92 lines
3.3 KiB
Java
92 lines
3.3 KiB
Java
/*
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* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package metaspace.stressHierarchy.common;
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import java.io.BufferedWriter;
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import java.io.File;
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import java.io.FileWriter;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* This class is compiled and invoke due the build to produce
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* HumongousClass.java. The size of generated file is
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* too large to store it in the repository.
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*/
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public class HumongousClassGen {
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private static final String CLASS_NAME = "HumongousClass";
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private static final String PKG_NAME = "metaspace.stressHierarchy.common";
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private static final String PKG_DIR_NAME = PKG_NAME.replace(".",
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File.separator);
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private static final int ITERATIONS = 65300;
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private static final double MG = (Math.pow(1024, 2));
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private static final int RECORD_COUNT = ITERATIONS + 10;
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public static void addFileHeader(List<String> records) {
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records.add("package " + PKG_NAME + ";\n");
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records.add("\n");
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records.add("public class " + CLASS_NAME + " {\n");
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records.add("\n");
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}
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public static void main(String[] args) throws Exception {
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if (args.length < 1) {
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System.out.println("Usage: HumongousClassGen "
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+ "<vm-testbase_src_folder>");
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throw new RuntimeException("Can't generate " + PKG_NAME + "." + CLASS_NAME);
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}
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List<String> records = new ArrayList<String>(RECORD_COUNT);
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addFileHeader(records);
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for (int i = 1; i <= ITERATIONS; i++) {
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records.add("public long long" + i + ";\n");
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}
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records.add("}");
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writeBuffered(records, (int) (MG * 1), args[0]);
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}
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private static void writeBuffered(List<String> records, int bufSize,
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String srcDir) throws IOException {
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String path = srcDir + File.separator + PKG_DIR_NAME + File.separator
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+ CLASS_NAME + ".java";
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System.out.println("Path="+path);
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File file = new File (path);
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file.getParentFile().mkdirs();
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file.createNewFile();
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long start = System.currentTimeMillis();
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FileWriter writer = new FileWriter(file);
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BufferedWriter bufferedWriter = new BufferedWriter(writer, bufSize);
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for (String record: records) {
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bufferedWriter.write(record);
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}
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bufferedWriter.flush();
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bufferedWriter.close();
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long end = System.currentTimeMillis();
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System.out.println((end - start) / 1000f + " seconds");
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}
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}
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