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Diffstat (limited to 'sca-java-1.x/branches/sca-java-1.6.2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultURLArtifactProcessorExtensionPoint.java')
| -rw-r--r-- | sca-java-1.x/branches/sca-java-1.6.2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultURLArtifactProcessorExtensionPoint.java | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/sca-java-1.x/branches/sca-java-1.6.2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultURLArtifactProcessorExtensionPoint.java b/sca-java-1.x/branches/sca-java-1.6.2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultURLArtifactProcessorExtensionPoint.java new file mode 100644 index 0000000000..7725360f6f --- /dev/null +++ b/sca-java-1.x/branches/sca-java-1.6.2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultURLArtifactProcessorExtensionPoint.java @@ -0,0 +1,244 @@ +/* + * 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.contribution.processor; + +import java.io.IOException; +import java.lang.reflect.Constructor; +import java.net.URI; +import java.net.URL; +import java.util.Map; +import java.util.Set; + +import javax.xml.stream.XMLInputFactory; +import javax.xml.stream.XMLOutputFactory; + +import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint; +import org.apache.tuscany.sca.contribution.resolver.ModelResolver; +import org.apache.tuscany.sca.contribution.service.ContributionReadException; +import org.apache.tuscany.sca.contribution.service.ContributionResolveException; +import org.apache.tuscany.sca.core.ExtensionPointRegistry; +import org.apache.tuscany.sca.core.UtilityExtensionPoint; +import org.apache.tuscany.sca.extensibility.ServiceDeclaration; +import org.apache.tuscany.sca.extensibility.ServiceDiscovery; +import org.apache.tuscany.sca.monitor.Monitor; +import org.apache.tuscany.sca.monitor.MonitorFactory; +import org.apache.tuscany.sca.monitor.Problem; +import org.apache.tuscany.sca.monitor.Problem.Severity; +import org.apache.tuscany.sca.monitor.impl.ProblemImpl; + + +/** + * The default implementation of a URL artifact processor extension point. + * + * @version $Rev$ $Date$ + */ +public class DefaultURLArtifactProcessorExtensionPoint + extends DefaultArtifactProcessorExtensionPoint<URLArtifactProcessor> + implements URLArtifactProcessorExtensionPoint { + + private ExtensionPointRegistry extensionPoints; + private StAXArtifactProcessor<?> staxProcessor; + private boolean loaded; + private Monitor monitor = null; + + /** + * Constructs a new extension point. + */ + public DefaultURLArtifactProcessorExtensionPoint(ExtensionPointRegistry extensionPoints) { + this.extensionPoints = extensionPoints; + ModelFactoryExtensionPoint modelFactories = this.extensionPoints.getExtensionPoint(ModelFactoryExtensionPoint.class); + XMLInputFactory inputFactory = modelFactories.getFactory(XMLInputFactory.class); + XMLOutputFactory outputFactory = modelFactories.getFactory(XMLOutputFactory.class); + UtilityExtensionPoint utilities = this.extensionPoints.getExtensionPoint(UtilityExtensionPoint.class); + MonitorFactory monitorFactory = utilities.getUtility(MonitorFactory.class); + if (monitorFactory != null) { + this.monitor = monitorFactory.createMonitor(); + } + StAXArtifactProcessorExtensionPoint staxProcessors = + extensionPoints.getExtensionPoint(StAXArtifactProcessorExtensionPoint.class); + staxProcessor = new ExtensibleStAXArtifactProcessor(staxProcessors, inputFactory, outputFactory, this.monitor); + } + + /** + * Report a exception. + * + * @param problems + * @param message + * @param model + */ + private void error(String message, Object model, Exception ex) { + if (monitor != null) { + Problem problem = new ProblemImpl(this.getClass().getName(), "contribution-validation-messages", Severity.ERROR, model, message, ex); + monitor.problem(problem); + } + } + + public void addArtifactProcessor(URLArtifactProcessor artifactProcessor) { + if (artifactProcessor.getArtifactType() != null) { + processorsByArtifactType.put((Object)artifactProcessor.getArtifactType(), artifactProcessor); + } + if (artifactProcessor.getModelType() != null) { + processorsByModelType.put(artifactProcessor.getModelType(), artifactProcessor); + } + } + + public void removeArtifactProcessor(URLArtifactProcessor artifactProcessor) { + if (artifactProcessor.getArtifactType() != null) { + processorsByArtifactType.remove((Object)artifactProcessor.getArtifactType()); + } + if (artifactProcessor.getModelType() != null) { + processorsByModelType.remove(artifactProcessor.getModelType()); + } + } + + @Override + public URLArtifactProcessor getProcessor(Class<?