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 static final String ENTITY_TYPE_PREFIX = "entity.type.";
  28
  29     private final BundleContext bundleContext;
  30     private final EntityOwnerSelectionStrategyConfig config;
  31
  32     public EntityOwnerSelectionStrategyConfigReader(BundleContext bundleContext) {
  33         this.bundleContext = Preconditions.checkNotNull(bundleContext);
  34         ServiceReference<ConfigurationAdmin> configAdminServiceReference =
  35                 bundleContext.getServiceReference(ConfigurationAdmin.class);
  36         if(configAdminServiceReference == null) {
  37             LOG.warn("No ConfigurationAdmin service found");
  38             this.config = EntityOwnerSelectionStrategyConfig.newBuilder().build();
  39         } else {
  40             this.config = readConfiguration(configAdminServiceReference);
  41         }
  42     }
  43
  44     private EntityOwnerSelectionStrategyConfig readConfiguration(ServiceReference<ConfigurationAdmin> configAdminServiceReference) {
  45         EntityOwnerSelectionStrategyConfig.Builder builder = EntityOwnerSelectionStrategyConfig.newBuilder();
  46         ConfigurationAdmin configAdmin = null;
  47         try {
  48             configAdmin = bundleContext.getService(configAdminServiceReference);
  49             Dictionary<String, Object> properties = getProperties(configAdmin);
  50             if(properties != null) {
  51                 Enumeration<String> keys = properties.keys();
  52                 while (keys.hasMoreElements()) {
  53                     String key = keys.nextElement();
  54                     String strategyProps = (String) properties.get(key);
  55                     String[] strategyClassAndDelay = strategyProps.split(",");
  56                     if(key.startsWith(ENTITY_TYPE_PREFIX)) {
  57                         @SuppressWarnings("unchecked")
  58                         Class<? extends EntityOwnerSelectionStrategy> aClass
  59                         = (Class<? extends EntityOwnerSelectionStrategy>) getClass().getClassLoader().loadClass(strategyClassAndDelay[0]);
  60                         long delay = 0;
  61                         if(strategyClassAndDelay.length > 1){
  62                             delay = Long.parseLong(strategyClassAndDelay[1]);
  63                         }
  64                         String entityType = key.substring(key.lastIndexOf(".") + 1);
  65                         builder.addStrategy(entityType, aClass, delay);
  66                     } else {
  67                         LOG.debug("Ignoring non-conforming property key : {}, value : {}", key, strategyProps);
  68                     }
  69                 }
  70             } else {
  71                 LOG.error("Could not read strategy configuration file, will use default configuration");
  72             }
  73         } catch(Exception e){
  74             LOG.warn("Failed to read selection strategy configuration file. All configuration will be ignored.", e);
  75         } finally {
  76             if(configAdmin != null) {
  77                 try {
  78                     bundleContext.ungetService(configAdminServiceReference);
  79                 } catch (Exception e) {
  80                     LOG.debug("Error from ungetService", e);
  81                 }
  82             }
  83         }
  84
  85         return builder.build();
  86     }
  87
  88     @Nullable
  89     private static Dictionary<String, Object> getProperties(ConfigurationAdmin configAdmin) throws IOException {
  90         Configuration config = configAdmin.getConfiguration(CONFIG_ID);
  91         return config != null ? config.getProperties() : null;
  92     }
  93
  94     public EntityOwnerSelectionStrategyConfig getConfig() {
  95         return config;
  96     }
  97 }