1 /* 2 * Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 package nsk.share.gc.gp.list; 25 26 import nsk.share.gc.LinkedMemoryObject; 27 import nsk.share.gc.Memory; 28 import nsk.share.gc.gp.GarbageProducer; 29 import nsk.share.gc.gp.MemoryStrategy; 30 31 /** 32 * Garbage producer that produces circular linked lists. 33 */ 34 public class CircularListProducer implements GarbageProducer<LinkedMemoryObject> { 35 private MemoryStrategy memoryStrategy; 36 CircularListProducer(MemoryStrategy memoryStrategy)37 public CircularListProducer(MemoryStrategy memoryStrategy) { 38 this.memoryStrategy = memoryStrategy; 39 } 40 create(long memory)41 public LinkedMemoryObject create(long memory) { 42 long objectSize = memoryStrategy.getSize(memory); 43 int objectCount = memoryStrategy.getCount(memory); 44 return Memory.makeCircularList(objectCount, (int) objectSize); 45 } 46 validate(LinkedMemoryObject obj)47 public void validate(LinkedMemoryObject obj) { 48 LinkedMemoryObject o = obj; 49 while (o != null && o != obj) 50 o = o.getNext(); 51 } 52 } 53