{section}
{column}

h1. Integration Pattern supported


* Aggregator
* Bridge
* Dispatcher
* Router
* DynamicRouter
* RoutingSlip
* ScatterGather
* WireTap
* Splitter

h1. Service Configuration

h2. Service Unit descriptor

{code:lang=xml}
<?xml version="1.0" encoding="UTF-8"?>
<jbi:jbi version="1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jbi="http://java.sun.com/xml/ns/jbi"
xmlns:petalsCDK="http://petals.ow2.org/components/extensions/version-5"
xmlns:eip="http://petals.ow2.org/components/eip/version-2"
xmlns:sample="http://petals.ow2.org/sample">
<jbi:services binding-component="false">
<!-- The Provides -->
<jbi:provides interface-name="sample:interface" service-name="sample:service"
endpoint-name="endpoint">
<petalsCDK:wsdl xsi:nil="true" />
<eip:eip>pattern</eip:eip>
</jbi:provides>
<!-- The first Consumes -->
<jbi:consumes interface-name="sample:calledInterface1" service-name="sample:calledService1"
endpoint-name="calledEndpoint1">
<petalsCDK:mep xsi:nil="true" />
</jbi:consumes>
<!-- The second Consumes -->
<jbi:consumes interface-name="sample:calledInterface2" service-name="sample:calledService2"
endpoint-name="calledEndpoint2">
<petalsCDK:mep xsi:nil="true" />
</jbi:consumes>
</jbi:services>
</jbi:jbi>
{code}

{include:0 CDK SU Provide Configuration}
\\
{include:0 JBI SU Consume Configuration}
\\
{include:0 CDK SU Interceptor configuration}

h3. Processing an integration pattern

Processing a pattern is providing a service that invokes 'sub-services', this service is called the 'original' service and its caller the 'original' consumer.

A Service Unit contains one and only one {{Provides}} section, which describes the pattern that will be processed when a request message is received.

The Service Unit contains also one or more {{Consumes}} sections, which reference services to invoke during the pattern processing. The order of the {{consumes}} sections is important, as it is the order taken account when a pattern need 'sub-service' coordination.

The number of {{consumes}} sections depends on the pattern implemented.

If the MEP {{InOut}} or {{InOptionalOut}} are supported by a pattern, the component returns to the original consumer an {{OUT}} or {{FAULT}} response built according to the pattern feature.

If an invoked service returns a {{Fault}} or an {{Error}} status, the behavior of process can be configured:
* The process can terminate and the {{Fault}} or the {{Error}} is sent back to the 'original' consumer
* The process can continue, ignoring the {{Fault}} or the {{Error}} received

{note:title=Caution}The MEP is mandatory for each consumes sections.{note}
{note:title=Caution}Either an operation must be specified in the consumes sections or the 'original' operation is used for 'sub-service' requests.{note}

h3. Aggregator Pattern

*Enterprise Integration Pattern*
{center} !aggregator.gif!{center}

{center}{*}Configuration of a Service Unit to provide a service (Aggregator)*{center}

{table-plus}

| test | XPath condition applied on the message to complete or not the sequence and invoke the 'sub-service' | {center}\-{center} |
| aggregator-correlation | XPath condition that is applied on the incoming message to correlate them together | {center}\-{center} |
{table-plus}
\\
The EIP Component receives 'original' exchanges and correlates their content amongst the aggregation configurations. The correlation is identified from the XPath expression specified in the SU parameter {{aggregator-correlation}}. If an 'original' exchange is on a {{InOut}} or {{InOptionalOut}} MEP, a standard response is sent back to the 'original' consumer :

{code:xml}
<result xmlns="http://petals.ow2.org/petals-se-eip/aggregator">
Aggregator: the content is buffered by the pattern
</result>
{code}

The exchange messages matching an {{aggregator-correlation}} condition are stored in memory.
Once an 'original' exchange message matches the XPath expression specified in the SU parameter {{test}}, the message and the previous stored messages on the condition {{aggregator-correlation}} are aggregated and send to the target 'sub-service'.
The current 'original' exchange properties are copied into the target exchange.
The aggregated content is the result of a concatenation of the messages in the following form :

{code:xml}
<result xmlns="http://petals.ow2.org/petals-se-eip/aggregator">
...
</result>
{code}

The result of the 'sub-service' is sent back to the 'original' consumer of the last aggregated exchange.

