opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/config/PrefixShardConfiguration.java

   1 /*
   2  * Copyright (c) 2016 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.config;
  10
  11 import akka.cluster.ddata.ReplicatedData;
  12 import com.google.common.base.Preconditions;
  13 import com.google.common.collect.ImmutableSet;
  14 import java.io.Serializable;
  15 import java.util.Collection;
  16 import java.util.HashSet;
  17 import org.opendaylight.controller.cluster.access.concepts.MemberName;
  18 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  19
  20 /**
  21  * Configuration for prefix based shards.
  22  */
  23 public class PrefixShardConfiguration implements ReplicatedData, Serializable {
  24     private static final long serialVersionUID = 1L;
  25
  26     private final DOMDataTreeIdentifier prefix;
  27     private final String shardStrategyName;
  28     private final Collection<MemberName> shardMemberNames;
  29
  30     public PrefixShardConfiguration(final DOMDataTreeIdentifier prefix,
  31                                     final String shardStrategyName,
  32                                     final Collection<MemberName> shardMemberNames) {
  33         this.prefix = Preconditions.checkNotNull(prefix);
  34         this.shardStrategyName = Preconditions.checkNotNull(shardStrategyName);
  35         this.shardMemberNames = ImmutableSet.copyOf(shardMemberNames);
  36     }
  37
  38     public DOMDataTreeIdentifier getPrefix() {
  39         return prefix;
  40     }
  41
  42     public String getShardStrategyName() {
  43         return shardStrategyName;
  44     }
  45
  46     public Collection<MemberName> getShardMemberNames() {
  47         return shardMemberNames;
  48     }
  49
  50     @Override
  51     public String toString() {
  52         return "PrefixShardConfiguration{"
  53                 + "prefix=" + prefix
  54                 + ", shardStrategyName='"
  55                 + shardStrategyName + '\''
  56                 + ", shardMemberNames=" + shardMemberNames
  57                 + '}';
  58     }
  59
  60     public String toDataMapKey() {
  61         return "prefix=" + prefix;
  62     }
  63
  64     @Override
  65     public ReplicatedData merge(final ReplicatedData replicatedData) {
  66         if (!(replicatedData instanceof PrefixShardConfiguration)) {
  67             throw new IllegalStateException("replicatedData expected to be instance of PrefixShardConfiguration");
  68         }
  69         final PrefixShardConfiguration entry = (PrefixShardConfiguration) replicatedData;
  70         if (!entry.getPrefix().equals(prefix)) {
  71             // this should never happen since the key is the prefix
  72             // if it does just return current?
  73             return this;
  74         }
  75         final HashSet<MemberName> members = new HashSet<>(shardMemberNames);
  76         members.addAll(entry.getShardMemberNames());
  77         return new PrefixShardConfiguration(prefix, shardStrategyName, members);
  78     }
  79 }