[英]How to process message just before it send to DLQ
我正在使用以下服務器端重新傳送配置
<plugins>
<redeliveryPlugin fallbackToDeadLetter="true" sendToDlqIfMaxRetriesExceeded="true">
<redeliveryPolicyMap>
<redeliveryPolicyMap>
<redeliveryPolicyEntries>
<redeliveryPolicy
queue = "com.api.RequestQueue.v1"
maximumRedeliveries="20"
initialRedeliveryDelay="60000"
redeliveryDelay="60000" />
<redeliveryPolicy
queue = "com.api.RequestQueue.v2"
maximumRedeliveries="10"
initialRedeliveryDelay="30000"
redeliveryDelay="30000" />
<redeliveryPolicy
queue = "com.api.ResponseQueue.v1"
maximumRedeliveries="3"
initialRedeliveryDelay="34000"
redeliveryDelay="34000" />
</redeliveryPolicyEntries>
</redeliveryPolicyMap>
</redeliveryPolicyMap>
</redeliveryPlugin>
</plugins>
如何設置自定義的端點,以在重試之后和發送至DLQ之前處理失敗的消息? 我確實引用了以下鏈接,但找不到任何有關服務器端或redeliveryPlugin配置的內容
1. 死信通道
如果您使用的是藍圖或彈簧,則可以很容易地做到這一點:
<!-- Redelivery Policy -->
<bean class="org.apache.camel.processor.RedeliveryPolicy" id="redeliveryPolicyConfig">
<property name="5" />
<property name="redeliveryDelay" value="5000" />
<property name="logRetryAttempted" value="true" />
</bean>
<!-- Error Handler -->
<bean class="org.apache.camel.builder.DeadLetterChannelBuilder" id="errorHandler">
<property name="deadLetterUri" value="direct:error" />
<property name="useOriginalMessage" value="true" />
<property name="redeliveryPolicy" ref="redeliveryPolicyConfig" />
</bean>
然后,將錯誤處理程序指向的路由添加到“ deadLetterUri”屬性中,如下所示:
<!-- Perform custom logic and send to DLQ -->
<route id="myDLQ-route">
<from uri="direct:error" />
<!-- Maybe some logic here, logging perhaps? -->
<to uri="activemq:queue:myDLQ" />
</route>
我正在使用spring,但是重新交付配置位於單獨的代理容器中,目前無法更改。
但是以下配置有效。
路線:
public class MyMessageRoute extends RouteBuilder {
public void configure() throws Exception {
onException(Exception.class)
.handled(true)
.bean(PreDLQLogWriter.class) ;
from(fromQueueName).id("RouteId")
.transacted()
//process message
;
}}
public class PreDLQLogWriter {
private static final org.slf4j.Logger LOG =
org.slf4j.LoggerFactory.getLogger( PreDLQLogWriter.class );
int configuredDeliveryCount = maximumRedeliveries+1;
public void logMessageDetails(Exchange exchange) throws Exception {
int actualDeliveryCount = exchange.getIn().getHeader("JMSXDeliveryCount")
!= null ? exchange.getIn().getHeader("JMSXDeliveryCount",
Integer.class) : 0 ;
if(actualDeliveryCount = configuredDeliveryCount) {
LOG.info(" Pre-DLQ Log: Log the message with message id ");
}}
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