An example of Service Unit configuration for the *aggregator* pattern :

{code:xml}
<?xml version="1.0" encoding="UTF-8"?>
<!-- JBI descriptor for the PEtALS component "EIP"-->
<jbi:jbi version="1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jbi="http://java.sun.com/xml/ns/jbi"
xmlns:petalsCDK="http://petals.ow2.org/components/extensions/version-5"
xmlns:eip="http://petals.ow2.org/components/eip/version-2"
xmlns:test="http://petals.ow2.org/test">

<jbi:services binding-component="false">
<jbi:provides
interface-name="test:aggregator"
service-name="test:aggregatorService1"
endpoint-name="aggregatorService1Endpoint">
<petalsCDK:wsdl xsi:nil="true" />
<eip:eip>aggregator</eip:eip>
<eip:aggregator-correlation>/*[local-name()='helloworld']/text()</eip:aggregator-correlation>
<eip:test>
boolean(/*[local-name()='helloworld' and namespace-uri()='http://petals.ow2.org/test3'])
</eip:test>
</jbi:provides>

<jbi:consumes interface-name="test:aggregateProvider"
service-name="test:aggregateProviderService1"
endpoint-name="aggregateProviderService1Endpoint">
<petalsCDK:operation xmlns:petals="http://org.ow2.petals">petals:operation</petalsCDK:operation>
<petalsCDK:mep>InOnly</petalsCDK:mep>
</jbi:consumes>
</jbi:services>
</jbi:jbi>
{code}

{note:title=Caution}Message order is kept from incoming sequence to the outgoing message.{note}
{note:title=Caution}{{{}Consumes}} sections cardinality is \[1-1\].{note}
{note:title=Caution}All MEPs are accepted for the 'original' consumer.{note}

h3. Scatter-Gather Pattern

*Enterprise Integration Pattern*
{center} !scattergather.gif!{center}
\\
{center}{*}Configuration of a Service Unit to provide a service (Scatter-Gather)*{center}
{table-plus}

| fault-robust | If true, a fault returned by a 'sub-service' exchange do not interrupt the process of the pattern | {center}false{center} |
| exception-robust | If true, an exception thrown by a 'sub-service' exchange do not interrupt the process of the pattern | {center}false{center} |
{table-plus}
\\
The EIP Component forwards the message to all the configured 'sub-service(s)'. The component waits for all the responses from these services, and aggregates them.
The aggregation is returned to the 'original' consumer in the following form :

{code:xml}
<result xmlns="http://petals.ow2.org/petals-se-eip/scatter-gather">
...
</result>
{code}

An example of Service Unit configuration for the *scatter-gather* pattern :

{code:xml}
<?xml version="1.0" encoding="UTF-8"?>
<!-- JBI descriptor for the PEtALS component "EIP"-->
<jbi:jbi version="1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jbi="http://java.sun.com/xml/ns/jbi"
xmlns:petalsCDK="http://petals.ow2.org/components/extensions/version-5"
xmlns:eip="http://petals.ow2.org/components/eip/version-2"
xmlns:test="http://petals.ow2.org/test">

<jbi:services binding-component="false">
<jbi:provides
interface-name="test:scatterGather"
service-name="test:scatterGatherService1"
endpoint-name="scatterGatherService1Endpoint">
<petalsCDK:wsdl xsi:nil="true" />
<eip:eip>scatter-gather</eip:eip>
</jbi:provides>

<jbi:consumes interface-name="test:scatterGatherProvider"
service-name="test:scatterGatherProviderService1"
endpoint-name="scatterGatherProviderService1Endpoint">
<petalsCDK:mep>InOut</petalsCDK:mep>
<petalsCDK:operation xmlns:petals="http://org.ow2.petals">petals:operation</petalsCDK:operation>
</jbi:consumes>

<jbi:consumes interface-name="test:scatterGatherProvider"
service-name="test:scatterGatherProviderService2"
endpoint-name="scatterGatherProviderService2Endpoint">
<petalsCDK:mep>InOut</petalsCDK:mep>
<petalsCDK:operation xmlns:petals="http://org.ow2.petals">petals:operation</petalsCDK:operation>
</jbi:consumes>
</jbi:services>
</jbi:jbi>
{code}

{note:title=Caution}{{{}Consumes}} sections cardinality is \[1-n\].{note}
{note:title=Caution}Message exchange pattern accepted from the 'original' consumer is {{InOut}}.{note}
{note:title=Caution}By default, the process stops when a Fault is returned by a 'sub-service'. To continue the process even if a fault is returned, set the {{fault-robust}} parameter to {{TRUE}}. The fault is concatenated with the others results.{note}
{note:title=Caution}By default, the process stops when an Exception is returned by a 'sub-service'. To continue the process even if an exception is thrown, set the {{exception-robust}} to {{TRUE}}. The exception is concatenated with the others results.{note}

h3. Routing-Slip Pattern

*Enterprise Integration Pattern*
{center} !routingslip.gif!{center}

{center}{*}Configuration of a Service Unit to provide a service (Routing Slip)*{center}

