EventQueueResourceObserver.cpp

00001 /**
00002  * @file    EventQueueResourceObserver.cpp
00003  * @brief   mbed CoAP DynamicResource Thread-based observer (implementation)
00004  * @author  Doug Anson/Chris Paola
00005  * @version 1.0
00006  * @see
00007  *
00008  * Copyright (c) 2017
00009  *
00010  * Licensed under the Apache License, Version 2.0 (the "License");
00011  * you may not use this file except in compliance with the License.
00012  * You may obtain a copy of the License at
00013  *
00014  *     http://www.apache.org/licenses/LICENSE-2.0
00015  *
00016  * Unless required by applicable law or agreed to in writing, software
00017  * distributed under the License is distributed on an "AS IS" BASIS,
00018  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00019  * See the License for the specific language governing permissions and
00020  * limitations under the License.
00021  */
00022  
00023  // Class support
00024  #include "mbed-connector-interface/EventQueueResourceObserver.h"
00025  
00026  #ifdef CONNECTOR_USING_EVENT_QUEUES
00027  
00028  // our instance
00029  static void *_instance = NULL;
00030  
00031  // constructor
00032  EventQueueResourceObserver::EventQueueResourceObserver(DynamicResource *resource,int sleep_time) : ResourceObserver(resource,sleep_time), m_event_queue() {
00033         // default is not observing...
00034         this->setObserving(false);
00035         
00036         // DEBUG
00037         this->logger()->log("EventQueueResourceObserver being used for %s (sleep_time: %d ms)",resource->getFullName().c_str(),sleep_time);
00038         
00039         // our instance
00040         _instance = (void *)this;
00041         
00042         // start the thread by invoking the thread task...
00043         this->m_id = this->m_event_queue.call_every(sleep_time,EventQueueResourceObserver::observation_task);
00044  }
00045  
00046  // destructor
00047  EventQueueResourceObserver::~EventQueueResourceObserver() {
00048      this->stopObservation();
00049      this->m_event_queue.cancel(this->m_id);
00050  }
00051  
00052  // observation task method
00053  void EventQueueResourceObserver::observation_task() {
00054      EventQueueResourceObserver *me = (EventQueueResourceObserver *)_instance;
00055      if (me != NULL && me->isObserving() == true && me->getResource() != NULL) {
00056          DynamicResource *res = me->getResource();
00057          if (res != NULL && res->isRegistered() == true) {
00058              res->observe();
00059          }
00060      }
00061  }
00062 
00063  // begin observing...
00064  void EventQueueResourceObserver::beginObservation() {
00065      this->setObserving(true);
00066  }
00067  
00068  // stop observing...
00069  void EventQueueResourceObserver::stopObservation() {
00070      this->setObserving(false);
00071  }
00072  
00073  // halt the underlying observer mechanism
00074  void EventQueueResourceObserver::halt() {
00075      this->m_event_queue.cancel(this->m_id);
00076  }
00077  
00078  #endif // CONNECTOR_USING_EVENT_QUEUES