/** * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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.apache.hadoop.hbase.regionserver; /** * Factory to create MetricsRegionServerSource when given a MetricsRegionServerWrapper */ public class MetricsRegionServerSourceFactoryImpl implements MetricsRegionServerSourceFactory { private static enum FactoryStorage { INSTANCE; private MetricsRegionServerSource serverSource; private MetricsRegionAggregateSourceImpl aggImpl; } private synchronized MetricsRegionAggregateSourceImpl getAggregate() { if (FactoryStorage.INSTANCE.aggImpl == null) { FactoryStorage.INSTANCE.aggImpl = new MetricsRegionAggregateSourceImpl(); } return FactoryStorage.INSTANCE.aggImpl; } @Override public synchronized MetricsRegionServerSource createServer(MetricsRegionServerWrapper regionServerWrapper) { if (FactoryStorage.INSTANCE.serverSource == null) { FactoryStorage.INSTANCE.serverSource = new MetricsRegionServerSourceImpl( regionServerWrapper); } return FactoryStorage.INSTANCE.serverSource; } @Override public MetricsRegionSource createRegion(MetricsRegionWrapper wrapper) { return new MetricsRegionSourceImpl(wrapper, getAggregate()); } }