com.gemstone.gemfire.internal.shared

Class ChannelBufferInputStream

java.lang.Object

java.io.InputStream

com.gemstone.gemfire.internal.shared.InputStreamChannel

com.gemstone.gemfire.internal.shared.ChannelBufferInputStream

All Implemented Interfaces:

Closeable, AutoCloseable, Channel, ReadableByteChannel

Direct Known Subclasses:

ChannelBufferFramedInputStream

public class ChannelBufferInputStream
extends InputStreamChannel

Base class for use by buffered abstractions over channel using direct byte buffers. This particular class can be used as a much more efficient replacement for BufferedInputStream.

Note that the close() method of this class does not closing the underlying channel.

Since:

gfxd 1.0

Field Summary

Fields

Modifier and Type	Field and Description
protected ByteBuffer	buffer
static int	DEFAULT_BUFFER_SIZE

Fields inherited from class com.gemstone.gemfire.internal.shared.InputStreamChannel

channel, PARK_NANOS, PARK_NANOS_MAX, parkedThread

Constructor Summary

Constructors

Constructor and Description
ChannelBufferInputStream(ReadableByteChannel channel)
ChannelBufferInputStream(ReadableByteChannel channel, int bufferSize)

Method Summary

Methods

Modifier and Type	Method and Description
protected ByteBuffer	allocateBuffer(int bufferSize)
int	available()
void	close()
boolean	isOpen()
int	read()
int	read(byte[] buf, int off, int len)
int	read(ByteBuffer dst)
int	readInt() Reads four input bytes and returns an int value.

Methods inherited from class com.gemstone.gemfire.internal.shared.InputStreamChannel

getParkedThread, getUnderlyingChannel, readBuffered, readFrame, readFrameFragment, readIntoBuffer, readIntoBufferNonBlocking, refillBuffer, resetAndCopyLeftOverBytes

Methods inherited from class java.io.InputStream

mark, markSupported, read, reset, skip

Methods inherited from class java.lang.Object

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

Field Detail

buffer

protected final ByteBuffer buffer

DEFAULT_BUFFER_SIZE

public static final int DEFAULT_BUFFER_SIZE

See Also:

Constant Field Values

Constructor Detail

ChannelBufferInputStream

public ChannelBufferInputStream(ReadableByteChannel channel)
                         throws IOException

Throws:

IOException

ChannelBufferInputStream

public ChannelBufferInputStream(ReadableByteChannel channel,
                        int bufferSize)
                         throws IOException

Throws:

IOException

Method Detail

allocateBuffer

protected ByteBuffer allocateBuffer(int bufferSize)

read

public final int read()
               throws IOException

Specified by:

read in class InputStream

Throws:

IOException

read

public final int read(byte[] buf,
       int off,
       int len)
               throws IOException

Overrides:

read in class InputStream

Throws:

IOException

read

public final int read(ByteBuffer dst)
               throws IOException

Specified by:

read in interface ReadableByteChannel

Specified by:

read in class InputStreamChannel

Throws:

IOException

readInt

public final int readInt()
                  throws IOException

Reads four input bytes and returns an int value. Let a-d be the first through fourth bytes read. The value returned is:

 
 (((a & 0xff) << 24) | ((b & 0xff) << 16) |
  ((c & 0xff) << 8) | (d & 0xff))
 
 

This method is suitable for reading bytes written by the writeInt method of interface DataOutput.

Specified by:

readInt in class InputStreamChannel

Returns:

the int value read.

Throws:

EOFException - if this stream reaches the end before reading all the bytes.

IOException - if an I/O error occurs.

available

public final int available()
                    throws IOException

Overrides:

available in class InputStream

Throws:

IOException

isOpen

public final boolean isOpen()

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Channel

Overrides:

close in class InputStream

Throws:

IOException