Madan Jampani | 94c2353 | 2015-02-05 17:40:01 -0800 | [diff] [blame] | 1 | package org.onosproject.store.consistent.impl; |
| 2 | |
| 3 | import java.util.Collections; |
| 4 | import java.util.List; |
| 5 | import java.util.Map; |
| 6 | |
| 7 | import com.google.common.collect.ImmutableMap; |
| 8 | import com.google.common.collect.Lists; |
| 9 | |
| 10 | /** |
| 11 | * A simple Partitioner that uses the key hashCode to map |
| 12 | * key to a partition. |
| 13 | * |
| 14 | * @param <K> key type. |
| 15 | */ |
| 16 | public class SimpleKeyHashPartitioner<K> implements Partitioner<K> { |
| 17 | |
| 18 | private final Map<String, Database> partitionMap; |
| 19 | private final List<String> sortedPartitionNames; |
| 20 | |
| 21 | public SimpleKeyHashPartitioner(Map<String, Database> partitionMap) { |
| 22 | this.partitionMap = ImmutableMap.copyOf(partitionMap); |
| 23 | sortedPartitionNames = Lists.newArrayList(this.partitionMap.keySet()); |
| 24 | Collections.sort(sortedPartitionNames); |
| 25 | } |
| 26 | |
| 27 | @Override |
| 28 | public Database getPartition(String tableName, K key) { |
| 29 | return partitionMap.get(sortedPartitionNames.get(Math.abs(key.hashCode()) % partitionMap.size())); |
| 30 | } |
| 31 | } |