[switchyard-issues] [JBoss JIRA] (SWITCHYARD-516) Add transaction support from Camel service bindings

[Daniel Bevenius (Created) (JIRA)]

Add transaction support from Camel service bindings
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                 Key: SWITCHYARD-516
                 URL: https://issues.jboss.org/browse/SWITCHYARD-516
             Project: SwitchYard
          Issue Type: Task
          Components: component-camel
            Reporter: Daniel Bevenius
            Assignee: Daniel Bevenius


This task should add transaction support for a Camel service binding. For example you could have a binding that looks like this:
{noformat}
<sca:service name="SimpleCamelService" promote="ComponentName/SimpleCamelService">
    <camel:binding.camel configURI="jms://TestQueue?connectionFactory=#ConnectionFactory" transacted="true"/>
</sca:service>
{noformat}

What will happen behind the scene is that an InboundHandler for this route will be created. This InboundHandler will create a camel route
that looks like this:
{noformat}
from("jms://TestQueue?connectionFactory=#ConnectionFactory")
.transacted() 
.to("switchyard://SimpleCamelService?namespace=urn:camel-core:test:1.0");
{noformat}
Normally the transaction policy to be used would be specified as a bean in a spring configuration xml element and referenced from the transacted method. If there is only one bean of type Policy that will be used as in the case above. The policy will be looked up in the Camel Registry, first using a reference to a bean if one was provided with the transacted method. If a bean reference was not provided it will look up the Policy using the type Policy. 

In SwitchYard we don't have the ability to specify beans using Spring XML. But since we control the creation of the route, we can specify a policy() instead of using the transacted() which enables us to configure a Spring JtaTransactionManager which can then be used when creating a custom SpringTransactionPolicy. So this might look something like this:
{noformat}
from("jms://TestQueue?connectionFactory=#ConnectionFactory")
.policy(customSpringTransactionPolicy) 
.to("switchyard://SimpleCamelService?namespace=urn:camel-core:test:1.0");
{noformat}

The JtaTransactionManager can be configured with a UserTransaction, a TransactionManager, JNDI names for these as well. So we should be able to specify a different JNDI location if required by AS7 for example.




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