- ComponentEventHandler:
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- ComponentInstanceEventHandler:
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```java
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dispatcher.register(ServiceEventType.class, new ServiceEventHandler());
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dispatcher.register(ComponentEventType.class, new ComponentEventHandler());
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dispatcher.register(ComponentInstanceEventType.class,
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new ComponentInstanceEventHandler());
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```
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