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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.api.util;
19  
20  /**
21   * Interface to be implemented by observers which are interested on
22   * notifications of {@link BaseRegistry} changes.
23   * 
24   * @param <T> the type of registered objects.
25   * @author sanjin
26   */
27  public interface RegistryObserver<T> extends Observer<RegistrationState, T> {
28  
29      /**
30       * Called when specified objects changes its {@link RegistrationState} with
31       * a {@link BaseRegistry}.
32       * 
33       * @param state the {@link RegistrationState}.
34       * @param object the changed object.
35       */
36      @Override
37      void update(RegistrationState state, T object);
38  }