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25 package org.ofbiz.webapp.event;
26
27 import java.util.HashMap  ;
28 import java.util.Iterator ;
29 import java.util.List ;
30 import java.util.Map ;
31 import javax.servlet.ServletContext ;
32 import javax.servlet.http.HttpServletRequest ;
33 import javax.servlet.http.HttpServletResponse ;
34
35 import org.ofbiz.base.util.Debug;
36 import org.ofbiz.base.util.GeneralRuntimeException;
37 import org.ofbiz.base.util.ObjectType;
38 import org.ofbiz.webapp.control.RequestHandler;
39 import org.ofbiz.webapp.control.RequestManager;
40
41
48 public class EventFactory {
49
50 public static final String module = EventFactory.class.getName();
51
52 protected RequestHandler requestHandler = null;
53 protected RequestManager requestManager = null;
54 protected ServletContext context = null;
55 protected Map handlers = null;
56
57 public EventFactory(RequestHandler requestHandler) {
58 handlers = new HashMap ();
59 this.requestHandler = requestHandler;
60 this.requestManager = requestHandler.getRequestManager();
61 this.context = requestHandler.getServletContext();
62
63 try {
65 this.preLoadAll();
66 } catch (EventHandlerException e) {
67 Debug.logError(e, module);
68 throw new GeneralRuntimeException(e);
69 }
70 }
71
72 private void preLoadAll() throws EventHandlerException {
73 List handlers = requestManager.getHandlerKeys(RequestManager.EVENT_HANDLER_KEY);
74 if (handlers != null) {
75 Iterator i = handlers.iterator();
76 while (i.hasNext()) {
77 String type = (String ) i.next();
78 this.handlers.put(type, this.loadEventHandler(type));
79 }
80 }
81 }
82
83 public EventHandler getEventHandler(String type) throws EventHandlerException {
84 if (handlers.size() == 0) {
86 this.preLoadAll();
87 }
88
89 EventHandler handler = (EventHandler) handlers.get(type);
91
92 if (handler == null) {
93 synchronized (EventHandler.class) {
94 handler = (EventHandler) handlers.get(type);
95 if (handler == null) {
96 handler = this.loadEventHandler(type);
97 handlers.put(type, handler);
98 }
99 }
100 if (handler == null)
101 throw new EventHandlerException("No handler found for type: " + type);
102 }
103 return handler;
104 }
105
106 public void clear() {
107 handlers.clear();
108 }
109
110 private EventHandler loadEventHandler(String type) throws EventHandlerException {
111 EventHandler handler = null;
112 String handlerClass = requestManager.getHandlerClass(type, RequestManager.EVENT_HANDLER_KEY);
113 if (handlerClass == null) {
114 throw new EventHandlerException("Unknown handler type: " + type);
115 }
116
117 try {
118 handler = (EventHandler) ObjectType.getInstance(handlerClass);
119 handler.init(context);
120 } catch (NoClassDefFoundError e) {
121 throw new EventHandlerException("No class def found for handler [" + handlerClass + "]", e);
122 } catch (ClassNotFoundException cnf) {
123 throw new EventHandlerException("Cannot load handler class [" + handlerClass + "]", cnf);
124 } catch (InstantiationException ie) {
125 throw new EventHandlerException("Cannot get instance of the handler [" + handlerClass + "]", ie);
126 } catch (IllegalAccessException iae) {
127 throw new EventHandlerException(iae.getMessage(), iae);
128 }
129 return handler;
130 }
131
132 public static String runRequestEvent(HttpServletRequest request, HttpServletResponse response, String requestUri)
133 throws EventHandlerException {
134 ServletContext application = ((ServletContext ) request.getAttribute("servletContext"));
135 RequestHandler handler = (RequestHandler) application.getAttribute("_REQUEST_HANDLER_");
136 RequestManager rm = handler.getRequestManager();
137 String eventType = rm.getEventType(requestUri);
138 String eventPath = rm.getEventPath(requestUri);
139 String eventMethod = rm.getEventMethod(requestUri);
140 return handler.runEvent(request, response, eventType, eventPath, eventMethod);
141 }
142 }
143 |
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