java.nio.channels

Class Selector

java.lang.Object

java.nio.channels.Selector

Direct Known Subclasses:

AbstractSelector

public abstract class Selector
extends Object

Since:

1.4

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Selector() Initializes the selector.

Method Summary

Methods

Modifier and Type	Method and Description
abstract void	close() Closes the selector.
abstract boolean	isOpen() Tells whether the selector is open or not.
abstract Set<SelectionKey>	keys() Returns this selector's key set.
static Selector	open() Opens a selector.
abstract SelectorProvider	provider() Returns the SelectorProvider that created the selector.
abstract int	select() Selects a set of keys whose corresponding channels are ready for I/O operations.
abstract int	select(long timeout) Selects a set of keys whose corresponding channels are ready for I/O operations.
abstract Set<SelectionKey>	selectedKeys() Returns this selector's selected-key set.
abstract int	selectNow() Selects a set of keys whose corresponding channels are ready for I/O operations.
abstract Selector	wakeup() Causes the first selection operation that has not yet returned to return immediately.

Methods inherited from class java.lang.Object

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

Constructor Detail

Selector

protected Selector()

Initializes the selector.

Method Detail

open

public static Selector open()
                     throws IOException

Opens a selector.

Throws:

IOException - If an error occurs

close

public abstract void close()
                    throws IOException

Closes the selector.

Throws:

IOException - If an error occurs

isOpen

public abstract boolean isOpen()

Tells whether the selector is open or not.

keys

public abstract Set<SelectionKey> keys()

Returns this selector's key set.

Throws:

ClosedSelectorException - If this selector is closed.

provider

public abstract SelectorProvider provider()

Returns the SelectorProvider that created the selector.

select

public abstract int select()
                    throws IOException

Selects a set of keys whose corresponding channels are ready for I/O operations.

Throws:

ClosedSelectorException - If this selector is closed.

IOException - If an error occurs

select

public abstract int select(long timeout)
                    throws IOException

Selects a set of keys whose corresponding channels are ready for I/O operations.

Parameters:

timeout - The timeout to use.

Throws:

ClosedSelectorException - If this selector is closed.

IllegalArgumentException - If the timeout value is negative.

IOException - If an error occurs

selectedKeys

public abstract Set<SelectionKey> selectedKeys()

Returns this selector's selected-key set.

Throws:

ClosedSelectorException - If this selector is closed.

selectNow

public abstract int selectNow()
                       throws IOException

Selects a set of keys whose corresponding channels are ready for I/O operations.

Throws:

ClosedSelectorException - If this selector is closed.

IOException - If an error occurs

wakeup

public abstract Selector wakeup()

Causes the first selection operation that has not yet returned to return immediately.