{table-plus}

| fault-to-exception | If true, a fault received from a 'sub-service' service is transformed to an exception into the 'original' exchange. | {center}false{center} |
{table-plus}
\\
The EIP Component chains invocation of the 'sub-services', in the order that they are declared. The {{IN}} message of the incoming exchange is sent to the first 'sub-service', the {{OUT}} response of this service is sent to the second 'sub-service' as a {{IN}} message, and so on. The last exchange is matched with the 'original' exchange as better as possible:
* If the source exchange needs a response ({{InOut}} patterns) and no response are received ({{InOnly}}, {{RobustInOnly}} patterns), a default response is returned :
{code:lang=xml}<result xmlns="http://petals.ow2.org/petals-se-eip/bridge">
Bridge: no content into the final target exchange
</result>{code}
* If the 'original' exchange do not accept a response ({{InOnly}} or {{RobustInOnly}} patterns) and a response is received ({{InOut}} or {{InOptionalOut}} patterns), the response is ignored.
* If the 'original' exchange do not accept a fault ({{InOnly}} pattern) and a fault is received ({{RobustInOnly}}, {{InOut}} or {{InOptionalOut}} patterns), the fault is ignored.

An example of Service Unit configuration for the *Routing-Slip* pattern:
{code:lang=xml}<?xml version="1.0" encoding="UTF-8"?>

<!-- JBI descriptor for the PEtALS component "EIP"-->
<jbi:jbi version="1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jbi="http://java.sun.com/xml/ns/jbi"
xmlns:petalsCDK="http://petals.ow2.org/components/extensions/version-5"
xmlns:eip="http://petals.ow2.org/components/eip/version-2"
xmlns:test="http://petals.ow2.org/test">

<jbi:services binding-component="false">
<jbi:provides
interface-name="test:routingSlip"
service-name="test:routingSlipService1"
endpoint-name="routingSlipService1Endpoint">

<petalsCDK:wsdl xsi:nil="true" />
<eip:eip>routing-slip</eip:eip>
<eip:fault-to-exception>false</eip:fault-to-exception>
</jbi:provides>

<jbi:consumes interface-name="test:routingSlipProvider"
service-name="test:routingSlipProviderService1"
endpoint-name="routingSlipProviderService1Endpoint">

<petalsCDK:mep>InOut</petalsCDK:mep>
<petalsCDK:operation xmlns:petals="http://org.ow2.petals">petals:operation</petalsCDK:operation>
</jbi:consumes>

<jbi:consumes interface-name="test:routingSlipProvider"
service-name="test:routingSlipProviderService2"
endpoint-name="routingSlipProviderService2Endpoint">

<petalsCDK:mep>InOut</petalsCDK:mep>
<petalsCDK:operation xmlns:petals="http://org.ow2.petals">petals:operation</petalsCDK:operation>
</jbi:consumes>
</jbi:services>
</jbi:jbi>{code}
\\
{note:title=Caution}{{{}Consumes}} sections cardinality is \[1-n\].{note}
{note:title=Caution}By default, the process stops when a Fault is returned or an exception is raised by a 'sub-service'.{note}
{note:title=Caution}MEP of all the 'sub-services' must be set to {{InOut}}, except the last one which can be accorded to the 'original' MEP.{note}
{note:title=Caution}All the MEP are accepted from the 'original' consumer.{note}

h3. Wire-Tap Pattern

*Enterprise Integration Pattern*
{center} !wiretap.gif!{center}

{center}{*}Configuration of a Service Unit to provide a service (Wire-Tap)*{center}
{table-plus}

| wiretap-way | Specify the step of a MEP on which the message should be copied and sent to the 'sub-service'. \\
Values can be {{request}} (copy {{IN}}), {{response}} (copy {{OUT}}/{{FAULT}}), {{request-response}} (copy {{IN}} and {{OUT}}/{{FAULT}}), {{request-on-response}} (copy {{IN}} after {{OUT}} is received; no copy if {{FAULT}} received) | {center}\-{center} |
{table-plus}
\\
The EIP component acts a proxy to a target 'sub-service'. It intercepts the {{IN}} or {{OUT/FAULT}} messages during the exchange and relays it to a observer 'sub-service'.
The SU parameter {{wiretap-way}} determines at which step of the MEP and which message is relayed to the observer 'sub-service'.
The copied message is sent to the 'observer' service as an {{IN}} message using the {{InOnly}} exchange pattern.
The first {{Consumes}} section refers the target 'sub-service', the second one refers the observer 'sub-service'.

