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/**
* SCA4J
* Copyright (c) 2009 - 2099 Service Symphony Ltd
*
* Licensed to you under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License. A copy of the license
* is included in this distrubtion or you may obtain a copy at
*
* http://www.opensource.org/licenses/apache2.0.php
*
* 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.
*
* This project contains code licensed from the Apache Software Foundation under
* the Apache License, Version 2.0 and original code from project contributors.
*
*
* Original Codehaus Header
*
* Copyright (c) 2007 - 2008 fabric3 project contributors
*
* Licensed to you under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License. A copy of the license
* is included in this distrubtion or you may obtain a copy at
*
* http://www.opensource.org/licenses/apache2.0.php
*
* 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.
*
* This project contains code licensed from the Apache Software Foundation under
* the Apache License, Version 2.0 and original code from project contributors.
*
* Original Apache Header
*
* Copyright (c) 2005 - 2006 The Apache Software Foundation
*
* Apache Tuscany is an effort undergoing incubation at The Apache Software
* Foundation (ASF), sponsored by the Apache Web Services PMC. Incubation is
* required of all newly accepted projects until a further review indicates that
* the infrastructure, communications, and decision making process have stabilized
* in a manner consistent with other successful ASF projects. While incubation
* status is not necessarily a reflection of the completeness or stability of the
* code, it does indicate that the project has yet to be fully endorsed by the ASF.
*
* This product includes software developed by
* The Apache Software Foundation (http://www.apache.org/).
*/
package org.sca4j.fabric.policy.helper;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import javax.xml.namespace.QName;
import org.osoa.sca.annotations.Reference;
import org.sca4j.fabric.policy.infoset.PolicySetEvaluator;
import org.sca4j.scdl.Implementation;
import org.sca4j.scdl.Operation;
import org.sca4j.scdl.definitions.ImplementationType;
import org.sca4j.scdl.definitions.Intent;
import org.sca4j.scdl.definitions.PolicySet;
import org.sca4j.spi.model.instance.LogicalComponent;
import org.sca4j.spi.policy.PolicyResolutionException;
import org.sca4j.spi.services.definitions.DefinitionsRegistry;
import org.w3c.dom.Element;
/**
* @version $Revision$ $Date$
*/
public class ImplementationPolicyHelperImpl extends AbstractPolicyHelper implements ImplementationPolicyHelper {
public ImplementationPolicyHelperImpl(@Reference DefinitionsRegistry definitionsRegistry,
@Reference PolicySetEvaluator policySetEvaluator) {
super(definitionsRegistry, policySetEvaluator);
}
public List getProvidedIntents(LogicalComponent logicalComponent, Operation operation) throws PolicyResolutionException {
Implementation implementation = logicalComponent.getDefinition().getImplementation();
QName type = implementation.getType();
ImplementationType implementationType = definitionsRegistry.getDefinition(type, ImplementationType.class);
// FIXME This should not happen, all implementation types should be registsred
if(implementationType == null) {
return Collections.emptyList();
}
List mayProvidedIntents = implementationType.getMayProvide();
List requiredIntents = getRequestedIntents(logicalComponent, operation);
List intentsToBeProvided = new LinkedList();
for(Intent intent : requiredIntents) {
if(mayProvidedIntents.contains(intent.getName())) {
intentsToBeProvided.add(intent);
}
}
return intentsToBeProvided;
}
public List resolveIntents(LogicalComponent logicalComponent, Operation operation, Element target) throws PolicyResolutionException {
Implementation implementation = logicalComponent.getDefinition().getImplementation();
QName type = implementation.getType();
ImplementationType implementationType = definitionsRegistry.getDefinition(type, ImplementationType.class);
List alwaysProvidedIntents = new ArrayList();
List mayProvidedIntents = new ArrayList();
// FIXME This should not happen, all implementation types should be registsred
if(implementationType != null) {
alwaysProvidedIntents = implementationType.getAlwaysProvide();
mayProvidedIntents = implementationType.getMayProvide();
}
List requiredIntents = getRequestedIntents(logicalComponent, operation);
List requiredIntentsCopy = new LinkedList(requiredIntents);
List requestedPolicies = getRequestedPolicies(logicalComponent, operation);
// Remove intents that are provided
for(Intent intent : requiredIntentsCopy) {
QName intentName = intent.getName();
if(alwaysProvidedIntents.contains(intentName) || mayProvidedIntents.contains(intentName)) {
requiredIntents.remove(intent);
}
}
List policies = resolvePolicies(requiredIntents, requestedPolicies, target, operation.getName());
if(requiredIntents.size() > 0) {
throw new PolicyResolutionException("Unable to resolve all intents", requiredIntents);
}
return policies;
}
private List getRequestedIntents(LogicalComponent logicalComponent, Operation operation) throws PolicyResolutionException {
// Aggregate all the intents from the ancestors
List intentNames = new LinkedList();
intentNames.addAll(operation.getIntents());
intentNames.addAll(logicalComponent.getDefinition().getImplementation().getIntents());
intentNames.addAll(aggregateIntents(logicalComponent));
// Expand all the profile intents
List requiredIntents = resolveProfileIntents(intentNames);
// Remove intents not applicable to the artifact
filterInvalidIntents(Intent.IMPLEMENTATION, requiredIntents);
return requiredIntents;
}
private List getRequestedPolicies(LogicalComponent logicalComponent, Operation operation) throws PolicyResolutionException {
// Aggregate all the intents from the ancestors
List policies = new LinkedList();
policies.addAll(operation.getPolicySets());
policies.addAll(logicalComponent.getDefinition().getImplementation().getPolicySets());
policies.addAll(aggregatePolicies(logicalComponent));
return policies;
}
}
