call subflow with in mule3 webservice

Question

I created a Mule3 Simple Front-end Web Service which is supposed to pass the XML message to a sub-flow and returns success to its caller.

mule-config.xml

---

Answer 1

Invoking a sub-flow from code is no small feat but possible.

Here is a test component that does invoke a sub-flow injected in it:

public class TestComponent implements MuleContextAware, FlowConstructAware
{
    private MuleContext muleContext;
    private FlowConstruct flowConstruct;
    private MessageProcessor subFlow;

    public void initialize() throws MuleException
    {
        muleContext.getRegistry().applyProcessorsAndLifecycle(subFlow);
    }

    public String test(final String requestMessage) throws Exception
    {

        final MuleEvent muleEvent = new DefaultMuleEvent(new DefaultMuleMessage(requestMessage, muleContext),
            MessageExchangePattern.REQUEST_RESPONSE, flowConstruct);
        final MuleEvent resultEvent = subFlow.process(muleEvent);

        return resultEvent.getMessageAsString();
    }

    public void setMuleContext(final MuleContext muleContext)
    {
        this.muleContext = muleContext;
    }

    public void setFlowConstruct(final FlowConstruct flowConstruct)
    {
        this.flowConstruct = flowConstruct;
    }

    public void setSubFlow(final MessageProcessor subFlow)
    {
        this.subFlow = subFlow;
    }
}

The component is configured this way:

<spring:beans>
    <spring:bean name="testComponent" class="com.example.TestComponent"
        p:subFlow-ref="testSubFlow" init-method="initialize" />
</spring:beans>

...

    <component>
        <spring-object bean="testComponent" />
    </component>

Answer 2

I solved this problem by using singleton instance to store requestMessage with in test() method of WebserviceTestImpl class and retrieve it in TestSubflow component. I am not sure if it is perfect. but it works:)

Here is how I did it..

mule-config:

---

<flow name="webserviceTestFlow">
  <http:inbound-endpoint address="${webservicetest.env.endpoint}" exchange-pattern="request-response" doc:name="HTTP"/>
  <cxf:simple-service serviceClass="com.test.WebserviceTest" doc:name="SOAP"/>
  <component class="com.test.WebserviceTestImpl" />
  <flow-ref name="testSubflow"/>
</flow>

<sub-flow name="testSubflow">
    <pooled-component class="com.test.TestSubflow">
        <pooling-profile exhaustedAction="WHEN_EXHAUSTED_FAIL" initialisationPolicy="INITIALISE_ALL" maxActive="1" maxIdle="2" maxWait="3" />
    </pooled-component>
</sub-flow>

WebserviceTestImpl and TestSubflow code snippet

---

public class WebserviceTestImpl implements WebserviceTest,Serializable {
    private static final long serialVersionUID = 1L;
    private TestMessageProxy testMessageProxy;

    public TriggerTestImpl() {
        this.testMessageProxy = TestMessageProxy.getInstance();
    }
    @Override
    public String test(String requestMessage) throws Exception{
        this.testMessageProxy.setTestMessage(requestMessage);
        return "success";
    }
}

public class TestSubflow  implements Callable{
    private TestMessageProxy testMessageProxy;
    public TestSubflow() {
        this.testMessageProxy = TestMessageProxy.getInstance();
    }

    @Override
    public Object onCall(MuleEventContext context) throws Exception {
        String  testMessage = this.testMessageProxy.getTestMessage();
    }
}