1 /*
2  * Copyright (c) 2003, 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.
8  *
9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  */
23 
24 /* @test
25  * @bug 4776783 4778091 4778099
26  * @summary Check various properties of key and selected-key sets
27  *
28  * @run main KeySets
29  * @run main/othervm -Dsun.nio.ch.bugLevel=1.4 KeySets
30  */
31 
32 import java.io.*;
33 import java.nio.channels.*;
34 import java.util.*;
35 
36 
37 public class KeySets {
38 
39     static boolean compat;
40 
41     static abstract class Catch {
go()42         abstract void go() throws Exception;
Catch(Class xc)43         Catch(Class xc) throws Exception {
44             try {
45                 go();
46             } catch (Exception x) {
47                 if (compat)
48                     throw new Exception("Exception thrown", x);
49                 if (xc.isInstance(x))
50                     return;
51                 throw new Exception("Wrong exception", x);
52             }
53             if (compat)
54                 return;
55             throw new Exception("Not thrown as expected: "
56                                 + xc.getName());
57         }
58     }
59 
60     // 4776783: Closing a selector should make key sets inaccessible
testClose()61     static void testClose() throws Exception {
62 
63         final Selector sel = Selector.open();
64         sel.keys();
65         sel.selectedKeys();
66         sel.close();
67 
68         new Catch(ClosedSelectorException.class) {
69                 void go() throws Exception {
70                     sel.keys();
71                 }};
72 
73         new Catch(ClosedSelectorException.class) {
74                 void go() throws Exception {
75                     sel.selectedKeys();
76                 }};
77 
78     }
79 
testNoAddition(final Set s)80     static void testNoAddition(final Set s) throws Exception {
81         new Catch(UnsupportedOperationException.class) {
82                 void go() throws Exception {
83                     s.add(new Object());
84                 }};
85         new Catch(UnsupportedOperationException.class) {
86                 void go() throws Exception {
87                     ArrayList al = new ArrayList();
88                     al.add(new Object());
89                     s.addAll(al);
90                 }};
91     }
92 
93     static interface Adder {
add()94         void add() throws IOException;
95     }
96 
testNoRemoval(final Set s, final Adder adder)97     static void testNoRemoval(final Set s, final Adder adder)
98         throws Exception
99     {
100         new Catch(UnsupportedOperationException.class) {
101                 void go() throws Exception {
102                     adder.add();
103                     s.clear();
104                 }};
105         new Catch(UnsupportedOperationException.class) {
106                 void go() throws Exception {
107                     adder.add();
108                     Iterator i = s.iterator();
109                     i.next();
110                     i.remove();
111                 }};
112         new Catch(UnsupportedOperationException.class) {
113                 void go() throws Exception {
114                     adder.add();
115                     s.remove(s.iterator().next());
116                 }};
117         new Catch(UnsupportedOperationException.class) {
118                 void go() throws Exception {
119                     adder.add();
120                     HashSet hs = new HashSet();
121                     hs.addAll(s);
122                     s.removeAll(hs);
123                 }};
124         new Catch(UnsupportedOperationException.class) {
125                 void go() throws Exception {
126                     adder.add();
127                     s.retainAll(Collections.EMPTY_SET);
128                 }};
129     }
130 
reg(Selector sel)131     static SelectionKey reg(Selector sel) throws IOException {
132         DatagramChannel dc = DatagramChannel.open();
133         dc.configureBlocking(false);
134         return dc.register(sel, SelectionKey.OP_WRITE);
135     }
136 
testMutability()137     static void testMutability() throws Exception {
138 
139         final Selector sel = Selector.open();
140 
141         // 4778091: Selector.keys() should be immutable
142 
143         testNoRemoval(sel.keys(), new Adder() {
144                 public void add() throws IOException {
145                     reg(sel);
146                 }
147             });
148         testNoAddition(sel.keys());
149 
150         // 4778099: Selector.selectedKeys() should allow removal but not addition
151 
152         sel.select();
153         testNoAddition(sel.selectedKeys());
154         SelectionKey sk = reg(sel);
155         sel.select();
156         int n = sel.selectedKeys().size();
157         sel.selectedKeys().remove(sk);
158         if (sel.selectedKeys().size() != n - 1)
159             throw new Exception("remove failed");
160 
161         HashSet hs = new HashSet();
162         hs.add(reg(sel));
163         sel.select();
164         sel.selectedKeys().retainAll(hs);
165         if (sel.selectedKeys().isEmpty())
166             throw new Exception("retainAll failed");
167         sel.selectedKeys().removeAll(hs);
168         if (!sel.selectedKeys().isEmpty())
169             throw new Exception("removeAll failed");
170 
171         hs.clear();
172         hs.add(reg(sel));
173         sel.select();
174         sel.selectedKeys().clear();
175         if (!sel.selectedKeys().isEmpty())
176             throw new Exception("clear failed");
177 
178     }
179 
main(String[] args)180     public static void main(String[] args) throws Exception {
181         String bl = System.getProperty("sun.nio.ch.bugLevel");
182         compat = (bl != null) && bl.equals("1.4");
183         testClose();
184         testMutability();
185     }
186 
187 }
188