001/*
002 * SonarQube, open source software quality management tool.
003 * Copyright (C) 2008-2014 SonarSource
004 * mailto:contact AT sonarsource DOT com
005 *
006 * SonarQube is free software; you can redistribute it and/or
007 * modify it under the terms of the GNU Lesser General Public
008 * License as published by the Free Software Foundation; either
009 * version 3 of the License, or (at your option) any later version.
010 *
011 * SonarQube is distributed in the hope that it will be useful,
012 * but WITHOUT ANY WARRANTY; without even the implied warranty of
013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014 * Lesser General Public License for more details.
015 *
016 * You should have received a copy of the GNU Lesser General Public License
017 * along with this program; if not, write to the Free Software Foundation,
018 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
019 */
020package org.sonar.process;
021
022import org.apache.commons.io.IOUtils;
023import org.slf4j.LoggerFactory;
024
025import javax.annotation.Nullable;
026
027public class ProcessUtils {
028
029  private ProcessUtils() {
030    // only static stuff
031  }
032
033  /**
034   * Do not abuse to this method. It uses exceptions to get status.
035   * @return false if process is null or terminated, else true.
036   */
037  public static boolean isAlive(@Nullable Process process) {
038    boolean alive = false;
039    if (process != null) {
040      try {
041        process.exitValue();
042      } catch (IllegalThreadStateException ignored) {
043        alive = true;
044      }
045    }
046    return alive;
047  }
048
049  /**
050   * Send kill signal to stop process. Shutdown hooks are executed. It's the equivalent of SIGTERM on Linux.
051   * Correctly tested on Java 6 and 7 on both Mac/MSWindows
052   * @return true if the signal is sent, false if process is already down
053   */
054  public static boolean sendKillSignal(@Nullable Process process) {
055    boolean sentSignal = false;
056    if (isAlive(process)) {
057      try {
058        process.destroy();
059        sentSignal = true;
060      } catch (Exception e) {
061        LoggerFactory.getLogger(ProcessUtils.class).error("Fail to kill " + process, e);
062      }
063    }
064    return sentSignal;
065  }
066
067  public static void closeStreams(@Nullable Process process) {
068    if (process!=null) {
069      IOUtils.closeQuietly(process.getInputStream());
070      IOUtils.closeQuietly(process.getOutputStream());
071      IOUtils.closeQuietly(process.getErrorStream());
072    }
073  }
074}