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 }