hadoop DurationInfo 源码
haddop DurationInfo 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/DurationInfo.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.util;
import java.util.function.Supplier;
import org.slf4j.Logger;
import org.apache.hadoop.classification.InterfaceAudience.Public;
import org.apache.hadoop.classification.InterfaceStability.Unstable;
/**
* A duration with logging of final state at info or debug
* in the {@code close()} call.
* This allows it to be used in a try-with-resources clause, and have the
* duration automatically logged.
*/
@Public
@Unstable
public class DurationInfo extends OperationDuration
implements AutoCloseable {
private final Supplier<String> text;
private String textStr;
private final Logger log;
/**
* Should the log be at INFO rather than DEBUG.
*/
private final boolean logAtInfo;
/**
* Create the duration text from a {@code String.format()} code call;
* log output at info level.
* @param log log to write to
* @param format format string
* @param args list of arguments
*/
public DurationInfo(Logger log, String format, Object... args) {
this(log, true, format, args);
}
/**
* Create the duration text from a {@code String.format()} code call
* and log either at info or debug.
* @param log log to write to
* @param logAtInfo should the log be at info, rather than debug
* @param format format string
* @param args list of arguments
*/
public DurationInfo(Logger log,
boolean logAtInfo,
String format,
Object... args) {
this.text = () -> String.format(format, args);
this.log = log;
this.logAtInfo = logAtInfo;
if (logAtInfo) {
log.info("Starting: {}", getFormattedText());
} else {
if (log.isDebugEnabled()) {
log.debug("Starting: {}", getFormattedText());
}
}
}
private String getFormattedText() {
return (textStr == null) ? (textStr = text.get()) : textStr;
}
@Override
public String toString() {
return getFormattedText() + ": duration " + super.toString();
}
@Override
public void close() {
finished();
if (logAtInfo) {
log.info("{}", this);
} else {
if (log.isDebugEnabled()) {
log.debug("{}", this);
}
}
}
}
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