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

Constructor Summary

AbstractSelectionKey()

Modifier	Constructor	Description
`protected`	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

Methods declared in class Object

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

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

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https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/nio/channels/spi/AbstractSelectionKey.html