/*
* Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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*/
/*
* @test
* @bug 6522773
* @summary Test changes to STPE core pool size
* @author Martin Buchholz
*/
import java.util.concurrent.*;
public class ModifyCorePoolSize {
static void awaitPoolSize(ThreadPoolExecutor pool, int n) {
while (pool.getPoolSize() != n) Thread.yield();
pass();
}
static void setCorePoolSize(ThreadPoolExecutor pool, int n) {
pool.setCorePoolSize(n);
equal(pool.getCorePoolSize(), n);
awaitPoolSize(pool, n);
}
static void realMain(String[] args) throws Throwable {
final int size = 10;
final ScheduledThreadPoolExecutor pool
= new ScheduledThreadPoolExecutor(size);
final Runnable nop = new Runnable() { public void run() {}};
for (int i = 0; i < size; i++)
pool.scheduleAtFixedRate(nop, 100L * (i + 1),
1000L, TimeUnit.MILLISECONDS);
awaitPoolSize(pool, size);
setCorePoolSize(pool, size - 3);
setCorePoolSize(pool, size + 3);
pool.shutdownNow();
check(pool.awaitTermination(1L, TimeUnit.DAYS));
}
//--------------------- Infrastructure ---------------------------
static volatile int passed = 0, failed = 0;
static void pass() {passed++;}
static void fail() {failed++; Thread.dumpStack();}
static void fail(String msg) {System.out.println(msg); fail();}
static void unexpected(Throwable t) {failed++; t.printStackTrace();}
static void check(boolean cond) {if (cond) pass(); else fail();}
static void equal(Object x, Object y) {
if (x == null ? y == null : x.equals(y)) pass();
else fail(x + " not equal to " + y);}
public static void main(String[] args) throws Throwable {
try {realMain(args);} catch (Throwable t) {unexpected(t);}
System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
if (failed > 0) throw new AssertionError("Some tests failed");}
}