143 lines
4.6 KiB
Java
143 lines
4.6 KiB
Java
/*
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* Copyright (c) 2011, 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package gc.gctests.PhantomReference;
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import java.lang.ref.ReferenceQueue;
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import java.util.Date;
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import java.util.HashMap;
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/**
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* Helper class that tracks the original hash code for the
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* object.
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*/
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public final class PhantomHelper {
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private int originalHashCode;
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private int hashCounter;
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/**
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* Constructor for helper class that tracks the hash code.
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*
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* @param originalHashCode Referred objects hash code
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*/
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public PhantomHelper(int originalHashCode) {
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this.originalHashCode = originalHashCode;
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hashCounter = 1;
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}
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/**
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* Get the referred objects original hash code.
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*
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* @return Original referred objects hash code
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*/
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public int getOriginalHashCode() {
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return originalHashCode;
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}
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/**
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* Increase the counter for the number of objects
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* using this hash code.
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*/
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public void increaseHashCounter() {
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hashCounter++;
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}
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/**
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* Decrease the counter for the number of objects
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* using this hash code.
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*/
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public void decreaseHashCounter() {
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hashCounter--;
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}
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/**
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* Retreive the hash code counter.
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*
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* @return Hash code counter value
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*/
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public int getHashCounter() {
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return hashCounter;
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}
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/**
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* Verify all the hash codes from the objects in the reference
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* queue against the hash map.
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*
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* @param rq Reference queue for the phantom references.
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* @param hmHelper Hashmap that contains all the hash codes
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* @param maxWaitTime Maximum time to wait for completion of deref:ing
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* from the reference queue.
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* @return True if all hash codes matches
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*/
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public static final String checkAllHashCodes(ReferenceQueue rq,
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HashMap hmHelper,
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long maxWaitTime) {
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// Check all the phantom references
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long startTime = new Date().getTime();
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boolean keepRunning = true;
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while (keepRunning) {
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try {
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PRHelper prh = (PRHelper) rq.remove(1000);
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if (prh != null) {
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Integer ik = Integer.valueOf(prh.getReferentHashCode());
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PhantomHelper ph = (PhantomHelper) hmHelper.get(ik);
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if (ph != null) {
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if (ph.getOriginalHashCode()
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== prh.getReferentHashCode()) {
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ph.decreaseHashCounter();
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if (ph.getHashCounter() == 0) {
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hmHelper.remove(
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Integer.valueOf(prh.getReferentHashCode()));
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} else {
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hmHelper.put(ik, ph);
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}
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prh.clear();
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}
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} else {
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return "Unmapped hash code detected. The test is faulty.";
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}
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prh = null;
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}
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} catch (InterruptedException e) {
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; // Checkstyle wants at least one line here...
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}
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if (new Date().getTime() - startTime > maxWaitTime) {
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return "All phantom references weren't processed "
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+ "in the configured max time ("
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+ (maxWaitTime / 1000) + " secs)";
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}
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if (hmHelper.size() == 0) {
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keepRunning = false;
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}
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}
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return null;
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}
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}
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