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Java™ Platform Standard Ed. 6 |
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java.lang.Object java.nio.channels.spi.AbstractInterruptibleChannel java.nio.channels.SelectableChannel java.nio.channels.spi.AbstractSelectableChannel java.nio.channels.ServerSocketChannel
public abstract class ServerSocketChannel
A selectable channel for stream-oriented listening sockets.
Server-socket channels are not a complete abstraction of listening
network sockets. Binding and the manipulation of socket options must be
done through an associated ServerSocket
object obtained by
invoking the socket
method. It is not possible to create
a channel for an arbitrary, pre-existing server socket, nor is it possible
to specify the SocketImpl
object to be used by a server
socket associated with a server-socket channel.
A server-socket channel is created by invoking the open
method of this class. A newly-created server-socket channel is open but not
yet bound. An attempt to invoke the accept
method of an
unbound server-socket channel will cause a NotYetBoundException
to
be thrown. A server-socket channel can be bound by invoking one of the
bind
methods
of an associated server socket.
Server-socket channels are safe for use by multiple concurrent threads.
Constructor Summary | |
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protected |
ServerSocketChannel(SelectorProvider provider)
Initializes a new instance of this class. |
Method Summary | |
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abstract SocketChannel |
accept()
Accepts a connection made to this channel's socket. |
static ServerSocketChannel |
open()
Opens a server-socket channel. |
abstract ServerSocket |
socket()
Retrieves a server socket associated with this channel. |
int |
validOps()
Returns an operation set identifying this channel's supported operations. |
Methods inherited from class java.nio.channels.spi.AbstractSelectableChannel |
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blockingLock, configureBlocking, implCloseChannel, implCloseSelectableChannel, implConfigureBlocking, isBlocking, isRegistered, keyFor, provider, register |
Methods inherited from class java.nio.channels.SelectableChannel |
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register |
Methods inherited from class java.nio.channels.spi.AbstractInterruptibleChannel |
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begin, close, end, isOpen |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface java.nio.channels.Channel |
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close, isOpen |
Constructor Detail |
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protected ServerSocketChannel(SelectorProvider provider)
Method Detail |
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public static ServerSocketChannel open() throws IOException
The new channel is created by invoking the openServerSocketChannel
method of the system-wide default SelectorProvider
object.
The new channel's socket is initially unbound; it must be bound to a
specific address via one of its socket's bind
methods before
connections can be accepted.
IOException
- If an I/O error occurspublic final int validOps()
Server-socket channels only support the accepting of new
connections, so this method returns SelectionKey.OP_ACCEPT
.
validOps
in class SelectableChannel
public abstract ServerSocket socket()
The returned object will not declare any public methods that are not
declared in the ServerSocket
class.
public abstract SocketChannel accept() throws IOException
If this channel is in non-blocking mode then this method will immediately return null if there are no pending connections. Otherwise it will block indefinitely until a new connection is available or an I/O error occurs.
The socket channel returned by this method, if any, will be in blocking mode regardless of the blocking mode of this channel.
This method performs exactly the same security checks as the accept
method of the ServerSocket
class. That is, if a security manager has been
installed then for each new connection this method verifies that the
address and port number of the connection's remote endpoint are
permitted by the security manager's checkAccept
method.
ClosedChannelException
- If this channel is closed
AsynchronousCloseException
- If another thread closes this channel
while the accept operation is in progress
ClosedByInterruptException
- If another thread interrupts the current thread
while the accept operation is in progress, thereby
closing the channel and setting the current thread's
interrupt status
NotYetBoundException
- If this channel's socket has not yet been bound
SecurityException
- If a security manager has been installed
and it does not permit access to the remote endpoint
of the new connection
IOException
- If some other I/O error occurs
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Java™ Platform Standard Ed. 6 |
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