1 /**
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19 package org.apache.hadoop.hbase.regionserver;
20
21 /**
22 * Factory to create MetricsRegionServerSource when given a MetricsRegionServerWrapper
23 */
24 public class MetricsRegionServerSourceFactoryImpl implements MetricsRegionServerSourceFactory {
25 public static enum FactoryStorage {
26 INSTANCE;
27 private Object aggLock = new Object();
28 private MetricsRegionAggregateSourceImpl aggImpl;
29 }
30
31 private synchronized MetricsRegionAggregateSourceImpl getAggregate() {
32 synchronized (FactoryStorage.INSTANCE.aggLock) {
33 if (FactoryStorage.INSTANCE.aggImpl == null) {
34 FactoryStorage.INSTANCE.aggImpl = new MetricsRegionAggregateSourceImpl();
35 }
36 return FactoryStorage.INSTANCE.aggImpl;
37 }
38 }
39
40
41 @Override
42 public synchronized MetricsRegionServerSource createServer(MetricsRegionServerWrapper regionServerWrapper) {
43 return new MetricsRegionServerSourceImpl(regionServerWrapper);
44 }
45
46 @Override
47 public MetricsRegionSource createRegion(MetricsRegionWrapper wrapper) {
48 return new MetricsRegionSourceImpl(wrapper, getAggregate());
49 }
50 }