seda.nbio
Class SelectSetPollImpl

java.lang.Object
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  +--seda.nbio.SelectSetImpl
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        +--seda.nbio.SelectSetPollImpl

class SelectSetPollImpl

extends SelectSetImpl

SelectSetPollImpl is an implementation of SelectSet which uses the UNIX poll(2) system call.

See Also:

SelectSet

Constructor Summary

(package private)

SelectSetPollImpl() Create a SelectSetPollImpl with no SelectItems.

Method Summary

(package private) void	add(SelectItem sel) Add a SelectItem to this SelectSetPollImpl.
(package private) void	add(SelectItem[] selarr) Add all of the SelectItems in the given array to the SelectSetPollImpl.
(package private) SelectItem	elementAt(int index) Return the SelectItem at the given index.
(package private) SelectItem[]	getEvents() Returns an array of SelectItems for which some events have occurred (that is, that the revents field is nonzero).
(package private) SelectItem[]	getEvents(short mask) Returns an array of SelectItems for which events matching the given event mask have occurred (that is, that the revents field matches the given mask).
(package private) static boolean	isSupported() Returns true if poll(2) is supported on this platform.
(package private) int	numActive() Return the number of active SelectItems in this SelectSetPollImpl.
(package private) void	remove(int index) Remove the SelectItem at the given index from the SelectSetPollImpl.
(package private) void	remove(SelectItem sel) Remove a SelectItem from the SelectSetPollImpl.
(package private) void	remove(SelectItem[] selarr) Remove all of the SelectItems in the given array from the SelectSetPollImpl.
(package private) int	select(int timeout) Wait for events to occur on the SelectItems in this SelectSetPollImpl.
(package private) int	size() Return the number of SelectItems in this SelectSetPollImpl.
java.lang.String	toString()
(package private) void	update() Update any changed event masks in the SelectSet.
(package private) void	update(SelectItem sel) Update any changed event masks in this SelectItem.

Methods inherited from class java.lang.Object

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

Constructor Detail

SelectSetPollImpl

SelectSetPollImpl()

Create a SelectSetPollImpl with no SelectItems.

Method Detail

isSupported

static boolean isSupported()

Returns true if poll(2) is supported on this platform.

add

void add(SelectItem sel)

Add a SelectItem to this SelectSetPollImpl.

Overrides:

add in class SelectSetImpl

add

void add(SelectItem[] selarr)

Add all of the SelectItems in the given array to the SelectSetPollImpl.

Overrides:

add in class SelectSetImpl

remove

void remove(SelectItem sel)

Remove a SelectItem from the SelectSetPollImpl.

Overrides:

remove in class SelectSetImpl

remove

void remove(SelectItem[] selarr)

Remove all of the SelectItems in the given array from the SelectSetPollImpl.

Overrides:

remove in class SelectSetImpl

remove

void remove(int index)

Remove the SelectItem at the given index from the SelectSetPollImpl.

Overrides:

remove in class SelectSetImpl

update

void update()

Update any changed event masks in the SelectSet. Does nothing in this implementation.

Overrides:

update in class SelectSetImpl

update

void update(SelectItem sel)

Update any changed event masks in this SelectItem. Does nothing in this implementation.

Overrides:

update in class SelectSetImpl

size

int size()

Return the number of SelectItems in this SelectSetPollImpl.

Overrides:

size in class SelectSetImpl

numActive

int numActive()

Return the number of active SelectItems in this SelectSetPollImpl.

Overrides:

numActive in class SelectSetImpl

elementAt

SelectItem elementAt(int index)

Return the SelectItem at the given index.

Overrides:

elementAt in class SelectSetImpl

select

int select(int timeout)

Wait for events to occur on the SelectItems in this SelectSetPollImpl. Upon return, the 'revents' field of each SelectItem will be set to the mask of events that occurred. Note that this method does not set revents to 0 when called; after processing an event, it is the application's responsibility to clear the revents field. This is intentional: if the application wishes to delay the processing of an event, it can leave the revents field as-is so that subsequent calls to select will continue to indicate that the event is pending.

IMPORTANT NOTE: If timeout is non-zero, this call will block the thread which invokes it. If you are using Green Threads, this will block the entire JVM. Unless you have a single-threaded application, you should only use SelectSet.select() with native threads.

Overrides:

select in class SelectSetImpl

Parameters:

timeout - The maximum number of milliseconds to block waiting for an event to occur. A timeout of 0 means than select should not block; a timeout of -1 means that select should block indefinitely.

Returns:

The number of events received, or 0 if no events occurred.

getEvents

SelectItem[] getEvents(short mask)

Returns an array of SelectItems for which events matching the given event mask have occurred (that is, that the revents field matches the given mask). This is a convenience method and is not meant to be optimized; since it scans the SelectItem array and creates a new reference array, it imposes higher overhead than the application scanning the SelectItem array directly, using the size() and elementAt() methods.

Overrides:

getEvents in class SelectSetImpl

getEvents

SelectItem[] getEvents()

Returns an array of SelectItems for which some events have occurred (that is, that the revents field is nonzero). This is a convenience method and is not meant to be optimized; since it scans the SelectItem array and creates a new reference array, it imposes higher overhead than the application scanning the SelectItem array directly, using the size() and elementAt() methods.

Overrides:

getEvents in class SelectSetImpl

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object