hadoop StubDurationTrackerFactory 源码
haddop StubDurationTrackerFactory 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/statistics/impl/StubDurationTrackerFactory.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.fs.statistics.impl;
import org.apache.hadoop.fs.statistics.DurationTracker;
import org.apache.hadoop.fs.statistics.DurationTrackerFactory;
/**
* This is a stub factory which always returns no-op duration
* trackers. Allows for code to always be handed a factory.
*/
public final class StubDurationTrackerFactory
implements DurationTrackerFactory {
/**
* Single instance.
*/
public static final StubDurationTrackerFactory STUB_DURATION_TRACKER_FACTORY
= new StubDurationTrackerFactory();
private StubDurationTrackerFactory() {
}
@Override
public DurationTracker trackDuration(final String key, final long count) {
return StubDurationTracker.STUB_DURATION_TRACKER;
}
}
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