[esb-java-user] Returning response from a mediator

Fri Jul 6 03:26:32 PDT 2007

Thanks, that works.

________________________________

From: esb-java-user-bounces at wso2.org
[mailto:esb-java-user-bounces at wso2.org] On Behalf Of Asankha C. Perera
Sent: Friday, July 06, 2007 3:50 PM
To: esb-java-user at wso2.org
Subject: Re: [esb-java-user] Returning response from a mediator

Siva

Oh ok, I am sorry.. seems like your client is not using WS-Addressing.
So you really don't have a ReplyTo in your incoming message which
explains the problem.  Just remove the "To" header then and that will do
for this scenario.

The reasoning behind this is that over HTTP an incoming message to a
Proxy say Echo would have a value of "/soap/Echo" which you usually
would want to use for routing decisions. However, when sending a
response, the "To" field should have a valid EPR (e.g. like the ReplyTo
EPR sent by the client over which it is expecting the response) or
should be null, so that the ESB will know that the message is a response
and would know to send it back over the same transport. However for
example if you are using JMS in this situation - you may want to set the
"To" header in a similar situation to some other queue maybe..

I have attached the definition for a sample Echo service this way.

    <syn:proxy name="Echo" startOnLoad="true">
        <syn:target>
            <syn:inSequence>
                <syn:property name="RESPONSE" value="true"/>
                <syn:header name="To" action="remove"/>
                <syn:send/>
            </syn:inSequence>
            <syn:outSequence>
                <syn:send/>
            </syn:outSequence>
        </syn:target>
    </syn:proxy>

Now when I try this (i.e. without ws-addressing), I get the same request
echoed back as can be seen below:

asankha at asankha:/opt/wso2esb-1.0/samples/axis2Client$ ant stockquote
-Dtrpurl=http://localhost:8080/soap/Echo
...
     [java] java.lang.Exception: Unexpected response :
<m0:getQuotexmlns:m0="http://services.samples/xsd"
<http://services.samples/xsd>
><m0:request><m0:symbol>IBM</m0:symbol></m0:request></m0:getQuote>
...

Hope this helps

regards
asankha

Soundarapandian, Sivakumar wrote: 

I tried this with 

<proxy name="TMWAdapterProxy">

        <target>

            <inSequence>

                                    <class
name="com.atroad.mediator.TMWMockMediator"/>

                                                <property
name="RESPONSE" value="true"/>

                                                <header name="To"
expression="get-property('ReplyTo')"/>

                        <send/>

            </inSequence> 

                                    <outSequence>

                                    </outSequence>

        </target>

    </proxy>

Currently my mediator is not doing anything other than doing a println.
So I would expect the same request to comeback as response. But I am
getting the following error. Am I missing something?

DEBUG [06 Jul 15:11:09]  PropertyMediator - Property mediator ::
mediate()

DEBUG [06 Jul 15:11:09]  PropertyMediator - Setting : RESPONSE property
(scope:d

efault) = true

DEBUG [06 Jul 15:11:09]  HeaderMediator - Header mediator <Set> ::
mediate()

 INFO [06 Jul 15:11:09]  ESBRegistry - ==> Repository fetch of resource
with key

 : ReplyTo

DEBUG [06 Jul 15:11:09]  HeaderMediator - Setting header : To to : null

DEBUG [06 Jul 15:11:09]  SendMediator - Send mediator :: mediate()

DEBUG [06 Jul 15:11:09]  SendMediator - Sending message using implicit
message p

roperties..

DEBUG [06 Jul 15:11:09]  SendMediator - Sending To: null

DEBUG [06 Jul 15:11:09]  SendMediator - SOAPAction: urn:anonOutInOp

DEBUG [06 Jul 15:11:09]  SendMediator - Body :

<?xml version='1.0' encoding='utf-8'?><soapenv:Envelope
xmlns:soapenv="http://sc

hemas.xmlsoap.org/soap/envelope/"><soapenv:Body><m0:getForm
xmlns:m0="http://ser

vices.samples/xsd"><m0:formId>100</m0:formId></m0:getForm></soapenv:Body
></soape

nv:Envelope>

ERROR [06 Jul 15:11:09]  HttpCoreNIOSender - Malformed destination EPR :
null

java.net.MalformedURLException

        at java.net.URL.<init>(URL.java:601)

        at java.net.URL.<init>(URL.java:464)

        at java.net.URL.<init>(URL.java:413)

        at
org.apache.axis2.transport.nhttp.HttpCoreNIOSender.sendAsyncRequest(H

ttpCoreNIOSender.java:261)

        at
org.apache.axis2.transport.nhttp.HttpCoreNIOSender.invoke(HttpCoreNIO

Sender.java:210)

        at
org.apache.axis2.engine.AxisEngine$TransportNonBlockingInvocationWork

er.run(AxisEngine.java:571)

        at
edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Wor

ker.runTask(ThreadPoolExecutor.java:665)

        at
edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Wor

ker.run(ThreadPoolExecutor.java:690)

        at java.lang.Thread.run(Thread.java:595)

 INFO [06 Jul 15:11:09]  AxisEngine - [MessageContext:
logID=urn:uuid:DDFC49319B

A42BC34A1183714870265] Malformed destination EPR : null

________________________________

From: esb-java-user-bounces at wso2.org
[mailto:esb-java-user-bounces at wso2.org] On Behalf Of Asankha C. Perera
Sent: Friday, July 06, 2007 2:16 PM
To: esb-java-user at wso2.org
Subject: Re: [esb-java-user] Returning response from a mediator

Hi Siva

The sample #7
<https://wso2.org/project/esb/java/1.0/docs/ESB_Samples.html#Sample7>
shows how to create a custom fault message (when a validation fails) and
change the direction of this message to a "response" and then send it
back to the client.

So if your MockMediator handles the incoming message and creates the
response to be sent back, you could to the following after your
mediator. Note that a mediator has state (i.e. an instance for each
occurrence in a configuration) and may be shared by multiple threads.

<property name="RESPONSE" value="true"/>
<header name="To" expression="get-property('ReplyTo')"/>
<send/>

thanks
asankha

Asankha C. Perera wrote: 

Forwarding this mail from Siva that somehow bounced.. - asankha

Hi,

I have a proxy that does not have an end point. I have a class mediator
and the request is received by the mediator. I want to return a response
from the mediator. How can I do that? Here is the configuration I have

<definitions xmlns="http://ws.apache.org/ns/synapse"
<http://ws.apache.org/ns/synapse> >

    <proxy name="TestAdapterProxy">

        <target>

            <inSequence>

                                    <class
name="com.atroad.mediator.MockMediator"/>

            </inSequence> 

                                    <outSequence>

                                                <send/>

                                    </outSequence>

        </target>

    </proxy>

</definitions>

Thanks,

Siva

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