Package java.nio.channels.spi

Class AbstractSelector

java.lang.Object

java.nio.channels.Selector

java.nio.channels.spi.AbstractSelector

All Implemented Interfaces:

Closeable, AutoCloseable

public abstract class AbstractSelector
extends Selector

AbstractSelector is the base implementation class for selectors. It realizes the interruption of selection by begin and end. It also holds the cancellation and the deletion of the key set.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractSelector(SelectorProvider selectorProvider)

Method Summary

Modifier and Type	Method	Description
protected void	begin()	Indicates the beginning of a code section that includes an I/O operation that is potentially blocking.
protected Set<SelectionKey>	cancelledKeys()	Returns this channel's set of canceled selection keys.
void	close()	Closes this selector.
protected void	deregister(AbstractSelectionKey key)	Deletes the key from the channel's key set.
protected void	end()	Indicates the end of a code section that has been started with begin() and that includes a potentially blocking I/O operation.
protected abstract void	implCloseSelector()	Implements the closing of this channel.
boolean	isOpen()	Returns true if this selector is open.
SelectorProvider	provider()	Returns this selector's provider.
protected abstract SelectionKey	register(AbstractSelectableChannel channel, int operations, Object attachment)	Registers channel with 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)

Method Detail

close

public final void close()
                 throws IOException

Closes this selector. This method does nothing if this selector is already closed. The actual closing must be implemented by subclasses in implCloseSelector().

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Specified by:

close in class Selector

Throws:

IOException - if an I/O error occurs.

implCloseSelector

protected abstract void implCloseSelector()
                                   throws IOException

Implements the closing of this channel.

Throws:

IOException

isOpen

public final boolean isOpen()

Returns true if this selector is open.

Specified by:

isOpen in class Selector

Returns:

true if this selector is not closed, false otherwise.

provider

public final SelectorProvider provider()

Returns this selector's provider.

Specified by:

provider in class Selector

Returns:

the provider of this selector.

cancelledKeys

protected final Set<SelectionKey> cancelledKeys()

Returns this channel's set of canceled selection keys.

register

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

Registers channel with this selector.

Parameters:

operations - the interest set of channel.

attachment - the attachment for the selection key.

Returns:

the key related to the channel and this selector.

deregister

protected final void deregister(AbstractSelectionKey key)

Deletes the key from the channel's key set.

begin

protected final void begin()

Indicates the beginning of a code section that includes an I/O operation that is potentially blocking. After this operation, the application should invoke the corresponding end(boolean) method.

end

protected final void end()

Indicates the end of a code section that has been started with begin() and that includes a potentially blocking I/O operation.