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/*
* Copyright (c) 2003, 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 nsk.jvmti.ForceGarbageCollection;
import java.io.PrintStream;
import java.lang.ref.SoftReference;
import nsk.share.*;
import nsk.share.jvmti.*;
public class forcegc001 extends DebugeeClass {
/* Load native library if required. */
static {
loadLibrary("forcegc001");
}
/* Run test from command line. */
public static void main(String argv[]) {
argv = nsk.share.jvmti.JVMTITest.commonInit(argv);
// JCK-compatible exit
System.exit(run(argv, System.out) + Consts.JCK_STATUS_BASE);
}
/* Run test from JCK-compatible environment. */
public static int run(String argv[], PrintStream out) {
return new forcegc001().runIt(argv, out);
}
/* =================================================================== */
/* scaffold objects */
ArgumentHandler argHandler = null;
Log log = null;
long timeout = 0;
int status = Consts.TEST_PASSED;
/* constants */
public static final int DEFAULT_OBJECTS_COUNT = 100;
/* Run debuggee code. */
public int runIt(String argv[], PrintStream out) {
argHandler = new ArgumentHandler(argv);
log = new Log(out, argHandler);
timeout = argHandler.getWaitTime() * 60 * 1000; // milliseconds
int count = argHandler.findOptionIntValue("objects", DEFAULT_OBJECTS_COUNT);
log.display("Creating tested objects: " + count + " objects");
Object objects[] = new Object[count];
for (int i = 0; i < count; i++) {
objects[i] = new Object();
}
log.display("Creating soft references for: " + count + " objects");
SoftReference<?> refs[] = new SoftReference[count];
for (int i = 0; i < count; i++) {
refs[i] = new SoftReference<Object>(objects[i]);
}
log.display("Clearing stroong references to the tested objects");
objects = null;
log.display("Sync: objects ready for GC");
status = checkStatus(status);
String kind = "after ForceGarbageCollection()";
log.display("Checking soft references " + kind + ": " + count + " references");
int found = checkObjects(count, refs, kind);
if (found > 0) {
kind = "after System.gc()";
System.gc();
log.display("Checking soft references " + kind + ": " + count + " references");
int found1 = checkObjects(count, refs, kind);
if (found1 < found) {
log.println("# WARNING: " + found1 + " of " + found
+ " softly reachable objects were GCed\n"
+ "# by System.gc() but not by ForceGarbageCollection()");
}
}
return status;
}
/* Check if soft references to objects were cleared by GC, */
public int checkObjects(int count, SoftReference<?> refs[], String kind) {
int found = 0;
for (int i = 0; i < count; i++) {
if (refs[i].get() != null)
found++;
}
if (found > 0) {
log.println("# WARNING: " + found + " of " + count
+ " softly reachable objects not GCed " + kind);
} else {
log.display("All " + found + " of " + count
+ " softly reachable objects GCed " + kind);
}
return found;
}
}
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