{note:title=Caution}{{{}Consumes}} sections cardinality is 2.{note}
{note:title=Caution}MEP of the target 'sub-service', the observer 'sub-service' is {{InOnly}}.{note}
{note:title=Caution}All the MEP are accepted from the 'original' consumer.{note}


h3. Splitter Pattern

*Enterprise Integration Pattern*
{center} !splitter.gif!{center}

{center}{*}Configuration of a Service Unit to provide a service (Splitter)*{center}
{table-plus}

| test | XPath condition applied on the message to split from the 'original' exchange | {center}\-{center} |
| attachment | true to split the attachments of the incoming 'original' exchange, false to split against the {{test}} XPath expression on the In 'original' message | {center}false{center} |
| fault-robust | If true, a fault returned by a 'sub-service' exchange do not interrupt the process of the pattern | {center}false{center} |
| exception-robust | If true, an exception thrown by a 'sub-service' exchange do not interrupt the process of the pattern | {center}false{center} |
{table-plus}
\\
For this pattern, the EIP Component splits the incoming 'original' message to multiple messages, then send them to the configured 'sub-service'.
If {{attachment}} parameter is not set, the {{IN}} message of the exchange is split against the Xpath expression specified in the parameter {{test}}.
If {{attachment}} parameter is set to true, The attachments contained in the 'original' exchange is split, element by element, to new messages.
Each message split is sent to the configured 'sub-service'.

The aggregation of the responses is returned to the 'original' consumer, in the following form :
{code:lang=xml}<result xmlns="http://petals.ow2.org/petals-se-eip/splitter">
...
</result>
{code}

An example of Service Unit configuration for the *Splitter* pattern :
{code:lang=xml}
<?xml version="1.0" encoding="UTF-8"?>

<!-- JBI descriptor for the PEtALS component "EIP" -->
<jbi:jbi version="1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jbi="http://java.sun.com/xml/ns/jbi"
xmlns:petalsCDK="http://petals.ow2.org/components/extensions/version-5"
xmlns:eip="http://petals.ow2.org/components/eip/version-2"
xmlns:test="http://petals.ow2.org/test">

<jbi:services binding-component="false">
<jbi:provides
interface-name="test:splitter"
service-name="test:splitterService1"
endpoint-name="splitterService1Endpoint">

<petalsCDK:wsdl xsi:nil="true" />
<eip:eip>splitter</eip:eip>
<eip:test>
/*[local-name()='helloworld' and namespace-uri()='http://petals.ow2.org/test']/*[local-name()='split']
</eip:test>
<eip:fault-robust>false</eip:fault-robust>
<eip:exception-robust>false</eip:exception-robust>
<eip:attachment-mode>false</eip:attachment-mode>
</jbi:provides>

<jbi:consumes interface-name="test:splitterProvider"
service-name="test:splitterProviderService1"
endpoint-name="splitterProviderService1Endpoint">
<petalsCDK:operation xmlns:petals="http://org.ow2.petals">petals:operation</petalsCDK:operation>
<petalsCDK:mep>InOut</petalsCDK:mep>
</jbi:consumes>
</jbi:services>
</jbi:jbi>{code}

{note:title=Caution}{{{}consumes}} sections cardinality is 1.{note}
{note:title=Caution}MEP accepted from the 'original' consumer is {{InOut}}.{note}
{note:title=Caution}By default, the process stops when a Fault is returned by a 'sub-service'. To continue the process even if a fault is returned, set the {{fault-robust}} parameter to {{TRUE}}. The fault is concatenated with the others results.{note}
{note:title=Caution}By default, the process stops when an Exception is returned by a 'sub-service'. To continue the process even if an exception is thrown, set the {{exception-robust}} to {{TRUE}}. The exception is concatenated with the others results.{note}

h3. Bridge Pattern

*Enterprise Integration Pattern*
{center} !bridge.gif!{center}

{center}{*}Configuration of a Service Unit to provide a service (Bridge)*{center}

