001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.apache.hadoop.hbase.master; 019 020import org.apache.yetus.audience.InterfaceAudience; 021 022/** 023 * Factory to create MetricsMasterSource when given a MetricsMasterWrapper 024 */ 025@InterfaceAudience.Private 026public class MetricsMasterSourceFactoryImpl implements MetricsMasterSourceFactory { 027 028 @SuppressWarnings("ImmutableEnumChecker") 029 private static enum FactoryStorage { 030 INSTANCE; 031 032 private MetricsMasterSource masterSource; 033 } 034 035 @Override 036 public synchronized MetricsMasterSource create(MetricsMasterWrapper masterWrapper) { 037 if (FactoryStorage.INSTANCE.masterSource == null) { 038 FactoryStorage.INSTANCE.masterSource = new MetricsMasterSourceImpl(masterWrapper); 039 } 040 return FactoryStorage.INSTANCE.masterSource; 041 } 042}