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

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `AbstractSelectionKey()` Initializes a new instance of this class.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `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`

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