java - Camel 交换 split 期间丢失的属性(property)

Question

我有以下 Camel 路线设置:

<route id="firstRoute">
    <from uri="..." />

    <!-- This processor puts a list of items as the out body -->
    <process ref="collectItemsProcessor" />

    <!-- Now all items should be processed one by one: -->
    <split>
        <simple>${body}</simple>
        <to uri="direct:secondRoute" />
    </split>
</route>

<route id="secondRoute">
    <from uri="direct:secondRoute" />

    <process ref="itemProcessor" />
</route>

在 itemProcessor 中，我想计算通过将属性放入交换中成功处理的项目数:

exchange.setProperty("PROCESSED_ITEMS", exchange.getProperty("PROCESSED_ITEMS", Integer.class) + 1);

由于某种原因，每次调用处理器时，该属性都会再次为 null。文档说:

The Exchange also holds meta-data during its entire lifetime stored as properties accessible using the various getProperty(String) methods.

https://camel.apache.org/maven/current/camel-core/apidocs/org/apache/camel/Exchange.html

最初在collectItemsProcessor中设置属性时，会保留该值。我怀疑每次调用分割路由时都会复制交换，但是我怎样才能真正保留“整个生命周期内的元数据”？

Answer 1

Split 为每个项目创建一个新的交换。此交换的生命周期仅涵盖 split 元素内部的内容。

如果您只想处理已处理元素的计数器，则只需使用属性“CamelSplitIndex”即可。拆分器会自动填充此属性。