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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.core.implementation.composite;
import static javax.xml.stream.XMLStreamConstants.END_ELEMENT;
import static javax.xml.stream.XMLStreamConstants.START_ELEMENT;
import static org.osoa.sca.Constants.SCA_NS;
import java.net.URI;
import java.util.List;
import java.util.Map;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import org.apache.tuscany.spi.deployer.DeploymentContext;
import org.apache.tuscany.spi.extension.LoaderExtension;
import org.apache.tuscany.spi.loader.InvalidServiceException;
import org.apache.tuscany.spi.loader.InvalidWireException;
import org.apache.tuscany.spi.loader.LoaderException;
import org.apache.tuscany.spi.loader.LoaderRegistry;
import org.apache.tuscany.spi.model.ComponentDefinition;
import org.apache.tuscany.spi.model.ComponentType;
import org.apache.tuscany.spi.model.CompositeComponentType;
import org.apache.tuscany.spi.model.Implementation;
import org.apache.tuscany.spi.model.Include;
import org.apache.tuscany.spi.model.ModelObject;
import org.apache.tuscany.spi.model.Property;
import org.apache.tuscany.spi.model.ReferenceDefinition;
import org.apache.tuscany.spi.model.ReferenceTarget;
import org.apache.tuscany.spi.model.ServiceDefinition;
import org.apache.tuscany.spi.model.WireDefinition;
import org.apache.tuscany.spi.services.artifact.ArtifactRepository;
import org.osoa.sca.annotations.Reference;
/**
* Loads a composite component definition from an XML-based assembly file
*
* @version $Rev$ $Date$
*/
public class CompositeLoader extends LoaderExtension<CompositeComponentType> {
public static final QName COMPOSITE = new QName(SCA_NS, "composite");
public static final String URI_DELIMITER = "/";
private final ArtifactRepository artifactRepository;
public CompositeLoader(@Reference
LoaderRegistry registry, @Reference
ArtifactRepository artifactRepository) {
super(registry);
this.artifactRepository = artifactRepository;
}
public QName getXMLType() {
return COMPOSITE;
}
public CompositeComponentType load(ModelObject object, XMLStreamReader reader, DeploymentContext deploymentContext)
throws XMLStreamException, LoaderException {
String name = reader.getAttributeValue(null, "name");
String targetNamespace = reader.getAttributeValue(null, "targetNamespace");
boolean autowire = Boolean.parseBoolean(reader.getAttributeValue(null, "autowire"));
CompositeComponentType<ServiceDefinition, ReferenceDefinition, Property<?>> type = new CompositeComponentType<ServiceDefinition, ReferenceDefinition, Property<?>>(
new QName(
targetNamespace,
name));
type.setAutowire(autowire);
boolean done = false;
while (!done) {
switch (reader.next()) {
case START_ELEMENT:
boolean oldAutowire = deploymentContext.isAutowire();
deploymentContext.setAutowire(autowire);
ModelObject o = registry.load(type, reader, deploymentContext);
deploymentContext.setAutowire(oldAutowire);
if (o instanceof ServiceDefinition) {
type.add((ServiceDefinition)o);
} else if (o instanceof ReferenceDefinition) {
type.add((ReferenceDefinition)o);
} else if (o instanceof Property<?>) {
type.add((Property<?>)o);
} else if (o instanceof ComponentDefinition<?>) {
type.add((ComponentDefinition<?>)o);
} else if (o instanceof Include) {
type.add((Include)o);
} else if (o instanceof WireDefinition) {
type.add((WireDefinition)o);
} else {
// add as an unknown model extension
if (o != null) {
type.getExtensions().put(o.getClass(), o);
}
}
reader.next();
break;
case END_ELEMENT:
if (COMPOSITE.equals(reader.getName())) {
// if there are wire defintions then link them up to the
// relevant components
resolveWires(type);
verifyCompositeCompleteness(type);
done = true;
break;
}
}
}
for (ComponentDefinition<? extends Implementation<?>> c : type.getComponents().values()) {
// PropertyHelper.processProperties(type, c, deploymentContext);
}
return type;
}
protected void resolveWires(CompositeComponentType<ServiceDefinition, ReferenceDefinition, Property<?>> composite)
throws InvalidWireException {
ComponentDefinition componentDefinition;
ServiceDefinition serviceDefinition;
List<WireDefinition> wireDefns = composite.getDeclaredWires();
for (WireDefinition wire : wireDefns) {
URI targetUri = wire.getTarget();
// validate the target before finding the source
validateTarget(targetUri, composite);
String sourceName = wire.getSource().getPath(); // new
// QualifiedName(wire.getSource().getPath());
serviceDefinition = composite.getDeclaredServices().get(sourceName);
if (serviceDefinition != null) {
serviceDefinition.setTarget(wire.getTarget());
} else {
componentDefinition = composite.getDeclaredComponents().get(sourceName);
if (componentDefinition != null) {
if (wire.getSource().getFragment() == null) {
throw new InvalidWireException("Source reference not specified", sourceName);
}
URI referenceName = URI.create(wire.getSource().getFragment());
ReferenceTarget referenceTarget = createReferenceTarget(referenceName,
targetUri,
componentDefinition);
componentDefinition.add(referenceTarget);
} else {
throw new InvalidWireException("Source not found", sourceName);
}
}
}
}
private ReferenceTarget createReferenceTarget(URI componentReferenceName,
URI target,
ComponentDefinition componentDefn) throws InvalidWireException {
ComponentType componentType = componentDefn.getImplementation().getComponentType();
if (componentReferenceName == null) {
// if there is ambiguity in determining the source of the wire or
// there is no reference to be wired
if (componentType.getReferences().size() > 1 || componentType.getReferences().isEmpty()) {
throw new InvalidWireException("Unable to determine unique source reference");
} else {
Map references = componentType.getReferences();
ReferenceDefinition definition = (ReferenceDefinition)references.values().iterator().next();
componentReferenceName = definition.getUri();
}
}
ReferenceTarget referenceTarget = new ReferenceTarget();
referenceTarget.setReferenceName(componentReferenceName);
referenceTarget.addTarget(target);
return referenceTarget;
}
protected void verifyCompositeCompleteness(CompositeComponentType<ServiceDefinition, ReferenceDefinition, Property<?>> composite)
throws InvalidServiceException {
// check if all of the composite services have been wired
for (ServiceDefinition svcDefn : composite.getDeclaredServices().values()) {
if (svcDefn.getTarget() == null) {
String identifier = svcDefn.getUri().toString();
throw new InvalidServiceException("Composite service not wired to a target", identifier);
}
}
}
private void validateTarget(URI target,
CompositeComponentType<ServiceDefinition, ReferenceDefinition, Property<?>> composite)
throws InvalidWireException {
// if target is not a reference of the composite
String targetName = target.getPath();
if (composite.getReferences().get(targetName) == null) {
ComponentDefinition<?> targetDefinition = composite.getDeclaredComponents().get(targetName);
// if a target component exists in this composite
if (targetDefinition != null) {
Implementation<?> implementation = targetDefinition.getImplementation();
ComponentType<?, ?, ?> componentType = implementation.getComponentType();
Map<String, ? extends ServiceDefinition> services = componentType.getServices();
if (target.getFragment() == null) {
if (services.size() > 1 || services.isEmpty()) {
throw new InvalidWireException("Ambiguous target", target.toString());
}
} else {
if (services.get(target.getFragment()) == null) {
throw new InvalidWireException("Invalid target service", target.toString());
}
}
} else {
throw new InvalidWireException("Target not found", target.toString());
}
}
}
}
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