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.util.Map;
  13 import java.util.Map.Entry;
  14 import org.opendaylight.controller.cluster.datastore.entityownership.selectionstrategy.EntityOwnerSelectionStrategyConfig.Builder;
  15 import org.slf4j.Logger;
  16 import org.slf4j.LoggerFactory;
  17
  18 /**
  19  * Reads the entity owner selection strategy config.
  20  *
  21  */
  22 public final class EntityOwnerSelectionStrategyConfigReader {
  23
  24     private static final Logger LOG = LoggerFactory.getLogger(EntityOwnerSelectionStrategyConfigReader.class);
  25     private static final String ENTITY_TYPE_PREFIX = "entity.type.";
  26
  27     private EntityOwnerSelectionStrategyConfigReader() {
  28         // Hidden on purpose
  29     }
  30
  31     @SuppressWarnings("checkstyle:IllegalCatch")
  32     public static EntityOwnerSelectionStrategyConfig loadStrategyWithConfig(final Map<Object, Object> props) {
  33         final EntityOwnerSelectionStrategyConfig.Builder builder = EntityOwnerSelectionStrategyConfig.newBuilder();
  34
  35         if (props != null && !props.isEmpty()) {
  36             parseConfiguration(builder, props);
  37         } else {
  38             if (props == null) {
  39                 LOG.debug("Could not read strategy configuration file, will use default configuration.");
  40             } else {
  41                 LOG.debug("Configuration file is empty, will use default configuration.");
  42             }
  43         }
  44         return builder.build();
  45     }
  46
  47     private static EntityOwnerSelectionStrategyConfig parseConfiguration(final Builder builder,
  48             final Map<Object, Object> properties) {
  49
  50         for (final Entry<Object, Object> entry : properties.entrySet()) {
  51             final String key = (String) entry.getKey();
  52             if (!key.startsWith(ENTITY_TYPE_PREFIX)) {
  53                 LOG.debug("Ignoring non-conforming property key : {}", key);
  54                 continue;
  55             }
  56
  57             final String[] strategyClassAndDelay = ((String) properties.get(key)).split(",");
  58             final Class<? extends EntityOwnerSelectionStrategy> aClass = loadClass(strategyClassAndDelay[0]);
  59
  60             final long delay;
  61             if (strategyClassAndDelay.length > 1) {
  62                 delay = Long.parseLong(strategyClassAndDelay[1]);
  63             } else {
  64                 delay = 0;
  65             }
  66
  67             final String entityType = key.substring(key.lastIndexOf(".") + 1);
  68             builder.addStrategy(entityType, aClass, delay);
  69             LOG.debug("Entity Type '{}' using strategy {} delay {}", entityType, aClass, delay);
  70         }
  71
  72         return builder.build();
  73     }
  74
  75     @SuppressWarnings("unchecked")
  76     private static Class<? extends EntityOwnerSelectionStrategy> loadClass(final String strategyClassAndDelay) {
  77         final Class<?> clazz;
  78         try {
  79             clazz = EntityOwnerSelectionStrategyConfigReader.class.getClassLoader().loadClass(strategyClassAndDelay);
  80         } catch (final ClassNotFoundException e) {
  81             throw new IllegalArgumentException("Failed to load strategy " + strategyClassAndDelay, e);
  82         }
  83
  84         Preconditions.checkArgument(EntityOwnerSelectionStrategy.class.isAssignableFrom(clazz),
  85             "Selected implementation %s must implement EntityOwnerSelectionStrategy, clazz");
  86
  87         return (Class<? extends EntityOwnerSelectionStrategy>) clazz;
  88     }
  89 }