opendaylight/md-sal/sal-distributed-eos/src/main/java/org/opendaylight/controller/cluster/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 package org.opendaylight.controller.cluster.entityownership.selectionstrategy;
   9
  10 import com.google.common.base.Preconditions;
  11 import java.util.Map;
  12 import java.util.Map.Entry;
  13 import org.opendaylight.controller.cluster.entityownership.selectionstrategy.EntityOwnerSelectionStrategyConfig.Builder;
  14 import org.slf4j.Logger;
  15 import org.slf4j.LoggerFactory;
  16
  17 /**
  18  * Reads the entity owner selection strategy config.
  19  *
  20  */
  21 public final class EntityOwnerSelectionStrategyConfigReader {
  22
  23     private static final Logger LOG = LoggerFactory.getLogger(EntityOwnerSelectionStrategyConfigReader.class);
  24     private static final String ENTITY_TYPE_PREFIX = "entity.type.";
  25
  26     private EntityOwnerSelectionStrategyConfigReader() {
  27         // Hidden on purpose
  28     }
  29
  30     @SuppressWarnings("checkstyle:IllegalCatch")
  31     public static EntityOwnerSelectionStrategyConfig loadStrategyWithConfig(final Map<Object, Object> props) {
  32         final EntityOwnerSelectionStrategyConfig.Builder builder = EntityOwnerSelectionStrategyConfig.newBuilder();
  33
  34         if (props != null && !props.isEmpty()) {
  35             parseConfiguration(builder, props);
  36         } else {
  37             if (props == null) {
  38                 LOG.debug("Could not read strategy configuration file, will use default configuration.");
  39             } else {
  40                 LOG.debug("Configuration file is empty, will use default configuration.");
  41             }
  42         }
  43         return builder.build();
  44     }
  45
  46     private static EntityOwnerSelectionStrategyConfig parseConfiguration(final Builder builder,
  47             final Map<Object, Object> properties) {
  48
  49         for (final Entry<Object, Object> entry : properties.entrySet()) {
  50             final String key = (String) entry.getKey();
  51             if (!key.startsWith(ENTITY_TYPE_PREFIX)) {
  52                 LOG.debug("Ignoring non-conforming property key : {}", key);
  53                 continue;
  54             }
  55
  56             final String[] strategyClassAndDelay = ((String) properties.get(key)).split(",");
  57             final Class<? extends EntityOwnerSelectionStrategy> aClass = loadClass(strategyClassAndDelay[0]);
  58
  59             final long delay;
  60             if (strategyClassAndDelay.length > 1) {
  61                 delay = Long.parseLong(strategyClassAndDelay[1]);
  62             } else {
  63                 delay = 0;
  64             }
  65
  66             final String entityType = key.substring(key.lastIndexOf(".") + 1);
  67             builder.addStrategy(entityType, aClass, delay);
  68             LOG.debug("Entity Type '{}' using strategy {} delay {}", entityType, aClass, delay);
  69         }
  70
  71         return builder.build();
  72     }
  73
  74     @SuppressWarnings("unchecked")
  75     private static Class<? extends EntityOwnerSelectionStrategy> loadClass(final String strategyClassAndDelay) {
  76         final Class<?> clazz;
  77         try {
  78             clazz = EntityOwnerSelectionStrategyConfigReader.class.getClassLoader().loadClass(strategyClassAndDelay);
  79         } catch (final ClassNotFoundException e) {
  80             throw new IllegalArgumentException("Failed to load strategy " + strategyClassAndDelay, e);
  81         }
  82
  83         Preconditions.checkArgument(EntityOwnerSelectionStrategy.class.isAssignableFrom(clazz),
  84             "Selected implementation %s must implement EntityOwnerSelectionStrategy, clazz");
  85
  86         return (Class<? extends EntityOwnerSelectionStrategy>) clazz;
  87     }
  88 }