alluxio.underfs.hdfs

Class HdfsPositionedUnderFileInputStream

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

alluxio.underfs.SeekableUnderFileInputStream

alluxio.underfs.hdfs.HdfsPositionedUnderFileInputStream

All Implemented Interfaces:

Positioned, PositionReader, Seekable, java.io.Closeable, java.lang.AutoCloseable

public class HdfsPositionedUnderFileInputStream
extends SeekableUnderFileInputStream
implements PositionReader

The input stream of HDFS as under filesystem. This input stream has two mode of operations. Under sequential mode, it uses the read api and can take advantage of underlying stream's buffering. Under random read mode, it uses the positionedRead FSDataInputStream API. This stream can be cached for reuse.

Field Summary

Fields inherited from class java.io.FilterInputStream

in

Method Summary

Modifier and Type	Method and Description
int	available()
void	close()
long	getPos()
boolean	markSupported()
int	read()
int	read(byte[] b)
int	read(byte[] buffer, int offset, int length) If there has been a number of sequential reads in a row, we move to regular buffered reads.
int	readInternal(long position, ReadTargetBuffer buffer, int length)
void	seek(long position)
long	skip(long n)

Methods inherited from class java.io.FilterInputStream

mark, reset

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface alluxio.PositionReader

read, read, read, read, read

Method Detail

available

public int available()
              throws java.io.IOException

Overrides:

available in class java.io.FilterInputStream

Throws:

java.io.IOException

getPos

public long getPos()

Specified by:

getPos in interface Positioned

read

public int read()

Overrides:

read in class java.io.FilterInputStream

read

public int read(byte[] b)

Overrides:

read in class java.io.FilterInputStream

read

public int read(byte[] buffer,
                int offset,
                int length)

If there has been a number of sequential reads in a row, we move to regular buffered reads.

Overrides:

read in class java.io.FilterInputStream

seek

public void seek(long position)

Specified by:

seek in interface Seekable

skip

public long skip(long n)

Overrides:

skip in class java.io.FilterInputStream

markSupported

public boolean markSupported()

Overrides:

markSupported in class java.io.FilterInputStream

readInternal

public int readInternal(long position,
                        ReadTargetBuffer buffer,
                        int length)
                 throws java.io.IOException

Specified by:

readInternal in interface PositionReader

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Specified by:

close in interface PositionReader

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Overrides:

close in class java.io.FilterInputStream

Throws:

java.io.IOException