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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/).
*/
/*
* 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.sca4j.fabric.policy;
import java.util.Collections;
import java.util.List;
import javax.xml.namespace.QName;
import org.osoa.sca.annotations.Reference;
import org.sca4j.fabric.policy.helper.ImplementationPolicyHelper;
import org.sca4j.fabric.policy.helper.InteractionPolicyHelper;
import org.sca4j.fabric.policy.infoset.PolicyInfosetBuilder;
import org.sca4j.host.Namespaces;
import org.sca4j.scdl.Operation;
import org.sca4j.scdl.ServiceContract;
import org.sca4j.scdl.definitions.Intent;
import org.sca4j.scdl.definitions.PolicyPhase;
import org.sca4j.scdl.definitions.PolicySet;
import org.sca4j.spi.model.instance.LogicalBinding;
import org.sca4j.spi.model.instance.LogicalComponent;
import org.sca4j.spi.policy.Policy;
import org.sca4j.spi.policy.PolicyResolutionException;
import org.sca4j.spi.policy.PolicyResolver;
import org.sca4j.spi.policy.PolicyResult;
import org.sca4j.util.closure.Closure;
import org.sca4j.util.closure.CollectionUtils;
import org.w3c.dom.Element;
/**
* @version $Revision$ $Date$
*/
public class DefaultPolicyResolver implements PolicyResolver {
private static final QName IMPLEMENTATION_SYSTEM = new QName(Namespaces.SCA4J_NS, "implementation.system");
private static final QName IMPLEMENTATION_SINGLETON = new QName(Namespaces.SCA4J_NS, "singleton");
/**
* Closure for filtering intercepted policies.
*/
private static final Closure INTERCEPTION = new Closure() {
public Boolean execute(PolicySet policySet) {
return policySet.getPhase() == PolicyPhase.INTERCEPTION;
}
};
/**
* Closure for filtering provided policies by bindings or implementations.
*/
private static final Closure PROVIDED = new Closure() {
public Boolean execute(PolicySet policySet) {
return policySet.getPhase() == PolicyPhase.PROVIDED;
}
};
private static final PolicyResult RESULT = new PolicyResult() {
public List getInterceptedPolicySets(Operation operation) {
return Collections.emptyList();
}
public Policy getSourcePolicy() {
return new Policy() {
public List getProvidedIntents(Operation operation) {
return Collections.emptyList();
}
public List getProvidedPolicySets(Operation operation) {
return Collections.emptyList();
}
};
}
public Policy getTargetPolicy() {
return new Policy() {
public List getProvidedIntents(Operation operation) {
return Collections.emptyList();
}
public List getProvidedPolicySets(Operation operation) {
return Collections.emptyList();
}
};
}
};
private final InteractionPolicyHelper interactionPolicyHelper;
private final ImplementationPolicyHelper implementationPolicyHelper;
private final PolicyInfosetBuilder policyInfosetBuilder;
public DefaultPolicyResolver(@Reference InteractionPolicyHelper interactionPolicyHelper,
@Reference ImplementationPolicyHelper implementationPolicyHelper,
@Reference PolicyInfosetBuilder policyInfosetBuilder) {
this.interactionPolicyHelper = interactionPolicyHelper;
this.implementationPolicyHelper = implementationPolicyHelper;
this.policyInfosetBuilder = policyInfosetBuilder;
}
/**
* Resolves all the interaction and implementation intents for the wire.
*
* @param serviceContract Service contract for the wire.
* @param sourceBinding Source binding.
* @param targetBinding Target binding.
* @param source Source component.
* @param target Target component.
* @return Policy resolution result.
* @throws PolicyResolutionException If unable to resolve any policies.
*/
public PolicyResult resolvePolicies(ServiceContract serviceContract,
LogicalBinding sourceBinding,
LogicalBinding targetBinding,
LogicalComponent source,
LogicalComponent target) throws PolicyResolutionException {
if (noPolicy(source) && noPolicy(target)) {
return RESULT;
}
PolicyResultImpl policyResult = new PolicyResultImpl();
for (Operation operation : serviceContract.getOperations()) {
policyResult.addSourceIntents(operation, interactionPolicyHelper.getProvidedIntents(sourceBinding, operation));
// Don't do policy resolution on souce components for implementation intents
// if (source != null) {
// policyResult.addSourceIntents(operation, implementationPolicyHelper.getProvidedIntents(source, operation));
//}
policyResult.addTargetIntents(operation, interactionPolicyHelper.getProvidedIntents(targetBinding, operation));
if (target != null) {
policyResult.addSourceIntents(operation, implementationPolicyHelper.getProvidedIntents(target, operation));
}
List policies;
Element policyInfoset;
// Don't do policy resolution on souce components for implementation intents
//if (source != null) {
// policyInfoset = policyInfosetBuilder.buildInfoSet(source);
// policies = implementationPolicyHelper.resolveIntents(source, operation, policyInfoset);
// policyResult.addSourcePolicySets(operation, CollectionUtils.filter(policies, PROVIDED));
// policyResult.addInterceptedPolicySets(operation, CollectionUtils.filter(policies, INTERCEPTION));
//}
policyInfoset = policyInfosetBuilder.buildInfoSet(sourceBinding);
policies = interactionPolicyHelper.resolveIntents(sourceBinding, operation, policyInfoset);
policyResult.addSourcePolicySets(operation, CollectionUtils.filter(policies, PROVIDED));
policyResult.addInterceptedPolicySets(operation, CollectionUtils.filter(policies, INTERCEPTION));
policyInfoset = policyInfosetBuilder.buildInfoSet(targetBinding);
policies = interactionPolicyHelper.resolveIntents(targetBinding, operation, policyInfoset);
policyResult.addTargetPolicySets(operation, CollectionUtils.filter(policies, PROVIDED));
policyResult.addInterceptedPolicySets(operation, CollectionUtils.filter(policies, INTERCEPTION));
if (target != null) {
policyInfoset = policyInfosetBuilder.buildInfoSet(target);
policies = implementationPolicyHelper.resolveIntents(target, operation, policyInfoset);
policyResult.addTargetPolicySets(operation, CollectionUtils.filter(policies, PROVIDED));
policyResult.addInterceptedPolicySets(operation, CollectionUtils.filter(policies, INTERCEPTION));
}
}
return policyResult;
}
private boolean noPolicy(LogicalComponent component) {
return component != null && (component.getDefinition().getImplementation().isType(IMPLEMENTATION_SYSTEM)
|| component.getDefinition().getImplementation().isType(IMPLEMENTATION_SINGLETON));
}
}
