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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.builder.impl;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.List;
import javax.xml.namespace.QName;
import org.apache.tuscany.sca.assembly.Binding;
import org.apache.tuscany.sca.assembly.ConfiguredOperation;
import org.apache.tuscany.sca.assembly.Contract;
import org.apache.tuscany.sca.assembly.OperationsConfigurator;
import org.apache.tuscany.sca.assembly.Service;
import org.apache.tuscany.sca.policy.Intent;
import org.apache.tuscany.sca.policy.IntentAttachPoint;
import org.apache.tuscany.sca.policy.IntentAttachPointType;
import org.apache.tuscany.sca.policy.PolicySet;
import org.apache.tuscany.sca.policy.PolicySetAttachPoint;
import org.apache.tuscany.sca.policy.util.PolicyComputationUtils;
import org.apache.tuscany.sca.policy.util.PolicyValidationException;
/**
* Policy computation methods pertaining to computing Binding policies
*/
public class BindingPolicyComputer extends PolicyComputer {
public BindingPolicyComputer() {
super();
}
public void computeBindingIntentsAndPolicySets(Contract contract) throws PolicyValidationException {
for (Binding binding : contract.getBindings()) {
if (binding instanceof PolicySetAttachPoint) {
computeIntents((IntentAttachPoint)binding, contract.getRequiredIntents());
aggregateAndPruneApplicablePolicySets(contract.getApplicablePolicySets(),
((PolicySetAttachPoint)binding).getApplicablePolicySets());
computePolicySets((PolicySetAttachPoint)binding, contract.getPolicySets());
if ( binding instanceof OperationsConfigurator &&
contract instanceof OperationsConfigurator ) {
//add or merge service operations to the binding
addInheritedOpConfOnBindings((OperationsConfigurator)contract,
(OperationsConfigurator)binding,
(PolicySetAttachPoint)binding);
computeIntentsForOperations((IntentAttachPoint)binding);
computePolicySetsForOperations(contract.getApplicablePolicySets(),
(PolicySetAttachPoint)binding);
}
}
}
if ( contract.getCallback() != null ) {
for (Binding binding : contract.getCallback().getBindings()) {
if (binding instanceof PolicySetAttachPoint) {
computeIntents((IntentAttachPoint)binding, contract.getCallback().getRequiredIntents());
aggregateAndPruneApplicablePolicySets(contract.getApplicablePolicySets(),
((PolicySetAttachPoint)binding).getApplicablePolicySets());
computePolicySets((PolicySetAttachPoint)binding, contract.getCallback().getPolicySets());
}
}
}
}
private void computeIntents(IntentAttachPoint policiedBinding, List<Intent> inheritedIntents)
throws PolicyValidationException {
//since the parent component could also contain intents that apply to implementation
//and binding elements within, we filter out only those that apply to this binding type
List<Intent> prunedIntents = computeInheritableIntents(policiedBinding.getType(),
inheritedIntents);
policiedBinding.getRequiredIntents().addAll(prunedIntents);
normalizeIntents(policiedBinding);
}
private void computePolicySets(PolicySetAttachPoint policiedBinding,
List<PolicySet> inheritedPolicySets) throws PolicyValidationException {
List<PolicySet> prunedPolicySets = computeInheritablePolicySets(inheritedPolicySets,
policiedBinding.getApplicablePolicySets());
policiedBinding.getPolicySets().addAll(prunedPolicySets);
normalizePolicySets(policiedBinding);
}
public void determineApplicableBindingPolicySets(Contract source, Contract target) throws PolicyComputationException {
List<Intent> intentsCopy = null;
for (Binding aBinding : source.getBindings()) {
if (aBinding instanceof PolicySetAttachPoint) {
PolicySetAttachPoint policiedBinding = (PolicySetAttachPoint)aBinding;
IntentAttachPointType bindingType = policiedBinding.getType();
intentsCopy = new ArrayList<Intent>(policiedBinding.getRequiredIntents());
// add the target component's intents to the reference binding
if (target != null) {
for (Intent intent : target.getRequiredIntents()) {
if (!policiedBinding.getRequiredIntents().contains(intent)) {
for (QName constrained : intent.getConstrains()) {
if (bindingType != null && bindingType.getName().getNamespaceURI()
.equals(constrained.getNamespaceURI())
&& bindingType.getName().getLocalPart().startsWith(constrained
.getLocalPart())) {
policiedBinding.getRequiredIntents().add(intent);
break;
}
}
}
}
}
//trim intents specified in operations. First check for policysets specified on the operation
//and then in the parent implementation
if ( aBinding instanceof OperationsConfigurator ) {
