com.gemstone.gemfire.internal.shared.unsafe

Class ChannelBufferUnsafeInputStream

java.lang.Object

java.io.InputStream

com.gemstone.gemfire.internal.shared.InputStreamChannel

com.gemstone.gemfire.internal.shared.unsafe.ChannelBufferUnsafeInputStream

All Implemented Interfaces:

StreamChannel, java.io.Closeable, java.lang.AutoCloseable, java.nio.channels.Channel, java.nio.channels.ReadableByteChannel

Direct Known Subclasses:

ChannelBufferUnsafeDataInputStream

public class ChannelBufferUnsafeInputStream
extends InputStreamChannel

A more efficient implementation of ChannelBufferInputStream using internal unsafe class (~30% in raw read calls). Use UnsafeHolder.newChannelBufferInputStream(java.nio.channels.ReadableByteChannel, int) method to create either this or ChannelBufferInputStream depending on availability.

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

Since:

gfxd 1.1

Field Summary

Fields

Modifier and Type	Field and Description
protected long	addrLimit
protected long	addrPosition Actual buffer position (+baseAddress) accounting is done by this.
protected long	baseAddress
protected java.nio.ByteBuffer	buffer

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

bytesRead, channel

Constructor Summary

Constructors

Constructor and Description
ChannelBufferUnsafeInputStream(java.nio.channels.ReadableByteChannel channel)
ChannelBufferUnsafeInputStream(java.nio.channels.ReadableByteChannel channel, int bufferSize)

Method Summary

Modifier and Type	Method and Description
protected java.nio.ByteBuffer	allocateBuffer(int bufferSize)
int	available()
void	close()
boolean	isOpen()
int	read()
int	read(byte[] buf)
int	read(byte[] buf, int off, int len)
int	read(java.nio.ByteBuffer dst)
int	readInt() Reads four input bytes and returns an int value.
protected int	refillBuffer(java.nio.ByteBuffer channelBuffer, int tryReadBytes, java.lang.String eofMessage)
protected void	resetBufferPositions()

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

getBytesRead, getParkedThread, getParkNanosMax, getUnderlyingChannel, readBuffered, readFrame, readFrameFragment, readIntoBuffer, readIntoBufferNoWait, refillBufferBase, resetAndCopyLeftOverBytes, setParkedThread

Methods inherited from class java.io.InputStream

mark, markSupported, reset, skip

Methods inherited from class java.lang.Object

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

Field Detail

buffer

protected java.nio.ByteBuffer buffer

baseAddress

protected final long baseAddress

addrPosition

protected long addrPosition

Actual buffer position (+baseAddress) accounting is done by this. Buffer position is adjusted during refill and other places where required using this.

addrLimit

protected long addrLimit

Constructor Detail

ChannelBufferUnsafeInputStream

public ChannelBufferUnsafeInputStream(java.nio.channels.ReadableByteChannel channel)

ChannelBufferUnsafeInputStream

public ChannelBufferUnsafeInputStream(java.nio.channels.ReadableByteChannel channel,
                                      int bufferSize)

Method Detail

resetBufferPositions

protected final void resetBufferPositions()

allocateBuffer

protected java.nio.ByteBuffer allocateBuffer(int bufferSize)

read

public final int read()
               throws java.io.IOException

Specified by:

read in class java.io.InputStream

Throws:

java.io.IOException

read

public final int read(@Nonnull
                      byte[] buf)
               throws java.io.IOException

Overrides:

read in class java.io.InputStream

Throws:

java.io.IOException

read

public final int read(@Nonnull
                      byte[] buf,
                      int off,
                      int len)
               throws java.io.IOException

Overrides:

read in class java.io.InputStream

Throws:

java.io.IOException

read

public final int read(java.nio.ByteBuffer dst)
               throws java.io.IOException

Specified by:

read in interface java.nio.channels.ReadableByteChannel

Specified by:

read in class InputStreamChannel

Throws:

java.io.IOException

readInt

public final int readInt()
                  throws java.io.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:

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

java.io.IOException - if an I/O error occurs.

available

public final int available()

Overrides:

available in class java.io.InputStream

refillBuffer

protected int refillBuffer(java.nio.ByteBuffer channelBuffer,
                           int tryReadBytes,
                           java.lang.String eofMessage)
                    throws java.io.IOException

Overrides:

refillBuffer in class InputStreamChannel

Throws:

java.io.IOException

isOpen

public final boolean isOpen()

close

public void close()

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.nio.channels.Channel

Overrides:

close in class java.io.InputStream