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/*
* Copyright 2015 Open Networking Laboratory
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.onosproject.store.consistent.impl;
import static com.google.common.base.Preconditions.checkState;
import java.util.List;
import com.google.common.base.Charsets;
import com.google.common.collect.ImmutableList;
import com.google.common.hash.Hashing;
/**
* Partitioner for mapping map entries to individual database partitions.
* <p>
* By default a md5 hash of the hash key (key or map name) is used to pick a
* partition.
*/
public abstract class DatabasePartitioner implements Partitioner<String> {
// Database partitions sorted by their partition name.
protected final List<Database> partitions;
public DatabasePartitioner(List<Database> partitions) {
checkState(partitions != null && !partitions.isEmpty(), "Partitions cannot be null or empty");
this.partitions = ImmutableList.copyOf(partitions);
}
protected int hash(String key) {
return Math.abs(Hashing.md5().newHasher().putBytes(key.getBytes(Charsets.UTF_8)).hash().asInt());
}
}
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