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 java.util.concurrent.atomic.AtomicBoolean;
023
024/**
025 * Calls {@link System#exit(int)} except from shutdown hooks, to prevent
026 * deadlocks. See http://stackoverflow.com/a/19552359/229031
027 */
028public class SystemExit {
029
030  private final AtomicBoolean inShutdownHook = new AtomicBoolean(false);
031
032  public void exit(int code) {
033    if (!inShutdownHook.get()) {
034      doExit(code);
035    }
036  }
037
038  public boolean isInShutdownHook() {
039    return inShutdownHook.get();
040  }
041
042  /**
043   * Declarative approach. I don't know how to get this lifecycle state from Java API.
044   */
045  public void setInShutdownHook() {
046    inShutdownHook.set(true);
047  }
048
049  void doExit(int code) {
050    System.exit(code);
051  }
052}