io.druid.server.coordinator.DruidCluster.java Source code

Introduction

Here is the source code for io.druid.server.coordinator.DruidCluster.java

Source

/*
 * Druid - a distributed column store.
 * Copyright 2012 - 2015 Metamarkets Group Inc.
 *
 * 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 io.druid.server.coordinator;

import com.google.common.collect.Maps;
import com.google.common.collect.MinMaxPriorityQueue;
import com.google.common.collect.Ordering;
import io.druid.client.ImmutableDruidServer;

import java.util.Map;

/**
 * Contains a representation of the current state of the cluster by tier.
 * Each tier is mapped to the list of servers for that tier sorted by available space.
 */
public class DruidCluster {
    private final Map<String, MinMaxPriorityQueue<ServerHolder>> cluster;

    public DruidCluster() {
        this.cluster = Maps.newHashMap();
    }

    public DruidCluster(Map<String, MinMaxPriorityQueue<ServerHolder>> cluster) {
        this.cluster = cluster;
    }

    public void add(ServerHolder serverHolder) {
        ImmutableDruidServer server = serverHolder.getServer();
        MinMaxPriorityQueue<ServerHolder> tierServers = cluster.get(server.getTier());
        if (tierServers == null) {
            tierServers = MinMaxPriorityQueue.orderedBy(Ordering.natural().reverse()).create();
            cluster.put(server.getTier(), tierServers);
        }
        tierServers.add(serverHolder);
    }

    public Map<String, MinMaxPriorityQueue<ServerHolder>> getCluster() {
        return cluster;
    }

    public Iterable<String> getTierNames() {
        return cluster.keySet();
    }

    public MinMaxPriorityQueue<ServerHolder> getServersByTier(String tier) {
        return cluster.get(tier);
    }

    public Iterable<MinMaxPriorityQueue<ServerHolder>> getSortedServersByTier() {
        return cluster.values();
    }

    public boolean isEmpty() {
        return cluster.isEmpty();
    }

    public boolean hasTier(String tier) {
        MinMaxPriorityQueue<ServerHolder> servers = cluster.get(tier);
        return (servers == null) || servers.isEmpty();
    }

    public MinMaxPriorityQueue<ServerHolder> get(String tier) {
        return cluster.get(tier);
    }
}