runtime/org.argeo.slc.server/src/main/java/org/argeo/slc/web/mvc/controllers/EventController.java

   1 /*
   2  * Copyright (C) 2007-2012 Mathieu Baudier
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.slc.web.mvc.controllers;
  17
  18 import org.apache.commons.logging.Log;
  19 import org.apache.commons.logging.LogFactory;
  20 import org.argeo.slc.msg.ExecutionAnswer;
  21 import org.argeo.slc.msg.event.SlcEvent;
  22 import org.argeo.slc.msg.event.SlcEventListener;
  23 import org.argeo.slc.msg.event.SlcEventListenerDescriptor;
  24 import org.argeo.slc.msg.event.SlcEventListenerRegister;
  25 import org.springframework.stereotype.Controller;
  26 import org.springframework.web.bind.annotation.RequestMapping;
  27 import org.springframework.web.bind.annotation.RequestParam;
  28
  29 @Controller
  30 public class EventController {
  31
  32         private final static Log log = LogFactory.getLog(EventController.class);
  33
  34         private Long defaultTimeout = 10000l;
  35
  36         // IoC
  37         private SlcEventListener eventListener = null;
  38         // the following bean as a Session scope.
  39         private SlcEventListenerRegister eventListenerRegister;
  40
  41         // Business Methods
  42         @RequestMapping("/addEventListener.service")
  43         public ExecutionAnswer addEventListener(
  44                         @RequestParam(SlcEvent.EVENT_TYPE) String eventType,
  45                         @RequestParam(value = SlcEvent.EVENT_FILTER, required = false) String eventFilter) {
  46
  47                 eventListenerRegister
  48                                 .addEventListenerDescriptor(new SlcEventListenerDescriptor(
  49                                                 eventType, eventFilter));
  50                 if (log.isTraceEnabled()) {
  51                         log.trace("Registered listener on register "
  52                                         + eventListenerRegister.getId() + " for type " + eventType
  53                                         + ", filter=" + eventFilter);
  54                         log.trace("Nb of registered descriptors : "
  55                                         + eventListenerRegister.getDescriptorsCopy().size());
  56                 }
  57                 return ExecutionAnswer.ok("Execution completed properly");
  58
  59         }
  60
  61         @RequestMapping("/removeEventListener.service")
  62         public ExecutionAnswer removeEventListener(
  63                         @RequestParam(SlcEvent.EVENT_TYPE) String eventType,
  64                         @RequestParam(value = SlcEvent.EVENT_FILTER, required = false) String eventFilter) {
  65
  66                 eventListenerRegister
  67                                 .removeEventListenerDescriptor(new SlcEventListenerDescriptor(
  68                                                 eventType, eventFilter));
  69                 if (log.isTraceEnabled()) {
  70                         log.trace("Removed listener from register "
  71                                         + eventListenerRegister.getId() + " for type " + eventType
  72                                         + ", filter=" + eventFilter);
  73                         log.trace("Nb of registered descriptors : "
  74                                         + eventListenerRegister.getDescriptorsCopy().size());
  75                 }
  76                 return ExecutionAnswer.ok("Execution completed properly");
  77         }
  78
  79         @RequestMapping("/pollEvent.service")
  80         public Object pollEvent(
  81                         @RequestParam(value = "timeout", required = false) String timeoutStr) {
  82                 final Long timeout;
  83                 if (timeoutStr != null)
  84                         timeout = Long.parseLong(timeoutStr);
  85                 else
  86                         timeout = defaultTimeout;
  87                 if (log.isTraceEnabled()) {
  88                         log.trace("Begin poolEvent.service :"
  89                                         + " Nb of registered descriptors : "
  90                                         + eventListenerRegister.getDescriptorsCopy().size());
  91                 }
  92                 SlcEvent event = eventListener.listen(eventListenerRegister.getId(),
  93                                 eventListenerRegister.getDescriptorsCopy(), timeout);
  94                 if (event != null) {
  95                         if (log.isTraceEnabled())
  96                                 log.trace("Event heard : " + event.toString());
  97                         return event;
  98                 } else {
  99                         if (log.isTraceEnabled())
 100                                 log.trace("No Event heard - Time out: ");
 101                         return ExecutionAnswer.ok("Execution completed properly");
 102                 }
 103
 104         }
 105
 106         public void setEventListenerRegister(
 107                         SlcEventListenerRegister eventListenerRegister) {
 108                 this.eventListenerRegister = eventListenerRegister;
 109         }
 110
 111         public void setDefaultTimeout(Long defaultTimeout) {
 112                 this.defaultTimeout = defaultTimeout;
 113         }
 114
 115         public void setEventListener(SlcEventListener eventListener) {
 116                 this.eventListener = eventListener;
 117         }
 118 }