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Posted to issues@camel.apache.org by "Claudio Corsi (JIRA)" <ji...@apache.org> on 2012/10/10 18:03:03 UTC

[jira] [Updated] (CAMEL-5579) Add an abstract grouped by aggregator strategy that users can extend from.

     [ https://issues.apache.org/jira/browse/CAMEL-5579?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Claudio Corsi updated CAMEL-5579:
---------------------------------

    Attachment: grouped-aggregate-strategy.tar.gz

Hi Andreas,

Here is a project that includes an example of how to use this feature that I was suggesting.  Keep in mind that this update will probably not be included with the distribution since this is not encouraged.

Regards,

--Claudio

                
> Add an abstract grouped by aggregator strategy that users can extend from.
> --------------------------------------------------------------------------
>
>                 Key: CAMEL-5579
>                 URL: https://issues.apache.org/jira/browse/CAMEL-5579
>             Project: Camel
>          Issue Type: Improvement
>          Components: camel-core
>            Reporter: Claudio Corsi
>            Assignee: Claus Ibsen
>            Priority: Minor
>              Labels: camel-core,
>             Fix For: 2.11.0
>
>         Attachments: AbstractGroupedByValueAggregationStrategy.java, grouped-aggregate-strategy.tar.gz, GroupedByExchangeAggregationStrategy.java
>
>
> The current GroupedExchangeAggregationStrategy will combine a list of exchange instances for a given correlation expression and propagate the exchange with that list.   This is great as long as users are content with processing the list of exchanges.  
> What about users that would like to extract data from the exchange and add that to the forwarded list?  This is something that require users to create their own strategy.
> What I propose is that we provide base class for users to extend such that it manages the grouped list and have the user state and return the type of instances that will be added to the grouped list.
> I will attach a base class that users can extend and an example of a sub-classed version that will return a list of exchange instances like the default GroupedExchangeAggregateStrategy camel core class.

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