46. 追踪 Bus Events

可以通过设置spring.cloud.bus.trace.enabled=true来跟踪 Bus events(RemoteApplicationEvent的子类)。如果这样做,Spring Boot TraceRepository(如果存在)显示发送的每个 event 和来自每个服务实例的所有 ack。以下 example 来自/trace端点:

{
  "timestamp": "2015-11-26T10:24:44.411+0000",
  "info": {
    "signal": "spring.cloud.bus.ack",
    "type": "RefreshRemoteApplicationEvent",
    "id": "c4d374b7-58ea-4928-a312-31984def293b",
    "origin": "stores:8081",
    "destination": "*:**"
  }
  },
  {
  "timestamp": "2015-11-26T10:24:41.864+0000",
  "info": {
    "signal": "spring.cloud.bus.sent",
    "type": "RefreshRemoteApplicationEvent",
    "id": "c4d374b7-58ea-4928-a312-31984def293b",
    "origin": "customers:9000",
    "destination": "*:**"
  }
  },
  {
  "timestamp": "2015-11-26T10:24:41.862+0000",
  "info": {
    "signal": "spring.cloud.bus.ack",
    "type": "RefreshRemoteApplicationEvent",
    "id": "c4d374b7-58ea-4928-a312-31984def293b",
    "origin": "customers:9000",
    "destination": "*:**"
  }
}

前面的跟踪显示RefreshRemoteApplicationEventcustomers:9000,broadcast 发送到所有服务,并由customers:9000stores:8081接收(确认)。

要自己处理 ack 信号,可以为应用程序添加@EventListener AckRemoteApplicationEventSentApplicationEvent类型(并启用跟踪)。或者,您可以点击TraceRepository并从那里挖掘数据。

任何 Bus application 都可以追踪 ack。但是,有时,在中央服务中执行此操作非常有用,该服务可以对数据执行更复杂的查询或将其转发到专门的跟踪服务。