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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 com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Maps;
import org.onosproject.store.cluster.impl.NodeInfo;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* Partitioned database configuration.
*/
public class DatabaseDefinition {
private Map<String, Set<NodeInfo>> partitions;
private Set<NodeInfo> nodes;
/**
* Creates a new DatabaseDefinition.
*
* @param partitions partition map
* @param nodes set of nodes
* @return database definition
*/
public static DatabaseDefinition from(Map<String, Set<NodeInfo>> partitions,
Set<NodeInfo> nodes) {
checkNotNull(partitions);
checkNotNull(nodes);
DatabaseDefinition definition = new DatabaseDefinition();
definition.partitions = ImmutableMap.copyOf(partitions);
definition.nodes = ImmutableSet.copyOf(nodes);
return definition;
}
/**
* Creates a new DatabaseDefinition using default partitions.
*
* @param nodes set of nodes
* @return database definition
*/
public static DatabaseDefinition from(Set<NodeInfo> nodes) {
return from(generateDefaultPartitions(nodes), nodes);
}
/**
* Returns the map of database partitions.
*
* @return db partition map
*/
public Map<String, Set<NodeInfo>> getPartitions() {
return partitions;
}
/**
* Returns the set of nodes.
*
* @return nodes
*/
public Set<NodeInfo> getNodes() {
return nodes;
}
/**
* Generates set of default partitions using permutations of the nodes.
*
* @param nodes information about cluster nodes
* @return default partition map
*/
private static Map<String, Set<NodeInfo>> generateDefaultPartitions(Set<NodeInfo> nodes) {
List<NodeInfo> sorted = new ArrayList<>(nodes);
Collections.sort(sorted, (o1, o2) -> o1.getId().compareTo(o2.getId()));
Map<String, Set<NodeInfo>> partitions = Maps.newHashMap();
int length = nodes.size();
int count = 3;
for (int i = 0; i < length; i++) {
Set<NodeInfo> set = new HashSet<>(count);
for (int j = 0; j < count; j++) {
set.add(sorted.get((i + j) % length));
}
partitions.put("p" + (i + 1), set);
}
return partitions;
}
}
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