spark DownloadFile 源码
spark DownloadFile 代码
文件路径：/common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/DownloadFile.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.spark.network.shuffle;
import java.io.IOException;
/**
* A handle on the file used when fetching remote data to disk. Used to ensure the lifecycle of
* writing the data, reading it back, and then cleaning it up is followed. Specific implementations
* may also handle encryption. The data can be read only via DownloadFileWritableChannel,
* which ensures data is not read until after the writer is closed.
*/
public interface DownloadFile {
/**
* Delete the file.
*
* @return <code>true</code> if and only if the file or directory is
* successfully deleted; <code>false</code> otherwise
*/
boolean delete();
/**
* A channel for writing data to the file. This special channel allows access to the data for
* reading, after the channel is closed, via {@link DownloadFileWritableChannel#closeAndRead()}.
*/
DownloadFileWritableChannel openForWriting() throws IOException;
/**
* The absolute path of the file.
*/
String path();
}
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