{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}

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'.

An example of Service Unit configuration to provide the *Wire-Tap* 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:wireTap"
service-name="test:wireTapService1"
endpoint-name="wireTapService1Endpoint">
<petalsCDK:wsdl xsi:nil="true" />
<eip:eip>wire-tap</eip:eip>
<eip:wiretap-way>request</eip:wiretap-way>
</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>InOut</petalsCDK:mep>
</jbi:consumes>

<!-- monitoring -->
<jbi:consumes interface-name="test:aggregateProvider"
service-name="test:aggregateProviderService2"
endpoint-name="aggregateProviderService2Endpoint">
<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 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} |

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*

| 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 content into the final target exchange
</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>

*Enterprise Integration Pattern*

\\
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>

h3. Dynamic Router Pattern

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

| test | XPath condition applied on the message to choose the target service | {center}\-{center} |
| fault-to-exception | if true, a fault received from the target service is transformed into an exception and set to the 'original' exchange | false |
{table-plus}
\\
The EIP Component evaluates expressions on OUT or fault message from a router exchange. The IN message from the source exchange is sent to the first consumes defined. Conditions are valuated against the response of this router service until a {{true}} result. Then, the exchange is forwarded to the service referenced in the {{consumes}} section matching the position of the condition, swtiching of the first consumes (used to define the routzer service). If none of the conditions are true, the exchange is forwarded to the service referenced in the last {{consumes}} section (default).

An example of service unit configuration :
{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 service to invoke to get the message to evaluate. So its pattern is {{InOut{}}}{note}
{note:title=Caution}the last {{consumes}} section is the default service to invoke if no condition has been fullfilled.{note}

h3. Dispatcher Pattern

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

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

| fault-to-exception | if true, a fault received from the target service is transformed to an exception into the source exchange. | {center}false{center} |
{table-plus}
\\
The EIP Component dispatches the incoming IN message toward the configured service in consumes sections. No response message is returned.

An example of service unit configuration :
{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>
<eip:fault-to-exception>false</eip:fault-to-exception>
</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|1-n].{note}
{note:title=Caution}message exchange pattern of the incoming exchange and the consumed services is {{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}
\\
{center}{*}Configuration of the component (EIP)*{center}
{table-plus}

{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}