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Updated DevGuide (markdown)

Jack
2018-10-12 12:12:12 +08:00
parent dbb6c6d418
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DevGuide.md

@@ -124,6 +124,24 @@
<p> </p>
<p>instance.xml要满足一个基本元素：</p>
<p>1. 一份instance.xml中有一份或者多份instance定义，优先以destination名字查找对应的instance bean定义，如果没有，则按默认的名字“instance”查找instance对象</p>
例如 `xxxx-instance.xml`中定义 id 分别为 `instance-1`, `instance-2` 的两个bean.
```xml
<bean id="instance-1" class="com.alibaba.otter.canal.instance.spring.CanalInstanceWithSpring">
<property name="destination" value="${canal.instance.destination}" />
<property name="eventParser">
<ref local="eventParser" />
</property>
......
</bean>
<bean id="instance-2" class="com.alibaba.otter.canal.instance.spring.CanalInstanceWithSpring">
<property name="destination" value="${canal.instance.destination}" />
.......
</bean>
```
这两个bean将为同名的instance 提供自定义的`eventParser , evnetSink , evnetStore , metaManager，alarmHandler`.
如果没有自定义这些bean, 就使用 id="instance" 的bean来配置canal instance.
<p>2. 一份instance bean定义，需要包含eventParser , evnetSink , evnetStore , metaManager，alarmHandler的5个模块定义，(alarmHandler主要是一些报警机制处理，因为简单没展开，可扩展)</p>
<p> </p>
<p>完成custom-instance.xml定义后，可通过canal.properties配置中进行引入：</p>