001/**
002 * Copyright The Apache Software Foundation
003 *
004 * Licensed to the Apache Software Foundation (ASF) under one
005 * or more contributor license agreements.  See the NOTICE file
006 * distributed with this work for additional information
007 * regarding copyright ownership.  The ASF licenses this file
008 * to you under the Apache License, Version 2.0 (the
009 * "License"); you may not use this file except in compliance
010 * with the License.  You may obtain a copy of the License at
011 *
012 *     http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing, software
015 * distributed under the License is distributed on an "AS IS" BASIS,
016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017 * See the License for the specific language governing permissions and
018 * limitations under the License.
019 */
020package org.apache.hadoop.hbase.rsgroup;
021
022import java.util.HashSet;
023import java.util.Set;
024
025import org.apache.hadoop.hbase.ServerName;
026import org.apache.hadoop.hbase.master.MasterServices;
027import org.apache.hadoop.hbase.net.Address;
028import org.apache.yetus.audience.InterfaceAudience;
029
030/**
031 * Utility for this RSGroup package in hbase-rsgroup.
032 */
033@InterfaceAudience.Private
034final class Utility {
035  private Utility() {
036  }
037
038  /**
039   * @param master the master to get online servers for
040   * @return Set of online Servers named for their hostname and port (not ServerName).
041   */
042  static Set<Address> getOnlineServers(final MasterServices master) {
043    Set<Address> onlineServers = new HashSet<Address>();
044    if (master == null) {
045      return onlineServers;
046    }
047
048    for(ServerName server: master.getServerManager().getOnlineServers().keySet()) {
049      onlineServers.add(server.getAddress());
050    }
051    return onlineServers;
052  }
053}