diff options
Diffstat (limited to 'java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultUtilityExtensionPoint.java')
| -rw-r--r-- | java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultUtilityExtensionPoint.java | 219 |
1 files changed, 0 insertions, 219 deletions
diff --git a/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultUtilityExtensionPoint.java b/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultUtilityExtensionPoint.java deleted file mode 100644 index 41e2377db5..0000000000 --- a/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultUtilityExtensionPoint.java +++ /dev/null @@ -1,219 +0,0 @@ -/* - * 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.core; - -import static org.apache.tuscany.sca.extensibility.ServiceHelper.newInstance; - -import java.lang.reflect.Modifier; -import java.util.HashSet; -import java.util.IdentityHashMap; -import java.util.Iterator; -import java.util.Map; -import java.util.Set; -import java.util.concurrent.ConcurrentHashMap; - -import org.apache.tuscany.sca.extensibility.ServiceDeclaration; - -/** - * Default implementation of an extension point to hold Tuscany utility utilities. - * - * @version $Rev$ $Date$ - */ -public class DefaultUtilityExtensionPoint implements UtilityExtensionPoint { - private Map<Object, Object> utilities = new ConcurrentHashMap<Object, Object>(); - - private ExtensionPointRegistry registry; - /** - * Constructs a new extension point. - */ - public DefaultUtilityExtensionPoint(ExtensionPointRegistry extensionPoints) { - this.registry = extensionPoints; - } - - /** - * Add a utility to the extension point. This default implementation - * stores utilities against the interfaces that they implement. - * - * @param utility The instance of the utility - * - * @throws IllegalArgumentException if utility is null - */ - public synchronized void addUtility(Object utility) { - addUtility(null, utility); - } - - public synchronized void addUtility(Object key, Object utility) { - if (utility == null) { - throw new IllegalArgumentException("Cannot register null as a Service"); - } - - if (utility instanceof LifeCycleListener) { - ((LifeCycleListener)utility).start(); - } - - if (key == null) { - Class<?> cls = utility.getClass(); - Set<Class<?>> interfaces = getAllInterfaces(cls); - for (Class<?> i : interfaces) { - utilities.put(i, utility); - } - if (interfaces.isEmpty() || isConcreteClass(cls)) { - utilities.put(cls, utility); - } - } else { - utilities.put(key, utility); - } - } - - /** - * Get the utility by the interface that it implements - * - * @param utilityType The lookup key (utility interface) - * @return The instance of the utility - * - * @throws IllegalArgumentException if utilityType is null - */ - public synchronized <T> T getUtility(Class<T> utilityType) { - return getUtility(utilityType, null); - } - - /** - * Remove a utility based on the interface that it implements - * - * @param utility The utility to remove - * - * @throws IllegalArgumentException if utility is null - */ - public synchronized void removeUtility(Object utility) { - if (utility == null) { - throw new IllegalArgumentException("Cannot remove null as a Service"); - } - - if(utility instanceof LifeCycleListener) { - ((LifeCycleListener) utility).stop(); - } - - for (Iterator<Map.Entry<Object, Object>> i = utilities.entrySet().iterator(); i.hasNext();) { - Map.Entry<Object, Object> entry = i.next(); - if (entry.getValue() == utility) { - i.remove(); - } - } - } - - /** - * Returns the set of interfaces implemented by the given class and its - * ancestors or a blank set if none - */ - private static Set<Class<?>> getAllInterfaces(Class<?> clazz) { - Set<Class<?>> implemented = new HashSet<Class<?>>(); - getAllInterfaces(clazz, implemented); - implemented.remove(LifeCycleListener.class); - return implemented; - } - - private static void getAllInterfaces(Class<?> clazz, Set<Class<?>> implemented) { - Class<?>[] interfaces = clazz.getInterfaces(); - for (Class<?> interfaze : interfaces) { - if (Modifier.isPublic(interfaze.getModifiers())) { - implemented.add(interfaze); - } - } - Class<?> superClass = clazz.getSuperclass(); - // Object has no superclass so check for null - if (superClass != null && !superClass.equals(Object.class)) { - getAllInterfaces(superClass, implemented); - } - } - - public synchronized <T> T getUtility(Class<T> utilityType, Object key) { - if (utilityType == null) { - throw new IllegalArgumentException("Cannot lookup Service of type null"); - } - - if (key == null) { - key = utilityType; - } - - Object utility = utilities.get(key); - - if (utility == null) { - - // Dynamically load a utility class declared under META-INF/services/"utilityType" - try { - ServiceDeclaration utilityDeclaration = - registry.getServiceDiscovery().getServiceDeclaration(utilityType.getName()); - Class<?> utilityClass = null; - if (utilityDeclaration != null) { - utilityClass = utilityDeclaration.loadClass(); - } else if (isConcreteClass(utilityType)) { - utilityClass = utilityType; - key = utilityType; - } - if (utilityClass != null) { - // Construct the utility - if (utilityDeclaration != null) { - utility = newInstance(registry, utilityDeclaration); - } else { - try { - utility = newInstance(utilityClass, ExtensionPointRegistry.class, registry); - } catch (NoSuchMethodException e) { - utility = newInstance(utilityClass); - } - } - // Cache the loaded utility - if (key == utilityType) { - addUtility(utility); - } else { - addUtility(key, utility); - } - } - } catch (Throwable e) { - throw new IllegalArgumentException(e); - } - } - return utilityType.cast(utility); - } - - private boolean isConcreteClass(Class<?> utilityType) { - int modifiers = utilityType.getModifiers(); - return !utilityType.isInterface() && Modifier.isPublic(modifiers) && !Modifier.isAbstract(modifiers); - } - - public synchronized void start() { - // NOOP - } - - public synchronized void stop() { - // Get a unique map as an extension point may exist in the map by different keys - Map<LifeCycleListener, LifeCycleListener> map = new IdentityHashMap<LifeCycleListener, LifeCycleListener>(); - for (Object util : utilities.values()) { - if (util instanceof LifeCycleListener) { - LifeCycleListener listener = (LifeCycleListener)util; - map.put(listener, listener); - } - } - for (LifeCycleListener listener : map.values()) { - listener.stop(); - } - utilities.clear(); - } - -} |