Camel Splitter分配器以及Aggregate聚合器使用实例

来源：互联网发布：windows 98系统下载编辑：程序博客网时间：2024/05/20 12:23

作用：splite分批 aggregate聚合单线程处理通过splite变成多线程并行处理。

使用场景：一个消息如果它包含多个元素，其中每一个元素可能要以不同的方式去处理，那么我们该如何处理？

分析：需要将不同类型的消息发给别的bundle去做处理，可以根据类型进行分类，然后根据不同类型聚合起来，最后再根据聚合后的对应类型去到不同的bundle做处理。

<dependency><groupId>org.apache.camel</groupId><artifactId>camel-core</artifactId><version>2.15.2</version></dependency><dependency><groupId>org.osgi</groupId><artifactId>org.osgi</artifactId><version>3.0.0</version></dependency>

1.在blueprint中配置

<bean id="TaskAggregator" class="com.jmust.lklk.TaskAggregator"></bean><bean id="ResponseAggregator" class="com.jmust.lklk.ResponseAggregator"></bean>

<camelContext id="SpliteCamelContext" xmlns="http://camel.apache.org/schema/blueprint" xsi:schemaLocation="http://camel.apache.org/schema/blueprint http://camel.apache.org/schema/blueprint/camel-blueprint.xsd">        <route>            <from uri="direct-vm:_PayTaskSplit"/><!--跨bundle之间调用 -->            <split strategyRef="ResponseAggregate"> <!--返回结果  把Exchange进行聚合-->                <simple>${body}</simple>                <to uri="bean:BatchSplitProcessorBean"/>                <to uri="log:xxxxxxxxxxy"/>                <choice>                    <when>                        <simple>${header.CamelSplitComplete}</simple>                        <setHeader headerName="CamelAggregationCompleteAllGroupsInclusive" >                        <constant>true</constant>                        </setHeader>                    </when>                </choice>                <aggregate strategyRef="TaskAggregator" completionSize="3" completionFromBatchConsumer="true"> <!-- 把分拆后的结果按照类型聚合 ，如果是List对象，那么会自动将里面的小对象拆分-->                    <correlationExpression>                        <simple>${in.header.group}</simple><!-- 按照规则聚合，比如 in.header.group == 100 ，那么就按照100进行聚合-->                    </correlationExpression>                    <completionPredicate>                        <simple>${in.header.CamelSplitComplete} == true </simple>                    </completionPredicate> <!-- 分拆结束标识-->                    <to uri="log:yyyyyyyyyyx"/>                    <to uri="log:ddddd?showAll=true" />                    <choice>                        <when>                            <simple>${in.header.group} != '01' and ${in.header.group} != '04'</simple>                            <!--<wireTap uri="vm:_choosePayPolicy" />-->                            <wireTap uri="log:_choosePayPolicy" />                        </when>                    </choice>                </aggregate>            </split>            <wireTap uri="vm:_UpdateRecordProcessor"/><!-- 将此放在外面才能拿全部的内容，否则拿到按类型聚合后的结果，需要具体业务具体操作-->            <to uri="direct-vm:_ValidateRecodProcessor"/>        </route>    </camelContext>

2.创建TaskAggregate聚合类以及ResponseAggregate聚合类

public class TaskAggregate implements AggregationStrategy {     private static final Logger log = LoggerFactory.getLogger(TaskAggregate.class);    @Override    public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {        List<PaymentRequest> responseList = new ArrayList<>();        PaymentRequest paymentRequest = newExchange.getIn().getBody(PaymentRequest.class);        if (null == oldExchange) {            responseList.add(paymentRequest);            newExchange.getIn().setBody(responseList);            return newExchange;        } else {            responseList = oldExchange.getIn().getBody(ArrayList.class);            responseList.add(paymentRequest);            oldExchange.getIn().setBody(responseList);            return oldExchange;        }    }}

public class ResponseAggregate implements AggregationStrategy {     private static final Logger log = LoggerFactory.getLogger(ResponseAggregate.class);    @Override    public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {        List<PaymentRequest> responseList = new ArrayList<>();        PaymentRequest paymentRequest = newExchange.getIn().getBody(PaymentRequest.class);        if (null == oldExchange) {            responseList.add(paymentRequest);            newExchange.getIn().setBody(responseList);            return newExchange;        } else {            responseList = oldExchange.getIn().getBody(ArrayList.class);            responseList.add(paymentRequest);            oldExchange.getIn().setBody(responseList);            return oldExchange;        }    }}

0 0