| /* |
| * 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.unomi.services.services; |
| |
| import org.apache.unomi.api.services.ConfigSharingService; |
| import org.osgi.framework.*; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| /** |
| * An implementation of the ConfigSharingService that supports listeners that will be called when a property is added, |
| * updated or removed. The properties are stored in a ConcurrentHashMap so access should be thread-safe. |
| */ |
| public class ConfigSharingServiceImpl implements ConfigSharingService, SynchronousBundleListener { |
| |
| private static final Logger logger = LoggerFactory.getLogger(ConfigSharingServiceImpl.class); |
| |
| private BundleContext bundleContext; |
| private Map<String,Object> configProperties = new ConcurrentHashMap<String,Object>(); |
| |
| public void setBundleContext(BundleContext bundleContext) { |
| this.bundleContext = bundleContext; |
| } |
| |
| public void setConfigProperties(Map<String, Object> configProperties) { |
| this.configProperties = configProperties; |
| } |
| |
| @Override |
| public Object getProperty(String name) { |
| return configProperties.get(name); |
| } |
| |
| @Override |
| public Object setProperty(String name, Object newValue) { |
| boolean existed = false; |
| if (configProperties.containsKey(name)) { |
| existed = true; |
| } |
| Object oldValue = configProperties.put(name, newValue); |
| if (existed) { |
| firePropertyUpdatedEvent(name, oldValue, newValue); |
| } else { |
| firePropertyAddedEvent(name, newValue); |
| } |
| return oldValue; |
| } |
| |
| @Override |
| public boolean hasProperty(String name) { |
| return configProperties.containsKey(name); |
| } |
| |
| @Override |
| public Object removeProperty(String name) { |
| boolean existed = false; |
| if (configProperties.containsKey(name)) { |
| existed = true; |
| } |
| Object oldValue = configProperties.remove(name); |
| if (existed) { |
| firePropertyRemovedEvent(name, oldValue); |
| } |
| return oldValue; |
| } |
| |
| @Override |
| public Set<String> getPropertyNames() { |
| return configProperties.keySet(); |
| } |
| |
| public void preDestroy() throws Exception { |
| bundleContext.removeBundleListener(this); |
| logger.info("Config sharing service for Service is shutdown."); |
| } |
| |
| private void processBundleStartup(BundleContext bundleContext) { |
| if (bundleContext == null) { |
| return; |
| } |
| } |
| |
| @Override |
| public void bundleChanged(BundleEvent bundleEvent) { |
| |
| } |
| |
| private void firePropertyAddedEvent(String name, Object newValue) { |
| fireConfigChangeEvent(new ConfigChangeEvent(ConfigChangeEvent.ConfigChangeEventType.ADDED, name, null, newValue)); |
| } |
| |
| private void firePropertyUpdatedEvent(String name, Object oldValue, Object newValue) { |
| fireConfigChangeEvent(new ConfigChangeEvent(ConfigChangeEvent.ConfigChangeEventType.UPDATED, name, oldValue, newValue)); |
| } |
| |
| private void firePropertyRemovedEvent(String name, Object oldValue) { |
| fireConfigChangeEvent(new ConfigChangeEvent(ConfigChangeEvent.ConfigChangeEventType.REMOVED, name, oldValue, null)); |
| } |
| |
| private void fireConfigChangeEvent(ConfigChangeEvent configChangeEvent) { |
| List<ConfigChangeListener> listeners = getListeners(); |
| for (ConfigChangeListener configChangeListener : listeners) { |
| configChangeListener.configChanged(configChangeEvent); |
| } |
| } |
| |
| /** |
| * This method is called a lot because this list may change at any time as listeners may come and go in OSGi |
| * @return a list of ConfigChangeListeners that will be used to listen to property changes |
| */ |
| private List<ConfigChangeListener> getListeners() { |
| List<ConfigChangeListener> listeners = new ArrayList<>(); |
| try { |
| ServiceReference<?>[] allListenerReferences = bundleContext.getAllServiceReferences(ConfigChangeListener.class.getName(), null); |
| if (allListenerReferences == null) { |
| return listeners; |
| } |
| for (ServiceReference<?> listenerReference : allListenerReferences) { |
| ConfigChangeListener configChangeListener = (ConfigChangeListener) bundleContext.getService(listenerReference); |
| if (configChangeListener != null) { |
| listeners.add(configChangeListener); |
| } |
| } |
| } catch (InvalidSyntaxException e) { |
| e.printStackTrace(); |
| return listeners; |
| } |
| return listeners; |
| } |
| |
| } |