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 package org.opendaylight.controller.cluster.datastore.shardstrategy;
   9
  10 import static com.google.common.base.Preconditions.checkState;
  11 import static java.util.Objects.requireNonNull;
  12
  13 import org.opendaylight.controller.cluster.datastore.config.Configuration;
  14 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
  15 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  16 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  17
  18 public class ShardStrategyFactory {
  19     private static final String UNKNOWN_MODULE_NAME = "unknown";
  20
  21     private final Configuration configuration;
  22     private final LogicalDatastoreType logicalStoreType;
  23
  24     public ShardStrategyFactory(final Configuration configuration, final LogicalDatastoreType logicalStoreType) {
  25         checkState(configuration != null, "configuration should not be missing");
  26         this.configuration = configuration;
  27         this.logicalStoreType = requireNonNull(logicalStoreType);
  28     }
  29
  30     public ShardStrategy getStrategy(final YangInstanceIdentifier path) {
  31         // try with the legacy module based shard mapping
  32         final String moduleName = getModuleName(requireNonNull(path, "path should not be null"));
  33         final ShardStrategy shardStrategy = configuration.getStrategyForModule(moduleName);
  34         if (shardStrategy == null) {
  35             // retry with prefix based sharding
  36             final ShardStrategy strategyForPrefix =
  37                     configuration.getStrategyForPrefix(new DOMDataTreeIdentifier(logicalStoreType, path));
  38             if (strategyForPrefix == null) {
  39                 return DefaultShardStrategy.getInstance();
  40             }
  41             return strategyForPrefix;
  42         }
  43
  44         return shardStrategy;
  45     }
  46
  47     public static ShardStrategy newShardStrategyInstance(final String moduleName, final String strategyName,
  48             final Configuration configuration) {
  49         if (ModuleShardStrategy.NAME.equals(strategyName)) {
  50             return new ModuleShardStrategy(moduleName, configuration);
  51         }
  52
  53         return DefaultShardStrategy.getInstance();
  54     }
  55
  56     private String getModuleName(final YangInstanceIdentifier path) {
  57         if (path.isEmpty()) {
  58             return UNKNOWN_MODULE_NAME;
  59         }
  60
  61         String namespace = path.getPathArguments().get(0).getNodeType().getNamespace().toString();
  62         String moduleName = configuration.getModuleNameFromNameSpace(namespace);
  63         return moduleName != null ? moduleName : UNKNOWN_MODULE_NAME;
  64     }
  65 }