1/*
2 * Copyright (c) 2007, 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 6522773
27 * @summary Test changes to STPE core pool size
28 * @author Martin Buchholz
29 */
30
31import java.util.concurrent.ScheduledThreadPoolExecutor;
32import java.util.concurrent.ThreadPoolExecutor;
33import java.util.concurrent.TimeUnit;
34
35public class ModifyCorePoolSize {
36    static void awaitPoolSize(ThreadPoolExecutor pool, int n) {
37        while (pool.getPoolSize() != n) Thread.yield();
38        pass();
39    }
40
41    static void setCorePoolSize(ThreadPoolExecutor pool, int n) {
42        pool.setCorePoolSize(n);
43        equal(pool.getCorePoolSize(), n);
44        awaitPoolSize(pool, n);
45    }
46
47    static void realMain(String[] args) throws Throwable {
48        final int size = 10;
49        final ScheduledThreadPoolExecutor pool
50            = new ScheduledThreadPoolExecutor(size);
51        final Runnable nop = new Runnable() { public void run() {}};
52
53        for (int i = 0; i < size; i++)
54            pool.scheduleAtFixedRate(nop, 100L * (i + 1),
55                                     1000L, TimeUnit.MILLISECONDS);
56        awaitPoolSize(pool, size);
57        setCorePoolSize(pool, size - 3);
58        setCorePoolSize(pool, size + 3);
59        pool.shutdownNow();
60        check(pool.awaitTermination(1L, TimeUnit.DAYS));
61    }
62
63    //--------------------- Infrastructure ---------------------------
64    static volatile int passed = 0, failed = 0;
65    static void pass() {passed++;}
66    static void fail() {failed++; Thread.dumpStack();}
67    static void fail(String msg) {System.out.println(msg); fail();}
68    static void unexpected(Throwable t) {failed++; t.printStackTrace();}
69    static void check(boolean cond) {if (cond) pass(); else fail();}
70    static void equal(Object x, Object y) {
71        if (x == null ? y == null : x.equals(y)) pass();
72        else fail(x + " not equal to " + y);}
73    public static void main(String[] args) throws Throwable {
74        try {realMain(args);} catch (Throwable t) {unexpected(t);}
75        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
76        if (failed > 0) throw new AssertionError("Some tests failed");}
77}
78