Transactions and Flows for my use case

[angeloNZ <an...@nz.fujitsu.com>]

Hi,

I'm a little confused about SM's Transactions and Flows and how it should be
applied to my simple use case:

client -> http consumer -> camel -> http provider > external web service

I will not be creating or routing to any activemq endpoints inside the Camel
component nor perform any database operations.  I've read from the forum
that transactions depends on the choice of components as well as the choice
of flow to use.

I've left my flow configuration as default ( SM 3.3 )
<sm:broker>
      <sm:securedBroker authorizationMap="#authorizationMap">
        <sm:flows>
          <sm:sedaFlow />
          <sm:jmsFlow jmsURL="${activemq.url}" />
          <sm:jcaFlow connectionManager="#connectionManager"
                      jmsURL="${activemq.url}" />
        </sm:flows>
      </sm:securedBroker>
    </sm:broker>

1)  Given my use case and my config, which flow type will be used by SM upon
receiving a client request?
2)  Will a transaction be automatically started and at which point will it
be created?
3)  Considering that my camel component will only be doing throttling and
routing to http endpoints, are transactions even necessary?

After reading the  http://servicemix.apache.org/transactions.html
transactions  page and seeing the code examples, I got confused where to
code those in in relation to my use case.

Appreciate any clarifications.  Newbie here.  Thanks!



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Re: Transactions and Flows for my use case

[Gert Vanthienen <ge...@gmail.com>]

L.S.,

If you are just using Camel to route between the endpoints, you don't
need to use transactions at all.  The transaction is normally started
by the component (e.g. a JMS consumer endpoint can start a transaction
when it reads the message off the queue).  ServiceMix will select a
flow appropriate for your MessageExchange automatically.  In your
case, the HTTP endpoint won't be starting a transaction so it will
select the seda flow to convey the MessageExchange within the same
container.

The other flows are mostly used for clustering JBI containers.  If you
are not doing that, you might as well disable these two flows (i.e.
comment them out in the config file).  I often do that in a production
environment where they only have a single ServiceMix instance to
slightly lower the footprint of the running container.

Regards,

Gert Vanthienen
------------------------
Open Source SOA: http://fusesource.com
Blog: http://gertvanthienen.blogspot.com/



2009/2/19 angeloNZ <an...@nz.fujitsu.com>:
>
> Hi,
>
> I'm a little confused about SM's Transactions and Flows and how it should be
> applied to my simple use case:
>
> client -> http consumer -> camel -> http provider > external web service
>
> I will not be creating or routing to any activemq endpoints inside the Camel
> component nor perform any database operations.  I've read from the forum
> that transactions depends on the choice of components as well as the choice
> of flow to use.
>
> I've left my flow configuration as default ( SM 3.3 )
> <sm:broker>
>      <sm:securedBroker authorizationMap="#authorizationMap">
>        <sm:flows>
>          <sm:sedaFlow />
>          <sm:jmsFlow jmsURL="${activemq.url}" />
>          <sm:jcaFlow connectionManager="#connectionManager"
>                      jmsURL="${activemq.url}" />
>        </sm:flows>
>      </sm:securedBroker>
>    </sm:broker>
>
> 1)  Given my use case and my config, which flow type will be used by SM upon
> receiving a client request?
> 2)  Will a transaction be automatically started and at which point will it
> be created?
> 3)  Considering that my camel component will only be doing throttling and
> routing to http endpoints, are transactions even necessary?
>
> After reading the  http://servicemix.apache.org/transactions.html
> transactions  page and seeing the code examples, I got confused where to
> code those in in relation to my use case.
>
> Appreciate any clarifications.  Newbie here.  Thanks!
>
>
>
> --
> View this message in context: http://www.nabble.com/Transactions-and-Flows-for-my-use-case-tp22092994p22092994.html
> Sent from the ServiceMix - User mailing list archive at Nabble.com.
>
>