java.nio.channels.spi
Class AbstractSelectableChannel

java.lang.Object
  java.nio.channels.spi.AbstractInterruptibleChannel
      java.nio.channels.SelectableChannel
          java.nio.channels.spi.AbstractSelectableChannel

All Implemented Interfaces:

Closeable, Channel, InterruptibleChannel

Direct Known Subclasses:

DatagramChannel, Pipe.SinkChannel, Pipe.SourceChannel, ServerSocketChannel, SocketChannel

public abstract class AbstractSelectableChannel
extends SelectableChannel

Abstract class for selectable channels.

In this class, there are methods about registering/deregistering a channel, about channel closing. It realize the multi-thread safe.

Constructor Summary

protected

AbstractSelectableChannel(SelectorProvider selectorProvider) Constructor for this class.

Method Summary

Object	blockingLock() Gets the blocking lock which synchronizes the configureBlocking and register methods.
SelectableChannel	configureBlocking(boolean blockingMode) Set the blocking mode of this channel.
protected void	implCloseChannel() Implement the closing function.
protected abstract void	implCloseSelectableChannel() Implement the closing function of the SelectableChannel.
protected abstract void	implConfigureBlocking(boolean flag)
boolean	isBlocking() Returns if channel is in blocking mode.
boolean	isRegistered() Returns if channel is registered.
SelectionKey	keyFor(Selector selector) Gets the selection key for the channel with the given selector.
SelectorProvider	provider() Answer the SelectorProvider of this channel.
SelectionKey	register(Selector selector, int interestSet, Object attachment) Realize the register function.

Methods inherited from class java.nio.channels.SelectableChannel

register, validOps

Methods inherited from class java.nio.channels.spi.AbstractInterruptibleChannel

begin, close, end, isOpen

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.nio.channels.Channel

close, isOpen

Constructor Detail

AbstractSelectableChannel

protected AbstractSelectableChannel(SelectorProvider selectorProvider)

Constructor for this class.

Parameters:

selectorProvider - A instance of SelectorProvider

Method Detail

provider

public final SelectorProvider provider()

Answer the SelectorProvider of this channel.

Specified by:

provider in class SelectableChannel

Returns:

The provider of this channel.

See Also:

provider()

isRegistered

public final boolean isRegistered()

Returns if channel is registered.

Specified by:

isRegistered in class SelectableChannel

Returns:

true if channel is registered

See Also:

isRegistered()

keyFor

public final SelectionKey keyFor(Selector selector)

Gets the selection key for the channel with the given selector.

Specified by:

keyFor in class SelectableChannel

Parameters:

selector - the selector with which this channel may register

Returns:

the selection key for the channel according to the given selector

See Also:

keyFor(java.nio.channels.Selector)

register

public final SelectionKey register(Selector selector,
                                   int interestSet,
                                   Object attachment)
                            throws ClosedChannelException

Realize the register function.

It registers current channel to the selector, then answer the selection key. The channel must be open and the interest op set must be valid. If the current channel is already registered to the selector, the method only set the new interest op set; otherwise it will call the register in selector, and add the relative key to the key set of the current channel.

Specified by:

register in class SelectableChannel

Parameters:

selector - the selector with which this channel shall be registered

interestSet - the interesting operation

attachment - The attached object, which can be null

Returns:

the selection key indicates the channel

Throws:

ClosedChannelException

See Also:

register(java.nio.channels.Selector, int, java.lang.Object)

implCloseChannel

protected final void implCloseChannel()
                               throws IOException

Implement the closing function.

Specified by:

implCloseChannel in class AbstractInterruptibleChannel

Throws:

IOException

See Also:

implCloseChannel()

implCloseSelectableChannel

protected abstract void implCloseSelectableChannel()
                                            throws IOException

Implement the closing function of the SelectableChannel.

Throws:

IOException - If some I/O exception occurred.

isBlocking

public final boolean isBlocking()

Returns if channel is in blocking mode.

Specified by:

isBlocking in class SelectableChannel

Returns:

true if channel is blocking

See Also:

isBlocking()

blockingLock

public final Object blockingLock()

Gets the blocking lock which synchronizes the configureBlocking and register methods.

Specified by:

blockingLock in class SelectableChannel

Returns:

the blocking object as lock

See Also:

blockingLock()

configureBlocking

public final SelectableChannel configureBlocking(boolean blockingMode)
                                          throws IOException

Set the blocking mode of this channel.

Specified by:

configureBlocking in class SelectableChannel

Parameters:

blockingMode - true for blocking mode; false for non-blocking mode.

Returns:

this channel

Throws:

IOException

See Also:

configureBlocking(boolean)

implConfigureBlocking

protected abstract void implConfigureBlocking(boolean flag)
                                       throws IOException

Throws:

IOException