{section}
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h1. Features

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This Service Engine allows to expose an annotated POJO as a JBI Service in the bus.

This component is based on the Petals ESB Component Development Kit and on Apache Axis2 for invocation and marshalling.

If you want more details about jsr181, you can consult this the specification on the Java Community Process portal : [http://jcp.org/en/jsr/detail?id=181|http://jcp.org/en/jsr/detail?id=181]
{column}
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{panel}{toc}{panel}
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{section}

h1. Component Configuration

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The component can be configured through its JBI descriptor file like this :
\\
{code:lang=xml}
<?xml version="1.0" encoding="UTF-8"?>
<jbi:jbi version="1.0" xmlns:jbi="http://java.sun.com/xml/ns/jbi"
xmlns:petalsCDK="http://petals.ow2.org/components/extensions/version-4.0"
xmlns:jsr181="http://petals.ow2.org/components/jsr181/version-1.0>

<jbi:component type="service-engine" bootstrap-class-loader-delegation="parent-first">
<jbi:identification>
<jbi:name>petals-se-jsr181</jbi:name>
<jbi:description> The jsr181 Service Engine (based on Axis2)</jbi:description>
</jbi:identification>
<jbi:component-class-name>org.ow2.petals.se.jsr181.Component</jbi:component-class-name>
<jbi:component-class-path>...</jbi:component-class-path>
<jbi:bootstrap-class-name>org.ow2.petals.se.jsr181.Bootstrap</jbi:bootstrap-class-name>
<jbi:bootstrap-class-path>...</jbi:bootstrap-class-path>

<!-- Component Development Kit Parameters -->
<petalsCDK:acceptor-pool-size>5</petalsCDK:acceptor-pool-size>
<petalsCDK:processor-pool-size>10</petalsCDK:processor-pool-size>
<petalsCDK:ignored-status>DONE_AND_ERROR_IGNORED</petalsCDK:ignored-status>
<petalsCDK:properties-file />
<petalsCDK:performance-notifications>false</petalsCDK:performance-notifications>
</jbi:component>
</jbi:jbi>{code}
\\
{note:title=Note}Actually, nothing is configurable in this JBI descriptor, so leave it as it is.{note}
{note:title=Node}The class name values in italic should not be modified by the user.
{note}

{include:0 CDK Component Configuration Table}
\\
{include:0 CDK Interceptor configuration for SU}


h1. Service Configuration

PROVIDE SERVICE : Expose an Java Class as Service in the JBI environment.

The petals-se-jsr181 component can expose a Java Class as JBI ServiceEndpoint. This is done by deploying a Service Unit on it.

When a message is received on a JSR181 linked endpoint from the JBI environment, it is mapped to an Axis2 message and sent to the Axis2 runtime. The linked Java Class is called and the response is processed and returned to the JBI environment.



h3. Service Unit descriptor

The Service Unit descriptor file ( jbi.xml ) looks like this :
\\
{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-4.0"
xmlns:helloworld="http://petals.ow2.org/helloworld"
xmlns:jsr181="http://petals.ow2.org/components/jsr181/version-1.0">

<jbi:services binding-component="false">
<jbi:provides
interface-name="helloworld:Helloworld"
service-name="helloworld:HelloworldService"
endpoint-name="HelloworldEndpoint">
<petalsCDK:wsdl>Service.wsdl</petalsCDK:wsdl>
<jsr181:class>org.ow2.petals.usecase.jsr181.TestService</jsr181:class>
</jbi:provides>
</jbi:services>
</jbi:jbi>
{code}

{include:0 CDK Parameter scope}

{include:0 CDK SU Provide Configuration}
\\
*Configuration of a Service Unit to provide a service (JSR181)*
{table-plus}
|| Parameter\\ || Description\\ || Default\\ || Required\\ ||
| class\\ | The JSR181 annotated class which will provide the Service.This class must be available in the Service Unit class loader. | \-\\ | Yes\\ |
{table-plus}

h3. Annotated class

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The following class is a sample of JSR181 annotated class (taken from the Petals usecase sources) :
{code}package org.ow2.petals.usecase.jsr181;

import java.text.SimpleDateFormat;
import java.util.Date;
import javax.jws.WebMethod;
import javax.jws.WebService;

/**
*
* @author chamerling - eBM WebSourcing
*
*
* NOTE : The
* @WebService parameters are not used by the component, the service name is
* defined in the service unit. Need to modify the CDK to be able to
* create the endpoint from these values...
*/
@WebService(serviceName = "Hello", name = "MyService", targetNamespace = "http://petals.ow2.org")
public class TestService {

/**
* Say hello to the world !
*/
@WebMethod
public String sayHello(String str) {
System.out.println("Hey! This is the sayHello operation.");
return "You say me " + str;
}

/**
* Get a person from its id only to test 'complex' data binding.
*
* @param id
* @return
*/
@WebMethod
public Person getPerson(int id) {
System.out.println("Get person " + id);
return new Person(id, "Christophe", "Hamerling", 29, "France");
}

/**
*
* @return
*/
@WebMethod
public String getTime() {
System.out.println("Get time");
return new SimpleDateFormat().format(new Date(System.currentTimeMillis()));
}

/**
* NOP
*/
@WebMethod
public void voidvoid() {
System.out.println("The Void operation");
}

/**
* The final operation will be 'specializedOperation'
*/
@WebMethod(operationName = "specializedOperation")
public void operation() {
System.out.println("The specialized operation");
}

/**
*
* @throws Exception
*/
@WebMethod
public String iAmThrowingAnException() throws Exception {
System.out.println("throw exception");
throw new Exception("This is a server side Exception");
}
}{code}

The main annotations you may use are :
* The *@WebService* annotation is mandatory and is used by the Axis2 engine to build the service. You can specialize the service name, target namespace and more with the annotation parameter.
* The *@WebMethod* annotation is used to delare the that the method will be see as a JBI operation. You can specialize the operation name and more with the annotation parameters.

More information is available on the Apache Axis2 page : [http://ws.apache.org/axis2/|http://ws.apache.org/axis2/] .

Before sending the JBI message to the Axis2 service, the JBI Service Engine will check if :
* If the requested operation exists. If not, an error will be returned in the JBI message exchange.

</sayHello>
{code}
and you will get a response like :
{code:lang=xml}<dlwmin:sayHelloResponse
xmlns:dlwmin="http://petals.ow2.org"
xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
<return>You say me Hey!!!</return>
</dlwmin:sayHelloResponse>
{code}