AbstractSelectableChannel (Java Platform SE 6) function windowTitle() { if (location.href.indexOf('is-external=true') == -1) { parent.document.title="AbstractSelectableChannel (Java Platform SE 6)"; } } Overview  Package   Class  Use  Tree  Deprecated  Index  Help  Java™ PlatformStandard Ed. 6  PREV CLASS   NEXT CLASS FRAMES    NO FRAMES     All Classes SUMMARY: NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD 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 AbstractSelectableChannelextends SelectableChannel Base implementation class for selectable channels. This class defines methods that handle the mechanics of channel registration, deregistration, and closing. It maintains the current blocking mode of this channel as well as its current set of selection keys. It performs all of the synchronization required to implement the SelectableChannel specification. Implementations of the abstract protected methods defined in this class need not synchronize against other threads that might be engaged in the same operations. Since: 1.4 Constructor Summary protected AbstractSelectableChannel(SelectorProvider provider)           Initializes a new instance of this class.   Method Summary  Object blockingLock()           Retrieves the object upon which the configureBlocking and register methods synchronize.  SelectableChannel configureBlocking(boolean block)           Adjusts this channel's blocking mode. protected  void implCloseChannel()           Closes this channel. protected abstract  void implCloseSelectableChannel()           Closes this selectable channel. protected abstract  void implConfigureBlocking(boolean block)           Adjusts this channel's blocking mode.  boolean isBlocking()           Tells whether or not every I/O operation on this channel will block until it completes.  boolean isRegistered()           Tells whether or not this channel is currently registered with any selectors.  SelectionKey keyFor(Selector sel)           Retrieves the key representing the channel's registration with the given selector.  SelectorProvider provider()           Returns the provider that created this channel.  SelectionKey register(Selector sel, int ops, Object att)           Registers this channel with the given selector, returning a selection key.   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 provider) Initializes a new instance of this class. Method Detail provider public final SelectorProvider provider() Returns the provider that created this channel. Specified by:provider in class SelectableChannel Returns:The provider that created this channel isRegistered public final boolean isRegistered() Description copied from class: SelectableChannel Tells whether or not this channel is currently registered with any selectors. A newly-created channel is not registered. Due to the inherent delay between key cancellation and channel deregistration, a channel may remain registered for some time after all of its keys have been cancelled. A channel may also remain registered for some time after it is closed. Specified by:isRegistered in class SelectableChannel Returns:true if, and only if, this channel is registered keyFor public final SelectionKey keyFor(Selector sel) Description copied from class: SelectableChannel Retrieves the key representing the channel's registration with the given selector. Specified by:keyFor in class SelectableChannel Returns:The key returned when this channel was last registered with the given selector, or null if this channel is not currently registered with that selector register public final SelectionKey register(Selector sel, int ops, Object att) throws ClosedChannelException Registers this channel with the given selector, returning a selection key. This method first verifies that this channel is open and that the given initial interest set is valid. If this channel is already registered with the given selector then the selection key representing that registration is returned after setting its interest set to the given value. Otherwise this channel has not yet been registered with the given selector, so the register method of the selector is invoked while holding the appropriate locks. The resulting key is added to this channel's key set before being returned. Specified by:register in class SelectableChannel Parameters:sel - The selector with which this channel is to be registeredops - The interest set for the resulting keyatt - The attachment for the resulting key; may be null Returns:A key representing the registration of this channel with the given selector Throws: ClosedChannelException - If this channel is closed implCloseChannel protected final void implCloseChannel() throws IOException Closes this channel. This method, which is specified in the AbstractInterruptibleChannel class and is invoked by the close method, in turn invokes the implCloseSelectableChannel method in order to perform the actual work of closing this channel. It then cancels all of this channel's keys. Specified by:implCloseChannel in class AbstractInterruptibleChannel Throws: IOException - If an I/O error occurs while closing the channel implCloseSelectableChannel protected abstract void implCloseSelectableChannel() throws IOException Closes this selectable channel. This method is invoked by the close method in order to perform the actual work of closing the channel. This method is only invoked if the channel has not yet been closed, and it is never invoked more than once. An implementation of this method must arrange for any other thread that is blocked in an I/O operation upon this channel to return immediately, either by throwing an exception or by returning normally. Throws: IOException isBlocking public final boolean isBlocking() Description copied from class: SelectableChannel Tells whether or not every I/O operation on this channel will block until it completes. A newly-created channel is always in blocking mode. If this channel is closed then the value returned by this method is not specified. Specified by:isBlocking in class SelectableChannel Returns:true if, and only if, this channel is in blocking mode blockingLock public final Object blockingLock() Description copied from class: SelectableChannel Retrieves the object upon which the configureBlocking and register methods synchronize. This is often useful in the implementation of adaptors that require a specific blocking mode to be maintained for a short period of time. Specified by:blockingLock in class SelectableChannel Returns:The blocking-mode lock object configureBlocking public final SelectableChannel configureBlocking(boolean block) throws IOException Adjusts this channel's blocking mode. If the given blocking mode is different from the current blocking mode then this method invokes the implConfigureBlocking method, while holding the appropriate locks, in order to change the mode. Specified by:configureBlocking in class SelectableChannel Parameters:block - If true then this channel will be placed in blocking mode; if false then it will be placed non-blocking mode Returns:This selectable channel Throws: ClosedChannelException - If this channel is closed IOException - If an I/O error occurs implConfigureBlocking protected abstract void implConfigureBlocking(boolean block) throws IOException Adjusts this channel's blocking mode. This method is invoked by the configureBlocking method in order to perform the actual work of changing the blocking mode. This method is only invoked if the new mode is different from the current mode. Throws: IOException - If an I/O error occurs Overview  Package   Class  Use  Tree  Deprecated  Index  Help  Java™ PlatformStandard Ed. 6  PREV CLASS   NEXT CLASS FRAMES    NO FRAMES     All Classes SUMMARY: NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD Submit a bug or featureFor further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. Copyright 2009 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.

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