1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    * The contents of this file are subject to the terms of the Liferay Enterprise
5    * Subscription License ("License"). You may not use this file except in
6    * compliance with the License. You can obtain a copy of the License by
7    * contacting Liferay, Inc. See the License for the specific language governing
8    * permissions and limitations under the License, including but not limited to
9    * distribution rights of the Software.
10   *
11   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
12   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
14   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
15   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
16   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
17   * SOFTWARE.
18   */
19  
20  package com.liferay.portal.events;
21  
22  import com.liferay.portal.kernel.events.Action;
23  import com.liferay.portal.kernel.events.ActionException;
24  import com.liferay.portal.kernel.events.SessionAction;
25  import com.liferay.portal.kernel.events.SimpleAction;
26  import com.liferay.portal.kernel.log.Log;
27  import com.liferay.portal.kernel.log.LogFactoryUtil;
28  import com.liferay.portal.kernel.util.InstancePool;
29  import com.liferay.portal.kernel.util.Validator;
30  
31  import java.util.ArrayList;
32  import java.util.HashMap;
33  import java.util.List;
34  import java.util.Map;
35  
36  import javax.servlet.http.HttpServletRequest;
37  import javax.servlet.http.HttpServletResponse;
38  import javax.servlet.http.HttpSession;
39  
40  /**
41   * <a href="EventsProcessor.java.html"><b><i>View Source</i></b></a>
42   *
43   * @author Brian Wing Shun Chan
44   *
45   */
46  public class EventsProcessor {
47  
48      public static void process(String key, String[] classes)
49          throws ActionException {
50  
51          _instance._process(key, classes, null, null, null, null);
52      }
53  
54      public static void process(String key, String[] classes, String[] ids)
55          throws ActionException {
56  
57          _instance._process(key, classes, ids, null, null, null);
58      }
59  
60      public static void process(
61              String key, String[] classes, HttpSession session)
62          throws ActionException {
63  
64          _instance._process(key, classes, null, null, null, session);
65      }
66  
67      public static void process(
68              String key, String[] classes, HttpServletRequest request,
69              HttpServletResponse response)
70          throws ActionException {
71  
72          _instance._process(key, classes, null, request, response, null);
73      }
74  
75      public static void registerEvent(String key, Object event) {
76          _instance._registerEvent(key, event);
77      }
78  
79      public static void unregisterEvent(String key, Object event) {
80          _instance._unregisterEvent(key, event);
81      }
82  
83      private EventsProcessor() {
84      }
85  
86      private List<Object> _getEvents(String key) {
87          List<Object> events = _eventsMap.get(key);
88  
89          if (events == null) {
90              events = new ArrayList<Object>();
91  
92              _eventsMap.put(key, events);
93          }
94  
95          return events;
96      }
97  
98      private void _process(
99              String key, String[] classes, String[] ids,
100             HttpServletRequest request, HttpServletResponse response,
101             HttpSession session)
102         throws ActionException {
103 
104         for (String className : classes) {
105             if (Validator.isNull(className)) {
106                 return;
107             }
108 
109             if (_log.isDebugEnabled()) {
110                 _log.debug("Process event " + className);
111             }
112 
113             Object event = InstancePool.get(className);
114 
115             _processEvent(event, ids, request, response, session);
116         }
117 
118         if (Validator.isNull(key)) {
119             return;
120         }
121 
122         List<Object> events = _getEvents(key);
123 
124         for (Object event : events) {
125             _processEvent(event, ids, request, response, session);
126         }
127     }
128 
129     private void _processEvent(
130             Object event, String[] ids, HttpServletRequest request,
131             HttpServletResponse response, HttpSession session)
132         throws ActionException {
133 
134         if (event instanceof Action) {
135             Action action = (Action)event;
136 
137             try {
138                 action.run(request, response);
139             }
140             catch (ActionException ae) {
141                 throw ae;
142             }
143             catch (Exception e) {
144                 throw new ActionException(e);
145             }
146         }
147         else if (event instanceof SessionAction) {
148             SessionAction sessionAction = (SessionAction)event;
149 
150             try {
151                 sessionAction.run(session);
152             }
153             catch (ActionException ae) {
154                 throw ae;
155             }
156             catch (Exception e) {
157                 throw new ActionException(e);
158             }
159         }
160         else if (event instanceof SimpleAction) {
161             SimpleAction simpleAction = (SimpleAction)event;
162 
163             simpleAction.run(ids);
164         }
165     }
166 
167     private void _registerEvent(String key, Object event) {
168         List<Object> events = _getEvents(key);
169 
170         events.add(event);
171     }
172 
173     private void _unregisterEvent(String key, Object event) {
174         List<Object> events = _getEvents(key);
175 
176         events.remove(event);
177     }
178 
179     private static Log _log = LogFactoryUtil.getLog(EventsProcessor.class);
180 
181     private static EventsProcessor _instance = new EventsProcessor();
182 
183     private Map<String, List<Object>> _eventsMap =
184         new HashMap<String, List<Object>>();
185 
186 }