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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.sca.assembly.xml;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import org.apache.tuscany.sca.assembly.Binding;
import org.apache.tuscany.sca.assembly.Callback;
import org.apache.tuscany.sca.assembly.Component;
import org.apache.tuscany.sca.assembly.ComponentService;
import org.apache.tuscany.sca.assembly.Composite;
import org.apache.tuscany.sca.assembly.Endpoint;
import org.apache.tuscany.sca.assembly.EndpointReference;
import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
import org.apache.tuscany.sca.contribution.processor.ContributionResolveException;
import org.apache.tuscany.sca.contribution.processor.ContributionWriteException;
import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
import org.apache.tuscany.sca.contribution.processor.StAXAttributeProcessor;
import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
import org.apache.tuscany.sca.core.ExtensionPointRegistry;
import org.apache.tuscany.sca.core.FactoryExtensionPoint;
import org.apache.tuscany.sca.policy.PolicySet;
/**
*
*/
public class EndpointProcessor extends BaseAssemblyProcessor implements StAXArtifactProcessor<Endpoint> {
private final static String ENDPOINT = "endpoint";
private final static QName ENDPOINT_QNAME = new QName(Constants.SCA11_TUSCANY_NS, ENDPOINT);
private final static String CALLBACK_ENDPOINT = "callbackEndpoint";
private final static QName CALLBACK_ENDPOINT_QNAME = new QName(Constants.SCA11_TUSCANY_NS, CALLBACK_ENDPOINT);
private ExtensionPointRegistry registry;
public EndpointProcessor(ExtensionPointRegistry registry,
StAXArtifactProcessor extensionProcessor,
StAXAttributeProcessor extensionAttributeProcessor) {
super(modelFactories(registry), extensionProcessor);
this.registry = registry;
}
/**
* Returns the model factory extension point to use.
*
* @param extensionPoints
* @return
*/
private static FactoryExtensionPoint modelFactories(ExtensionPointRegistry extensionPoints) {
return extensionPoints.getExtensionPoint(FactoryExtensionPoint.class);
}
public QName getArtifactType() {
return ENDPOINT_QNAME;
}
public Endpoint read(XMLStreamReader reader, ProcessorContext context) throws ContributionReadException, XMLStreamException {
Endpoint endpoint = assemblyFactory.createEndpoint();
if (reader.getEventType() == XMLStreamConstants.START_DOCUMENT) {
reader.nextTag();
}
if (reader.getEventType() == XMLStreamConstants.START_ELEMENT && ENDPOINT_QNAME.equals(reader.getName())) {
// Skip the "endpoint" element wrapper
reader.nextTag();
}
Object model = extensionProcessor.read(reader, context);
if (model instanceof Composite) {
Composite composite = (Composite)model;
Component component = composite.getComponents().get(0);
ComponentService service = component.getServices().get(0);
Binding binding = service.getBindings().isEmpty() ? null : service.getBindings().get(0);
endpoint.setComponent(component);
endpoint.setService(service);
endpoint.setBinding(binding);
// We use the name of the composite to indicate if this is a callback endpoint
// saves passing other extension attributes
if (composite.getName().equals(CALLBACK_ENDPOINT_QNAME)){
service.setForCallback(true);
}
// retrieve the stash of intents and policy sets from the component
endpoint.getRequiredIntents().addAll(component.getRequiredIntents());
endpoint.getPolicySets().addAll(component.getPolicySets());
}
return endpoint;
}
public void write(Endpoint model, XMLStreamWriter writer, ProcessorContext context) throws ContributionWriteException, XMLStreamException {
// writeStart(writer, ENDPOINT_QNAME);
extensionProcessor.write(wrap(model), writer, context);
// writeEnd(writer);
}
private Composite wrap(Endpoint endpoint) {
try {
Composite composite = assemblyFactory.createComposite();
// We use the name of the composite (which just wraps the single endpoint
// to indicate whether this endpoint represents a callback or not
if (endpoint.getService() != null &&
endpoint.getService().isForCallback()){
composite.setName(CALLBACK_ENDPOINT_QNAME);
} else {
composite.setName(ENDPOINT_QNAME);
}
composite.setLocal(false);
if (endpoint.getComponent() != null) {
Component component = (Component)endpoint.getComponent().clone();
component.setImplementation(null);
composite.getComponents().add(component);
component.getReferences().clear();
component.getServices().clear();
// stash endpoint intents and policy sets on the component so that they are all
// in one place
component.getRequiredIntents().clear();
component.getRequiredIntents().addAll(endpoint.getRequiredIntents());
component.getPolicySets().clear();
component.getPolicySets().addAll(endpoint.getPolicySets());
if (endpoint.getService() != null) {
ComponentService service = (ComponentService)endpoint.getService().clone();
component.getServices().add(service);
service.getBindings().clear();
service.setInterfaceContract(endpoint.getComponentServiceInterfaceContract());
if (endpoint.getBinding() != null) {
Binding binding = (Binding)endpoint.getBinding().clone();
service.getBindings().add(binding);
}
// put both manually configured AND automatically generated callback bindings
// into the wrapping model so that we can pass callback configuarion via
// the registry
if (service.getCallbackReference() != null) {
Callback callback = service.getCallback();
if(callback == null){
callback = assemblyFactory.createCallback();
}
for (EndpointReference epr : service.getCallbackReference().getEndpointReferences()){
callback.getBindings().add(epr.getBinding());
}
service.setCallback(callback);
}
}
}
return composite;
} catch (CloneNotSupportedException e) {
return null;
}
}
public Class<Endpoint> getModelType() {
return Endpoint.class;
}
public void resolve(Endpoint model, ModelResolver resolver, ProcessorContext context) throws ContributionResolveException {
// the only thing we'll resolve here is the policy model as the endpoint
// matching algorithm needs to look inside the policy model
for (PolicySet policySet : model.getPolicySets()){
extensionProcessor.resolve(policySet, resolver, context);
}
}
}
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