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From "Claudio Corsi (JIRA)" <>
Subject [jira] [Commented] (CAMEL-5581) Add an ExchangeStrategy to the HBase Component.
Date Mon, 10 Sep 2012 14:48:07 GMT


Claudio Corsi commented on CAMEL-5581:

The reason that I added this suggestion was that if I wanted to retrieve some data from a
hbase repository but want to also log the original exchange after processing the hbase information
then in this case I am unable to do just that.  The hbase component does not provide the ability
to forward any data from the in-message to the out-message except for the hbase specific data.
 You are limited to what is retrieved from hbase and any other data is lost along the way.

There are ways that can be used to forward that information using for instance the dynamic
router pattern to route the message to its destination based on the hbase result but this
does not provide an ability to propagate the hbase data to the destination unless you add
all of that information on the required end point string returned.

Looking at the content enricher pattern, I see the use of this technique but in the prior
case.  Looking at the aggregation strategy example.  This technique will try to combine to
results into one but it does not seem to allow for the ability to use data from the in-coming
exchange to be used by the aggregating exchange. You would need to create a Processor that
uses the exchange in-coming message to setup a call to hbase and use the results in conjunction
with the in-message to generate the out-message that will be forwarded to the resulting endpoint.
 Your suggestion would require that the aggregate resource exchange instance would have to
use a general endpoint.  If you are using a really large hbase set of data.  You would want
to minimize the size of the returned data.  I do not see how that can be done unless you create
multiple endpoints which will clutter the application.

I might be wrong in my assessment and will look at this further and thanks for the feedback.
 It is greatly appreciated.

> Add an ExchangeStrategy to the HBase Component.
> -----------------------------------------------
>                 Key: CAMEL-5581
>                 URL:
>             Project: Camel
>          Issue Type: Improvement
>          Components: camel-hbase
>    Affects Versions: 2.10.1, 2.11.0
>            Reporter: Claudio Corsi
>            Assignee: Claus Ibsen
>            Priority: Minor
>             Fix For: 2.11.0, 2.10.2
>         Attachments: hbase-exchange-strategy.patch
> The current hbase component does not provide the ability to forward of the exchange information
except for the associated hbase data.  
> This improvement adds the concept of an ExchangeStrategy that users can extend and allow
them to include information from the current exchange in-coming message to the out-going message.
> I have a default implementation that does nothing that can be extended by a user.  This
default implementation can be extended in the future such that users will then not be required
to add missing methods.

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