AbstractSelectionKey (Java 2 Platform SE v1.4.1) - JDK 5 Documentation v1.4.1, Java 2 SDK 英文文档

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Java^TM 2 Platform
Std. Ed. v1.4.1

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java.nio.channels.spi
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 inherited from class java.nio.channels.SelectionKey

OP_ACCEPT, OP_CONNECT, OP_READ, OP_WRITE

Constructor Summary

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

Method Summary

void cancel()
          Cancels this key.

boolean isValid()
          Tells whether or not this key is valid.

Methods inherited from class java.nio.channels.SelectionKey

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

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractSelectionKey

protected AbstractSelectionKey()

Initializes a new instance of this class.

Method Detail

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