| /* |
| * 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.sling.resource.presence.internal; |
| |
| import java.util.Dictionary; |
| import java.util.Hashtable; |
| |
| import org.apache.sling.api.resource.LoginException; |
| import org.apache.sling.api.resource.Resource; |
| import org.apache.sling.api.resource.ResourceResolver; |
| import org.apache.sling.api.resource.ResourceResolverFactory; |
| import org.apache.sling.api.resource.observation.ResourceChange; |
| import org.apache.sling.api.resource.observation.ResourceChange.ChangeType; |
| import org.apache.sling.api.resource.observation.ResourceChangeListener; |
| import org.apache.sling.resource.presence.ResourcePresence; |
| import org.apache.sling.serviceusermapping.ServiceUserMapped; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.ServiceRegistration; |
| import org.osgi.service.component.annotations.Activate; |
| import org.osgi.service.component.annotations.Component; |
| import org.osgi.service.component.annotations.ConfigurationPolicy; |
| import org.osgi.service.component.annotations.Deactivate; |
| import org.osgi.service.component.annotations.Reference; |
| import org.osgi.service.metatype.annotations.Designate; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| @Component( |
| configurationPolicy = ConfigurationPolicy.REQUIRE |
| ) |
| @Designate( |
| ocd = ResourcePresenterConfiguration.class, |
| factory = true |
| ) |
| public class ResourcePresenter { |
| |
| private String path; |
| |
| private BundleContext bundleContext; |
| |
| private ServiceRegistration<ResourcePresence> presenceRegistration; |
| |
| private ServiceRegistration<ResourceChangeListener> listenerRegistration; |
| |
| @Reference |
| private ResourceResolverFactory resourceResolverFactory; |
| |
| @Reference |
| private ServiceUserMapped serviceUserMapped; |
| |
| private final Logger logger = LoggerFactory.getLogger(ResourcePresenter.class); |
| |
| @Activate |
| public void activate(final ResourcePresenterConfiguration configuration, final BundleContext bundleContext) { |
| logger.info("activating resource presenter for {}", configuration.path()); |
| path = configuration.path(); |
| this.bundleContext = bundleContext; |
| try (final ResourceResolver resourceResolver = getServiceResourceResolver()) { |
| final Resource resource = resourceResolver.getResource(path); |
| if (resource != null) { |
| registerResourcePresence(); |
| } |
| registerResourceChangeListener(); |
| } catch (LoginException e) { |
| logger.error(e.getMessage(), e); |
| } |
| } |
| |
| @Deactivate |
| public void deactivate() { |
| logger.info("deactivating resource presenter for {}", path); |
| unregisterResourceChangeListener(); |
| unregisterResourcePresence(); |
| bundleContext = null; |
| } |
| |
| private ResourcePresence resourcePresence() { |
| return () -> path; |
| } |
| |
| private ResourceChangeListener resourceChangeListener() { |
| return resourceChanges -> { |
| for (final ResourceChange resourceChange : resourceChanges) { |
| if (path.equals(resourceChange.getPath())) { |
| final ChangeType type = resourceChange.getType(); |
| logger.info("change for {} observed: {}", path, type); |
| if (type == ChangeType.ADDED) { |
| unregisterResourcePresence(); |
| registerResourcePresence(); |
| } else if (type == ChangeType.REMOVED) { |
| unregisterResourcePresence(); |
| } |
| } |
| } |
| }; |
| } |
| |
| private void registerResourcePresence() { |
| final Dictionary<String, Object> properties = new Hashtable<>(); |
| properties.put("path", path); |
| presenceRegistration = bundleContext.registerService(ResourcePresence.class, resourcePresence(), properties); |
| logger.info("resource presence for {} registered", path); |
| } |
| |
| private void unregisterResourcePresence() { |
| if (presenceRegistration != null) { |
| presenceRegistration.unregister(); |
| presenceRegistration = null; |
| logger.info("resource presence for {} unregistered", path); |
| } |
| } |
| |
| private void registerResourceChangeListener() { |
| final Dictionary<String, Object> properties = new Hashtable<>(); |
| properties.put(ResourceChangeListener.PATHS, path); |
| listenerRegistration = bundleContext.registerService(ResourceChangeListener.class, resourceChangeListener(), properties); |
| logger.info("resource change listener for {} registered", path); |
| } |
| |
| private void unregisterResourceChangeListener() { |
| if (listenerRegistration != null) { |
| listenerRegistration.unregister(); |
| listenerRegistration = null; |
| logger.info("resource change listener for {} unregistered", path); |
| } |
| } |
| |
| private ResourceResolver getServiceResourceResolver() throws LoginException { |
| return resourceResolverFactory.getServiceResourceResolver(null); |
| } |
| |
| } |