1 /*
2 * Copyright (c) 2007, 2010, 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 /*
25 * @test
26 * @bug 6450200
27 * @summary Test proper handling of pool state changes
28 * @run main/othervm ConfigChanges
29 * @author Martin Buchholz
30 */
31
32 import java.security.*;
33 import java.util.*;
34 import java.util.concurrent.*;
35 import java.util.concurrent.atomic.*;
36 import static java.util.concurrent.TimeUnit.*;
37
38 public class ConfigChanges {
39 static final ThreadGroup tg = new ThreadGroup("pool");
40
41 static final Random rnd = new Random();
42
43 static void report(ThreadPoolExecutor tpe) {
44 try {
45 System.out.printf(
46 "active=%d submitted=%d completed=%d queued=%d sizes=%d/%d/%d%n",
47 tg.activeCount(),
48 tpe.getTaskCount(),
49 tpe.getCompletedTaskCount(),
50 tpe.getQueue().size(),
51 tpe.getPoolSize(),
52 tpe.getCorePoolSize(),
53 tpe.getMaximumPoolSize());
54 } catch (Throwable t) { unexpected(t); }
55 }
56
57 static void report(String label, ThreadPoolExecutor tpe) {
58 System.out.printf("%10s ", label);
59 report(tpe);
60 }
61
62 static class PermissiveSecurityManger extends SecurityManager {
63 public void checkPermission(Permission p) { /* bien sur, Monsieur */ }
64 }
65
66 static void checkShutdown(final ExecutorService es) {
67 final Runnable nop = new Runnable() {public void run() {}};
68 try {
69 if (new Random().nextBoolean()) {
70 check(es.isShutdown());
71 if (es instanceof ThreadPoolExecutor)
72 check(((ThreadPoolExecutor) es).isTerminating()
73 || es.isTerminated());
74 THROWS(RejectedExecutionException.class,
75 new Fun() {void f() {es.execute(nop);}});
76 }
77 } catch (Throwable t) { unexpected(t); }
78 }
79
80 static void checkTerminated(final ThreadPoolExecutor tpe) {
81 try {
82 checkShutdown(tpe);
83 check(tpe.getQueue().isEmpty());
84 check(tpe.isTerminated());
85 check(! tpe.isTerminating());
86 equal(tpe.getActiveCount(), 0);
87 equal(tpe.getPoolSize(), 0);
88 equal(tpe.getTaskCount(), tpe.getCompletedTaskCount());
89 check(tpe.awaitTermination(0, SECONDS));
90 } catch (Throwable t) { unexpected(t); }
91 }
92
93 static Runnable waiter(final CyclicBarrier barrier) {
94 return new Runnable() { public void run() {
95 try { barrier.await(); barrier.await(); }
96 catch (Throwable t) { unexpected(t); }}};
97 }
98
99 static volatile Runnable runnableDuJour;
100
101 private static void realMain(String[] args) throws Throwable {
102 if (rnd.nextBoolean())
103 System.setSecurityManager(new PermissiveSecurityManger());
104
105 final boolean prestart = rnd.nextBoolean();
106
107 final Thread.UncaughtExceptionHandler handler
108 = new Thread.UncaughtExceptionHandler() {
109 public void uncaughtException(Thread t, Throwable e) {
110 check(! Thread.currentThread().isInterrupted());
111 unexpected(e);
112 }};
113
114 final int n = 3;
115 final ThreadPoolExecutor tpe
116 = new ThreadPoolExecutor(n, 3*n,
117 3L, MINUTES,
118 new ArrayBlockingQueue<Runnable>(3*n));
119 tpe.setThreadFactory(new ThreadFactory() {
120 public Thread newThread(Runnable r) {
121 Thread t = new Thread(tg, r);
122 t.setUncaughtExceptionHandler(handler);
123 return t;
124 }});
125
126 if (prestart) {
127 tpe.prestartAllCoreThreads();
128 equal(tg.activeCount(), n);
129 equal(tg.activeCount(), tpe.getCorePoolSize());
130 }
131
132 final Runnable runRunnableDuJour =
133 new Runnable() { public void run() {
134 // Delay choice of action till last possible moment.
135 runnableDuJour.run(); }};
136 final CyclicBarrier pumpedUp = new CyclicBarrier(3*n + 1);
137 runnableDuJour = waiter(pumpedUp);
138
139 if (prestart) {
140 for (int i = 0; i < 1*n; i++)
141 tpe.execute(runRunnableDuJour);
142 // Wait for prestarted threads to dequeue their initial tasks.
