/*
* The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
* (the "License"). You may not use this work except in compliance with the License, which is
* available at www.apache.org/licenses/LICENSE-2.0
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied, as more fully set forth in the License.
*
* See the NOTICE file distributed with this work for information regarding copyright ownership.
*/
package alluxio.underfs.hdfs;
import org.apache.hadoop.fs.FSDataOutputStream;
import javax.annotation.concurrent.NotThreadSafe;
import java.io.IOException;
import java.io.OutputStream;
/**
* Output stream implementation for {@link HdfsUnderFileSystem}. This class is just a wrapper on top
* of an underlying {@link FSDataOutputStream}, except all calls to {@link #flush()} will be
* converted to {@link FSDataOutputStream#sync()}. This is currently safe because all invocations of
* flush intend the functionality to be sync.
*/
@NotThreadSafe
public class HdfsUnderFileOutputStream extends OutputStream {
/** Underlying output stream. */
final FSDataOutputStream mOut;
/**
* Basic constructor.
*
* @param out underlying stream to wrap
*/
public HdfsUnderFileOutputStream(FSDataOutputStream out) {
mOut = out;
}
@Override
public void close() throws IOException {
mOut.close();
}
@Override
public void flush() throws IOException {
// TODO(calvin): This functionality should be restricted to select output streams.
mOut.sync();
}
@Override
public void write(int b) throws IOException {
mOut.write(b);
}
@Override
public void write(byte[] b) throws IOException {
mOut.write(b);
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
mOut.write(b, off, len);
}
}