hadoop Duration 源码
haddop Duration 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-services/hadoop-yarn-services-core/src/main/java/org/apache/hadoop/yarn/service/utils/Duration.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.yarn.service.utils;
import java.io.Closeable;
/**
* A duration in milliseconds. This class can be used
* to count time, and to be polled to see if a time limit has
* passed.
*/
public class Duration implements Closeable {
public long start, finish;
public final long limit;
/**
* Create a duration instance with a limit of 0
*/
public Duration() {
this(0);
}
/**
* Create a duration with a limit specified in millis
* @param limit duration in milliseconds
*/
public Duration(long limit) {
this.limit = limit;
}
/**
* Start
* @return self
*/
public Duration start() {
start = now();
return this;
}
/**
* The close operation relays to {@link #finish()}.
* Implementing it allows Duration instances to be automatically
* finish()'d in Java7 try blocks for when used in measuring durations.
*/
@Override
public final void close() {
finish();
}
public void finish() {
finish = now();
}
protected long now() {
return System.nanoTime()/1000000;
}
public long getInterval() {
return finish - start;
}
/**
* return true if the limit has been exceeded
* @return true if a limit was set and the current time
* exceeds it.
*/
public boolean getLimitExceeded() {
return limit >= 0 && ((now() - start) > limit);
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("Duration");
if (finish >= start) {
builder.append(" finished at ").append(getInterval()).append(" millis;");
} else {
if (start > 0) {
builder.append(" started but not yet finished;");
} else {
builder.append(" unstarted;");
}
}
if (limit > 0) {
builder.append(" limit: ").append(limit).append(" millis");
if (getLimitExceeded()) {
builder.append(" - exceeded");
}
}
return builder.toString();
}
}
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