opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/shardstrategy/ShardStrategyFactory.java

   1 /*
   2  * Copyright (c) 2014 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.shardstrategy;
  10
  11 import com.google.common.base.Optional;
  12 import com.google.common.base.Preconditions;
  13 import org.opendaylight.controller.cluster.datastore.Configuration;
  14 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  15
  16 import java.util.Map;
  17 import java.util.concurrent.ConcurrentHashMap;
  18
  19 public class ShardStrategyFactory {
  20     private static Map<String, ShardStrategy> moduleNameToStrategyMap =
  21         new ConcurrentHashMap();
  22
  23     private static final String UNKNOWN_MODULE_NAME = "unknown";
  24     private static Configuration configuration;
  25
  26
  27     public static void setConfiguration(Configuration configuration){
  28         ShardStrategyFactory.configuration = configuration;
  29         moduleNameToStrategyMap = configuration.getModuleNameToShardStrategyMap();
  30     }
  31
  32     public static ShardStrategy getStrategy(YangInstanceIdentifier path) {
  33         Preconditions.checkState(configuration != null, "configuration should not be missing");
  34         Preconditions.checkNotNull(path, "path should not be null");
  35
  36
  37         String moduleName = getModuleName(path);
  38         ShardStrategy shardStrategy = moduleNameToStrategyMap.get(moduleName);
  39         if (shardStrategy == null) {
  40             return new DefaultShardStrategy();
  41         }
  42
  43         return shardStrategy;
  44     }
  45
  46
  47     private static String getModuleName(YangInstanceIdentifier path) {
  48         String namespace = path.getPathArguments().iterator().next().getNodeType().getNamespace().toASCIIString();
  49
  50         Optional<String> optional =
  51             configuration.getModuleNameFromNameSpace(namespace);
  52
  53         if(!optional.isPresent()){
  54             return UNKNOWN_MODULE_NAME;
  55         }
  56
  57         return optional.get();
  58     }
  59 }