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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.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.tuscany.sca.assembly.AssemblyFactory;
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.Composite;
import org.apache.tuscany.sca.assembly.CompositeReference;
import org.apache.tuscany.sca.assembly.Implementation;
import org.apache.tuscany.sca.assembly.Reference;
import org.apache.tuscany.sca.assembly.Wire;
import org.apache.tuscany.sca.assembly.builder.CompositeBuilder;
import org.apache.tuscany.sca.assembly.builder.CompositeBuilderException;
import org.apache.tuscany.sca.definitions.Definitions;
import org.apache.tuscany.sca.interfacedef.InterfaceContractMapper;
import org.apache.tuscany.sca.monitor.Monitor;
/**
* A composite builder that wires component references.
*
* @version $Rev$ $Date$
*/
public class ComponentReferenceWireBuilderImpl extends BaseBuilderImpl implements CompositeBuilder {
public ComponentReferenceWireBuilderImpl(AssemblyFactory assemblyFactory, InterfaceContractMapper interfaceContractMapper) {
super(assemblyFactory, null, null, null, interfaceContractMapper);
}
public String getID() {
return "org.apache.tuscany.sca.assembly.builder.ComponentReferenceWireBuilder";
}
public void build(Composite composite, Definitions definitions, Monitor monitor) throws CompositeBuilderException {
wireComponentReferences(composite, monitor);
}
/**
* Wire component references to component services and connect promoted
* services/references to component services/references inside a composite.
*
* @param composite
*/
protected void wireComponentReferences(Composite composite, Monitor monitor) {
// Wire nested composites recursively
for (Component component : composite.getComponents()) {
Implementation implementation = component.getImplementation();
if (implementation instanceof Composite) {
wireComponentReferences((Composite)implementation, monitor);
}
}
// Index components, services and references
Map<String, Component> components = new HashMap<String, Component>();
Map<String, ComponentService> componentServices = new HashMap<String, ComponentService>();
Map<String, ComponentReference> componentReferences = new HashMap<String, ComponentReference>();
indexComponentsServicesAndReferences(composite, components, componentServices, componentReferences);
// Connect component references as described in wires
connectWires(composite, componentServices, componentReferences, monitor);
// Validate that references are wired or promoted, according
// to their multiplicity
for (ComponentReference componentReference : componentReferences.values()) {
if (!ReferenceConfigurationUtil.validateMultiplicityAndTargets(componentReference.getMultiplicity(), componentReference
.getTargets(), componentReference.getBindings())) {
if (componentReference.getTargets().isEmpty()) {
// No warning if the reference is promoted out of the current composite
boolean promoted = false;
for (Reference reference : composite.getReferences()) {
CompositeReference compositeReference = (CompositeReference)reference;
if (compositeReference.getPromotedReferences().contains(componentReference)) {
promoted = true;
break;
}
}
if (!promoted && !componentReference.isCallback()) {
warning(monitor, "ReferenceWithoutTargets", composite, composite.getName().toString(),
componentReference.getName());
}
} else {
warning(monitor, "TooManyReferenceTargets", composite, componentReference.getName());
}
}
}
// Finally clear the original reference target lists as we now have
// bindings to represent the targets
// for (ComponentReference componentReference : componentReferences.values()) {
// componentReference.getTargets().clear();
// }
}
/**
* Resolve wires and connect the sources to their targets
*
* @param composite
* @param componentServices
* @param componentReferences
* @param problems
*/
private void connectWires(Composite composite,
Map<String, ComponentService> componentServices,
Map<String, ComponentReference> componentReferences,
Monitor monitor) {
// For each wire, resolve the source reference, the target service, and
// add it to the list of targets of the reference
List<Wire> wires = composite.getWires();
for (int i = 0, n = wires.size(); i < n; i++) {
Wire wire = wires.get(i);
ComponentReference resolvedReference;
ComponentService resolvedService;
// Resolve the source reference
ComponentReference source = wire.getSource();
if (source != null && source.isUnresolved()) {
resolvedReference = componentReferences.get(source.getName());
if (resolvedReference != null) {
wire.setSource(resolvedReference);
} else {
warning(monitor, "WireSourceNotFound", composite, source.getName());
}
} else {
resolvedReference = wire.getSource();
}
// Resolve the target service
ComponentService target = wire.getTarget();
if (target != null && target.isUnresolved()) {
resolvedService = componentServices.get(target.getName());
if (resolvedService != null) {
wire.setTarget(target);
} else {
warning(monitor, "WireTargetNotFound", composite, source.getName());
}
} else {
resolvedService = wire.getTarget();
}
// Add the target service to the list of targets of the
// reference
if (resolvedReference != null && resolvedService != null) {
// Check that the target component service provides
// a superset of
// the component reference interface
if (resolvedReference.getInterfaceContract() == null || interfaceContractMapper
.isCompatible(resolvedReference.getInterfaceContract(), resolvedService.getInterfaceContract())) {
//resolvedReference.getTargets().add(resolvedService);
resolvedReference.getTargets().add(wire.getTarget());
} else {
warning(monitor, "WireIncompatibleInterface", composite, source.getName(), target.getName());
}
}
}
// Clear the list of wires
composite.getWires().clear();
}
}
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