1 /* 2 * Copyright (c) 2015, 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 package metaspace.stressHierarchy.common; 24 25 import java.io.BufferedWriter; 26 import java.io.File; 27 import java.io.FileWriter; 28 import java.io.IOException; 29 import java.util.ArrayList; 30 import java.util.List; 31 32 /** 33 * This class is compiled and invoke due the build to produce 34 * HumongousClass.java. The size of generated file is 35 * too large to store it in the repository. 36 */ 37 38 public class HumongousClassGen { 39 40 private static final String CLASS_NAME = "HumongousClass"; 41 private static final String PKG_NAME = "metaspace.stressHierarchy.common"; 42 private static final String PKG_DIR_NAME = PKG_NAME.replace(".", 43 File.separator); 44 private static final int ITERATIONS = 65300; 45 private static final double MG = (Math.pow(1024, 2)); 46 private static final int RECORD_COUNT = ITERATIONS + 10; 47 48 public static void addFileHeader(List<String> records) { 49 records.add("package " + PKG_NAME + ";\n"); 50 records.add("\n"); 51 records.add("public class " + CLASS_NAME + " {\n"); 52 records.add("\n"); 53 } 54 55 public static void main(String[] args) throws Exception { 56 if (args.length < 1) { 57 System.out.println("Usage: HumongousClassGen " 58 + "<vm-testbase_src_folder>"); 59 throw new RuntimeException("Can't generate " + PKG_NAME + "." + CLASS_NAME); 60 } 61 62 List<String> records = new ArrayList<String>(RECORD_COUNT); 63 addFileHeader(records); 64 for (int i = 1; i <= ITERATIONS; i++) { 65 records.add("public long long" + i + ";\n"); 66 } 67 records.add("}"); 68 writeBuffered(records, (int) (MG * 1), args[0]); 69 } 70 71 private static void writeBuffered(List<String> records, int bufSize, 72 String srcDir) throws IOException { 73 String path = srcDir + File.separator + PKG_DIR_NAME + File.separator 74 + CLASS_NAME + ".java"; 75 System.out.println("Path="+path); 76 File file = new File (path); 77 file.getParentFile().mkdirs(); 78 file.createNewFile(); 79 long start = System.currentTimeMillis(); 80 FileWriter writer = new FileWriter(file); 81 BufferedWriter bufferedWriter = new BufferedWriter(writer, bufSize); 82 83 for (String record: records) { 84 bufferedWriter.write(record); 85 } 86 bufferedWriter.flush(); 87 bufferedWriter.close(); 88 long end = System.currentTimeMillis(); 89 System.out.println((end - start) / 1000f + " seconds"); 90 } 91 }