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From Christian Müller (JIRA) <j...@apache.org>
Subject [jira] [Commented] (CAMEL-4118) Improve the Aggregator to be able to force a flush all aggregated exchanges
Date Sun, 19 Jun 2011 11:46:47 GMT

    [ https://issues.apache.org/jira/browse/CAMEL-4118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13051674#comment-13051674
] 

Christian Müller commented on CAMEL-4118:
-----------------------------------------

Instead of calling "getKeys" on the aggregator, we could also provide a AggregationStrategy
on the Splitter directly, which will collect all the aggregation keys. In this case the bean
can take the list of keys from the exchange.

> Improve the Aggregator to be able to force a flush all aggregated exchanges
> ---------------------------------------------------------------------------
>
>                 Key: CAMEL-4118
>                 URL: https://issues.apache.org/jira/browse/CAMEL-4118
>             Project: Camel
>          Issue Type: Improvement
>    Affects Versions: 2.7.2
>            Reporter: Christian Müller
>             Fix For: 2.9.0
>
>
> Imagine you process a big file with multiple financial transactions. After splitting
the file into its individual transactions, we send they to an aggregator to group transactions
for the same card/account together. At this time, we don't know how many transactions we have
to group together. Only at the end of processing the input file, we know that we are done.
At this time, we have to instruct the aggregator to "flush all aggregated exchanges".
> A workaround for the time being is, to inject the aggregator also into a bean which is
called after the splitter. This bean can query for all keys with the "getKeys" method and
than send a "flush" exchange to the aggregator (completionPredicate(header("flush"))). However
it will still aggregate that "flush exchange". So take care of that in your custom aggregation
strategy and enable eagerCheckCompletion, so the predicate is checked before aggregating.
> We had a similar question on the user list to "flush all aggregated exchanges" when Camel
shut down.

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