hadoop DefaultMetricsFactory 源码
haddop DefaultMetricsFactory 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/lib/DefaultMetricsFactory.java
/*
* 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.metrics2.lib;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.metrics2.MetricsException;
/**
* Experimental interface to extend metrics dynamically
*/
@InterfaceAudience.Private
public enum DefaultMetricsFactory {
INSTANCE; // the singleton
private MutableMetricsFactory mmfImpl;
public static MutableMetricsFactory getAnnotatedMetricsFactory() {
return INSTANCE.getInstance(MutableMetricsFactory.class);
}
@SuppressWarnings("unchecked")
public synchronized <T> T getInstance(Class<T> cls) {
if (cls == MutableMetricsFactory.class) {
if (mmfImpl == null) {
mmfImpl = new MutableMetricsFactory();
}
return (T) mmfImpl;
}
throw new MetricsException("Unknown metrics factory type: "+ cls.getName());
}
public synchronized void setInstance(MutableMetricsFactory factory) {
mmfImpl = factory;
}
}
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