问题描述
我想汇总3个主题，但仅针对汇总策略的PoC，我尝试汇总2个主题。
因此，我已经配置了以下骆驼路线：
@Override
public void configure() throws Exception {
CamelContext contexto = new DefaultCamelContext();
try{
onException(sqlException.class,Exception.class)
.handled(true)
.maximumRedeliveries(1)
.process(new CustomExceptionProcess());
errorHandler(deadLetterChannel("file:data/error") // There is no file created
.maximumRedeliveries(3)
.redeliveryDelay(5000));
from("kafka:topic1")
.process(new Processtopic1()) // inside this process
.to("direct:agregador");
from("kafka:topic2")
.process(new Processtopic2())
.to("direct:agregador");
from("direct:agregador")
.aggregate(header("idAgregador"),new EstrategiaAgregador()) // implements AggregationStrategy
.completionPredicate(predicadoTamanhoMinimo()) // This just to check if is there at least 2 objects before realease the aggregation.
.eagerCheckCompletion()
.to("direct:insereBanco")
;
from("direct:insereBanco")
.process(new ProcessoInsere());
}catch (Exception e){
LOG.error("Error in the route: ",e);
}
topic1和topic2的过程就是这样：
// It's the same process for Processtopic1 and Processtopic2
@Override
public void process(Exchange exchange) throws Exception {
if(!(exchange.getIn().getBody() instanceof Object1)){
String someData = (String) exchange.getIn().getBody();
JSONParser parser = new JSONParser();
Object objeto = parser.parse(someData);
JSONObject json = (JSONObject) objeto;
ObjectMapper mapeadorObj = new ObjectMapper();
Object1 someEntity = mapeadorObj.readValue(json.toString(),Object1.class);
ProducerTemplate producerTemplate = exchange.getContext().createProducerTemplate();
producerTemplate.sendBodyAndHeader("direct:agregador",someEntity,"idAgregador",someEntity.getId());
}
}
但是，当我收到第一条消息进行汇总时，消息离开（因为必须等待第二条消息），但是很快此消息退出，我遇到了以下异常：
org.apache.camel.CamelExchangeException: Invalid correlation key. Exchange[ID-XXXX-1597437627634-0-1]
at org.apache.camel.processor.aggregate.AggregateProcessor.doProcess(AggregateProcessor.java:302)
at org.apache.camel.processor.aggregate.AggregateProcessor.process(AggregateProcessor.java:271)
at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:76)
at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:548)
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:201)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:138)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:101)
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:201)
at org.apache.camel.component.direct.DirectProducer.process(DirectProducer.java:76)
>> at org.apache.camel.processor.SendProcessor.process(SendProcessor.java:148)
at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:76)
at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:548)
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:201)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:138)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:101)
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:201)
at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:97)
>> at org.apache.camel.component.kafka.KafkaConsumer$KafkaFetchRecords.doRun(KafkaConsumer.java:326)
at org.apache.camel.component.kafka.KafkaConsumer$KafkaFetchRecords.run(KafkaConsumer.java:215)
一件事是我也在使用Kafka主题发送消息，并且由于它出现在堆栈跟踪中，因此我不确定是否也需要为Kafka设置一些东西。
解决方法
在您的路线中，您已经在执行.to("direct:agregador")。为什么要使用生产者模板将其发送到处理器中？
似乎正在发生的事情是，处理器正在交换中成功向聚合器发送someEntity，但是当控制权返回到路由时，因为您尚未将交换主体设置为{{1 }}，交换仍然保留没有someEntity头的原始消息。
您可以在处理器中执行的操作是删除生产者模板代码并添加：
idAgregador