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/*
* Copyright (c) 2007, 2021, 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.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @key stress randomness
*
* @summary converted from VM Testbase gc/gctests/StringInternGC.
* VM Testbase keywords: [gc, stress, stressopt, nonconcurrent, quick]
*
* @library /vmTestbase
* /test/lib
* @run main/othervm -XX:+ExplicitGCInvokesConcurrent gc.gctests.StringInternGC.StringInternGC
*/
package gc.gctests.StringInternGC;
import nsk.share.test.*;
import nsk.share.gc.*;
/**
* Test that strings returned by String.intern() can be collected.
*
* Create strings consisting of random characters, call String.intern().
* String pool should not overflow.
*/
public class StringInternGC extends ThreadedGCTest {
private int maxLength = 1000; // Maximum number of characters to add per operation.
private int maxTotalLength = 128 * 1024; // Total maximum length of the string until a new StringBuffer will be allocated.
private long lastTime = System.currentTimeMillis();
private class StringGenerator implements Runnable {
private StringBuffer sb = new StringBuffer();
private String generateString() {
int length = LocalRandom.nextInt(maxLength);
if (sb.length() > maxTotalLength) {
sb = new StringBuffer();
}
for (int i = 0; i < length; ++i)
sb.append((char) LocalRandom.nextInt(Integer.MAX_VALUE));
return sb.toString();
}
public void run() {
long currentTime = System.currentTimeMillis();
if (currentTime - lastTime > 5000) { // Cause a full gc every 5s.
lastTime = currentTime;
System.gc();
}
generateString().intern();
}
}
protected Runnable createRunnable(int i) {
return new StringGenerator();
}
public static void main(String[] args) {
GC.runTest(new StringInternGC(), args);
}
}
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