AbstractSelectionKey

public abstract class AbstractSelectionKey
extends SelectionKey

java.lang.Object
↳	java.nio.channels.SelectionKey
	↳	java.nio.channels.spi.AbstractSelectionKey

Base implementation class for selection keys.

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

Summary

From class java.nio.channels.SelectionKey

`int`	`OP_ACCEPT` Operation-set bit for socket-accept operations.
`int`	`OP_CONNECT` Operation-set bit for socket-connect operations.
`int`	`OP_READ` Operation-set bit for read operations.
`int`	`OP_WRITE` Operation-set bit for write operations.

Protected constructors
`AbstractSelectionKey()` Initializes a new instance of this class.

Public methods
`final void`	`cancel()` Cancels this key.
`final boolean`	`isValid()` Tells whether or not this key is valid.

From class


        
          java.nio.channels.SelectionKey

`final Object`	`attach(Object ob)` Attaches the given object to this key.
`final Object`	`attachment()` Retrieves the current attachment.
`abstract void`	`cancel()` Requests that the registration of this key's channel with its selector be cancelled.
`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.
`abstract boolean`	`isValid()` Tells whether or not this key is valid.
`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.

From class


        
          java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Added in API level 1

protected AbstractSelectionKey ()

Initializes a new instance of this class.

Added in API level 1

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.

Added in API level 1

public final boolean isValid ()

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.

Returns
`boolean`	`true` if, and only if, this key is valid