OperationsConfigurator opConfigurator = (OperationsConfigurator)aBinding;
for ( ConfiguredOperation confOp : opConfigurator.getConfiguredOperations() ) {
List<Intent> opsIntentsCopy = new ArrayList<Intent>(confOp.getRequiredIntents());
trimInherentlyProvidedIntents(policiedBinding.getType(),
confOp.getRequiredIntents());
trimProvidedIntents(confOp.getRequiredIntents(), confOp.getPolicySets());
trimProvidedIntents(confOp.getRequiredIntents(), policiedBinding.getPolicySets());
determineApplicableDomainPolicySets(policiedBinding.getApplicablePolicySets(),
confOp,
policiedBinding.getType());
if (confOp.getRequiredIntents().size() > 0) {
new PolicyComputationException("The following are unfulfilled intents for operations configured in "
+ "binding - " + aBinding.getName() + "\nUnfulfilled Intents = " +
confOp.getRequiredIntents());
}
//the intents list could have been trimmed when matching for policysets
//since the bindings may need the original set of intents we copy that back
confOp.getRequiredIntents().clear();
confOp.getRequiredIntents().addAll(opsIntentsCopy);
}
}
trimInherentlyProvidedIntents(policiedBinding.getType(),
policiedBinding.getRequiredIntents());
trimProvidedIntents(policiedBinding.getRequiredIntents(), policiedBinding
.getPolicySets());
// determine additional policysets that match remaining intents
// TODO: resolved to domain policy registry and attach suitable
// policy sets to the binding
// for now using the SCA Definitions instead of registry
// if there are intents that are not provided by any policy set
// throw a warning
determineApplicableDomainPolicySets(source, policiedBinding);
//the intents list could have been trimmed when matching for policysets
//since the bindings may need the original set of intents we copy that back
policiedBinding.getRequiredIntents().clear();
policiedBinding.getRequiredIntents().addAll(intentsCopy);
}
}
}
private void determineApplicableDomainPolicySets(Contract contract,
PolicySetAttachPoint policiedBinding)
throws PolicyComputationException {
//if ( domainPolicySets != null) {
determineApplicableDomainPolicySets(policiedBinding.getApplicablePolicySets(),
policiedBinding,
policiedBinding.getType());
if ( policiedBinding.getRequiredIntents().size() > 0 ) {
if ( contract instanceof Service ) {
throw new PolicyComputationException("The following are unfulfilled intents for " +
"binding in service - " + contract.getName() + "\nUnfulfilled Intents = " +
policiedBinding.getRequiredIntents());
} else {
throw new PolicyComputationException("The are unfulfilled intents for " +
"binding in reference - " + contract.getName() + "\nUnfulfilled Intents = " +
policiedBinding.getRequiredIntents());
}
}
//}
}
private void addInheritedOpConfOnBindings(OperationsConfigurator source,
OperationsConfigurator target,
PolicySetAttachPoint attachPoint) throws PolicyValidationException {
boolean found = false;
List<ConfiguredOperation> additionalOperations = new ArrayList<ConfiguredOperation>();
for ( ConfiguredOperation sourceConfOp : source.getConfiguredOperations() ) {
for ( ConfiguredOperation targetConfOp : target.getConfiguredOperations() ) {
if ( sourceConfOp.getName().equals(targetConfOp.getName())) {
List<Intent> prunedIntents = computeInheritableIntents(attachPoint.getType(),
sourceConfOp.getRequiredIntents());
PolicyComputationUtils.addInheritedIntents(prunedIntents,
targetConfOp.getRequiredIntents());
List<PolicySet> prunedPolicySets = computeInheritablePolicySets(sourceConfOp.getPolicySets(),
attachPoint.getApplicablePolicySets());
PolicyComputationUtils.addInheritedPolicySets(prunedPolicySets, targetConfOp.getPolicySets(), true);
found = true;
break;
}
}
if ( !found ) {
additionalOperations.add(sourceConfOp);
}
}
if ( !additionalOperations.isEmpty() ) {
target.getConfiguredOperations().addAll(additionalOperations);
}
}
/*private void addInheritedOpConfOnBindings(Contract contract) {
for ( Binding binding : contract.getBindings() ) {
if ( binding instanceof OperationsConfigurator ) {
addInheritedOperationConfigurations(contract, (OperationsConfigurator)binding);
}
}
}*/
private void aggregateAndPruneApplicablePolicySets(List<PolicySet> source, List<PolicySet> target) {
target.addAll(source);
//strip duplicates
Hashtable<QName, PolicySet> policySetTable = new Hashtable<QName, PolicySet>();
for ( PolicySet policySet : target ) {
policySetTable.put(policySet.getName(), policySet);
}
target.clear();
target.addAll(policySetTable.values());
}
}
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