content: /*
   * Copyright 2014 Hannes Janetzek
   *
   * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
   *
   * This program is free software: you can redistribute it and/or modify it under the
   * terms of the GNU Lesser General Public License as published by the Free Software
   * Foundation, either version 3 of the License, or (at your option) any later version.
   *
   * This program 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 Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public License along with
   * this program. If not, see <http://www.gnu.org/licenses/>.
   */
  package org.oscim.utils.async;
  
  public abstract class AsyncTask extends Task {
      private TaskQueue mainloop;
  
      void setTaskQueue(TaskQueue mainloop) {
          this.mainloop = mainloop;
      }
  
      /**
       * Do not override! Unless you have a reason, of course.
       */
      @Override
      public void run() {
          if (state == GO) {
              /* running on worker thread */
              state = go(false);
  
              if (state == GO)
                  /* run on worker again */
                  mainloop.addTask(this);
              else
                  mainloop.post(this);
          } else {
              /* post result on main-loop */
              onPostExecute(state);
          }
      }
  
      /**
       * Executed on worker thread.
       *
       * @return Task.DONE on success, Task.ERROR otherwise
       */
      @Override
      public abstract int go(boolean canceled);
  
      /**
       * Executed on mainloop thread.
       */
      public abstract void onPostExecute(int state);
  
  }
  