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  /*
   * 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.util.Map;
 import java.util.Set;
 
Default implementation of a registry to hold all the Tuscany core extension points. As the point of contact for all extension artifacts this registry allows loaded extensions to find all other parts of the system and register themselves appropriately.

Version:
$Rev: 937291 $ $Date: 2010-04-23 14:41:24 +0100 (Fri, 23 Apr 2010) $
Tuscany.spi.extension.asclient:
 
     protected Map<Class<?>, ObjectextensionPoints = new HashMap<Class<?>, Object>();
     private ServiceDiscovery discovery;
    
Constructs a new registry.
 
     public DefaultExtensionPointRegistry() {
         this. = ServiceDiscovery.getInstance();
     }
     
     public DefaultExtensionPointRegistry(ServiceDiscovery discovery) {
         this. = discovery;
     }

    
Add an extension point to the registry. This default implementation stores extensions against the interfaces that they implement.

Parameters:
extensionPoint The instance of the extension point
Throws:
java.lang.IllegalArgumentException if extensionPoint is null
 
     public synchronized void addExtensionPoint(Object extensionPoint) {
         addExtensionPoint(extensionPointnull);
     }
 
     public synchronized void addExtensionPoint(Object extensionPointServiceDeclaration declaration) {
         if (extensionPoint == null) {
             throw new IllegalArgumentException("Cannot register null as an ExtensionPoint");
         }
         ServiceHelper.start(extensionPoint);
         
         Set<Class<?>> interfaces = getAllInterfaces(extensionPoint.getClass());
         for (Class<?> i : interfaces) {
             registerExtensionPoint(iextensionPointdeclaration);
         }
     }
 
     protected void registerExtensionPoint(Class<?> iObject extensionPointServiceDeclaration declaration) {
         .put(iextensionPoint);
     }

    
Get the extension point by the interface that it implements

Parameters:
extensionPointType The lookup key (extension point interface)
Returns:
The instance of the extension point
Throws:
java.lang.IllegalArgumentException if extensionPointType is null
 
     public synchronized <T> T getExtensionPoint(Class<T> extensionPointType) {
         if (extensionPointType == null) {
             throw new IllegalArgumentException("Cannot lookup ExtensionPoint of type null");
         }
 
        Object extensionPoint = findExtensionPoint(extensionPointType);
        if (extensionPoint == null) {
            // Dynamically load an extension point class declared under META-INF/services
            try {
                ServiceDeclaration extensionPointDeclaration =
                    getServiceDiscovery().getServiceDeclaration(extensionPointType);
                if (extensionPointDeclaration != null) {
                    extensionPoint = newInstance(thisextensionPointDeclaration);
                    // Cache the loaded extension point
                    addExtensionPoint(extensionPointextensionPointDeclaration);
                }
            } catch (Throwable e) {
                throw new IllegalArgumentException(e);
            }
        }
        return extensionPointType.cast(extensionPoint);
    }
    protected <T> Object findExtensionPoint(Class<T> extensionPointType) {
        return .get(extensionPointType);
    }

    
Remove an extension point based on the interface that it implements

Parameters:
extensionPoint The extension point to remove
Throws:
java.lang.IllegalArgumentException if extensionPoint is null
    public synchronized void removeExtensionPoint(Object extensionPoint) {
        if (extensionPoint == null) {
            throw new IllegalArgumentException("Cannot remove null as an ExtensionPoint");
        }
        ServiceHelper.stop(extensionPoint);
        Set<Class<?>> interfaces = getAllInterfaces(extensionPoint.getClass());
        for (Class<?> i : interfaces) {
            unregisterExtensionPoint(i);
        }
    }
    protected void unregisterExtensionPoint(Class<?> i) {
        .remove(i);
    }

    
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(clazzimplemented);
        implemented.remove(LifeCycleListener.class);
        return implemented;
    }
    private static void getAllInterfaces(Class<?> clazzSet<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(superClassimplemented);
        }
    }
    public synchronized void start() {
        // Do nothing
    }
    public synchronized void stop() {
        // Get a unique map as an extension point may exist in the map by different keys
        for (Object extp : .values()) {
            if (extp instanceof LifeCycleListener) {
                LifeCycleListener listener = (LifeCycleListener)extp;
                map.put(listenerlistener);
            }
        }
        ServiceHelper.stop(map.values());
        .clear();
    }
        return ;
    }
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