java.nio.channels.spi
Class AbstractSelector

java.lang.Object
  java.nio.channels.Selector
      java.nio.channels.spi.AbstractSelector

public abstract class AbstractSelector
extends Selector

Abstract class for selectors.

This class realizes the interruption of selection by begin and end. It also holds the cancelled and the deletion of the key set.

Constructor Summary

protected

AbstractSelector(SelectorProvider selectorProvider) Constructor for this class.

Method Summary

protected void	begin() This starts a potentially blocking I/O operation
(package private) void	cancel(SelectionKey key)
protected Set<SelectionKey>	cancelledKeys() Returns the cancelled key set of this channel.
void	close() Closes this channel.
protected void	deregister(AbstractSelectionKey key) Deletes the key from channel's key set.
protected void	end() This ends a potentially blocking I/O operation
protected abstract void	implCloseSelector() Implements the closing of this channel.
boolean	isOpen() Tells whether this selector is open.
SelectorProvider	provider() Returns the SelectorProvider of this channel.
protected abstract SelectionKey	register(AbstractSelectableChannel channel, int operations, Object attachment) Registers a channel to this selector.

Methods inherited from class java.nio.channels.Selector

keys, open, select, select, selectedKeys, selectNow, wakeup

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractSelector

protected AbstractSelector(SelectorProvider selectorProvider)

Constructor for this class.

Parameters:

selectorProvider - A instance of SelectorProvider

Method Detail

close

public final void close()
                 throws IOException

Closes this channel.

Specified by:

close in class Selector

Throws:

IOException - if I/O error occurs

See Also:

Selector.close()

implCloseSelector

protected abstract void implCloseSelector()
                                   throws IOException

Implements the closing of this channel.

Throws:

IOException - If some I/O exception occurs.

isOpen

public final boolean isOpen()

Description copied from class: Selector

Tells whether this selector is open.

Specified by:

isOpen in class Selector

Returns:

true if this selector is not closed

See Also:

Selector.isOpen()

provider

public final SelectorProvider provider()

Returns the SelectorProvider of this channel.

Specified by:

provider in class Selector

Returns:

the provider of this selector

See Also:

Selector.provider()

cancelledKeys

protected final Set<SelectionKey> cancelledKeys()

Returns the cancelled key set of this channel.

Returns:

The cancelled key set.

register

protected abstract SelectionKey register(AbstractSelectableChannel channel,
                                         int operations,
                                         Object attachment)

Registers a channel to this selector.

Parameters:

channel - The channel to be registered.

operations - The interest set.

attachment - The attachment of the key.

Returns:

The key related with the channel and the selector.

deregister

protected final void deregister(AbstractSelectionKey key)

Deletes the key from channel's key set.

Parameters:

key - The key.

begin

protected final void begin()

This starts a potentially blocking I/O operation

end

protected final void end()

This ends a potentially blocking I/O operation

cancel

void cancel(SelectionKey key)