143 while (! tpe.getQueue().isEmpty())
144 Thread.sleep(10);
145 for (int i = 0; i < 5*n; i++)
146 tpe.execute(runRunnableDuJour);
147 } else {
148 for (int i = 0; i < 6*n; i++)
149 tpe.execute(runRunnableDuJour);
150 }
151
152 //report("submitted", tpe);
153 pumpedUp.await();
154 equal(tg.activeCount(), 3*n);
155 equal(tg.activeCount(), tpe.getMaximumPoolSize());
156 equal(tpe.getCorePoolSize(), n);
157 //report("pumped up", tpe);
158 equal(tpe.getMaximumPoolSize(), 3*n);
159 tpe.setMaximumPoolSize(4*n);
160 equal(tpe.getMaximumPoolSize(), 4*n);
161 //report("pumped up2", tpe);
162 final CyclicBarrier pumpedUp2 = new CyclicBarrier(n + 1);
163 runnableDuJour = waiter(pumpedUp2);
164 for (int i = 0; i < 1*n; i++)
165 tpe.execute(runRunnableDuJour);
166 pumpedUp2.await();
167 equal(tg.activeCount(), 4*n);
168 equal(tg.activeCount(), tpe.getMaximumPoolSize());
169 equal(tpe.getCompletedTaskCount(), 0L);
170 //report("pumped up2", tpe);
171 runnableDuJour = new Runnable() { public void run() {}};
172
173 tpe.setMaximumPoolSize(2*n);
174 //report("after set", tpe);
175
176 pumpedUp2.await();
177 pumpedUp.await();
178
179 // while (tg.activeCount() != n &&
180 // tg.activeCount() != n)
181 // Thread.sleep(10);
182 // equal(tg.activeCount(), n);
183 // equal(tg.activeCount(), tpe.getCorePoolSize());
184
185 while (tg.activeCount() != 2*n &&
186 tg.activeCount() != 2*n)
187 Thread.sleep(10);
188 equal(tg.activeCount(), 2*n);
189 equal(tg.activeCount(), tpe.getMaximumPoolSize());
190
191
192 //report("draining", tpe);
193 while (tpe.getCompletedTaskCount() < 7*n &&
194 tpe.getCompletedTaskCount() < 7*n)
195 Thread.sleep(10);
196
197 //equal(tg.activeCount(), n);
198 //equal(tg.activeCount(), tpe.getCorePoolSize());
199 equal(tg.activeCount(), 2*n);
200 equal(tg.activeCount(), tpe.getMaximumPoolSize());
201
202 equal(tpe.getTaskCount(), 7L*n);
203 equal(tpe.getCompletedTaskCount(), 7L*n);
204
205 equal(tpe.getKeepAliveTime(MINUTES), 3L);
206 tpe.setKeepAliveTime(7L, MILLISECONDS);
207 equal(tpe.getKeepAliveTime(MILLISECONDS), 7L);
208 while (tg.activeCount() > n &&
209 tg.activeCount() > n)
210 Thread.sleep(10);
211 equal(tg.activeCount(), n);
212
213 //report("idle", tpe);
214 check(! tpe.allowsCoreThreadTimeOut());
215 tpe.allowCoreThreadTimeOut(true);
216 check(tpe.allowsCoreThreadTimeOut());
217 while (tg.activeCount() > 0 &&
218 tg.activeCount() > 0)
219 Thread.sleep(10);
220 equal(tg.activeCount(), 0);
221
222 //report("idle", tpe);
223
224 tpe.shutdown();
225 checkShutdown(tpe);
226 check(tpe.awaitTermination(3L, MINUTES));
227 checkTerminated(tpe);
228 }
229
230 //--------------------- Infrastructure ---------------------------
231 static volatile int passed = 0, failed = 0;
232 static void pass() {passed++;}
233 static void fail() {failed++; Thread.dumpStack();}
234 static void fail(String msg) {System.out.println(msg); fail();}
235 static void unexpected(Throwable t) {failed++; t.printStackTrace();}
236 static void check(boolean cond) {if (cond) pass(); else fail();}
237 static void equal(Object x, Object y) {
238 if (x == null ? y == null : x.equals(y)) pass();
239 else fail(x + " not equal to " + y);}
240 public static void main(String[] args) throws Throwable {
241 try {realMain(args);} catch (Throwable t) {unexpected(t);}
242 System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
243 if (failed > 0) throw new AssertionError("Some tests failed");}
244 private abstract static class Fun {abstract void f() throws Throwable;}
245 static void THROWS(Class<? extends Throwable> k, Fun... fs) {
246 for (Fun f : fs)
247 try { f.f(); fail("Expected " + k.getName() + " not thrown"); }
248 catch (Throwable t) {
249 if (k.isAssignableFrom(t.getClass())) pass();
250 else unexpected(t);}}
251 }