Spring集成：聚合器不会将拆分的消息聚合到一个消息中

时间：2014-07-08 09:57:30

标签： spring-integration

如何在现有Spring Integration流程的中间添加以下流程：

来自emp表的查询。它返回例如3排。将这3行插入dept表，然后继续之前运行的流程。

Splitter是手动配置来实现它的。但是，<int:aggregator />之后流量不会继续。

EMP-context.xml中

...

<int:splitter apply-sequence="false" /> <!-- parent splitter -->

...

<jdbc:outbound-gateway
    query="SELECT * FROM emp"
    row-mapper="empMapper" data-source="myDataSource"
    max-rows-per-poll="100000" />

<int:service-activator ref="myService" method="process" />

<!--     <int:splitter /> child splitter commented out -->

<jdbc:outbound-gateway
    update="INSERT INTO dept (name, dept)
        VALUES(:headers[name], :headers[dept])"
    data-source="myDataSource" />

<int:aggregator />

<!-- flow is not executed after aggregator -->

<jdbc:outbound-gateway
    update="INSERT INTO other_table (mycol)
        VALUES(:headers[mycol])"
    data-source="myDataSource" />

...

MyService.java 

public List<Message<String>> process(List<EmpRecord> records, @Headers MessageHeaders headers) {

    List<Message<String>> result = new ArrayList<Message<String>>();

    UUID correlationId = UUID.randomUUID();
    int sequenceNumber = 0;
    int sequenceSize = records.size();

    for (EmpRecord record : records) {

        msg = MessageBuilder
            .withPayload("null")
            .copyHeaders(headers) // headers contains mycol key that I want to preserve to use after aggregator.
            .setHeader("name", record.getName())
            .setHeader("dept", record.getDept())
            .pushSequenceDetails(correlationId, ++sequenceNumber, sequenceSize)
            .build();