| fault-to-exception | If true, a fault received from a 'sub-service' service is transformed to an exception into the 'original' exchange. | {center}false{center} |
{table-plus}
\\
The EIP Component acts as exchange MEP bridge. For instance, it transforms an {{InOnly}} invocation into an {{InOut}} one. It is useful to correlate incompatible MEPs services.
Define in the {{Consumes}} section the 'sub-service' to invoke with its MEP, and the EIP component will match the incoming 'original' exchange against the outgoing exchange patterns as best as possible :
* If the 'original' exchange demands a response ({{InOut}} patterns) and no response are received ({{InOnly}},
{{RobustInOnly}} or {{InOptionalOut}} patterns), a default response is returned in the following form:
{code:lang=xml}<result xmlns="http://petals.ow2.org/petals-se-eip/bridge">
Bridge: no response from the last 'sub-service'
</result>{code}
* If the 'original' exchange do not expect a response ({{InOnly}} or {{RobustInOnly}} patterns) and a response is received ({{InOut}} or {{InOptionalOut}} patterns), the response is ignored.
* If the 'original' exchange do not expect a fault ({{InOnly}} pattern) and a fault is received ({{RobustInOnly}}, {{InOut}} or {{InOptionalOut}} patterns), the fault is ignored.

An example of Service Unit configuration for the *bridge* pattern :
{code:lang=xml}<?xml version="1.0"?>

<!-- JBI descriptor for the PEtALS component "EIP" -->
<jbi:jbi version="1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jbi="http://java.sun.com/xml/ns/jbi"
xmlns:petalsCDK="http://petals.ow2.org/components/extensions/version-5"
xmlns:eip="http://petals.ow2.org/components/eip/version-2"
xmlns:test="http://petals.ow2.org/test">

<jbi:services binding-component="false">
<jbi:provides
  interface-name="test:splitter"
  service-name="test:splitterService1"
  endpoint-name="splitterService1Endpoint">


<petalsCDK:wsdl xsi:nil="true" />
  <eip:eip>splitter</eip:eip>
  <eip:fault-to-exception>false</eip:fault-to-exception>
  <eip:test>
/*[local-name()='helloworld' and namespace-uri()='http://petals.ow2.org/test']/*[local-name()='split']
</eip:test>
  <eip:fault-robust>false</eip:fault-robust>
  <eip:exception-robust>false</eip:exception-robust>
  <eip:attachment-mode>false</eip:attachment-mode>
</jbi:provides>

<jbi:consumes interface-name="test:splitterProvider"
  service-name="test:splitterProviderService1"
  endpoint-name="splitterProviderService1Endpoint">
  <petalsCDK:operation xmlns:petals="http://org.ow2.petals">petals:operation</petalsCDK:operation>
  <petalsCDK:mep>InOut</petalsCDK:mep>
 </jbi:consumes>
</jbi:services>
</jbi:jbi>{code}

{note:title=Caution}{{{}Consumes}} sections cardinality is 1.{note}

h3. Router Pattern

*Enterprise Integration Pattern*
{center} !router.gif!{center}

{center}{*}Configuration of a Service Unit to provide a service (Router)*{center}

{table-plus}

| test\[\] | XPath condition(s) applied on the message to select the 'sub-service' | {center}\-{center} |
| test-operation\[\] | Operation condition(s) applied on the message to select the 'sub-service' | {center}\-{center} |
| fault-to-exception | If true, a fault received from a 'sub-service' service is transformed to an exception into the 'original' exchange. | {center}false{center} |
{table-plus}
\\
The EIP Component evaluates the list of conditions against the 'original' exchange.
Once a condition is matched, the message is forwarded to the 'sub-service' configured in the {{Consumes}} section at the same position than the condition.
The kind of condition can be either a XPath expression processed against the content of the 'original' {{IN}} message (parameter {{test}}), or a qualified operation processed against the 'original' exchange operation (parameter {{test-operation}}).
If none of the conditions are matched, the exchange is forwarded to the default 'sub-service', referenced in the last {{Consumes}} section.

An example of Service Unit configuration for the *Router* pattern :
{code:lang=xml}<?xml version="1.0"?>

<!-- JBI descriptor for the PEtALS component "EIP" -->
<jbi:jbi version="1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jbi="http://java.sun.com/xml/ns/jbi"
xmlns:petalsCDK="http://petals.ow2.org/components/extensions/version-5"
xmlns:eip="http://petals.ow2.org/components/eip/version-2"
xmlns:test="http://petals.ow2.org/test">

<jbi:services binding-component="false">

<jbi:provides
interface-name="test:router"
service-name="test:routerService1"
endpoint-name="routerService1Endpoint">
<petalsCDK:wsdl xsi:nil="true" />
<eip:eip>router</eip:eip>
<eip:test>
boolean(/*[local-name()='helloworld' and namespace-uri()='http://petals.ow2.org/test1'])
</eip:test>
<eip:test>
boolean(/*[local-name()='helloworld' and namespace-uri()='http://petals.ow2.org/test2'])
</eip:test>
<eip:fault-to-exception>false</eip:fault-to-exception>
</jbi:provides>

