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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 java.util.Map;
import org.apache.tuscany.sca.assembly.Binding;
import org.apache.tuscany.sca.assembly.Component;
import org.apache.tuscany.sca.assembly.ComponentReference;
import org.apache.tuscany.sca.assembly.ComponentService;
import org.apache.tuscany.sca.assembly.OptimizableBinding;
import org.apache.tuscany.sca.assembly.SCABinding;
import org.apache.tuscany.sca.policy.PolicySet;
import org.apache.tuscany.sca.policy.PolicySetAttachPoint;
/**
* This class encapsulates utility methods to deal with binding definitions
*
* @version $Rev$ $Date$
*/
abstract class BindingConfigurationUtil {
private static boolean hasCompatiblePolicySets(Binding refBinding, Binding svcBinding) {
boolean isCompatible = true;
if ( refBinding instanceof PolicySetAttachPoint && svcBinding instanceof PolicySetAttachPoint ) {
//TODO : need to add more compatibility checks at the policy attachment levels
for ( PolicySet svcPolicySet : ((PolicySetAttachPoint)svcBinding).getPolicySets() ) {
isCompatible = false;
for ( PolicySet refPolicySet : ((PolicySetAttachPoint)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;
}
static Binding matchBinding(Component targetComponent, ComponentService targetComponentService,
List<Binding> source, List<Binding> target,
Map<Binding, Binding> bindingMap, boolean isCallback) {
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 {
// If the service binding or callback binding was given a tentative URI by
// constructBindingURI() and the target component is running on a different node
// than the source component, add host/port information to the binding URI
if (bindingMap != null) {
Binding sourceNodeBinding = bindingMap.get(binding);
Binding targetNodeBinding = bindingMap.get(serviceBinding);
if (targetNodeBinding != null
&& sourceNodeBinding != null
&& targetNodeBinding != sourceNodeBinding) {
if (!isCallback) {
serviceBinding.setURI(targetNodeBinding.getURI() + serviceBinding.getURI());
bindingMap.remove(serviceBinding); // don't add this again
} else {
binding.setURI(sourceNodeBinding.getURI() + binding.getURI());
bindingMap.remove(binding); // don't add this again
}
}
}
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() + "--" + targetComponent.getName() + ".." + serviceBinding.getName());
} else {
cloned.setName(binding.getName() + "--" + serviceBinding.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);
}
}
/**
* Choose a binding for the reference based on the bindings available on the
* service
*
* @param reference The component reference
* @param service The component service
* @return Resolved binding
*/
static Binding resolveBindings(ComponentReference reference, Component component, ComponentService service,
Map<Binding, Binding> bindingMap) {
List<Binding> source = reference.getBindings();
List<Binding> target = service.getBindings();
return matchBinding(component, service, source, target, bindingMap, false);
}
/**
* @param reference
* @param service
* @return
*/
static Binding resolveCallbackBindings(ComponentReference reference, Component component, ComponentService service,
Map<Binding, Binding> bindingMap) {
List<Binding> source = reference.getCallback().getBindings();
List<Binding> target = service.getCallback().getBindings();
return matchBinding(component, service, source, target, bindingMap, true);
}
}
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