spark SimpleDownloadFile 源码
spark SimpleDownloadFile 代码
文件路径：/common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/SimpleDownloadFile.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.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.WritableByteChannel;
import org.apache.spark.network.buffer.FileSegmentManagedBuffer;
import org.apache.spark.network.buffer.ManagedBuffer;
import org.apache.spark.network.util.TransportConf;
/**
* A DownloadFile that does not take any encryption settings into account for reading and
* writing data.
*
* This does *not* mean the data in the file is unencrypted -- it could be that the data is
* already encrypted when its written, and subsequent layer is responsible for decrypting.
*/
public class SimpleDownloadFile implements DownloadFile {
private final File file;
private final TransportConf transportConf;
public SimpleDownloadFile(File file, TransportConf transportConf) {
this.file = file;
this.transportConf = transportConf;
}
@Override
public boolean delete() {
return file.delete();
}
@Override
public DownloadFileWritableChannel openForWriting() throws IOException {
return new SimpleDownloadWritableChannel();
}
@Override
public String path() {
return file.getAbsolutePath();
}
private class SimpleDownloadWritableChannel implements DownloadFileWritableChannel {
private final WritableByteChannel channel;
SimpleDownloadWritableChannel() throws FileNotFoundException {
channel = Channels.newChannel(new FileOutputStream(file));
}
@Override
public ManagedBuffer closeAndRead() {
return new FileSegmentManagedBuffer(transportConf, file, 0, file.length());
}
@Override
public int write(ByteBuffer src) throws IOException {
return channel.write(src);
}
@Override
public boolean isOpen() {
return channel.isOpen();
}
@Override
public void close() throws IOException {
channel.close();
}
}
}
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