<jbi:consumes interface-name="test:routerProvider"
service-name="test:routerProviderService1"
endpoint-name="routerProviderService1Endpoint">
<petalsCDK:mep>InOut</petalsCDK:mep>
<petalsCDK:operation xmlns:petals="http://org.ow2.petals">petals:operation</petalsCDK:operation>
</jbi:consumes>

<jbi:consumes interface-name="test:routerProvider"
service-name="test:routerProviderService2"
endpoint-name="routerProviderService2Endpoint">
<petalsCDK:mep>InOut</petalsCDK:mep>
<petalsCDK:operation xmlns:petals="http://org.ow2.petals">petals:operation</petalsCDK:operation>
</jbi:consumes>

<!-- default -->
<jbi:consumes interface-name="test:routerProvider"
service-name="test:routerProviderService3"
endpoint-name="routerProviderService3Endpoint">
<petalsCDK:mep>InOut</petalsCDK:mep>
<petalsCDK:operation xmlns:petals="http://org.ow2.petals">petals:operation</petalsCDK:operation>
</jbi:consumes>
</jbi:services>
</jbi:jbi>{code}

{note:title=Caution}{{{}Consumes}} sections cardinality is the number of defined conditions plus 1.{note}
{note:title=Caution}The last {{Consumes}} section is the default service to invoke if no condition has been matched.{note}

h3. Dynamic Router Pattern

*Enterprise Integration Pattern*
{center} !dynamicrouter.gif!{center}

{center}{*}Configuration of a Service Unit to provide a service (Dynamic-Router)*{center}
{table-plus}

| test\[\] | XPath condition(s) applied on the message to select the 'sub-service' | {center}\-{center} |
| fault-to-exception | If true, a fault received from a 'sub-service' service is transformed to an exception into the 'original' exchange. | {center}false{center} |
{table-plus}
\\
This pattern is similar than the Router patternn but do not process the conditions evaluations on the 'original' exchange, but on a response of a conditioning 'sub-service'.
So, first at all, the {{IN}} message of the 'original' consumer is sent to the conditioning 'sub-service', which is the first {{Consumes}} section defined.
Then the component evaluates the list of conditions against the {{OUT}} response message.
The kind of condition is a XPath expression contained in parameter(s) {{test}}.
Once a condition is matched, the message is forwarded to the 'sub-service' configured in the {{Consumes}} section at the same position than the condition plus 1.
If none of the conditions are matched, the exchange is forwarded to the default 'sub-service', referenced in the last {{Consumes}} section.

An example of Service Unit configuration for the *dynamic-router* pattern :
{code:lang=xml}<?xml version="1.0"?>

<!-- JBI descriptor for the PEtALS component "EIP" -->
<jbi:jbi version="1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jbi="http://java.sun.com/xml/ns/jbi"
xmlns:petalsCDK="http://petals.ow2.org/components/extensions/version-5"
xmlns:eip="http://petals.ow2.org/components/eip/version-2"
xmlns:test="http://petals.ow2.org/test">

<jbi:services binding-component="false">
<jbi:provides
interface-name="test:dynamicRouter"
service-name="test:dynamicRouterService1"
endpoint-name="dynamicRouterService1Endpoint">
<petalsCDK:wsdl xsi:nil="true" />
<eip:eip>dynamic-router</eip:eip>
<eip:test>
boolean(/*[local-name()='helloworld' and namespace-uri()='http://petals.ow2.org/test2'])
</eip:test>
<eip:test>
boolean(/*[local-name()='helloworld' and namespace-uri()='http://petals.ow2.org/test3'])
</eip:test>
<eip:fault-to-exception>false</eip:fault-to-exception>
</jbi:provides>

<!-- router -->
<jbi:consumes interface-name="test:dynamicRouterProvider"
service-name="test:dynamicRouterProviderService1"
endpoint-name="dynamicRouterProviderService1Endpoint">
<petalsCDK:mep>InOut</petalsCDK:mep>
<petalsCDK:operation xmlns:petals="http://org.ow2.petals">petals:operation</petalsCDK:operation>
</jbi:consumes>

<jbi:consumes interface-name="test:dynamicRouterProvider"
service-name="test:dynamicRouterProviderService2"
endpoint-name="dynamicRouterProviderService2Endpoint">
<petalsCDK:mep>InOut</petalsCDK:mep>
<petalsCDK:operation xmlns:petals="http://org.ow2.petals">petals:operation</petalsCDK:operation>
</jbi:consumes>

