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Diffstat (limited to 'sca-java-1.x/tags/1.6.1/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/service/DefaultContributionListenerExtensionPoint.java')
-rw-r--r-- | sca-java-1.x/tags/1.6.1/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/service/DefaultContributionListenerExtensionPoint.java | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/1.6.1/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/service/DefaultContributionListenerExtensionPoint.java b/sca-java-1.x/tags/1.6.1/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/service/DefaultContributionListenerExtensionPoint.java new file mode 100644 index 0000000000..1ab80e344b --- /dev/null +++ b/sca-java-1.x/tags/1.6.1/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/service/DefaultContributionListenerExtensionPoint.java @@ -0,0 +1,118 @@ +/* + * 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.service; + +import java.io.IOException; +import java.lang.reflect.Constructor; +import java.lang.reflect.InvocationTargetException; +import java.util.List; +import java.util.Set; +import java.util.concurrent.CopyOnWriteArrayList; + +import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint; +import org.apache.tuscany.sca.core.ExtensionPointRegistry; +import org.apache.tuscany.sca.extensibility.ServiceDeclaration; +import org.apache.tuscany.sca.extensibility.ServiceDiscovery; + +/** + * Default implementation of a contribution listener extension point. + * + * @version $Rev$ $Date$ + */ +public class DefaultContributionListenerExtensionPoint implements ContributionListenerExtensionPoint { + + private List<ContributionListener> listeners = new CopyOnWriteArrayList<ContributionListener>(); + private boolean loadedListeners; + private ModelFactoryExtensionPoint modelFactories; + + /** + * Constructs a new DefaultContributionListenerExtensionPoint. + * + */ + public DefaultContributionListenerExtensionPoint(ModelFactoryExtensionPoint modelFactories) { + this.modelFactories = modelFactories; + } + + /** + * Constructs a new DefaultContributionListenerExtensionPoint. + * + */ + public DefaultContributionListenerExtensionPoint(ExtensionPointRegistry extensionPoints) { + this.modelFactories = extensionPoints.getExtensionPoint(ModelFactoryExtensionPoint.class); + } + + public void addContributionListener(ContributionListener listener) { + listeners.add(listener); + } + + public List<ContributionListener> getContributionListeners() { + loadListeners(); + return listeners; + } + + public void removeContributionListener(ContributionListener listener) { + listeners.remove(listener); + } + + /** + * Dynamically load listeners declared under META-INF/services + */ + @SuppressWarnings("unchecked") + private synchronized void loadListeners() { + if (loadedListeners) + return; + + // Get the listener service declarations + Set<ServiceDeclaration> listenerDeclarations; + try { + listenerDeclarations = ServiceDiscovery.getInstance().getServiceDeclarations(ContributionListener.class); + } catch (IOException e) { + throw new IllegalStateException(e); + } + + // Load and instantiate the listeners + for (ServiceDeclaration listenerDeclaration: listenerDeclarations) { + ContributionListener listener; + try { + Class<ContributionListener> listenerClass = (Class<ContributionListener>)listenerDeclaration.loadClass(); + try { + Constructor<ContributionListener> constructor = listenerClass.getConstructor(ModelFactoryExtensionPoint.class); + try { + listener = constructor.newInstance(modelFactories); + } catch (InvocationTargetException e) { + throw new IllegalArgumentException(e); + } + } catch (NoSuchMethodException e) { + listener = listenerClass.newInstance(); + } + } catch (ClassNotFoundException e) { + throw new IllegalArgumentException(e); + } catch (InstantiationException e) { + throw new IllegalArgumentException(e); + } catch (IllegalAccessException e) { + throw new IllegalArgumentException(e); + } + addContributionListener(listener); + } + + loadedListeners = true; + } + +} |