Question

我需要从/ files目录下的文件中读取，然后在websocket客户端上显示该文件的内容。这就是我在MyRouteBuilder.scala中所做的事情：

import org.apache.camel.component.websocket.WebsocketComponent
import org.apache.camel.{LoggingLevel, CamelContext, Exchange}
import org.apache.camel.scala.dsl.builder.ScalaRouteBuilder

/**
 * A Camel Router using the Scala DSL
 */
class MyRouteBuilder(override val context : CamelContext) extends ScalaRouteBuilder(context) {

  // an example of a Processor method
  val myProcessorMethod = (exchange: Exchange) => {
    exchange.getIn.setBody("block test")
  }

  val ws = context.getComponent("websocket", classOf[WebsocketComponent]);
  ws.setPort(8444);
  ws.setHost("127.0.0.1")
  // we can serve static resources from the classpath: or file: system
  ws.setStaticResources("classpath:.");

  "file://files?noop=true" ==> {
    setBody(convertBodyTo(classOf[String]))
    to("websocket://127.0.0.1:8444/")
  }
}

但是，当我运行它时会给出以下stacktrace：

堆栈跟踪

java.lang.IllegalArgumentException：无法向单个连接发送消息;连接键未设置。 at org.apache.camel.component.websocket.WebsocketProducer.process（WebsocketProducer.java:57） at org.apache.camel.util.AsyncProcessorConverterHelper $ ProcessorToAsyncProcessorBridge.process（AsyncProcessorConverterHelper.java:61）在org.apache.camel.processor.SendProcessor.process（SendProcessor.java:141）在org.apache.camel.management.InstrumentationProcessor.process（InstrumentationProcessor.java:77） at org.apache.camel.processor.RedeliveryErrorHandler.process（RedeliveryErrorHandler.java:460）在org.apache.camel.processor.CamelInternalProcessor.process（CamelInternalProcessor.java:190）在org.apache.camel.processor.Pipeline.process（Pipeline.java:121）在org.apache.camel.processor.Pipeline.process（Pipeline.java:83）在org.apache.camel.processor.CamelInternalProcessor.process（CamelInternalProcessor.java:190） at org.apache.camel.component.file.GenericFileConsumer.processExchange（GenericFileConsumer.java:442） at org.apache.camel.component.file.GenericFileConsumer.processBatch（GenericFileConsumer.java:214）在org.apache.camel.component.file.GenericFileConsumer.poll（GenericFileConsumer.java:178）在org.apache.camel.impl.ScheduledPollConsumer.doRun（ScheduledPollConsumer.java:174）在org.apache.camel.impl.ScheduledPollConsumer.run（ScheduledPollConsumer.java:101） at java.util.concurrent.Executors $ RunnableAdapter.call（Executors.java:511） at java.util.concurrent.FutureTask.runAndReset（FutureTask.java:308） at java.util.concurrent.ScheduledThreadPoolExecutor $ ScheduledFutureTask.access $ 301（ScheduledThreadPoolExecutor.java:180） at java.util.concurrent.ScheduledThreadPoolExecutor $ ScheduledFutureTask.run（ScheduledThreadPoolExecutor.java:294）在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1142） at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:617）在java.lang.Thread.run（Thread.java:745） [el-2] thread＃0 - file：// files] GenericFileOnCompletion WARN回滚文件策略：org.apache.camel.component.file.strategy.GenericFileRenameProcessStrategy@72611f35 for file：GenericFile [audience.json] [el-2] thread＃0 - file：// files] DefaultErrorHandler ERROR在ExchangeId上传递失败（MessageId：ID-vaisakh-ubuntu-45785-1455531433908-1-11：ID-vaisakh-ubuntu-45785-1455531433908-1 -12）。交付尝试后用尽：1捕获：java.lang.IllegalArgumentException：无法向单个连接发送消息;连接键未设置。

消息历史记录

RouteId ProcessorId处理器已用完（ms） [route1] [route1] [file：// files？noop = true] [2] [route1] [convertBodyTo1] [convertBodyTo [java.lang.String]] [1] [route1] [setBody1] [setBody [{org.apache.camel.scala.ScalaExpression@f736069}]] [0] [route1] [to1] [websocket：//127.0.0.1：8444 /] [1]

交换

交换[ Id ID-vaisakh-ubuntu-45785-1455531433908-1-12 ExchangePattern InOnly 标题{breadcrumbId = ID-vaisakh-ubuntu-45785-1455531433908-1-11，CamelFileAbsolute = false，CamelFileAbsolutePath = / home / sagar / IdeaProjects / SampleIntegrationService / files / audience.json，CamelFileContentType = text / plain，CamelFileLastModified = 1455526488000，CamelFileLength = 150，CamelFileName = audience.json，CamelFileNameConsumed = audience.json，CamelFileNameOnly = audience.json，CamelFileParent = files，CamelFilePath = files / audience.json，CamelFileRelativePath = audience.json，CamelRedelivered = false，CamelRedeliveryCounter = 0} BodyType org.apache.camel.scala.dsl.SRouteDefinition Body SRouteDefinition（Route（route1）[[From [file：// files？noop = true]] - ＆gt; [ConvertBodyTo [java.lang.String]，SetBody [{org.apache.camel.scala.ScalaExpression@f736069} ]，[[websocket：//127.0.0.1：8444 /]]]，com.mediaiqdigital.sampleIntegrationService.MyRouteBuilder @ 67a27caa） ]

Answer 1

通过从标头设置连接密钥属性解决了该问题。

 from(websocketUrl) ==> {

     setProperty("wsConnKey", header("websocket.connectionkey"))
     to("file://files?noop=true")
 }

 "file://files?noop=true" ==> {

     setBody(convertBodyTo(classOf[String]))
     to(WEBSOCKET_RESPONSE_ENDPOINT)
 }

 from(WEBSOCKET_REPONSE_ENDPOINT) ==> {

     process(new Processor() {
         void process(Exchange exchange) {
             Object connectionKey = exchange.getproperty("wsConnKey");
             Object exchangeBody = exchange.getIn().getBody();
             exchange.getOut().setHeader("wsConnKey", connectionKey);
             exchange.getOut().setBody(exchangeBody);
         }
     })
    to(websocketUrl)
 }

如何在camel-scala中构建从文件到websocket客户端的路由？

堆栈跟踪

消息历史记录

交换

1 个答案: