| /* |
| * 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.felix.scr.impl.helper; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.ServiceObjects; |
| import org.osgi.framework.ServiceReference; |
| import org.osgi.service.component.ComponentServiceObjects; |
| |
| /** |
| * Utility class for handling references using a ComponentServiceObjects |
| * to get services. |
| */ |
| public class ComponentServiceObjectsHelper |
| { |
| private final BundleContext bundleContext; |
| |
| private final ConcurrentMap<ServiceReference<?>, ComponentServiceObjectsImpl> services = new ConcurrentHashMap<ServiceReference<?>, ComponentServiceObjectsImpl>(); |
| |
| private final List<ComponentServiceObjectsImpl> closedServices = new ArrayList<ComponentServiceObjectsImpl>(); |
| |
| private final ConcurrentMap<ServiceReference<?>, Object> prototypeInstances = new ConcurrentHashMap<ServiceReference<?>, Object>(); |
| |
| public ComponentServiceObjectsHelper(final BundleContext bundleContext) |
| { |
| this.bundleContext = bundleContext; |
| } |
| |
| public void cleanup() |
| { |
| Collection<ComponentServiceObjectsImpl> csos = services.values(); |
| services.clear(); |
| for(final ComponentServiceObjectsImpl cso : csos) |
| { |
| cso.deactivate(); |
| } |
| synchronized ( this.closedServices ) |
| { |
| csos = new ArrayList<ComponentServiceObjectsImpl>(this.closedServices); |
| this.closedServices.clear(); |
| } |
| for(final ComponentServiceObjectsImpl cso : csos) |
| { |
| cso.deactivate(); |
| } |
| prototypeInstances.clear(); |
| } |
| |
| public ComponentServiceObjects getServiceObjects(final ServiceReference<?> ref) |
| { |
| ComponentServiceObjectsImpl cso = this.services.get(ref); |
| if ( cso == null ) |
| { |
| final ServiceObjects serviceObjects = this.bundleContext.getServiceObjects(ref); |
| if ( serviceObjects != null ) |
| { |
| cso = new ComponentServiceObjectsImpl(serviceObjects); |
| final ComponentServiceObjectsImpl oldCSO = this.services.putIfAbsent(ref, cso); |
| if ( oldCSO != null ) |
| { |
| cso = oldCSO; |
| } |
| } |
| } |
| return cso; |
| } |
| |
| public void closeServiceObjects(final ServiceReference<?> ref) { |
| ComponentServiceObjectsImpl cso = this.services.remove(ref); |
| if ( cso != null ) |
| { |
| synchronized ( closedServices ) |
| { |
| closedServices.add(cso); |
| } |
| cso.close(); |
| } |
| } |
| |
| public <T> T getPrototypeRefInstance(final ServiceReference<T> ref) |
| { |
| T service = (T) prototypeInstances.get(ref); |
| if ( service == null ) |
| { |
| service = (T) getServiceObjects(ref).getService(); |
| T oldService = (T)prototypeInstances.putIfAbsent(ref, service); |
| if ( oldService != null ) |
| { |
| // another thread created the instance already |
| getServiceObjects(ref).ungetService(service); |
| service = oldService; |
| } |
| } |
| return service; |
| } |
| |
| private static final class ComponentServiceObjectsImpl implements ComponentServiceObjects |
| { |
| private final List<Object> instances = new ArrayList<Object>(); |
| |
| private volatile ServiceObjects serviceObjects; |
| |
| private volatile boolean deactivated = false; |
| |
| public ComponentServiceObjectsImpl(final ServiceObjects so) |
| { |
| this.serviceObjects = so; |
| } |
| |
| public void deactivate() |
| { |
| this.deactivated = true; |
| close(); |
| } |
| |
| /** |
| * Close this instance and unget all services. |
| */ |
| public void close() |
| { |
| final ServiceObjects so = this.serviceObjects; |
| this.serviceObjects = null; |
| if ( so != null ) |
| { |
| final List<Object> localInstances = new ArrayList<Object>(); |
| synchronized ( this.instances ) |
| { |
| localInstances.addAll(this.instances); |
| this.instances.clear(); |
| } |
| for(final Object obj : localInstances) |
| { |
| try |
| { |
| so.ungetService(obj); |
| } |
| catch ( final IllegalStateException ise ) |
| { |
| // ignore (this happens if the bundle is not valid anymore) |
| } |
| catch ( final IllegalArgumentException iae ) |
| { |
| // ignore (this happens if the service has not been returned by the service objects) |
| } |
| } |
| } |
| } |
| |
| public Object getService() |
| { |
| if ( this.deactivated ) |
| { |
| throw new IllegalStateException(); |
| } |
| final ServiceObjects so = this.serviceObjects; |
| Object service = null; |
| if ( so != null ) |
| { |
| service = so.getService(); |
| if ( service != null ) |
| { |
| synchronized ( this.instances ) |
| { |
| this.instances.add(service); |
| } |
| } |
| } |
| return service; |
| } |
| |
| public void ungetService(final Object service) |
| { |
| if ( this.deactivated ) |
| { |
| throw new IllegalStateException(); |
| } |
| final ServiceObjects so = this.serviceObjects; |
| if ( so != null ) |
| { |
| boolean remove; |
| synchronized ( instances ) |
| { |
| remove = instances.remove(service); |
| } |
| if ( remove ) { |
| so.ungetService(service); |
| } |
| } |
| } |
| |
| public ServiceReference<?> getServiceReference() |
| { |
| final ServiceObjects so = this.serviceObjects; |
| if ( so != null ) |
| { |
| return so.getServiceReference(); |
| } |
| return null; |
| } |
| |
| @Override |
| public String toString() { |
| return "ComponentServiceObjectsImpl [instances=" + instances + ", serviceObjects=" + serviceObjects |
| + ", deactivated=" + deactivated + ", hashCode=" + this.hashCode() + "]"; |
| } |
| |
| } |
| } |