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/*
* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package gc.g1.unloading.bytecode;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/*
* This class is compiled and invoke due the build to produce
* HumongousTemplateClass.java. The size of generated file is
* too large to store it in the repository.
*/
public class HumongousTemplateClassGen {
private static final String CLASS_NAME = "HumongousTemplateClass";
private static final String PKG_NAME = "gc.g1.unloading.bytecode";
private static final String PKG_DIR_NAME = PKG_NAME.replace(".",
File.separator);
private static final int ITERATIONS = 1075;
private static final double MG = (Math.pow(1024, 2));
private static final int RECORD_COUNT = 16 * ITERATIONS + 10;
public static void addFileTop(List<String> records) {
records.add("package " + PKG_NAME + ";\n");
records.add("\n");
records.add("import java.util.*;\n");
records.add("\n");
records.add("public class " + CLASS_NAME + " {\n");
records.add(" public static void main() {\n");
records.add(" System.out.println(\"In humongous class \");\n");
records.add(" }");
records.add("\n");
}
public static void addIteration(int itNum, List<String> records) {
records.add(" public static Object public_static_object_" + itNum
+ " = new Object();\n");
records.add(" protected static Object protected_static_object_" + itNum
+ " = new Object();\n");
records.add(" private static Object private_static_Object_" + itNum
+ " = new Object();\n");
records.add("\n");
records.add(" public static long public_static_long_" + itNum + ";\n");
records.add(" protected static long protected_static_long_" + itNum
+ " = new Random().nextLong();\n");
records.add(" private static long private_static_long_" + itNum
+ " = 42;\n");
records.add("\n");
records.add(" public Object public_object_" + itNum
+ " = new Object();\n");
records.add(" protected Object protected_object_" + itNum
+ " = new Object();\n");
records.add(" private Object private_Object_" + itNum
+ " = new Object();\n");
records.add("\n");
records.add(" public long public_long_" + itNum + " = 43;\n");
records.add(" protected long protected_long_" + itNum + " = 44;\n");
records.add(" private long private_long_" + itNum
+ " = new Random().nextLong();\n");
}
public static void main(String[] args) throws Exception {
if (args.length < 1) {
System.out.println("Usage: HumongousTemplateClassGen "
+ "<vm-testbase_src_folder>");
return;
}
List<String> records = new ArrayList<String>(RECORD_COUNT);
addFileTop(records);
for (int i = 1; i < ITERATIONS; i++) {
addIteration(i, records);
}
records.add("}");
writeBuffered(records, (int) (MG * 1), args[0]);
}
private static void writeBuffered(List<String> records, int bufSize,
String srcDir) throws IOException {
String path = srcDir + File.separator + PKG_DIR_NAME + File.separator
+ CLASS_NAME + ".java";
System.out.println("Path="+path);
File file = new File (path);
file.getParentFile().mkdirs();
file.createNewFile();
long start = System.currentTimeMillis();
FileWriter writer = new FileWriter(file);
BufferedWriter bufferedWriter = new BufferedWriter(writer, bufSize);
for (String record: records) {
bufferedWriter.write(record);
}
bufferedWriter.flush();
bufferedWriter.close();
long end = System.currentTimeMillis();
System.out.println((end - start) / 1000f + " seconds");
}
}
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