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

   1 /*
   2  * Copyright (C) 2010 Mathieu Baudier <mbaudier@argeo.org>
   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
  17 package org.argeo.slc.web.mvc.controllers;
  18
  19 import org.apache.commons.logging.Log;
  20 import org.apache.commons.logging.LogFactory;
  21 import org.argeo.slc.msg.ExecutionAnswer;
  22 import org.argeo.slc.msg.event.SlcEvent;
  23 import org.argeo.slc.msg.event.SlcEventListener;
  24 import org.argeo.slc.msg.event.SlcEventListenerDescriptor;
  25 import org.argeo.slc.msg.event.SlcEventListenerRegister;
  26 import org.springframework.stereotype.Controller;
  27 import org.springframework.web.bind.annotation.RequestMapping;
  28 import org.springframework.web.bind.annotation.RequestParam;
  29
  30 @Controller
  31 public class EventController {
  32
  33         private final static Log log = LogFactory.getLog(EventController.class);
  34
  35         private Long defaultTimeout = 10000l;
  36
  37         // IoC
  38         private SlcEventListener eventListener = null;
  39         // the following bean as a Session scope.
  40         private SlcEventListenerRegister eventListenerRegister;
  41
  42         // Business Methods
  43         @RequestMapping("/addEventListener.service")
  44         public ExecutionAnswer addEventListener(
  45                         @RequestParam(SlcEvent.EVENT_TYPE) String eventType,
  46                         @RequestParam(value = SlcEvent.EVENT_FILTER, required = false) String eventFilter) {
  47
  48                 eventListenerRegister
  49                                 .addEventListenerDescriptor(new SlcEventListenerDescriptor(
  50                                                 eventType, eventFilter));
  51                 if (log.isTraceEnabled()) {
  52                         log.trace("Registered listener on register "
  53                                         + eventListenerRegister.getId() + " for type " + eventType
  54                                         + ", filter=" + eventFilter);
  55                         log.trace("Nb of registered descriptors : "
  56                                         + eventListenerRegister.getDescriptorsCopy().size());
  57                 }
  58                 return ExecutionAnswer.ok("Execution completed properly");
  59
  60         }
  61
  62         @RequestMapping("/removeEventListener.service")
  63         public ExecutionAnswer removeEventListener(
  64                         @RequestParam(SlcEvent.EVENT_TYPE) String eventType,
  65                         @RequestParam(value = SlcEvent.EVENT_FILTER, required = false) String eventFilter) {
  66
  67                 eventListenerRegister
  68                                 .removeEventListenerDescriptor(new SlcEventListenerDescriptor(
  69                                                 eventType, eventFilter));
  70                 if (log.isTraceEnabled()) {
  71                         log.trace("Removed listener from register "
  72                                         + eventListenerRegister.getId() + " for type " + eventType
  73                                         + ", filter=" + eventFilter);
  74                         log.trace("Nb of registered descriptors : "
  75                                         + eventListenerRegister.getDescriptorsCopy().size());
  76                 }
  77                 return ExecutionAnswer.ok("Execution completed properly");
  78         }
  79
  80         @RequestMapping("/pollEvent.service")
  81         public Object pollEvent(
  82                         @RequestParam(value = "timeout", required = false) String timeoutStr) {
  83                 final Long timeout;
  84                 if (timeoutStr != null)
  85                         timeout = Long.parseLong(timeoutStr);
  86                 else
  87                         timeout = defaultTimeout;
  88                 if (log.isTraceEnabled()) {
  89                         log.trace("Begin poolEvent.service :"
  90                                         + " Nb of registered descriptors : "
  91                                         + eventListenerRegister.getDescriptorsCopy().size());
  92                 }
  93                 SlcEvent event = eventListener.listen(eventListenerRegister.getId(),
  94                                 eventListenerRegister.getDescriptorsCopy(), timeout);
  95                 if (event != null) {
  96                         if (log.isTraceEnabled())
  97                                 log.trace("Event heard : " + event.toString());
  98                         return event;
  99                 } else {
 100                         if (log.isTraceEnabled())
 101                                 log.trace("No Event heard - Time out: ");
 102                         return ExecutionAnswer.ok("Execution completed properly");
 103                 }
 104
 105         }
 106
 107         public void setEventListenerRegister(
 108                         SlcEventListenerRegister eventListenerRegister) {
 109                 this.eventListenerRegister = eventListenerRegister;
 110         }
 111
 112         public void setDefaultTimeout(Long defaultTimeout) {
 113                 this.defaultTimeout = defaultTimeout;
 114         }
 115
 116         public void setEventListener(SlcEventListener eventListener) {
 117                 this.eventListener = eventListener;
 118         }
 119 }