| /* |
| * Licensed 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.karaf.cellar.core.discovery; |
| |
| import java.io.IOException; |
| import java.util.Dictionary; |
| import java.util.Hashtable; |
| import java.util.LinkedHashSet; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| import org.apache.karaf.cellar.core.utils.CellarUtils; |
| import org.osgi.service.cm.Configuration; |
| import org.osgi.service.cm.ConfigurationAdmin; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class DiscoveryTask implements Runnable { |
| |
| private static final transient Logger LOGGER = LoggerFactory.getLogger(DiscoveryTask.class); |
| |
| private List<DiscoveryService> discoveryServices; |
| private ConfigurationAdmin configurationAdmin; |
| |
| private ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1); |
| |
| public void init() { |
| LOGGER.debug("CELLAR DISCOVERY: a new Task initialized"); |
| scheduler.scheduleWithFixedDelay(this, 10, 10, TimeUnit.SECONDS); |
| } |
| |
| public void destroy() { |
| LOGGER.debug("CELLAR DISCOVERY: task is being destroyed"); |
| scheduler.shutdown(); |
| } |
| |
| @Override |
| public void run() { |
| LOGGER.trace("CELLAR DISCOVERY: starting the discovery task"); |
| |
| if (configurationAdmin != null) { |
| Set<String> members = new LinkedHashSet<String>(); |
| if (discoveryServices != null && !discoveryServices.isEmpty()) { |
| for (DiscoveryService service : discoveryServices) { |
| service.refresh(); |
| Set<String> discovered = service.discoverMembers(); |
| members.addAll(discovered); |
| LOGGER.trace("CELLAR DISCOVERY: service {} found members {}", service, discovered); |
| } |
| try { |
| LOGGER.trace("CELLAR DISCOVERY: retrieving configuration for PID={}", Discovery.PID); |
| Configuration configuration = configurationAdmin.getConfiguration(Discovery.PID, null); |
| Dictionary properties = configuration.getProperties(); |
| if (properties == null) { |
| // this is a new configuration ... |
| LOGGER.trace("CELLAR DISCOVERY: configuration is new"); |
| properties = new Hashtable(); |
| } |
| String newMemberText = CellarUtils.createStringFromSet(members, true); |
| String memberText = (String) properties.get(Discovery.DISCOVERED_MEMBERS_PROPERTY_NAME); |
| if (newMemberText != null && newMemberText.length() > 0 && !newMemberText.equals(memberText)) { |
| properties.put(Discovery.DISCOVERED_MEMBERS_PROPERTY_NAME, newMemberText); |
| LOGGER.trace("CELLAR DISCOVERY: adding a new member {} to configuration and updating it", newMemberText); |
| configuration.update(properties); |
| } else { |
| LOGGER.trace("CELLAR DISCOVERY: found a valid member in the configuration will skip"); |
| } |
| } catch (IOException e) { |
| LOGGER.error("CELLAR DISCOVERY: failed to update member list", e); |
| } |
| } else { |
| LOGGER.trace("CELLAR DISCOVERY: no discovery services found ... "); |
| } |
| } else { |
| LOGGER.trace("CELLAR DISCOVERY: no config admin found"); |
| } |
| } |
| |
| public List<DiscoveryService> getDiscoveryServices() { |
| return discoveryServices; |
| } |
| |
| public void setDiscoveryServices(List<DiscoveryService> discoveryServices) { |
| this.discoveryServices = discoveryServices; |
| } |
| |
| public ConfigurationAdmin getConfigurationAdmin() { |
| return configurationAdmin; |
| } |
| |
| public void setConfigurationAdmin(ConfigurationAdmin configurationAdmin) { |
| this.configurationAdmin = configurationAdmin; |
| } |
| |
| } |