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