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jeremybenn |
/* SelectableChannel.java --
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Copyright (C) 2002 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.nio.channels;
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import java.io.IOException;
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import java.nio.channels.spi.AbstractInterruptibleChannel;
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import java.nio.channels.spi.SelectorProvider;
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/**
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* @author Michael Koch
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* @since 1.4
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*/
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public abstract class SelectableChannel extends AbstractInterruptibleChannel
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{
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/**
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* Initializes the channel.
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*/
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protected SelectableChannel()
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{
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}
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/**
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* Returns the lock of this channel.
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*/
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public abstract Object blockingLock();
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/**
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* Adjusts this channel's blocking mode.
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*
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* @exception ClosedChannelException If this channel is closed.
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* @exception IllegalBlockingModeException If block is true and this channel
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* is registered with one or more selectors.
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* @exception IOException If an error occurs.
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*/
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public abstract SelectableChannel configureBlocking(boolean block)
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throws IOException;
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/**
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* Tells whether this channel is blocking or not.
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*/
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public abstract boolean isBlocking();
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/**
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* Tells whether or not this channel is currently registered with
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* any selectors.
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*/
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public abstract boolean isRegistered();
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/**
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* Retrieves the key representing the channel's registration with
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* the given selector.
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*/
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public abstract SelectionKey keyFor(Selector sel);
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/**
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* Returns the provider that created this channel.
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*/
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public abstract SelectorProvider provider();
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/**
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* Registers this channel with the given selector,
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* returning a selection key.
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*
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* @exception CancelledKeyException If this channel is currently registered
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* with the given selector but the corresponding key has already been cancelled
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* @exception ClosedChannelException If this channel is closed.
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* @exception IllegalArgumentException If a bit in ops does not correspond
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* to an operation that is supported by this channel, that is, if
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* set & ~validOps() != 0.
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* @exception IllegalBlockingModeException If block is true and this channel
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* is registered with one or more selectors.
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* @exception IllegalSelectorException If this channel was not created by
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* the same provider as the given selector.
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*/
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public final SelectionKey register(Selector sel, int ops)
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throws ClosedChannelException
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{
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return register(sel, ops, null);
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}
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/**
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* Registers this channel with the given selector,
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* returning a selection key.
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*
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* @exception CancelledKeyException If this channel is currently registered
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* with the given selector but the corresponding key has already been
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* cancelled.
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* @exception ClosedChannelException If this channel is closed.
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* @exception IllegalArgumentException If a bit in ops does not correspond
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* to an operation that is supported by this channel, that is, if
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* set & ~validOps() != 0.
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* @exception IllegalBlockingModeException If block is true and this channel
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* is registered with one or more selectors.
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* @exception IllegalSelectorException If this channel was not created by
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* the same provider as the given selector.
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*/
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public abstract SelectionKey register(Selector sel, int ops, Object att)
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throws ClosedChannelException;
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/**
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* Returns a set of valid operations on this channel.
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*/
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public abstract int validOps();
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}
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