一旦目录中的所有文件都已处理完毕，Camel Spring DSL就在bean上调用方法

Question

I am trying to achieve the following in Camel Spring DSL (Version 2.12.1).

• Read all files from a directory
• Process each file with an indexer bean
• Call a finalizeRepository method on the indexer bean once all files have been processed

(Based on the answer supplied by Claus I have updated the code sample below with a working solution.)

<route>
    <from uri="file:./dataToIndex" />
    <bean ref="indexer" method="addDocument(${body}, ${headers.CamelFileNameOnly})" />
    <when>
        <simple>${headers.CamelBatchComplete} == true</simple>
    <bean ref="indexer" method="finalizeRepository" />
    </when>
</route>

If the header CamelBatchComplete holds the value true the method finalizeRepository on the indexer bean will be called. The header is set to true once all documents in the dataToIndex directory have been processed.

The only thing I am not quite certain about is the definition of batch . Is a batch determined based on what is found during a single polling event (eg if 1k files are found in a directory then this constitutes the batch), or a pattern of polling event (ie a series of successfull polls with items followed by a poll without any items is considered a batch ).

Answer 1

The file component adds a header when its processing the last file in the batch. You can use that to know when its the last and call the bean.

This is done by other components which supports "batch" as you can find details here

• http://camel.apache.org/batch-consumer.html