Question

我正在使用jdbc支持的 camel：aggregate ，似乎它不会保存Exchange属性。例如，如果我配置了以下路由并且一旦聚合完成并且在执行camel之前停止执行：to（log）强制聚合在重新启动时从数据库检索数据，那么camel：to（log）将不会打印属性 myProperty

<camel:route id="myRoute">
    <camel:from uri="direct:in"/>

    <camel:setProperty propertyName="myProperty">
        <camel:constant>myPropertyValue</camel:constant>
    </camel:setProperty>

    <camel:aggregate strategyRef="myStrategy" aggregationRepositoryRef="myAggregationRepo" discardOnCompletionTimeout="true" completionTimeout="86400000" >
        <camel:correlationExpression>
            <camel:simple>${property.partlastcorrelationkey}</camel:simple>
        </camel:correlationExpression>
        <camel:completionPredicate>
            <camel:simple>${property.partlastcorrelationwaitmore} == false</camel:simple>
        </camel:completionPredicate>

        <camel:to uri="log:com.test?showAll=true"/>

    </camel:aggregate>
</camel:route>

我的聚合存储库以这种方式配置：

<bean id="myAggregationRepo" class="org.apache.camel.processor.aggregate.jdbc.JdbcAggregationRepository" init-method="start" destroy-method="stop">
    <property name="transactionManager" ref="transactionManager"/>
    <property name="repositoryName" value="PROC_AGG"/>
    <property name="dataSource" ref="oracle-ds"/>
    <property name="lobHandler">
        <bean class="org.springframework.jdbc.support.lob.OracleLobHandler">
            <property name="nativeJdbcExtractor">
                <bean class="org.springframework.jdbc.support.nativejdbc.CommonsDbcpNativeJdbcExtractor"/>
            </property>
        </bean>
    </property>
</bean>

如何在使用聚合器时保存属性？

Answer 1

我会回复自己。如代码所示，在使用数据库备份聚合器时，JdbcCamelCodec不允许保存属性：

public final class JdbcCamelCodec {
    public byte[] marshallExchange(CamelContext camelContext, Exchange exchange) throws IOException {
        // use DefaultExchangeHolder to marshal to a serialized object
        DefaultExchangeHolder pe = DefaultExchangeHolder.marshal(exchange, false);
        // add the aggregated size property as the only property we want to retain
        DefaultExchangeHolder.addProperty(pe, Exchange.AGGREGATED_SIZE, exchange.getProperty(Exchange.AGGREGATED_SIZE, Integer.class));
        // add the aggregated completed by property to retain
        DefaultExchangeHolder.addProperty(pe, Exchange.AGGREGATED_COMPLETED_BY, exchange.getProperty(Exchange.AGGREGATED_COMPLETED_BY, String.class));
        // add the aggregated correlation key property to retain
        DefaultExchangeHolder.addProperty(pe, Exchange.AGGREGATED_CORRELATION_KEY, exchange.getProperty(Exchange.AGGREGATED_CORRELATION_KEY, String.class));
        // persist the from endpoint as well
        if (exchange.getFromEndpoint() != null) {
            DefaultExchangeHolder.addProperty(pe, "CamelAggregatedFromEndpoint", exchange.getFromEndpoint().getEndpointUri());
        }
    return encode(pe);
}

基本上，问题出在这一行， false 表示：不保存属性。

DefaultExchangeHolder pe = DefaultExchangeHolder.marshal(exchange, false);

标题和正文是存储在数据库中的唯一标题。

Camel：Aggregator不会保留Exchange属性

1 个答案: