/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the License. You may obtain a
 * copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package org.apache.geode.internal;

import java.io.*;
import java.util.*;

/**
 * Used to exec a java main class in its own vm
 *
 *
 */
public class JavaExec {
  /**
   * Creates a java process that executes the given main class and waits for the process to
   * terminate.
   * 
   * @return a {@link ProcessOutputReader} that can be used to get the exit code and stdout+stderr
   *         of the terminated process.
   */
  public static ProcessOutputReader fg(Class main) throws IOException {
    return fg(main, null, null);
  }

  /**
   * Creates a java process that executes the given main class and waits for the process to
   * terminate.
   * 
   * @return a {@link ProcessOutputReader} that can be used to get the exit code and stdout+stderr
   *         of the terminated process.
   */
  public static ProcessOutputReader fg(Class main, String[] vmArgs, String[] mainArgs)
      throws IOException {
    File javabindir = new File(System.getProperty("java.home"), "bin");
    File javaexe = new File(javabindir, "java");

    int bits = Integer.getInteger("sun.arch.data.model", 0).intValue();
    String vmKindArg = (bits == 64) ? "-d64" : null;

    ArrayList argList = new ArrayList();
    argList.add(javaexe.getPath());
    if (vmKindArg != null) {
      argList.add(vmKindArg);
    }
    // argList.add("-Dgemfire.systemDirectory=" +
    // GemFireConnectionFactory.getDefaultSystemDirectory());
    argList.add("-Djava.class.path=" + System.getProperty("java.class.path"));
    argList.add("-Djava.library.path=" + System.getProperty("java.library.path"));
    if (vmArgs != null) {
      argList.addAll(Arrays.asList(vmArgs));
    }
    argList.add(main.getName());
    if (mainArgs != null) {
      argList.addAll(Arrays.asList(mainArgs));
    }
    String[] cmd = (String[]) argList.toArray(new String[argList.size()]);
    return new ProcessOutputReader(Runtime.getRuntime().exec(cmd));
  }
}