org.openflow.example
Class SelectLoop

java.lang.Object
  org.openflow.example.SelectLoop

public class SelectLoop
extends java.lang.Object

Dirt simple SelectLoop for simple java controller

Field Summary

protected SelectListener	callback
protected boolean	dontStop
protected java.lang.Object	registrationLock
protected java.util.Queue<java.lang.Object[]>	registrationQueue
protected int	registrationRequests
protected java.nio.channels.Selector	selector
protected long	timeout

Constructor Summary

SelectLoop(SelectListener cb)

SelectLoop(SelectListener cb, long timeout)
Initializes this SelectLoop

Method Summary

void	doLoop() Main top-level IO loop this dispatches all IO events and timer events together I believe this is fairly efficient
protected void	processRegistrationQueue()
void	register(java.nio.channels.SelectableChannel ch, int ops, java.lang.Object arg)
java.nio.channels.SelectionKey	registerBlocking(java.nio.channels.SelectableChannel ch, int ops, java.lang.Object arg) Registers the supplied SelectableChannel with this SelectLoop.
void	shutdown() Shuts down this select loop, may return before it has fully shutdown
void	wakeup() Force this select loop to return immediately and re-enter select, useful for example if a new item has been added to the select loop while it was already blocked.

Methods inherited from class java.lang.Object

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

Field Detail

callback

protected SelectListener callback

dontStop

protected boolean dontStop

registrationLock

protected java.lang.Object registrationLock

registrationRequests

protected int registrationRequests

registrationQueue

protected java.util.Queue<java.lang.Object[]> registrationQueue

selector

protected java.nio.channels.Selector selector

timeout

protected long timeout

Constructor Detail

SelectLoop

public SelectLoop(SelectListener cb)
           throws java.io.IOException

Throws:

java.io.IOException

SelectLoop

public SelectLoop(SelectListener cb,
                  long timeout)
           throws java.io.IOException

Initializes this SelectLoop

Parameters:

cb - the callback to call when select returns

timeout - the timeout value in milliseconds that select will be called with

Throws:

java.io.IOException

Method Detail

register

public void register(java.nio.channels.SelectableChannel ch,
                     int ops,
                     java.lang.Object arg)
              throws java.nio.channels.ClosedChannelException

Throws:

java.nio.channels.ClosedChannelException

registerBlocking

public java.nio.channels.SelectionKey registerBlocking(java.nio.channels.SelectableChannel ch,
                                                       int ops,
                                                       java.lang.Object arg)
                                                throws java.nio.channels.ClosedChannelException

Registers the supplied SelectableChannel with this SelectLoop. Note this method blocks until registration proceeds. It is advised that SelectLoop is intialized with a timeout value when using this method.

Parameters:

ch - the channel

ops - interest ops

arg - argument that will be returned with the SelectListener

Returns:

Throws:

java.nio.channels.ClosedChannelException

doLoop

public void doLoop()
            throws java.io.IOException

Main top-level IO loop this dispatches all IO events and timer events together I believe this is fairly efficient

Throws:

java.io.IOException

processRegistrationQueue

protected void processRegistrationQueue()

wakeup

public void wakeup()

Force this select loop to return immediately and re-enter select, useful for example if a new item has been added to the select loop while it was already blocked.

shutdown

public void shutdown()

Shuts down this select loop, may return before it has fully shutdown