voldemort.utils
Class SelectorManagerWorker

java.lang.Object
  voldemort.utils.SelectorManagerWorker

All Implemented Interfaces:

java.lang.Runnable

Direct Known Subclasses:

AsyncRequestHandler, ClientRequestExecutor

public abstract class SelectorManagerWorker
extends java.lang.Object
implements java.lang.Runnable

SelectorManagerWorker manages a Selector, SocketChannel, and IO streams implementation. At the point that the run method is invoked, the Selector with which the (socket) Channel has been registered has notified us that the socket has data to read or write.

The bulk of the complexity in this class surrounds partial reads and writes, as well as determining when all the data needed for the request has been read.

Field Summary

protected long	createTimestamp
protected ByteBufferBackedInputStream	inputStream
protected java.util.concurrent.atomic.AtomicBoolean	isClosed
protected org.apache.log4j.Logger	logger
protected ByteBufferBackedOutputStream	outputStream
protected int	resizeThreshold
protected java.nio.channels.Selector	selector
protected int	socketBufferSize
protected java.nio.channels.SocketChannel	socketChannel

Constructor Summary

SelectorManagerWorker(java.nio.channels.Selector selector, java.nio.channels.SocketChannel socketChannel, int socketBufferSize)

Method Summary

void	close()
protected void	closeInternal()
long	getCreateTimestamp() Returns the nanosecond-based timestamp of when this was created.
protected void	handleIncompleteRequest(int newPosition)
boolean	isClosed()
protected void	prepForWrite(java.nio.channels.SelectionKey selectionKey) Flips the output buffer, and lets the Selector know we're ready to write.
protected abstract void	read(java.nio.channels.SelectionKey selectionKey)
void	run()
protected void	traceInputBufferState(java.lang.String preamble)
protected abstract void	write(java.nio.channels.SelectionKey selectionKey)

Methods inherited from class java.lang.Object

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

Field Detail

selector

protected final java.nio.channels.Selector selector

socketChannel

protected final java.nio.channels.SocketChannel socketChannel

socketBufferSize

protected final int socketBufferSize

resizeThreshold

protected final int resizeThreshold

inputStream

protected final ByteBufferBackedInputStream inputStream

outputStream

protected final ByteBufferBackedOutputStream outputStream

createTimestamp

protected final long createTimestamp

isClosed

protected final java.util.concurrent.atomic.AtomicBoolean isClosed

logger

protected final org.apache.log4j.Logger logger

Constructor Detail

SelectorManagerWorker

public SelectorManagerWorker(java.nio.channels.Selector selector,
                             java.nio.channels.SocketChannel socketChannel,
                             int socketBufferSize)

Method Detail

read

protected abstract void read(java.nio.channels.SelectionKey selectionKey)
                      throws java.io.IOException

Throws:

java.io.IOException

write

protected abstract void write(java.nio.channels.SelectionKey selectionKey)
                       throws java.io.IOException

Throws:

java.io.IOException

getCreateTimestamp

public long getCreateTimestamp()

Returns the nanosecond-based timestamp of when this was created.

Returns:

Nanosecond-based timestamp of creation

run

public void run()

Specified by:

run in interface java.lang.Runnable

close

public void close()

closeInternal

protected void closeInternal()

isClosed

public boolean isClosed()

prepForWrite

protected void prepForWrite(java.nio.channels.SelectionKey selectionKey)

Flips the output buffer, and lets the Selector know we're ready to write.

Parameters:

selectionKey -

handleIncompleteRequest

protected void handleIncompleteRequest(int newPosition)

traceInputBufferState

protected void traceInputBufferState(java.lang.String preamble)