如何将多个消息聚合到一个消息中并在Mule中打印

Question

您好我正在使用Any Point Studio，我有一个场景，其中Mule正在从路径中读取，假设它正在从某个路径读取2个文件，并且它将这些文件视为2个单独的消息，我想将两者合并为一个

我也想知道使用MULE_CORRELATION_GROUP_SIZE为什么我们需要在聚合器组件之前定义它？

请使用Custom Aggregator共享代码以实现此目的，或者是更好的方法。

<?xml version="1.0" encoding="UTF-8"?>

<mule xmlns:tracking="http://www.mulesoft.org/schema/mule/ee/tracking" xmlns:file="http://www.mulesoft.org/schema/mule/file" xmlns:json="http://www.mulesoft.org/schema/mule/json" xmlns:mulexml="http://www.mulesoft.org/schema/mule/xml" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
	xmlns:spring="http://www.springframework.org/schema/beans" version="EE-3.5.0"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/file http://www.mulesoft.org/schema/mule/file/current/mule-file.xsd
http://www.mulesoft.org/schema/mule/xml http://www.mulesoft.org/schema/mule/xml/current/mule-xml.xsd
http://www.mulesoft.org/schema/mule/json http://www.mulesoft.org/schema/mule/json/current/mule-json.xsd
http://www.mulesoft.org/schema/mule/ee/tracking http://www.mulesoft.org/schema/mule/ee/tracking/current/mule-tracking-ee.xsd">
    <file:connector name="File" streaming="true" autoDelete="false" validateConnections="true" doc:name="File"/>
    <flow name="mule-file-aggregatorFlow1"  doc:name="mule-file-aggregatorFlow1">
        <file:inbound-endpoint path="\\mulespace\foldername" responseTimeout="10000" doc:name="File" connector-ref="File">
        </file:inbound-endpoint>
        <file:file-to-string-transformer doc:name="File to String"/>
        <message-properties-transformer doc:name="Message Properties">
        <add-message-property key="MULE_CORRELATION_GROUP_SIZE" value="2" />
        </message-properties-transformer>
        <custom-aggregator failOnTimeout="true" class="com.mine.custom.CustomAggregator" doc:name="Custom Aggregator"/>
        <json:object-to-json-transformer doc:name="Object to JSON"/>
        <logger message="#[message.payload]" level="INFO" doc:name="Logger"/>
    </flow>
</mule>

Answer 1

在文件后使用：inbound-endpoint：

<scripting:component doc:name="Groovy">
            <scripting:script engine="Groovy"><![CDATA[long now = new java.util.Date().getTime(); 
                long mod = now % 2000; 
                message.setCorrelationId(String.valueOf(now - mod));
                message.setCorrelationGroupSize(100);
                return message;
            ]]></scripting:script>
        </scripting:component>
        <collection-aggregator timeout="3000" failOnTimeout="false" doc:name="Collection Aggregator"/>
        <combine-collections-transformer doc:name="Combine Collections"/>