        result.add(msg);
    }

    return result;
}

编辑：添加了堆栈跟踪。

请注意，上述代码中提到的标题，类和表名称与实际实现不同。所以，我已根据上面的代码修改了堆栈跟踪。

06:43:35.171 DEBUG [main][org.springframework.jdbc.core.JdbcTemplate] Executing prepared SQL query
06:43:35.171 DEBUG [main][org.springframework.jdbc.core.JdbcTemplate] Executing prepared SQL statement [SELECT * FROM emp]
06:43:35.171 DEBUG [main][org.springframework.integration.jdbc.JdbcOutboundGateway] handler 'org.springframework.integration.handler.MessageHandlerChain#2$child#0.handler' sending reply Message: [Payload=[com.model.EmpRecord@9a18a0, com.model.EmpRecord@c6e1ec, com.model.EmpRecord@11a5fd0, com.model.EmpRecord@8890da]][Headers={mycol=c1}]
06:43:35.171 DEBUG [main][org.springframework.integration.handler.ServiceActivatingHandler] ServiceActivator for [org.springframework.integration.handler.MethodInvokingMessageProcessor@1de007d] received message: [Payload=[com.model.EmpRecord@9a18a0, com.model.EmpRecord@c6e1ec, com.model.EmpRecord@11a5fd0, com.model.EmpRecord@8890da]][Headers={mycol=c1}]
06:43:35.171 INFO  [main][com.service.MyServiceActivator] START :: process
06:43:35.171 INFO  [main][com.service.MyServiceActivator] END :: process
06:43:35.171 DEBUG [main][org.springframework.integration.handler.ServiceActivatingHandler] handler 'ServiceActivator for [org.springframework.integration.handler.MethodInvokingMessageProcessor@1de007d]' sending reply Message: [Payload=null][Headers={name=john, dept=BE, mycol=c1}]
06:43:35.171 DEBUG [main][org.springframework.integration.jdbc.JdbcOutboundGateway] org.springframework.integration.handler.MessageHandlerChain#2$child#3.handler received message: [Payload=null][Headers={name=john, dept=BE, mycol=c1}]
06:43:35.187 DEBUG [main][org.springframework.jdbc.core.JdbcTemplate] Executing prepared SQL update
06:43:35.187 DEBUG [main][org.springframework.jdbc.core.JdbcTemplate] Executing prepared SQL statement [INSERT INTO dept (name, dept) VALUES(?, ?)]
06:43:35.187 DEBUG [main][org.springframework.jdbc.core.JdbcTemplate] SQL update affected 1 rows
06:43:35.187 DEBUG [main][org.springframework.integration.jdbc.JdbcOutboundGateway] handler 'org.springframework.integration.handler.MessageHandlerChain#2$child#3.handler' sending reply Message: [Payload={UPDATED=1}][Headers={name=john, dept=BE, mycol=c1}]
06:43:35.187 DEBUG [main][org.springframework.integration.aggregator.AggregatingMessageHandler] org.springframework.integration.handler.MessageHandlerChain#2$child#4.handler received message: [Payload={UPDATED=1}][Headers={name=john, dept=BE, mycol=c1}]
06:43:35.187 DEBUG [main][org.springframework.integration.aggregator.AbstractCorrelatingMessageHandler] Handling message with correlationKey [cc7b7fc3-8d7e-bf15-240f-9e893ab7f5cc]: [Payload={UPDATED=1}][Headers={name=john, dept=BE, mycol=c1}]
06:43:35.171 DEBUG [main][org.springframework.integration.handler.ServiceActivatingHandler] handler 'ServiceActivator for [org.springframework.integration.handler.MethodInvokingMessageProcessor@1de007d]' sending reply Message: [Payload=null][Headers={name=john, dept=BE, mycol=c1}]
06:43:35.171 DEBUG [main][org.springframework.integration.jdbc.JdbcOutboundGateway] org.springframework.integration.handler.MessageHandlerChain#2$child#3.handler received message: [Payload=null][Headers={name=john, dept=BE, mycol=c1}]
06:43:35.218 DEBUG [main][org.springframework.jdbc.core.JdbcTemplate] Executing prepared SQL update
06:43:35.218 DEBUG [main][org.springframework.jdbc.core.JdbcTemplate] Executing prepared SQL statement INSERT INTO dept (name, dept) VALUES(?, ?))]
06:43:35.218 DEBUG [main][org.springframework.jdbc.core.JdbcTemplate] SQL update affected 1 rows
06:43:35.218 DEBUG [main][org.springframework.integration.jdbc.JdbcOutboundGateway] handler 'org.springframework.integration.handler.MessageHandlerChain#2$child#3.handler' sending reply Message: [Payload={UPDATED=1}][Headers={name=ravi, dept=SE, mycol=c1}]
06:43:35.218 DEBUG [main][org.springframework.integration.aggregator.AggregatingMessageHandler] org.springframework.integration.handler.MessageHandlerChain#2$child#4.handler received message: [Payload={UPDATED=1}][Headers={name=ravi, dept=SE, mycol=c1}]
06:43:35.218 DEBUG [main][org.springframework.integration.aggregator.AbstractCorrelatingMessageHandler] Handling message with correlationKey [fc91e0bc-87a3-251f-87fd-fc3901285cde]: [Payload={UPDATED=1}][Headers={name=ravi, dept=SE, mycol=c1}]

1 个答案:

答案 0 :(得分：1)

我看到了原因的根源！

由于您从MyServiceActivator返回List<Message<String>>，AbstractReplyProducingMessageHandler将其确定为Iterable<Message<?>>并将其逐个发送到output-channel。所以<splitter>没有看到任何要拆分的东西，并按原样发送它们 - 一条输入消息，一条输出消息。从<aggregator> collect groups看不到<splitter>。这就是为什么它为每个输入生成几条消息 - 只是因为它们位于不同的sequenceDetails。

要解决您的问题，您应该摆脱public List<Message<String>> process(List<EmpRecord> records, @Headers MessageHeaders headers) { List<Message<String>> result = new ArrayList<Message<String>>(); UUID correlationId = UUID.randomUUID(); int sequenceNumber = 0; int sequenceSize = records.size(); for (EmpRecord record : records) { msg = MessageBuilder .withPayload("null") .copyHeaders(headers) // headers contains mycol key that I want to preserve to use after aggregator. .setHeader("name", record.getName()) .setHeader("dept", record.getDept()) .setHeader("correlationId", correlationId) .setHeader("sequenceNumber", ++sequenceNumber) .setHeader("sequenceSize", sequenceSize) .build(); result.add(msg); } return result; } 并手动填充{{1}}：

{{1}}
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