diff options
Diffstat (limited to 'sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/implementation/composite/CompositeLoader.java')
| -rw-r--r-- | sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/implementation/composite/CompositeLoader.java | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/implementation/composite/CompositeLoader.java b/sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/implementation/composite/CompositeLoader.java new file mode 100644 index 0000000000..008ee59de8 --- /dev/null +++ b/sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/implementation/composite/CompositeLoader.java @@ -0,0 +1,224 @@ +/* + * 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()); + } + } + } +} |