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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.List;
import org.apache.tuscany.sca.assembly.Binding;
import org.apache.tuscany.sca.assembly.Component;
import org.apache.tuscany.sca.assembly.ComponentService;
import org.apache.tuscany.sca.assembly.CompositeService;
import org.apache.tuscany.sca.assembly.Endpoint;
import org.apache.tuscany.sca.assembly.OptimizableBinding;
import org.apache.tuscany.sca.assembly.SCABinding;
import org.apache.tuscany.sca.assembly.builder.EndpointBuilder;
import org.apache.tuscany.sca.monitor.Monitor;
import org.apache.tuscany.sca.monitor.Problem;
import org.apache.tuscany.sca.monitor.Problem.Severity;
import org.apache.tuscany.sca.policy.PolicySet;
import org.apache.tuscany.sca.policy.PolicySubject;
/**
* A factory for the Endpoint model.
*
* @version $Rev$ $Date$
*/
public abstract class EndpointBuilderImpl implements EndpointBuilder {
public EndpointBuilderImpl (){
}
private void warning(Monitor monitor, String message, Object model, String... messageParameters) {
if (monitor != null){
Problem problem = monitor.createProblem(this.getClass().getName(), "assembly-validation-messages", Severity.WARNING, model, message, (Object[])messageParameters);
monitor.problem(problem);
}
}
private void error(Monitor monitor, String message, Object model, Exception ex) {
if (monitor != null){
Problem problem = null;
problem = monitor.createProblem(this.getClass().getName(), "assembly-validation-messages", Severity.ERROR, model, message, ex);
monitor.problem(problem);
}
}
/**
* Resolve an endpoint against the provided target information and the
* set of candidate bindings.
*/
public void build(Endpoint endpoint, Monitor monitor) {
// If this endpoint is not fully configured then don't try and resolve it
if (endpoint.getTargetComponentService() == null){
return;
}
// Does the reference expect callbacks
boolean bidirectional = false;
if (endpoint.getSourceComponentReference().getInterfaceContract() != null &&
endpoint.getSourceComponentReference().getInterfaceContract().getCallbackInterface() != null) {
bidirectional = true;
}
// if the target service is a promoted service then find the
// service it promotes
if (endpoint.getTargetComponentService().getService() instanceof CompositeService) {
CompositeService compositeService = (CompositeService) endpoint.getTargetComponentService().getService();
// Find the promoted component service
ComponentService promotedComponentService = ServiceConfigurationUtil.getPromotedComponentService(compositeService);
if (promotedComponentService != null && !promotedComponentService.isUnresolved()) {
endpoint.setTargetComponentService(promotedComponentService);
}
}
try {
PolicyConfigurationUtil.determineApplicableBindingPolicySets(endpoint.getSourceComponentReference(),
endpoint.getTargetComponentService());
} catch ( Exception e ) {
error(monitor, "PolicyRelatedException", endpoint, e);
}
// Match the binding against the bindings of the target service
Binding resolvedBinding = matchBinding(endpoint.getTargetComponent(),
endpoint.getTargetComponentService(),
endpoint.getCandidateBindings(),
endpoint.getTargetComponentService().getBindings());
if (resolvedBinding == null) {
warning(monitor, "NoMatchingBinding",
endpoint.getSourceComponentReference(),
endpoint.getSourceComponentReference().getName(),
endpoint.getTargetComponentService().getName());
} else {
endpoint.setSourceBinding(resolvedBinding);
}
if (bidirectional) {
Binding resolvedCallbackBinding = matchBinding(endpoint.getTargetComponent(),
endpoint.getTargetComponentService(),
endpoint.getSourceComponentReference().getCallback().getBindings(),
endpoint.getTargetComponentService().getCallback().getBindings());
if (resolvedBinding == null) {
warning(monitor, "NoMatchingCallbackBinding",
endpoint.getSourceComponentReference(),
endpoint.getSourceComponentReference().getName(),
endpoint.getTargetComponentService().getName());
} else {
endpoint.setSourceCallbackBinding(resolvedCallbackBinding);
}
}
}
private boolean hasCompatiblePolicySets(Binding refBinding, Binding svcBinding) {
boolean isCompatible = true;
if ( refBinding instanceof PolicySubject && svcBinding instanceof PolicySubject ) {
//TODO : need to add more compatibility checks at the policy attachment levels
for ( PolicySet svcPolicySet : ((PolicySubject)svcBinding).getPolicySets() ) {
isCompatible = false;
for ( PolicySet refPolicySet : ((PolicySubject)refBinding).getPolicySets() ) {
if ( svcPolicySet.equals(refPolicySet) ) {
isCompatible = true;
break;
}
}
//if there exists no matching policy set in the reference binding
if ( !isCompatible ) {
return isCompatible;
}
}
}
return isCompatible;
}
private Binding matchBinding(Component targetComponent, ComponentService targetComponentService, List<Binding> source, List<Binding> target) {
List<Binding> matched = new ArrayList<Binding>();
// Find the corresponding bindings from the service side
for (Binding binding : source) {
for (Binding serviceBinding : target) {
if (binding.getClass() == serviceBinding.getClass() &&
hasCompatiblePolicySets(binding, serviceBinding)) {
try {
Binding cloned = (Binding)binding.clone();
//Customise the binding name to make it unique
// regardless of how many bindings or targets there are
if ( targetComponent != null){
cloned.setName(binding.getName());
} else {
cloned.setName(binding.getName());
}
// Set the binding URI to the URI of the target service
// that has been matched
if (binding.getURI() == null) {
cloned.setURI(serviceBinding.getURI());
}
if (binding instanceof OptimizableBinding) {
OptimizableBinding endpoint = ((OptimizableBinding)cloned);
endpoint.setTargetComponent(targetComponent);
endpoint.setTargetComponentService(targetComponentService);
endpoint.setTargetBinding(serviceBinding);
}
matched.add(cloned);
break;
} catch (Exception ex) {
// do nothing
}
}
}
}
if (matched.isEmpty()) {
// No matching binding
return null;
} else {
for (Binding binding : matched) {
// If binding.sca is present, use it
if (SCABinding.class.isInstance(binding)) {
return binding;
}
}
// Use the first one
return matched.get(0);
}
}
}
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