20.23. 避免多次读取同一文件（幂等消费者）

from("file://inbox?idempotent=true").to("...");

from("file://inbox?idempotent=true").to("...");

<route>
  <from uri="file://inbox?idempotent=true&amp;idempotentKey=${file:name}-${file:size}"/>
  <to uri="bean:processInbox"/>
</route>

<route>
  <from uri="file://inbox?idempotent=true&amp;idempotentKey=${file:name}-${file:size}"/>
  <to uri="bean:processInbox"/>
</route>

 <!-- define our store as a plain spring bean -->
 <bean id="myStore" class="com.mycompany.MyIdempotentStore"/>

<route>
  <from uri="file://inbox?idempotent=true&amp;idempotentRepository=#myStore"/>
  <to uri="bean:processInbox"/>
</route>

 <!-- define our store as a plain spring bean -->
 <bean id="myStore" class="com.mycompany.MyIdempotentStore"/>

<route>
  <from uri="file://inbox?idempotent=true&amp;idempotentRepository=#myStore"/>
  <to uri="bean:processInbox"/>
</route>

DEBUG FileConsumer is idempotent and the file has been consumed before. Will skip this file: target\idempotent\report.txt

DEBUG FileConsumer is idempotent and the file has been consumed before. Will skip this file: target\idempotent\report.txt