com.gemstone.gemfire.internal.shared

Class InputStreamChannel

java.lang.Object

java.io.InputStream

com.gemstone.gemfire.internal.shared.InputStreamChannel

All Implemented Interfaces:

Closeable, AutoCloseable, Channel, ReadableByteChannel

Direct Known Subclasses:

ChannelBufferInputStream, ChannelBufferUnsafeInputStream

public abstract class InputStreamChannel
extends InputStream
implements ReadableByteChannel, Closeable

Intermediate class that extends both an InputStream and ReadableByteChannel.

Since:

gfxd 1.1

Field Summary

Fields

Modifier and Type	Field and Description
protected long	bytesRead
protected ReadableByteChannel	channel
protected static long	PARK_NANOS_MAX Maximum nanos to park reader thread to wait for writing data in non-blocking mode (if selector is present then it will explicitly signal)
protected Thread	parkedThread

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	InputStreamChannel(ReadableByteChannel channel)

Method Summary

Modifier and Type	Method and Description
long	getBytesRead()
Thread	getParkedThread()
ReadableByteChannel	getUnderlyingChannel() Get the underlying ReadableByteChannel.
abstract int	read(ByteBuffer dst)
protected int	readBuffered(ByteBuffer dst, ByteBuffer channelBuffer) Common base method to read into a given ByteBuffer destination via an intermediate direct byte buffer owned by the implementation of this class.
int	readFrame()
int	readFrameFragment(int fragmentSize)
abstract int	readInt() Reads four input bytes and returns an int value.
protected int	readIntoBuffer(ByteBuffer buffer) Fill the given buffer reading data from channel at least one byte unless end-of-stream has been reached.
protected int	readIntoBufferNonBlocking(ByteBuffer buffer) Fill the given buffer reading data from channel whatever is available in one call (non-blocking if channel is so configured).
protected int	refillBuffer(ByteBuffer channelBuffer, int tryReadBytes, String eofMessage)
protected int	refillBufferBase(ByteBuffer channelBuffer, int tryReadBytes, String eofMessage)
protected void	resetAndCopyLeftOverBytes(ByteBuffer channelBuffer)

Methods inherited from class java.io.InputStream

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.nio.channels.Channel

close, isOpen

Field Detail

channel

protected final ReadableByteChannel channel

parkedThread

protected volatile Thread parkedThread

bytesRead

protected volatile long bytesRead

PARK_NANOS_MAX

protected static final long PARK_NANOS_MAX

Maximum nanos to park reader thread to wait for writing data in non-blocking mode (if selector is present then it will explicitly signal)

See Also:

Constant Field Values

Constructor Detail

InputStreamChannel

protected InputStreamChannel(ReadableByteChannel channel)

Method Detail

getUnderlyingChannel

public final ReadableByteChannel getUnderlyingChannel()

Get the underlying ReadableByteChannel.

read

public abstract int read(ByteBuffer dst)
                  throws IOException

Specified by:

read in interface ReadableByteChannel

Throws:

IOException

readInt

public abstract 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.

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.

readFrame

public int readFrame()
              throws IOException

Throws:

IOException

readFrameFragment

public int readFrameFragment(int fragmentSize)
                      throws IOException

Throws:

IOException

readBuffered

protected final int readBuffered(ByteBuffer dst,
                                 ByteBuffer channelBuffer)
                          throws IOException

Common base method to read into a given ByteBuffer destination via an intermediate direct byte buffer owned by the implementation of this class.

Throws:

IOException

refillBuffer

protected int refillBuffer(ByteBuffer channelBuffer,
                           int tryReadBytes,
                           String eofMessage)
                    throws IOException

Throws:

IOException

refillBufferBase

protected final int refillBufferBase(ByteBuffer channelBuffer,
                                     int tryReadBytes,
                                     String eofMessage)
                              throws IOException

Throws:

IOException

resetAndCopyLeftOverBytes

protected void resetAndCopyLeftOverBytes(ByteBuffer channelBuffer)

readIntoBuffer

protected int readIntoBuffer(ByteBuffer buffer)
                      throws IOException

Fill the given buffer reading data from channel at least one byte unless end-of-stream has been reached.

Returns:

number of bytes read or -1 on end-of-stream

Throws:

IOException

readIntoBufferNonBlocking

protected int readIntoBufferNonBlocking(ByteBuffer buffer)
                                 throws IOException

Fill the given buffer reading data from channel whatever is available in one call (non-blocking if channel is so configured).

Returns:

number of bytes read (can be zero) or -1 on end-of-stream

Throws:

IOException

getParkedThread

public final Thread getParkedThread()

getBytesRead

public final long getBytesRead()