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Java Source Code / Java Documentation » Web Server » Rimfaxe Web Server » seda.sandStorm.lib.aSocket.nio

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

seda.sandStorm.lib.aSocket.nio .NIOSelectSource

NIOSelectSource

public class NIOSelectSource implements SelectSourceIF(Code)

A NIOSelectSource is an implementation of SourceIF which pulls events from the operating system via the NIO Selector interface. This can be thought of as a 'shim' which turns a Selector into a SourceIF.

NIOSelectSource also "balances" the set of events returned on subsequent calls to dequeue, in order to avoid biasing the servicing of underlying O/S events to a particular order. This feature can be disabled by creating a SelectSource with the boolean flag 'do_balance'.

Important note: This class is not threadsafe with respect to multiple threads calling dequeue() or blocking_dequeue() at once. Clients must synchronize their access to this class.
author:
Matt Welsh

Constructor Summary
public	NIOSelectSource() Create a new empty SelectSource.
public	NIOSelectSource(boolean do_balance) Create a new empty SelectSource.

Method Summary
public QueueElementIF	blocking_dequeue(int timeout_millis) Dequeue the next element from the SelectSource.
public QueueElementIF[]	blocking_dequeue(int timeout_millis, int num) Dequeue a set of elements from the SelectSource.
public QueueElementIF[]	blocking_dequeue_all(int timeout_millis) Dequeue a set of elements from the SelectSource.
public QueueElementIF	dequeue() Dequeues the next element from the SelectSource without blocking.
public QueueElementIF[]	dequeue(int num) Dequeues at most `num` elements which are ready from the SelectSource.
public QueueElementIF[]	dequeue_all() Dequeues all elements which are ready from the SelectSource.
public void	deregister(Object selkey_obj) Deregister a SelectItem with this SelectSource. Note that after calling deregister, subsequent calls to dequeue may in fact return this SelectItem as a result.
public Selector	getSelector()
public int	numActive() Return the number of active SelectItems registered with the SelectSource.
public int	numRegistered() Return the number of SelectItems registered with the SelectSource.
public Object	register(Object nio_sc_obj, int ops) Register a SelectItem with the SelectSource.
public void	register(Object sel)
void	setName(String thename)
public int	size() Return the number of elements waiting in the queue (that is, which don't require a SelectSet poll operation to retrieve).
public String	toString()
public void	update() Must be called if the 'events' mask of any SelectItem registered with this SelectSource changes.
public void	update(Object sel) Must be called if the 'events' mask of this SelectItem (which must be registered with this SelectSource) changes.

Constructor Detail

NIOSelectSource
public NIOSelectSource()(Code)
	Create a new empty SelectSource. This SelectSource will perform event balancing.

NIOSelectSource
public NIOSelectSource(boolean do_balance)(Code)
	Create a new empty SelectSource. Parameters: do_balance - Indicates whether this SelectSource should performevent balancing.

Method Detail

blocking_dequeue
public QueueElementIF blocking_dequeue(int timeout_millis)(Code)
	Dequeue the next element from the SelectSource. Blocks up to timeout_millis milliseconds; returns null if no entries available after that time. A timeout of -1 blocks forever.

blocking_dequeue
public QueueElementIF[] blocking_dequeue(int timeout_millis, int num)(Code)
	Dequeue a set of elements from the SelectSource. Blocks up to timeout_millis milliseconds; returns null if no entries available after that time. A timeout of -1 blocks forever.

blocking_dequeue_all
public QueueElementIF[] blocking_dequeue_all(int timeout_millis)(Code)
	Dequeue a set of elements from the SelectSource. Blocks up to timeout_millis milliseconds; returns null if no entries available after that time. A timeout of -1 blocks forever.

dequeue
public QueueElementIF dequeue()(Code)
	Dequeues the next element from the SelectSource without blocking. Returns null if no entries available.

dequeue
public QueueElementIF[] dequeue(int num)(Code)
	Dequeues at most `num` elements which are ready from the SelectSource. Returns null if no entries available.

dequeue_all
public QueueElementIF[] dequeue_all()(Code)
	Dequeues all elements which are ready from the SelectSource. Returns null if no entries available.

deregister
public void deregister(Object selkey_obj)(Code)
	Deregister a SelectItem with this SelectSource. Note that after calling deregister, subsequent calls to dequeue may in fact return this SelectItem as a result. This is because the SelectQueue internally caches results.

getSelector
public Selector getSelector()(Code)

numActive
public int numActive()(Code)
	Return the number of active SelectItems registered with the SelectSource. An active SelectItem is one defined as having a non-zero events interest mask.

numRegistered
public int numRegistered()(Code)
	Return the number of SelectItems registered with the SelectSource.

register
public Object register(Object nio_sc_obj, int ops)(Code)
	Register a SelectItem with the SelectSource. The SelectItem should generally correspond to a Selectable along with a set of event flags that we wish this SelectSource to test for. The user is allowed to modify the event flags in the SelectItem directly (say, to cause the SelectSource ignore a given SelectItem for the purposes of future calls to one of the dequeue methods). However, modifying the event flags may not be synchronous with calls to dequeue - generally because SelectSource maintains a cache of recently-received events.

register
public void register(Object sel)(Code)

setName
void setName(String thename)(Code)

size
public int size()(Code)
	Return the number of elements waiting in the queue (that is, which don't require a SelectSet poll operation to retrieve).

toString
public String toString()(Code)

update
public void update()(Code)
	Must be called if the 'events' mask of any SelectItem registered with this SelectSource changes. Pushes event mask changes down to the underlying event-dispatch mechanism.

update
public void update(Object sel)(Code)
	Must be called if the 'events' mask of this SelectItem (which must be registered with this SelectSource) changes. Pushes event mask changes down to the underlying event-dispatch mechanism.

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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