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.lang.invoke.ConstantBootstraps;
29 import java.lang.invoke.MethodHandles;
30 import java.lang.invoke.VarHandle;
31 import java.nio.channels.CancelledKeyException;
32 import java.nio.channels.SelectableChannel;
33 import java.nio.channels.SelectionKey;
34 import java.nio.channels.Selector;
35 import java.nio.channels.spi.AbstractSelectionKey;
36
37
38 /**
39 * An implementation of SelectionKey.
40 */
41
42 public final class SelectionKeyImpl
43 extends AbstractSelectionKey
44 {
45 private static final VarHandle INTERESTOPS =
46 ConstantBootstraps.fieldVarHandle(
47 MethodHandles.lookup(),
48 "interestOps",
49 VarHandle.class,
50 SelectionKeyImpl.class, int.class);
51
52 private final SelChImpl channel;
53 private final SelectorImpl selector;
54
55 private volatile int interestOps;
56 private volatile int readyOps;
57
58 // registered events in kernel, used by some Selector implementations
59 private int registeredEvents;
60
61 // index of key in pollfd array, used by some Selector implementations
62 private int index;
63
64 SelectionKeyImpl(SelChImpl ch, SelectorImpl sel) {
65 channel = ch;
66 selector = sel;
67 }
68
69 private void ensureValid() {
70 if (!isValid())
71 throw new CancelledKeyException();
72 }
73
74 int getFDVal() {
75 return channel.getFDVal();
76 }
77
78 @Override
79 public SelectableChannel channel() {
80 return (SelectableChannel)channel;
81 }
82
83 @Override
84 public Selector selector() {
85 return selector;
86 }
87
88 @Override
89 public int interestOps() {
90 ensureValid();
91 return interestOps;
92 }
93
94 @Override
95 public SelectionKey interestOps(int ops) {
96 ensureValid();
97 if ((ops & ~channel().validOps()) != 0)
98 throw new IllegalArgumentException();
99 int oldOps = (int) INTERESTOPS.getAndSet(this, ops);
100 if (ops != oldOps) {
101 selector.setEventOps(this);
102 }
103 return this;
104 }
105
106 @Override
107 public int interestOpsOr(int ops) {
108 ensureValid();
109 if ((ops & ~channel().validOps()) != 0)
110 throw new IllegalArgumentException();
111 int oldVal = (int) INTERESTOPS.getAndBitwiseOr(this, ops);
112 if (oldVal != (oldVal | ops)) {
113 selector.setEventOps(this);
114 }
115 return oldVal;
116 }
117
118 @Override
119 public int interestOpsAnd(int ops) {
120 ensureValid();
121 int oldVal = (int) INTERESTOPS.getAndBitwiseAnd(this, ops);
122 if (oldVal != (oldVal & ops)) {
123 selector.setEventOps(this);
124 }
125 return oldVal;
126 }
127
128 @Override
129 public int readyOps() {
130 ensureValid();
131 return readyOps;
132 }
133
134 // The nio versions of these operations do not care if a key
135 // has been invalidated. They are for internal use by nio code.
136
137 public void nioReadyOps(int ops) {
138 readyOps = ops;
139 }
140
141 public int nioReadyOps() {
142 return readyOps;
143 }
144
145 public SelectionKey nioInterestOps(int ops) {
146 if ((ops & ~channel().validOps()) != 0)
147 throw new IllegalArgumentException();
148 interestOps = ops;
149 selector.setEventOps(this);
150 return this;
151 }
152
153 public int nioInterestOps() {
154 return interestOps;
155 }
156
157 int translateInterestOps() {
158 return channel.translateInterestOps(interestOps);
159 }
160
161 boolean translateAndSetReadyOps(int ops) {
162 return channel.translateAndSetReadyOps(ops, this);
163 }
164
165 boolean translateAndUpdateReadyOps(int ops) {
166 return channel.translateAndUpdateReadyOps(ops, this);
167 }
168
169 void registeredEvents(int events) {
170 // assert Thread.holdsLock(selector);
171 this.registeredEvents = events;
172 }
173
174 int registeredEvents() {
175 // assert Thread.holdsLock(selector);
176 return registeredEvents;
177 }
178
179 int getIndex() {
180 return index;
181 }
182
183 void setIndex(int i) {
184 index = i;
185 }
186
187 @Override
188 public String toString() {
189 StringBuilder sb = new StringBuilder();
190 sb.append("channel=")
191 .append(channel)
192 .append(", selector=")
193 .append(selector);
194 if (isValid()) {
195 sb.append(", interestOps=")
196 .append(interestOps)
197 .append(", readyOps=")
198 .append(readyOps);
199 } else {
200 sb.append(", invalid");
201 }
202 return sb.toString();
203 }
204
205 // used by Selector implementations to record when the key was selected
206 int lastPolled;
207 }