Name
SelectableChannel
Synopsis
This abstract class defines the API for
channels that can be used with a Selector object
to allow a thread to block while waiting for activity on any of a
group of channels. All channel classes in the
java.nio.channels package except for
FileChannel are subclasses of
SelectableChannel.
A selectable channel may only be registered with a
Selector if it is nonblocking, so this class
defines the configureBlocking(
)
method. Pass false to this method to put a channel
into nonblocking mode, or pass true to make calls
to its read( )
and/or write( )
methods block. Use isBlocking( ) to determine the
current blocking mode of a selectable channel.
Register a SelectableChannel with a
Selector by calling the register(
)
method of the channel (not
of the selector). There are two versions of this method: both take a
Selector object and a bitmask that specifies the
set of channel operations that are to be
“selected” on that channel. (see
SelectionKey for the constants that can be OR-ed
together to form this bitmask). Both methods return a
SelectionKey object that represents the
registration of the channel with the selector. One version of the
register( ) method also takes an arbitrary object
argument which serves as an
“attachment” to the
SelectionKey and allows you to associate arbitrary
data with it. The validOps( ) method returns a
bitmask that specifies the set of operations that a particular
channel object allows to be selected. The bitmask
passed to register( ...
Get Java in a Nutshell, 5th Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
