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/*
* Copyright (c) 2017, 2018, 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.
*/
package gc.gctests.StringInternSyncWithGC;
import java.lang.ref.Reference;
import java.lang.ref.SoftReference;
import java.lang.ref.WeakReference;
import java.util.List;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import nsk.share.TestBug;
import nsk.share.TestFailure;
import nsk.share.gc.gp.string.RandomStringProducer;
import nsk.share.test.ExecutionController;
import nsk.share.test.LocalRandom;
class StringGenerator implements Runnable {
private final RandomStringProducer gp;
private final List<String> stringsToIntern;
private final int threadNumber;
private final int numberOfActions;
private final int maxStringSize;
private final StringInternSyncWithGC base;
private static final ReadWriteLock RWLOCK = new ReentrantReadWriteLock();
public StringGenerator(int threadId, StringInternSyncWithGC base) {
this.base = base;
threadNumber = threadId;
stringsToIntern = base.getStringsToIntern();
numberOfActions = base.getNumberOfThreads() > 4 ? base.getNumberOfThreads() : 4;
gp = base.getGarbageProducer();
maxStringSize = base.getMaxStringSize();
}
/* This field is public just to be not optimized */
public String copy;
@Override
public void run() {
ExecutionController stresser = base.getExecController();
try {
RWLOCK.readLock().lock();
Object[] refToInterned = new Object[stringsToIntern.size()];
for (int i = 0; i < stringsToIntern.size(); i++) {
if (!stresser.continueExecution()) {
return;
}
int index = LocalRandom.nextInt(stringsToIntern.size());
String str = stringsToIntern.get(index);
int action = LocalRandom.nextInt(numberOfActions);
/* We want to provoke a lot of collections for each interned copy
* so map should be "sparse".
*/
copy = new String(str);
switch (action) {
case 0:
refToInterned[index] = copy.intern();
break;
case 1:
refToInterned[index] = new WeakReference(copy.intern());
break;
case 2:
refToInterned[index] = new SoftReference(copy.intern());
break;
default:
refToInterned[index] = null;
break;
}
}
for (int index = 0; index < stringsToIntern.size(); index++) {
verify(refToInterned[index], stringsToIntern.get(index));
}
} finally {
RWLOCK.readLock().unlock();
}
if (threadNumber == 0) {
try {
RWLOCK.writeLock().lock();
for (int index = 0; index < stringsToIntern.size(); index++) {
stringsToIntern.set(index, gp.create(maxStringSize).intern());
}
} finally {
RWLOCK.writeLock().unlock();
}
}
}
/*
* Verify that all exist interned strings in a map
* a same objects.
*/
private void verify(Object obj, String str) {
if (obj == null) {
return;
}
if (obj instanceof Reference) {
obj = ((Reference) obj).get();
if (obj == null) {
return;
}
}
if (!(obj instanceof String)) {
throw new TestBug("Expected String. Find :" + obj.getClass());
}
String interned = (String) obj;
if (!interned.equals(str)) {
throw new TestFailure("Interned not equals to original string.");
}
if (obj != str.intern()) {
throw new TestFailure("Interned not same as original string.");
}
}
}
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