hadoop WrappedIOStatistics 源码
haddop WrappedIOStatistics 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/statistics/impl/WrappedIOStatistics.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.util.Map;
import org.apache.hadoop.util.Preconditions;
import org.apache.hadoop.fs.statistics.IOStatistics;
import org.apache.hadoop.fs.statistics.MeanStatistic;
import static org.apache.hadoop.fs.statistics.IOStatisticsLogging.ioStatisticsToString;
/**
* Wrap IOStatistics source with another (dynamic) wrapper.
*/
public class WrappedIOStatistics extends AbstractIOStatisticsImpl {
/**
* The wrapped statistics.
*/
private IOStatistics wrapped;
/**
* Instantiate.
* @param wrapped nullable wrapped statistics.
*/
public WrappedIOStatistics(final IOStatistics wrapped) {
this.wrapped = wrapped;
}
/**
* Instantiate without setting the statistics.
* This is for subclasses which build up the map during their own
* construction.
*/
protected WrappedIOStatistics() {
}
@Override
public Map<String, Long> counters() {
return getWrapped().counters();
}
/**
* Get at the wrapped inner statistics.
* @return the wrapped value
*/
protected IOStatistics getWrapped() {
return wrapped;
}
/**
* Set the wrapped statistics.
* Will fail if the field is already set.
* @param wrapped new value
*/
protected void setWrapped(final IOStatistics wrapped) {
Preconditions.checkState(this.wrapped == null,
"Attempted to overwrite existing wrapped statistics");
this.wrapped = wrapped;
}
@Override
public Map<String, Long> gauges() {
return getWrapped().gauges();
}
@Override
public Map<String, Long> minimums() {
return getWrapped().minimums();
}
@Override
public Map<String, Long> maximums() {
return getWrapped().maximums();
}
@Override
public Map<String, MeanStatistic> meanStatistics() {
return getWrapped().meanStatistics();
}
/**
* Return the statistics dump of the wrapped statistics.
* @return the statistics for logging.
*/
@Override
public String toString() {
return ioStatisticsToString(wrapped);
}
}
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