1 /*
2 * Copyright (c) 2002-2014, Mairie de Paris
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright notice
10 * and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright notice
13 * and the following disclaimer in the documentation and/or other materials
14 * provided with the distribution.
15 *
16 * 3. Neither the name of 'Mairie de Paris' nor 'Lutece' nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 *
32 * License 1.0
33 */
34 package fr.paris.lutece.portal.service.search;
35
36 import fr.paris.lutece.portal.service.util.AppLogService;
37
38 import java.util.ArrayList;
39 import java.util.List;
40
41
42 /**
43 * QueryListenersService
44 */
45 public final class QueryListenersService
46 {
47 private static List<QueryEventListener> _listListeners = new ArrayList<QueryEventListener>( );
48 private static volatile QueryListenersService _singleton;
49
50 /**
51 * Creates a new instance of QueryListenersService
52 */
53 private QueryListenersService( )
54 {
55 }
56
57 /**
58 * Returns the unique instance of the service
59 * @return The instance of the service
60 */
61 public static QueryListenersService getInstance( )
62 {
63 if ( _singleton == null )
64 {
65 _singleton = new QueryListenersService( );
66 }
67
68 return _singleton;
69 }
70
71 /**
72 * Register a new listener
73 * @param listener The listener to register
74 */
75 public void registerQueryListener( QueryEventListener listener )
76 {
77 _listListeners.add( listener );
78 AppLogService.info( "New Query Event Listener registered : " + listener.getClass( ).getName( ) );
79 }
80
81 /**
82 * Notify all registered listeners
83 * @param event The query event to notify
84 */
85 public void notifyListeners( QueryEvent event )
86 {
87 for ( QueryEventListener listener : _listListeners )
88 {
89 try
90 {
91 listener.processQueryEvent( event );
92 }
93 catch ( Exception e )
94 {
95 // Catch any exception in order to stay in the loop to notify all listeners
96 AppLogService.error( "Error while processing query event : " + e.getMessage( ), e );
97 }
98 }
99 }
100 }