<jbi:consumes interface-name="test:dynamicRouterProvider"
service-name="test:dynamicRouterProviderService3"
endpoint-name="dynamicRouterProviderService3Endpoint">
<petalsCDK:mep>InOut</petalsCDK:mep>
<petalsCDK:operation xmlns:petals="http://org.ow2.petals">petals:operation</petalsCDK:operation>
</jbi:consumes>

<!-- default -->
<jbi:consumes interface-name="test:dynamicRouterProvider"
service-name="test:dynamicRouterProviderService4"
endpoint-name="dynamicRouterProviderService4Endpoint">
<petalsCDK:mep>InOut</petalsCDK:mep>
<petalsCDK:operation xmlns:petals="http://org.ow2.petals">petals:operation</petalsCDK:operation>
</jbi:consumes>
</jbi:services>
</jbi:jbi>{code}

{note:title=Caution}{{{}Consumes}} sections cardinality is the number of conditions plus 2.{note}
{note:title=Caution}The first {{Consumes}} section is the 'sub-service' to invoke to get the message to evaluate. Its pattern is {{InOut}}.{note}
{note:title=Caution}The last {{consumes}} section is the default service to invoke if no condition has been matched.{note}

h3. Dispatcher Pattern

*Enterprise Integration Pattern*
{center} !dispatcher.gif!{center}

{center}{*}Configuration of a Service Unit to provide a service (Dispatcher)*{center}

{table-plus}

{table-plus}
\\
The EIP Component dispatches the incoming {{IN}} message toward the configured 'sub-services' in {{Consumes}} sections. No response message is expected.

An example of Service Unit configuration for the *Dispatcher* pattern :
{code:lang=xml}<?xml version="1.0"?>

<!-- JBI descriptor for the PEtALS component "EIP" -->
<jbi:jbi version="1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jbi="http://java.sun.com/xml/ns/jbi"
xmlns:petalsCDK="http://petals.ow2.org/components/extensions/version-5"
xmlns:eip="http://petals.ow2.org/components/eip/version-2"
xmlns:test="http://petals.ow2.org/test">

<jbi:services binding-component="false">
<jbi:provides
interface-name="test:dispatcher"
service-name="test:dispatcherService1"
endpoint-name="dispatcherService1Endpoint">
<petalsCDK:wsdl xsi:nil="true" />
<eip:eip>dispatcher</eip:eip>
</jbi:provides>

<jbi:consumes
interface-name="test:dispatcherProvider"
service-name="test:dispatcherProviderService1"
endpoint-name="dispatcherProviderService1Endpoint">
<petalsCDK:mep>InOnly</petalsCDK:mep>
<petalsCDK:operation xmlns:petals="http://org.ow2.petals">petals:operation</petalsCDK:operation>
</jbi:consumes>

<jbi:consumes
interface-name="test:dispatcherProvider"
service-name="test:dispatcherProviderService2"
endpoint-name="dispatcherProviderService2Endpoint">
<petalsCDK:mep>InOnly</petalsCDK:mep>
<petalsCDK:operation xmlns:petals="http://org.ow2.petals">petals:operation</petalsCDK:operation>
</jbi:consumes>
</jbi:services>
</jbi:jbi>
{code}
{note:title=Caution}{{{}Consumes}} sections cardinality is \[1-n\].{note}
{note:title=Caution}MEP of the 'original' exchange and the 'sub-services' must be {{InOnly}}.{note}

h1. Component Extension

The component can be extended by any contributor to provide the support of new EIP pattern.

To add a new pattern, provide a Java class implementing the interface {{Pattern}} :

{code}
/**
* The pattern interface
*
* @author Adrien Louis
* @author Christophe Hamerling
* @author Frederic Gardes
*/
public interface Pattern {

/**
* Initialize the pattern
*
*/
void init();

/**
* Process the Pattern.
*
* @param exchange
* The exchange to process
* @param context
* The context of the exchange
*/
boolean processPattern(Exchange exchange, ExchangeContext context);

/**
* Process an exchange for an asynchronous pattern.
*
* @param exchange
* The exchange to process
* @param context
* The context of the exchange
* @param asyncContext
* The EIP asynchronous context
* @param expired
* true if the asynchronous exchange is expired, false else
*/
boolean processAsyncPattern(Exchange exchange, ExchangeContext context,
EIPAsyncContext asyncContext, boolean expired);

/**
* Get the pattern name.
*
* @return The name
*/
String getName();
}
{code}
\\
Use the {{ExchangeContext}} to interact with the container, during your pattern processing :
{code}
/**
* The exchange context.
*
* @author Adrien Louis
* @author Frederic Gardes
*/
public interface ExchangeContext {

