Class AbstractSelectionKey

java.lang.Object

java.nio.channels.SelectionKey

java.nio.channels.spi.AbstractSelectionKey

public abstract class AbstractSelectionKey
extends SelectionKey

Base implementation class for selection keys.

This class tracks the validity of the key and implements cancellation.

Since:

1.4

Field Summary

Fields declared in class SelectionKey

OP_ACCEPT, OP_CONNECT, OP_READ, OP_WRITE

Modifier and Type	Field	Description
static final int	OP_ACCEPT	Operation-set bit for socket-accept operations.
static final int	OP_CONNECT	Operation-set bit for socket-connect operations.
static final int	OP_READ	Operation-set bit for read operations.
static final int	OP_WRITE	Operation-set bit for write operations.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractSelectionKey()	Initializes a new instance of this class.

Method Summary

Modifier and Type	Method	Description
final void	cancel()	Cancels this key.
final boolean	isValid()	Tells whether or not this key is valid.

Methods declared in class SelectionKey

attach, attachment, channel, interestOps, interestOps, interestOpsAnd, interestOpsOr, isAcceptable, isConnectable, isReadable, isWritable, readyOps, selector

Modifier and Type	Method	Description
final Object	attach(Object ob)	Attaches the given object to this key.
final Object	attachment()	Retrieves the current attachment.
abstract SelectableChannel	channel()	Returns the channel for which this key was created.
abstract int	interestOps()	Retrieves this key's interest set.
abstract SelectionKey	interestOps(int ops)	Sets this key's interest set to the given value.
int	interestOpsAnd(int ops)	Atomically sets this key's interest set to the bitwise intersection ("and") of the existing interest set and the given value.
int	interestOpsOr(int ops)	Atomically sets this key's interest set to the bitwise union ("or") of the existing interest set and the given value.
final boolean	isAcceptable()	Tests whether this key's channel is ready to accept a new socket connection.
final boolean	isConnectable()	Tests whether this key's channel has either finished, or failed to finish, its socket-connection operation.
final boolean	isReadable()	Tests whether this key's channel is ready for reading.
final boolean	isWritable()	Tests whether this key's channel is ready for writing.
abstract int	readyOps()	Retrieves this key's ready-operation set.
abstract Selector	selector()	Returns the selector for which this key was created.

Methods declared in class Object

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

Modifier and Type	Method	Description
protected Object	clone()	Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
boolean	equals(Object o)	Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
protected void	finalize()	Deprecated, for removal: This API element is subject to removal in a future version. May cause performance issues, deadlocks and hangs.
final Class<? extends Object>	getClass()	Answers the unique instance of java.lang.Class which represents the class of the receiver.
int	hashCode()	Answers an integer hash code for the receiver.
final void	notify()	Causes one thread which is waiting on the receiver to be made ready to run.
final void	notifyAll()	Causes all threads which are waiting on the receiver to be made ready to run.
String	toString()	Answers a string containing a concise, human-readable description of the receiver.
final void	wait()	Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
final void	wait(long time)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
final void	wait(long time, int frac)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

Constructor Details

AbstractSelectionKey

protected AbstractSelectionKey()

Initializes a new instance of this class.

Method Details

isValid

public final boolean isValid()

Description copied from class: SelectionKey

Tells whether or not this key is valid.

A key is valid upon creation and remains so until it is cancelled, its channel is closed, or its selector is closed.

Specified by:

isValid in class SelectionKey

Returns:

true if, and only if, this key is valid

cancel

public final void cancel()

Cancels this key.

If this key has not yet been cancelled then it is added to its selector's cancelled-key set while synchronized on that set.

Specified by:

cancel in class SelectionKey