1+ /*
2+ * Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
3+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4+ *
5+ * The Universal Permissive License (UPL), Version 1.0
6+ *
7+ * Subject to the condition set forth below, permission is hereby granted to any
8+ * person obtaining a copy of this software, associated documentation and/or
9+ * data (collectively the "Software"), free of charge and under any and all
10+ * copyright rights in the Software, and any and all patent rights owned or
11+ * freely licensable by each licensor hereunder covering either (i) the
12+ * unmodified Software as contributed to or provided by such licensor, or (ii)
13+ * the Larger Works (as defined below), to deal in both
14+ *
15+ * (a) the Software, and
16+ *
17+ * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
18+ * one is included with the Software each a "Larger Work" to which the Software
19+ * is contributed by such licensors),
20+ *
21+ * without restriction, including without limitation the rights to copy, create
22+ * derivative works of, display, perform, and distribute the Software and make,
23+ * use, sell, offer for sale, import, export, have made, and have sold the
24+ * Software and the Larger Work(s), and to sublicense the foregoing rights on
25+ * either these or other terms.
26+ *
27+ * This license is subject to the following condition:
28+ *
29+ * The above copyright notice and either this complete permission notice or at a
30+ * minimum a reference to the UPL must be included in all copies or substantial
31+ * portions of the Software.
32+ *
33+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
34+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
35+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
36+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
37+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
38+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
39+ * SOFTWARE.
40+ */
41+ import java .util .ArrayDeque ;
42+
43+ public class StringManipulation {
44+
45+ public static void main (String [] args ) {
46+ System .out .println ("Starting string manipulation GC stress test..." );
47+
48+ // Parse arguments
49+ int iterations = 1000000 ;
50+ int numKeptAliveObjects = 100000 ;
51+ if (args .length > 0 ) {
52+ iterations = Integer .parseInt (args [0 ]);
53+ }
54+ if (args .length > 1 ) {
55+ numKeptAliveObjects = Integer .parseInt (args [1 ]);
56+ }
57+
58+ ArrayDeque <String []> aliveData = new ArrayDeque <String []>(numKeptAliveObjects + 1 );
59+ for (int i = 0 ; i < iterations ; i ++) {
60+ // Simulate log entry generation and log entry splitting. The last n entries are kept in memory.
61+ String base = "log-entry" ;
62+ StringBuilder builder = new StringBuilder (base );
63+
64+ for (int j = 0 ; j < 100 ; j ++) {
65+ builder .append ("-" ).append (System .nanoTime ());
66+ }
67+
68+ String logEntry = builder .toString ();
69+ String [] parts = logEntry .split ("-" );
70+
71+ aliveData .addLast (parts );
72+ if (aliveData .size () > numKeptAliveObjects ) {
73+ aliveData .removeFirst ();
74+ }
75+
76+ // Periodically log progress
77+ if (i % 100000 == 0 ) {
78+ System .out .println ("Processed " + i + " log entries" );
79+ }
80+ }
81+
82+ System .out .println ("String manipulation GC stress test completed: " + aliveData .hashCode ());
83+ }
84+ }
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