/**
* Get the logger
*
* @return the logger
*/
public Logger getLogger();

/**
* get the Consumes for an endpoint
*
* @param endpoint
* The endpoint
* @return The Consumes of the endpoint
*/
public List<Consumes> getSUConsumes(ServiceEndpoint endpoint);

/**
* Send synchronously an exchange. The response will be provided into the
* same exchange
*
* @param exchange
* The exchange to send
* @return true if the exchange was sent, false else (reached timeout,
* technical error,...)
* @throws MessagingException
*/
public boolean sendSync(final Exchange exchange) throws MessagingException;

/**
* Send asynchronously an exchange. The response will be provided as an
* asynchronous exchange
*
* @param exchange
* The exchange to send
* @param asyncContext
* The asynchronous context, provided on the response
* @throws MessagingException
*/
public void sendAsync(final Exchange exchange, AsyncContext asyncContext) throws MessagingException;

/**
* Send asynchronously an exchange. The response will be provided as a
* synchronous exchange
*
* @param exchange
* The exchange to send
* @throws MessagingException
*/
public void send(final Exchange exchange) throws MessagingException;

/**
* Create an exchange from a Consumes
*
* @param consumes
* The Consumes used as JBI Consumer of the exchange
* @return The exchange created
* @throws MessagingException
* @throws PEtALSCDKException
*/
public Exchange createConsumeExchange(Consumes consumes) throws MessagingException, PEtALSCDKException;

/**
* Get the extensions
*
* @return The extensions
*/
public ConfigurationExtensions getExtensions();
}
{code}
\\
Extends the JBI.xml file of the component to reference your new pattern.

h1. Component Configuration

{code:xml}
<?xml version="1.0" encoding="UTF-8"?>
<jbi version="1.0"
xmlns="http://java.sun.com/xml/ns/jbi"
xmlns:petalsCDK="http://petals.ow2.org/components/extensions/version-5"
xmlns:eip="http://petals.ow2.org/components/eip/version-2">
<component type="service-engine" component-class-loader-delegation="parent-first">
<identification>
<name>petals-se-eip</name>
<description>EIP Service engine</description>
</identification>
<component-class-name>org.ow2.petals.se.eip.EIPComponent</component-class-name>
<component-class-path>
<path-element />
</component-class-path>
<bootstrap-class-name>org.ow2.petals.component.framework.DefaultBootstrap</bootstrap-class-name>
<bootstrap-class-path>
<path-element></path-element>
</bootstrap-class-path>
<petalsCDK:acceptor-pool-size>5</petalsCDK:acceptor-pool-size>
<petalsCDK:processor-pool-size>10</petalsCDK:processor-pool-size>
<petalsCDK:ignored-status>NOTHING_IGNORED</petalsCDK:ignored-status>
<petalsCDK:notifications>false</petalsCDK:notifications>
<petalsCDK:jbi-listener-class-name>
org.ow2.petals.se.eip.listener.JBIListener
</petalsCDK:jbilistener-class-name>
<petalsCDK:properties-file />

<!-- Declaring the supported patterns -->
<eip:aggregator>org.ow2.petals.se.eip.patterns.Aggregator</eip:aggregator>
<eip:router>org.ow2.petals.se.eip.patterns.Router</eip:router>
<eip:dynamic-router>org.ow2.petals.se.eip.patterns.DynamicRouter</eip:dynamic-router>
<eip:dispatcher>org.ow2.petals.se.eip.patterns.Dispatcher</eip:dispatcher>
<eip:routing-slip>org.ow2.petals.se.eip.patterns.RoutingSlip</eip:routing-slip>
<eip:bridge>org.ow2.petals.se.eip.patterns.Bridge</eip:bridge>
<eip:wire-tap>org.ow2.petals.se.eip.patterns.WireTap</eip:wire-tap>
<eip:scatter-gather>org.ow2.petals.se.eip.patterns.ScatterGather</eip:scatter-gather>
<eip:splitter>org.ow2.petals.se.eip.patterns.Splitter</eip:splitter>
</component>
</jbi>
{code}

{include:0 CDK Component Configuration Table 2.1}
{include:0 CDK Parameter scope}
\\
{center}{*}Configuration of the component (EIP)*{center}

{table-plus}

{include:0 CDK Component Interceptor configuration}
{column}
{column:width=350px}
{panel:title=Table of contents}{toc}{panel}
{panel:title=Contributors}{contributors:order=name|mode=list}{panel}
{column}
{section}