hadoop EtagSource 源码
haddop EtagSource 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/EtagSource.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;
/**
* An optional interface for {@link FileStatus} subclasses to implement
* to provide access to etags.
* If available FS SHOULD also implement the matching PathCapabilities
* -- etag supported: {@link CommonPathCapabilities#ETAGS_AVAILABLE}.
* -- etag consistent over rename:
* {@link CommonPathCapabilities#ETAGS_PRESERVED_IN_RENAME}.
*/
public interface EtagSource {
/**
* Return an etag of this file status.
* A return value of null or "" means "no etag"
* @return a possibly null or empty etag.
*/
String getEtag();
}
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