hadoop StubDurationTracker 源码
haddop StubDurationTracker 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/statistics/impl/StubDurationTracker.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 java.time.Duration;
import org.apache.hadoop.fs.statistics.DurationTracker;
/**
* A simple stub duration tracker which can be issued in interfaces
* and other places where full duration tracking is not implemented.
*/
public final class StubDurationTracker implements DurationTracker {
public static final DurationTracker STUB_DURATION_TRACKER =
new StubDurationTracker();
private StubDurationTracker() {
}
@Override
public void failed() {
}
@Override
public void close() {
}
@Override
public Duration asDuration() {
return Duration.ZERO;
}
}
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