- java.lang.Object
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- java.nio.channels.spi.AbstractInterruptibleChannel
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- java.nio.channels.SelectableChannel
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- java.nio.channels.spi.AbstractSelectableChannel
 
 
 
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- All Implemented Interfaces:
- Closeable,- AutoCloseable,- Channel,- InterruptibleChannel
 - Direct Known Subclasses:
- DatagramChannel,- Pipe.SinkChannel,- Pipe.SourceChannel,- SctpChannel,- SctpMultiChannel,- SctpServerChannel,- ServerSocketChannel,- SocketChannel
 
 public abstract class AbstractSelectableChannel extends 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 SelectableChannelspecification. 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
 
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Constructor SummaryConstructors Modifier Constructor Description protectedAbstractSelectableChannel(SelectorProvider provider)Initializes a new instance of this class.
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Method SummaryAll Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description SelectableChannelconfigureBlocking(boolean block)Adjusts this channel's blocking mode.protected voidimplCloseChannel()Closes this channel.protected abstract voidimplCloseSelectableChannel()Closes this selectable channel.protected abstract voidimplConfigureBlocking(boolean block)Adjusts this channel's blocking mode.SelectorProviderprovider()Returns the provider that created this channel.SelectionKeyregister(Selector sel, int ops, Object att)Registers this channel with the given selector, returning a selection key.- 
Methods declared in class java.nio.channels.SelectableChannelblockingLock, isBlocking, isRegistered, keyFor, register, validOps
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Methods declared in class java.nio.channels.spi.AbstractInterruptibleChannelbegin, close, end
 
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Constructor Detail- 
AbstractSelectableChannelprotected AbstractSelectableChannel(SelectorProvider provider) Initializes a new instance of this class.- Parameters:
- provider- The provider that created this channel
 
 
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Method Detail- 
providerpublic final SelectorProvider provider() Returns the provider that created this channel.- Specified by:
- providerin class- SelectableChannel
- Returns:
- The provider that created this channel
 
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registerpublic 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 registermethod 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:
- registerin class- SelectableChannel
- Parameters:
- sel- The selector with which this channel is to be registered
- ops- The interest set for the resulting key
- att- The attachment for the resulting key; may be- null
- Returns:
- A key representing the registration of this channel with the given selector
- Throws:
- ClosedSelectorException- If the selector is closed
- IllegalBlockingModeException- If this channel is in blocking mode
- IllegalSelectorException- If this channel was not created by the same provider as the given selector
- CancelledKeyException- If this channel is currently registered with the given selector but the corresponding key has already been cancelled
- IllegalArgumentException- If a bit in the- opsset does not correspond to an operation that is supported by this channel, that is, if- set & ~validOps() != 0
- ClosedChannelException- If this channel is closed
 
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implCloseChannelprotected final void implCloseChannel() throws IOExceptionCloses this channel.This method, which is specified in the AbstractInterruptibleChannelclass and is invoked by theclosemethod, in turn invokes theimplCloseSelectableChannelmethod in order to perform the actual work of closing this channel. It then cancels all of this channel's keys.- Specified by:
- implCloseChannelin class- AbstractInterruptibleChannel
- Throws:
- IOException- If an I/O error occurs while closing the channel
 
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implCloseSelectableChannelprotected abstract void implCloseSelectableChannel() throws IOExceptionCloses this selectable channel.This method is invoked by the closemethod 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- If an I/O error occurs
 
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configureBlockingpublic 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 implConfigureBlockingmethod, while holding the appropriate locks, in order to change the mode.- Specified by:
- configureBlockingin class- SelectableChannel
- Parameters:
- block- If- truethen this channel will be placed in blocking mode; if- falsethen 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
 
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implConfigureBlockingprotected abstract void implConfigureBlocking(boolean block) throws IOExceptionAdjusts this channel's blocking mode.This method is invoked by the configureBlockingmethod 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.- Parameters:
- block- If- truethen this channel will be placed in blocking mode; if- falsethen it will be placed non-blocking mode
- Throws:
- IOException- If an I/O error occurs
 
 
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