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Chapter 20. Debugging

20.1. Message Tracing
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Message tracing provides a view of the content and context of a message exchange on the SwitchYard bus. Message tracing prints exchange information to the log. An exchange interceptor that generates the trace, is triggered at the following points:
  • Immediately after the consumer sends the request message. For example, In the case of a service which is invoked from a service binding, this is the point at which the gateway binding puts the message onto the bus.
  • Immediately before the service provider is invoked.
  • Immediately after the service provider is invoked.
  • At completion of the exchange before the message is returned to the consumer.

20.1.1. Trace Output Example
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Trace output includes details on the metadata, context properties, payload, and attachments for a message exchange. Here is an example of a trace entry: 
12:48:25,038 INFO  [org.switchyard.handlers.MessageTraceHandler]
------- Begin Message Trace -------
Consumer -> {urn:switchyard-quickstart:bean-service:0.1.0}OrderService
Provider -> [unassigned]
Operation -> submitOrder
MEP -> IN_OUT
Phase -> IN
State -> OK
Exchange Context ->
    org.switchyard.bus.camel.consumer : ServiceReference [name={urn:switchyard-quickstart:bean-service:0.1.0}OrderService, interface=BaseServiceInterface [type=wsdl, operations=[submitOrder : IN_OUT : [{urn:switchyard-quickstart:bean-service:1.0}submitOrder, {urn:switchyard-quickstart:bean-service:1.0}submitOrderResponse, null]]], domain=ServiceDomain [name=org.switchyard.domains.root]]
    org.switchyard.exchangeGatewayName : _OrderService_soap_1
    org.switchyard.bus.camel.securityContext : SecurityContext[credentials=[ConfidentialityCredential [confidential=false]], securityDomainsToSubjects={}]
    org.switchyard.exchangeInitiatedNS : 1375980505021790000
    CamelCreatedTimestamp : Thu Aug 08 12:48:25 EDT 2013
    org.switchyard.bus.camel.phase : IN
    org.switchyard.bus.camel.dispatcher : org.switchyard.bus.camel.ExchangeDispatcher@b4aa453
    org.switchyard.bus.camel.labels : {org.switchyard.exchangeGatewayName=[org.switchyard.label.behavior.transient]}
    CamelToEndpoint : direct://%7Burn:switchyard-quickstart:bean-service:0.1.0%7DOrderService
    org.switchyard.bus.camel.contract : org.switchyard.metadata.BaseExchangeContract@2176feaf
    org.switchyard.bus.camel.replyHandler : org.switchyard.component.common.SynchronousInOutHandler@516a4aef
    CamelFilterMatched : false
Message Context ->
    org.switchyard.bus.camel.labels : {org.switchyard.contentType=[org.switchyard.label.behavior.transient], org.switchyard.bus.camel.messageSent=[org.switchyard.label.behavior.transient]}
    org.switchyard.messageId : ID-kookaburra-local-49858-1375980502093-0-1
    org.switchyard.bus.camel.messageSent : true
    org.switchyard.soap.messageName : submitOrder
    org.switchyard.contentType : {urn:switchyard-quickstart:bean-service:1.0}submitOrder
    breadcrumbId : ID-kookaburra-local-49858-1375980502093-0-1
Message Content ->
<?xml version="1.0" encoding="UTF-8"?><orders:submitOrder xmlns:orders="urn:switchyard-quickstart:bean-service:1.0">
            <order>
                <orderId>PO-19838-XYZ</orderId>
                <itemId>BUTTER</itemId>
                <quantity>200</quantity>
            </order>
        </orders:submitOrder>
------ End Message Trace -------
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20.1.2. Enabling Message Tracing
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You can enable message tracing within JBoss Developer Studio.
  • When using the SwitchYard visual editor to view the switchyard.xml file, select the Domain tab to view the Domain Settings, then select the Enable Message Trace check box.
This sets the value of the org.switchyard.handlers.messageTrace.enabled property to true in your application domain. This is captured by the <sy:domain> element in the switchyard.xml source file.
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