01: /* TestUtils
02: *
03: * $Id: TestUtils.java 4644 2006-09-20 22:40:21Z paul_jack $
04: *
05: * Created on Dec 28, 2004
06: *
07: * Copyright (C) 2004 Internet Archive.
08: *
09: * This file is part of the Heritrix web crawler (crawler.archive.org).
10: *
11: * Heritrix is free software; you can redistribute it and/or modify
12: * it under the terms of the GNU Lesser Public License as published by
13: * the Free Software Foundation; either version 2.1 of the License, or
14: * any later version.
15: *
16: * Heritrix is distributed in the hope that it will be useful,
17: * but WITHOUT ANY WARRANTY; without even the implied warranty of
18: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: * GNU Lesser Public License for more details.
20: *
21: * You should have received a copy of the GNU Lesser Public License
22: * along with Heritrix; if not, write to the Free Software
23: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: */
25: package org.archive.util;
26:
27: import java.lang.ref.SoftReference;
28: import java.util.LinkedList;
29:
30: /**
31: * Utility methods useful in testing situations.
32: *
33: * @author gojomo
34: */
35: public class TestUtils {
36:
37: /**
38: * Temporarily exhaust memory, forcing weak/soft references to
39: * be broken.
40: */
41: public static void forceScarceMemory() {
42: // force soft references to be broken
43: LinkedList<SoftReference> hog = new LinkedList<SoftReference>();
44: long blocks = Runtime.getRuntime().maxMemory() / 1000000;
45: for (long l = 0; l <= blocks; l++) {
46: try {
47: hog.add(new SoftReference<byte[]>(new byte[1000000]));
48: } catch (OutOfMemoryError e) {
49: hog = null;
50: break;
51: }
52: }
53: }
54: }
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