org.apache.drill.exec.util.filereader

Class DirectBufInputStream

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

org.apache.drill.exec.util.filereader.DirectBufInputStream

All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

BufferedDirectBufInputStream

public class DirectBufInputStream
extends FilterInputStream

Field Summary

Fields

Modifier and Type	Field and Description
protected BufferAllocator	allocator
protected boolean	enableHints
protected boolean	enforceTotalByteSize
protected long	startOffset The offset in the underlying stream to start reading from
protected String	streamId
protected long	totalByteSize The length of the data we expect to read.

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

Constructors

Constructor and Description
DirectBufInputStream(InputStream in, BufferAllocator allocator, String id, long startOffset, long totalByteSize, boolean enforceTotalByteSize, boolean enableHints)

Method Summary

Modifier and Type	Method and Description
protected void	checkInputStreamState()
protected void	checkStreamSupportsByteBuffer()
void	close()
protected static void	fadviseIfAvailable(org.apache.hadoop.fs.FSDataInputStream inputStream, long off, long n)
protected org.apache.hadoop.fs.FSDataInputStream	getInputStream()
DrillBuf	getNext(int bytes)
long	getPos()
boolean	hasRemainder()
void	init()
int	read()
int	read(DrillBuf buf, int off, int len)

Methods inherited from class java.io.FilterInputStream

available, mark, markSupported, read, read, reset, skip

Methods inherited from class java.lang.Object

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

Field Detail

enableHints

protected boolean enableHints

streamId

protected String streamId

allocator

protected BufferAllocator allocator

totalByteSize

protected final long totalByteSize

The length of the data we expect to read. The caller may, in fact, ask for more or less bytes. However this is useful for providing hints where the underlying InputStream supports hints (e.g. fadvise)

enforceTotalByteSize

protected final boolean enforceTotalByteSize

startOffset

protected final long startOffset

The offset in the underlying stream to start reading from

Constructor Detail

DirectBufInputStream

public DirectBufInputStream(InputStream in,
                            BufferAllocator allocator,
                            String id,
                            long startOffset,
                            long totalByteSize,
                            boolean enforceTotalByteSize,
                            boolean enableHints)

Method Detail

init

public void init()
          throws IOException,
                 UnsupportedOperationException

Throws:

IOException

UnsupportedOperationException

read

public int read()
         throws IOException

Overrides:

read in class FilterInputStream

Throws:

IOException

read

public int read(DrillBuf buf,
                int off,
                int len)
         throws IOException

Throws:

IOException

getNext

public DrillBuf getNext(int bytes)
                 throws IOException

Throws:

IOException

getPos

public long getPos()
            throws IOException

Throws:

IOException

hasRemainder

public boolean hasRemainder()
                     throws IOException

Throws:

IOException

getInputStream

protected org.apache.hadoop.fs.FSDataInputStream getInputStream()
                                                         throws IOException

Throws:

IOException

checkInputStreamState

protected void checkInputStreamState()
                              throws IOException

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Overrides:

close in class FilterInputStream

Throws:

IOException

checkStreamSupportsByteBuffer

protected void checkStreamSupportsByteBuffer()
                                      throws UnsupportedOperationException

Throws:

UnsupportedOperationException

fadviseIfAvailable

protected static void fadviseIfAvailable(org.apache.hadoop.fs.FSDataInputStream inputStream,
                                         long off,
                                         long n)