/**
* Copyright The Apache Software Foundation
*
* 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 com.alibaba.wasp.master.metrics;
import com.alibaba.wasp.master.MetricsMasterSourceImpl;
/**
* Factory to create MetricsMasterSource when given a MetricsMasterWrapper
*/
public class MetricsMasterSourceFactory {
private static enum FactoryStorage {
INSTANCE;
MetricsMasterSource masterSource;
}
public static synchronized MetricsMasterSource create(
MetricsMasterWrapper masterWrapper) {
if (FactoryStorage.INSTANCE.masterSource == null) {
FactoryStorage.INSTANCE.masterSource = new MetricsMasterSourceImpl(
masterWrapper);
}
return FactoryStorage.INSTANCE.masterSource;
}
}