As EasyBPEL is based on EasyVIPER, an extended behavior is expected to be developed for each extended activity in EasyBPEL.
First we consider an extended behavior is available (see the specific how-to on EasyVIPER page (TODO link to easyviper how to)).
The following figure shows this principle of EasyBPEL activity mapped into an EasyVIPER behaviour. For the *Invoke* activity defined in the BPEL specification, a corresponding *Send* behavior has been implemented in EasyVIPER. In a same way, any extended activity defined at EasyBPEL level corresponds to an extended behavior at EasyVIPER level.
!extended_activity.gif|border=1,width=600!
An extended activity implementation must be composed of a JAVA interface extending the {{ExtendedActivity}} interface:
{code:title=MyExtendedActivity.java|borderStyle=solid}
import com.ebmwebsourcing.easybpel.model.bpel.api.activity.extension.ExtendedActivity;
public interface MyExtendedActivity extends ExtendedActivity {
//Some specific stuff related to MyExtendedActivity
}
{code}
A JAVA class must implement this {{MyExtendedActivity}} interface:
{code:title=MyExtendedActivityImpl.java|borderStyle=solid}
...
import mypackage.MyExtendedActivity;
...
@org.oasisopen.sca.annotation.Scope("COMPOSITE")
@org.oasisopen.sca.annotation.Service(value=MyExtendedActivity.class,names="service")
@PolicySets("frascati:scaEasyPrimitive")
public class MyExtendedActivityImpl extends DebugPackageExtendedActivityImpl<TMyExtendedActivity> implements MyExtendedActivity {
public MyExtendedActivityImpl(QName tag, Element elmt, ExtensionActivity parent)
throws BPELException {
super(tag, elmt, parent);
//Some specific stuff related to MyExtendedActivityImpl
}
@Override
public void validate(BPELStaticAnalysis analyzer) {
//Some specific stuff related to MyExtendedActivityImpl
}
@Override
public Node generate(Scope scope) throws CoreException {
//Some specific stuff related to MyExtendedActivityImpl
}
@Override
protected TMyExtendedActivity convertElementToModel(Element elmt)
throws BPELException {
TMyExtendedActivity res = null;
try {
JAXBElement<TMyExtendedActivity> jaxb = this.getJaxbContext().createUnmarshaller().unmarshal(elmt, TMyExtendedActivity.class);
res = jaxb.getValue();
} catch (JAXBException e) {
throw new BPELException(e);
} catch(SchemaException e){
throw new BPELException(e);
}
return res;
}
}
{code}
You have to fill the constructor (at least with a {{super()}} method), the {{convertElementToModel()}}, {{validate()}} and {{generate()}} methods.
The {{validate}} method SHOULD be filled whereas the {{generate}} method MUST be filled. It consists basically in instantiating the extended behavior developed at EasyVIPER level. Here is an example of {{generate}} method:
{code:title=MyExtendedActivityImpl.java excerpt|borderStyle=solid}
@Override
public Node generate(Scope scope) throws CoreException {
MyExtendedBehavior myExtendedBehavior = new MyExtendedBehaviorImpl();
// myExtendedBehavior.foo()
Node behaviourNode = scope.createNode(this.model.getName(), myExtendedBehavior);
return behaviourNode;
}
{code}
...