hadoop IOStatisticsSource 源码
haddop IOStatisticsSource 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/statistics/IOStatisticsSource.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;
import org.apache.hadoop.classification.InterfaceStability;
/**
* A source of IO statistics.
* <p>
* These statistics MUST be instance specific, not thread local.
* </p>
*/
@InterfaceStability.Unstable
public interface IOStatisticsSource {
/**
* Return a statistics instance.
* <p>
* It is not a requirement that the same instance is returned every time.
* {@link IOStatisticsSource}.
* <p>
* If the object implementing this is Closeable, this method
* may return null if invoked on a closed object, even if
* it returns a valid instance when called earlier.
* @return an IOStatistics instance or null
*/
default IOStatistics getIOStatistics() {
return null;
}
}
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