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jeremybenn |
/* Selector.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.SelectorProvider;
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import java.util.Set;
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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 Selector
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{
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/**
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* Initializes the selector.
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*/
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protected Selector()
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{
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}
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/**
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* Opens a selector.
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*
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* @exception IOException If an error occurs
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*/
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public static Selector open() throws IOException
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{
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return SelectorProvider.provider().openSelector();
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}
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/**
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* Closes the selector.
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*
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* @exception IOException If an error occurs
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*/
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public abstract void close() throws IOException;
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/**
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* Tells whether the selector is open or not.
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*/
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public abstract boolean isOpen();
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/**
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* Returns this selector's key set.
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*
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* @exception ClosedSelectorException If this selector is closed.
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*/
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public abstract Set<SelectionKey> keys();
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/**
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* Returns the SelectorProvider that created the selector.
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*/
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public abstract SelectorProvider provider();
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/**
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* Selects a set of keys whose corresponding channels are ready
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* for I/O operations.
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*
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* @exception ClosedSelectorException If this selector is closed.
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* @exception IOException If an error occurs
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*/
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public abstract int select() throws IOException;
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/**
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* Selects a set of keys whose corresponding channels are ready
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* for I/O operations.
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*
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* @param timeout The timeout to use.
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*
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* @exception ClosedSelectorException If this selector is closed.
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* @exception IllegalArgumentException If the timeout value is negative.
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* @exception IOException If an error occurs
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*/
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public abstract int select(long timeout) throws IOException;
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/**
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* Returns this selector's selected-key set.
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*
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* @exception ClosedSelectorException If this selector is closed.
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*/
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public abstract Set<SelectionKey> selectedKeys();
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/**
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* Selects a set of keys whose corresponding channels are ready
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* for I/O operations.
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*
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* @exception ClosedSelectorException If this selector is closed.
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* @exception IOException If an error occurs
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*/
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public abstract int selectNow() throws IOException;
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/**
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* Causes the first selection operation that has not yet returned to
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* return immediately.
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*/
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public abstract Selector wakeup();
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}
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