runtime/org.argeo.slc.server/src/main/java/org/argeo/slc/web/mvc/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;
  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         public final static String KEY_ANSWER = "__answer";
  36         private Long defaultTimeout = 10000l;
  37
  38         // IoC
  39         private SlcEventListenerRegister eventListenerRegister;
  40         private SlcEventListener eventListener = null;
  41
  42         public EventController() {
  43         }
  44
  45         // Business Methods
  46
  47         @RequestMapping("/addEventListener.service")
  48         public ExecutionAnswer addEventListener(
  49                         @RequestParam(SlcEvent.EVENT_TYPE) String eventType,
  50                         @RequestParam(value = SlcEvent.EVENT_FILTER, required = false) String eventFilter) {
  51
  52                 eventListenerRegister
  53                                 .addEventListenerDescriptor(new SlcEventListenerDescriptor(
  54                                                 eventType, eventFilter));
  55                 if (log.isTraceEnabled())
  56                         log.trace("Registered listener on register "
  57                                         + eventListenerRegister.getId() + " for type " + eventType
  58                                         + ", filter=" + eventFilter);
  59                 return ExecutionAnswer.ok("Execution completed properly");
  60
  61         }
  62
  63         @RequestMapping("/removeEventListener.service")
  64         public ExecutionAnswer removeEventListener(
  65                         @RequestParam(SlcEvent.EVENT_TYPE) String eventType,
  66                         @RequestParam(value = SlcEvent.EVENT_FILTER, required = false) String eventFilter) {
  67
  68                 eventListenerRegister
  69                                 .removeEventListenerDescriptor(new SlcEventListenerDescriptor(
  70                                                 eventType, eventFilter));
  71                 if (log.isTraceEnabled())
  72                         log.trace("Removed listener from register "
  73                                         + eventListenerRegister.getId() + " for type " + eventType
  74                                         + ", filter=" + eventFilter);
  75                 return ExecutionAnswer.ok("Execution completed properly");
  76         }
  77
  78         @RequestMapping("/pollEvent.service")
  79         public Object pollEvent(
  80                         @RequestParam(value = "timeout", required = false) String timeoutStr) {
  81                 final Long timeout;
  82                 if (timeoutStr != null)
  83                         timeout = Long.parseLong(timeoutStr);
  84                 else
  85                         timeout = defaultTimeout;
  86
  87                 SlcEvent event = eventListener.listen(eventListenerRegister.getId(),
  88                                 eventListenerRegister.getDescriptorsCopy(), timeout);
  89                 if (event != null) {
  90                         return event;
  91                 } else {
  92                         return ExecutionAnswer.ok("Execution completed properly");
  93                 }
  94         }
  95
  96         public void setEventListenerRegister(
  97                         SlcEventListenerRegister eventListenerRegister) {
  98                 this.eventListenerRegister = eventListenerRegister;
  99         }
 100
 101         public void setDefaultTimeout(Long defaultTimeout) {
 102                 this.defaultTimeout = defaultTimeout;
 103         }
 104
 105         public void setEventListener(SlcEventListener eventListener) {
 106                 this.eventListener = eventListener;
 107         }
 108 }