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1   /* This file is part of COPAL (COntext Provisioning for All).
2    *
3    * COPAL is a part of SM4All (Smart hoMes for All) project.
4    *
5    * COPAL is free software: you can redistribute it and/or modify
6    * it under the terms of the GNU Lesser General Public License as published by
7    * the Free Software Foundation, either version 3 of the License, or
8    * (at your option) any later version.
9    *
10   * COPAL is distributed in the hope that it will be useful,
11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   * GNU Lesser General Public License for more details.
14   *
15   * You should have received a copy of the GNU Lesser General Public License
16   * along with COPAL. If not, see <http://www.gnu.org/licenses/>.
17   */
18  package at.ac.tuwien.infosys.sm4all.copal.core.internal;
19  
20  import org.apache.log4j.Logger;
21  import at.ac.tuwien.infosys.sm4all.copal.api.helpers.AbstractGenericActivator;
22  import at.ac.tuwien.infosys.sm4all.copal.service.event.EventSystem;
23  import at.ac.tuwien.infosys.sm4all.copal.service.event.PublishingService;
24  
25  /**
26   * Automatic activator of {@link UnmatchedEventProcessor service}. This service
27   * tracker tracker sets and removes {@link UnmatchedEventProcessor} from
28   * {@link EventSystem} services as it changes its availability.
29   * 
30   * @author sanjin
31   */
32  public class UnmatchedEventProcessorActivator extends AbstractGenericActivator {
33  
34      private static final Logger LOGGER = Logger.getLogger(UnmatchedEventProcessorActivator.class);
35  
36      /**
37       * Creates instance of OSGi Activator for {@link UnmatchedEventProcessor}.
38       */
39      public UnmatchedEventProcessorActivator() {
40          super(EventSystem.class.getName(), PublishingService.class.getName());
41      }
42  
43      @Override
44      protected void start() {
45          final PublishingService publishingService = getDependency(PublishingService.class.getName());
46          final EventSystem eventSystem = getDependency(EventSystem.class.getName());
47  
48          eventSystem.setUnmatchedEventListener(new UnmatchedEventProcessor(
49                  publishingService));
50          LOGGER.info("Successfully set UnmatchedEventProcessor!");
51      }
52  
53      @Override
54      protected void stop() {
55          final EventSystem eventSystem = getDependency(EventSystem.class.getName());
56  
57          eventSystem.setUnmatchedEventListener(null);
58          LOGGER.info("Successfully unset UnmatchedEventProcessor!");
59      }
60  }