| /* |
| * 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.dm.runtime; |
| |
| import java.util.ArrayList; |
| import java.util.Dictionary; |
| import java.util.List; |
| |
| import org.apache.felix.dm.Dependency; |
| import org.apache.felix.dm.DependencyActivation; |
| import org.apache.felix.dm.DependencyService; |
| |
| /** |
| * This is a custom DependencyManager Dependency, allowing to take control of when the dependency |
| * is available or not. It's used in the context of the LifecycleController class, in order to |
| * activate/deactivate a Component on demand. |
| * |
| * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a> |
| */ |
| public class ToggleServiceDependency implements Dependency, DependencyActivation |
| { |
| private final List<Object> m_services = new ArrayList<Object>(); |
| private volatile boolean m_isAvailable; |
| private volatile boolean m_stopped; |
| |
| public ToggleServiceDependency() |
| { |
| } |
| |
| public ToggleServiceDependency(boolean isAvailable) |
| { |
| m_isAvailable = isAvailable; |
| } |
| |
| public void setAvailable(boolean isAvailable) |
| { |
| synchronized (this) |
| { |
| if (m_stopped) |
| { |
| return; |
| } |
| boolean changed = m_isAvailable != isAvailable; |
| m_isAvailable = isAvailable; |
| |
| if (! changed) { |
| return; |
| } |
| } |
| |
| // invoked on every change |
| if (m_isAvailable) |
| { |
| Object[] services = m_services.toArray(); |
| for (int i = 0; i < services.length; i++) |
| { |
| DependencyService ds = (DependencyService) services[i]; |
| ds.dependencyAvailable(this); |
| if (!isRequired()) |
| { |
| invokeAdded(ds); |
| } |
| } |
| } |
| else |
| { |
| Object[] services = m_services.toArray(); |
| for (int i = 0; i < services.length; i++) |
| { |
| DependencyService ds = (DependencyService) services[i]; |
| ds.dependencyUnavailable(this); |
| if (!isRequired()) |
| { |
| invokeRemoved(ds); |
| } |
| } |
| } |
| } |
| |
| public Dependency createCopy() |
| { |
| return new ToggleServiceDependency(m_isAvailable); |
| } |
| |
| public Object getAutoConfigInstance() |
| { |
| return "" + m_isAvailable; |
| } |
| |
| public String getAutoConfigName() |
| { |
| return null; |
| } |
| |
| public Class<?> getAutoConfigType() |
| { |
| return String.class; |
| } |
| |
| @SuppressWarnings("unchecked") |
| public Dictionary getProperties() |
| { |
| return null; |
| } |
| |
| public void invokeAdded(DependencyService service) |
| { |
| } |
| |
| public void invokeRemoved(DependencyService service) |
| { |
| } |
| |
| public void invoke(DependencyService dependencyService, String name) |
| { |
| } |
| |
| public boolean isAutoConfig() |
| { |
| return false; |
| } |
| |
| public boolean isAvailable() |
| { |
| return m_isAvailable; |
| } |
| |
| public boolean isInstanceBound() |
| { |
| return true; |
| } |
| |
| public boolean isPropagated() |
| { |
| return false; |
| } |
| |
| public boolean isRequired() |
| { |
| return true; |
| } |
| |
| public void start(DependencyService service) |
| { |
| synchronized (this) |
| { |
| m_services.add(service); |
| m_stopped = false; |
| } |
| } |
| |
| public void stop(DependencyService service) |
| { |
| synchronized (this) |
| { |
| m_services.remove(service); |
| m_stopped = true; |
| } |
| } |
| } |