/*
* 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.definitions.xml;
import java.io.IOException;
import java.net.URI;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
import org.apache.tuscany.sca.contribution.processor.URLArtifactProcessor;
import org.apache.tuscany.sca.contribution.processor.URLArtifactProcessorExtensionPoint;
import org.apache.tuscany.sca.core.ExtensionPointRegistry;
import org.apache.tuscany.sca.core.UtilityExtensionPoint;
import org.apache.tuscany.sca.definitions.Definitions;
import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
import org.apache.tuscany.sca.monitor.MonitorFactory;
/**
* Default implementation of an extension point for XML definitionss.
*
* @version $Rev: 830738 $ $Date: 2009-10-28 19:29:50 +0000 (Wed, 28 Oct 2009) $
*/
public class DefaultDefinitionsExtensionPoint implements DefinitionsExtensionPoint {
private static final Logger logger = Logger.getLogger(DefaultDefinitionsExtensionPoint.class.getName());
private static final URI DEFINITIONS_URI = URI.create("META-INF/definitions.xml");
private ExtensionPointRegistry registry;
private MonitorFactory monitorFactory;
private Set<URL> documents = new HashSet<URL>();
private List<Definitions> definitions = new ArrayList<Definitions>();
private boolean documentsLoaded;
private boolean loaded;
public DefaultDefinitionsExtensionPoint(ExtensionPointRegistry registry) {
this.registry = registry;
this.monitorFactory = registry.getExtensionPoint(UtilityExtensionPoint.class).getUtility(MonitorFactory.class);
}
public void addDefinitionsDocument(URL url) {
documents.add(url);
}
public void removeDefinitionsDocument(URL url) {
documents.remove(url);
}
/**
* Load definitions declarations from META-INF/services/
* org.apache.tuscany.sca.contribution.processor.Definitions files
*/
private synchronized void loadDefinitionsDocuments() {
if (documentsLoaded)
return;
// Get the definitions declarations
Collection<ServiceDeclaration> definitionsDeclarations;
try {
definitionsDeclarations = registry.getServiceDiscovery().getServiceDeclarations(DEFINITIONS_FILE);
} catch (IOException e) {
throw new IllegalStateException(e);
}
// Find each definitions
for (ServiceDeclaration definitionsDeclaration : definitionsDeclarations) {
URL url = definitionsDeclaration.getResource(definitionsDeclaration.getClassName());
if (url == null) {
throw new IllegalArgumentException(definitionsDeclaration.getClassName() + " cannot be found");
}
documents.add(url);
}
documentsLoaded = true;
}
public synchronized List<Definitions> getDefinitions() {
if (!loaded) {
loadDefinitionsDocuments();
URLArtifactProcessorExtensionPoint processors =
registry.getExtensionPoint(URLArtifactProcessorExtensionPoint.class);
URLArtifactProcessor<Definitions> processor = processors.getProcessor(Definitions.class);
ProcessorContext context = new ProcessorContext(monitorFactory.createMonitor());
for (URL url : documents) {
Definitions def;
try {
def = processor.read(null, DEFINITIONS_URI, url, context);
definitions.add(def);
} catch (ContributionReadException e) {
logger.log(Level.SEVERE, e.getMessage(), e);
}
}
loaded = true;
}
return definitions;
}
public void addDefinitions(Definitions def) {
this.definitions.add(def);
}
public void removeDefinitions(Definitions def) {
this.definitions.remove(def);
}
}