1 /*
   2  * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.nio.ch;
  27 
  28 import java.nio.channels.CancelledKeyException;
  29 import java.nio.channels.SelectableChannel;
  30 import java.nio.channels.SelectionKey;
  31 import java.nio.channels.Selector;
  32 import java.nio.channels.spi.AbstractSelectionKey;
  33 
  34 
  35 /**
  36  * An implementation of SelectionKey for Solaris.
  37  */
  38 
  39 public class SelectionKeyImpl
  40     extends AbstractSelectionKey
  41 {
  42 
  43     final SelChImpl channel;                            // package-private
  44     public final SelectorImpl selector;
  45 
  46     // Index for a pollfd array in Selector that this key is registered with
  47     private int index;
  48 
  49     private volatile int interestOps;
  50     private volatile int readyOps;
  51 
  52     SelectionKeyImpl(SelChImpl ch, SelectorImpl sel) {
  53         channel = ch;
  54         selector = sel;
  55     }
  56 
  57     public SelectableChannel channel() {
  58         return (SelectableChannel)channel;
  59     }
  60 
  61     public Selector selector() {
  62         return selector;
  63     }
  64 
  65     int getIndex() {                                    // package-private
  66         return index;
  67     }
  68 
  69     void setIndex(int i) {                              // package-private
  70         index = i;
  71     }
  72 
  73     private void ensureValid() {
  74         if (!isValid())
  75             throw new CancelledKeyException();
  76     }
  77 
  78     public int interestOps() {
  79         ensureValid();
  80         return interestOps;
  81     }
  82 
  83     public SelectionKey interestOps(int ops) {
  84         ensureValid();
  85         return nioInterestOps(ops);
  86     }
  87 
  88     public int readyOps() {
  89         ensureValid();
  90         return readyOps;
  91     }
  92 
  93     // The nio versions of these operations do not care if a key
  94     // has been invalidated. They are for internal use by nio code.
  95 
  96     public void nioReadyOps(int ops) {
  97         readyOps = ops;
  98     }
  99 
 100     public int nioReadyOps() {
 101         return readyOps;
 102     }
 103 
 104     public SelectionKey nioInterestOps(int ops) {
 105         if ((ops & ~channel().validOps()) != 0)
 106             throw new IllegalArgumentException();
 107         channel.translateAndSetInterestOps(ops, this);
 108         interestOps = ops;
 109         return this;
 110     }
 111 
 112     public int nioInterestOps() {
 113         return interestOps;
 114     }
 115 
 116     @Override
 117     public String toString() {
 118         StringBuilder sb = new StringBuilder();
 119         sb.append("channel=")
 120           .append(channel)
 121           .append(", selector=")
 122           .append(selector);
 123         if (isValid()) {
 124             sb.append(", interestOps=")
 125               .append(interestOps)
 126               .append(", readyOps=")
 127               .append(readyOps);
 128         } else {
 129             sb.append(", invalid");
 130         }
 131         return sb.toString();
 132     }
 133 
 134 }