code: /*
   * Computoser is a music-composition algorithm and a website to present the results
   * Copyright (C) 2012-2014  Bozhidar Bozhanov
   *
   * Computoser is free software: you can redistribute it and/or modify
   * it under the terms of the GNU Affero General Public License as
   * published by the Free Software Foundation, either version 3 of the
   * License, or (at your option) any later version.
   *
   * Computoser 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 Affero General Public License for more details.
   *
   * You should have received a copy of the GNU Affero General Public License
   * along with Computoser.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  package com.music.scheduled;
  
  import javax.inject.Inject;
  
  import org.joda.time.DateTimeConstants;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.scheduling.annotation.Scheduled;
  import org.springframework.stereotype.Component;
  
  import com.music.service.PieceService;
  import com.music.util.SharedData;
  
  @Component
  public class MusicGenerationJob {
  
      private static final Logger logger = LoggerFactory.getLogger(MusicGenerationJob.class);
  
      @Inject
      private PieceService service;
  
      @Inject
      private SharedData sharedData;
  
      @Scheduled(fixedDelay = 12 * DateTimeConstants.MILLIS_PER_MINUTE)
      public void generate() {
          if (sharedData.isGenerateMusic()) {
              logger.info("Starting piece generation");
              //TODO more precise adjustment this according to users' listening activity
              int piecesNeeded = sharedData.isAdaptGenerationQuantity() && sharedData.getListeningRequests().get() > 10 ? 3 : 1;
              for (int i = 0; i < piecesNeeded; i ++) {
                  long id = service.generatePiece();
                  sharedData.setMaxId(id);
              }
              // reset
              sharedData.getListeningRequests().set(0);
          }
      }
  }
  