> modelType) { + loadProcessors(); + return super.getProcessor(modelType); + } + + @Override + public URLArtifactProcessor getProcessor(Object artifactType) { + loadProcessors(); + return super.getProcessor(artifactType); + } + + /** + * Lazily load artifact processors registered in the extension point. + */ + private synchronized void loadProcessors() { + if (loaded) + return; + + // Get the processor service declarations + Set<ServiceDeclaration> processorDeclarations; + try { + processorDeclarations = ServiceDiscovery.getInstance().getServiceDeclarations(URLArtifactProcessor.class); + } catch (IOException e) { + IllegalStateException ie = new IllegalStateException(e); + error("IllegalStateException", staxProcessor, ie); + throw ie; + } + + for (ServiceDeclaration processorDeclaration: processorDeclarations) { + Map<String, String> attributes = processorDeclaration.getAttributes(); + // Load a URL artifact processor + String artifactType = attributes.get("type"); + String modelTypeName = attributes.get("model"); + + // Create a processor wrapper and register it + URLArtifactProcessor processor = new LazyURLArtifactProcessor(artifactType, modelTypeName, + processorDeclaration, extensionPoints, staxProcessor, monitor); + addArtifactProcessor(processor); + } + + loaded = true; + } + + /** + * A wrapper around an Artifact processor class allowing lazy loading and + * initialization of artifact processors. + */ + private static class LazyURLArtifactProcessor implements URLArtifactProcessor { + + private ExtensionPointRegistry extensionPoints; + private String artifactType; + private String modelTypeName; + private ServiceDeclaration processorDeclaration; + private URLArtifactProcessor processor; + private Class<?> modelType; + private StAXArtifactProcessor<?> staxProcessor; + private Monitor monitor; + + LazyURLArtifactProcessor(String artifactType, + String modelTypeName, + ServiceDeclaration processorDeclaration, + ExtensionPointRegistry extensionPoints, + StAXArtifactProcessor<?> staxProcessor, + Monitor monitor) { + this.artifactType = artifactType; + this.modelTypeName = modelTypeName; + this.processorDeclaration = processorDeclaration; + this.extensionPoints = extensionPoints; + this.staxProcessor = staxProcessor; + this.monitor = monitor; + } + + public String getArtifactType() { + return artifactType; + } + + private void error(String message, Object model, Exception ex) { + if (monitor != null) { + Problem problem = new ProblemImpl(this.getClass().getName(), "contribution-validation-messages", Severity.ERROR, model, message, ex); + monitor.problem(problem); + } + } + + @SuppressWarnings("unchecked") + private URLArtifactProcessor getProcessor() { + if (processor == null) { + try { + ModelFactoryExtensionPoint modelFactories = extensionPoints.getExtensionPoint(ModelFactoryExtensionPoint.class); + Class<URLArtifactProcessor> processorClass = (Class<URLArtifactProcessor>)processorDeclaration.loadClass(); + try { + Constructor<URLArtifactProcessor> constructor = processorClass.getConstructor(ModelFactoryExtensionPoint.class, Monitor.class); + processor = constructor.newInstance(modelFactories, monitor); + } catch (NoSuchMethodException e) { + try { + Constructor<URLArtifactProcessor> constructor = processorClass.getConstructor(ModelFactoryExtensionPoint.class, StAXArtifactProcessor.class, Monitor.class); + processor = constructor.newInstance(modelFactories, staxProcessor, monitor); + } catch (NoSuchMethodException e2) { + Constructor<URLArtifactProcessor> constructor = processorClass.getConstructor(ExtensionPointRegistry.class, Monitor.class); + processor = constructor.newInstance(extensionPoints, monitor); + } + } + } catch (Exception e) { + IllegalStateException ie = new IllegalStateException(e); + error("IllegalStateException", processor, ie); + throw ie; + } + } + return processor; + } + + public Object read(URL contributionURL, URI artifactURI, URL artifactURL) throws ContributionReadException { + return getProcessor().read(contributionURL, artifactURI, artifactURL); + } + + public Class<?> getModelType() { + if (modelTypeName != null && modelType == null) { + try { + modelType = processorDeclaration.loadClass(modelTypeName); + } catch (ClassNotFoundException e) { + IllegalStateException ie = new IllegalStateException(e); + error("IllegalStateException", processorDeclaration, ie); + throw ie; + } + } + return modelType; + } + + @SuppressWarnings("unchecked") + public void resolve(Object model, ModelResolver resolver) throws ContributionResolveException { + getProcessor().resolve(model, resolver); + } + + } +} |