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86 lines
1.8 KiB
86 lines
1.8 KiB
# 事件驱动
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在jetlinks中大量使用到事件驱动,使用`事件总线(EventBus)`基于`topic`来进行数据传递.
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## Topic
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采用树结构来定义topic如:`/device/id/message/type` .
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topic支持路径通配符,如:`/device/**` 或者`/device/*/message/*`.
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::: tip
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通配符`**`表示匹配多层路径,`*`表示匹配单层路径. `不支持`前后匹配,如: `/device/id-*/message`.
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发布和订阅均支持通配符,发布时使用通配符时则进行广播.
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:::
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## 使用
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订阅消息:
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```java
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@Subscribe("/user/*/saved")
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public Mono<Void> handleDeviceMessage(UserEntity entity){
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return publishDeviecMessageToKafka(message);
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}
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```
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发布消息:
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```java
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@Autowired
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private EventBus eventBus;
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public Mono<Void> saveUser(UserEntity entity){
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return service.saveUser(entity)
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.then(eventBus.publish("/user/"+entity.getId()+"/saved",entity))
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.then();
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}
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```
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## topic列表
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### 设备消息
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[点击查看](../best-practices/start.md#设备消息对应事件总线topic)
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## 设备告警
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在配置了设备告警规则,设备发生告警时,会发送消息到消息总线.
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```js
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`/rule-engine/device/alarm/{productId}/{deviceId}/{ruleId}`
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{
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"productId":"",
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"alarmId":"",
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"alarmName":"",
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"deviceId":"",
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"deviceName":"",
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"...":"其他从规则中获取到到信息"
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}
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```
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## 系统日志
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topic格式: `/logging/system/{logger名称,.替换为/}/{level}`.
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```js
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`/logging/system/org/jetlinks/pro/TestService/{level}`
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{
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"name":"org.jetlinks.pro.TestService", //logger名称
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"threadName":"线程名称",
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"level":"日志级别",
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"className":"产生日志的类名",
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"methodName":"产生日志的方法名",
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"lineNumber"：32,//行号
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"message":"日志内容",
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"exceptionStack":"异常栈信息",
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"createTime":"日志时间",
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"context":{} //上下文信息
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}
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``` |