opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/entityownership/selectionstrategy/EntityOwnerSelectionStrategyConfigReader.java

   1 /*
   2  * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.controller.cluster.datastore.entityownership.selectionstrategy;
  10
  11 import com.google.common.base.Preconditions;
  12 import java.io.IOException;
  13 import java.util.Dictionary;
  14 import java.util.Enumeration;
  15 import javax.annotation.Nullable;
  16 import org.osgi.framework.BundleContext;
  17 import org.osgi.framework.ServiceReference;
  18 import org.osgi.service.cm.Configuration;
  19 import org.osgi.service.cm.ConfigurationAdmin;
  20 import org.slf4j.Logger;
  21 import org.slf4j.LoggerFactory;
  22
  23 public class EntityOwnerSelectionStrategyConfigReader {
  24     public static final String CONFIG_ID = "org.opendaylight.controller.cluster.entity-owner-selection-strategies";
  25
  26     private static final Logger LOG = LoggerFactory.getLogger(EntityOwnerSelectionStrategyConfigReader.class);
  27     private final BundleContext bundleContext;
  28     private final EntityOwnerSelectionStrategyConfig config;
  29
  30     public EntityOwnerSelectionStrategyConfigReader(BundleContext bundleContext) {
  31         this.bundleContext = Preconditions.checkNotNull(bundleContext);
  32         ServiceReference<ConfigurationAdmin> configAdminServiceReference =
  33                 bundleContext.getServiceReference(ConfigurationAdmin.class);
  34         if(configAdminServiceReference == null) {
  35             LOG.warn("No ConfigurationAdmin service found");
  36             this.config = EntityOwnerSelectionStrategyConfig.newBuilder().build();
  37         } else {
  38             this.config = readConfiguration(configAdminServiceReference);
  39         }
  40     }
  41
  42     private EntityOwnerSelectionStrategyConfig readConfiguration(ServiceReference<ConfigurationAdmin> configAdminServiceReference) {
  43         EntityOwnerSelectionStrategyConfig.Builder builder = EntityOwnerSelectionStrategyConfig.newBuilder();
  44         ConfigurationAdmin configAdmin = null;
  45         try {
  46             configAdmin = bundleContext.getService(configAdminServiceReference);
  47             Dictionary<String, Object> properties = getProperties(configAdmin);
  48             if(properties != null) {
  49                 Enumeration<String> keys = properties.keys();
  50                 while (keys.hasMoreElements()) {
  51                     String key = keys.nextElement();
  52                     String strategyProps = (String) properties.get(key);
  53                     String[] strategyClassAndDelay = strategyProps.split(",");
  54                     if(strategyClassAndDelay.length >= 1) {
  55                         @SuppressWarnings("unchecked")
  56                         Class<? extends EntityOwnerSelectionStrategy> aClass
  57                         = (Class<? extends EntityOwnerSelectionStrategy>) getClass().getClassLoader().loadClass(strategyClassAndDelay[0]);
  58                         long delay = 0;
  59                         if(strategyClassAndDelay.length > 1){
  60                             delay = Long.parseLong(strategyClassAndDelay[1]);
  61                         }
  62                         builder.addStrategy(key, aClass, delay);
  63                     }
  64                 }
  65             }
  66         } catch(Exception e){
  67             LOG.warn("Failed to read selection strategy configuration file. All configuration will be ignored.", e);
  68         } finally {
  69             if(configAdmin != null) {
  70                 try {
  71                     bundleContext.ungetService(configAdminServiceReference);
  72                 } catch (Exception e) {
  73                     LOG.debug("Error from ungetService", e);
  74                 }
  75             }
  76         }
  77
  78         return builder.build();
  79     }
  80
  81     @Nullable
  82     private static Dictionary<String, Object> getProperties(ConfigurationAdmin configAdmin) throws IOException {
  83         Configuration config = configAdmin.getConfiguration(CONFIG_ID);
  84         return config != null ? config.getProperties() : null;
  85     }
  86
  87     public EntityOwnerSelectionStrategyConfig getConfig() {
  88         return config;
  89     }
  90 }