TickerResourceObserver.cpp

00001 /**
00002  * @file    TickerResourceObserver.cpp
00003  * @brief   mbed CoAP DynamicResource Ticker-based observer (implementation)
00004  * @author  Doug Anson/Chris Paola
00005  * @version 1.0
00006  * @see
00007  *
00008  * Copyright (c) 2014
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/TickerResourceObserver.h"
00025  
00026  #ifdef CONNECTOR_USING_TICKER
00027  
00028  // our instance
00029  static void *_instance = NULL;
00030   
00031  // constructor
00032  TickerResourceObserver::TickerResourceObserver(DynamicResource *resource,int sleep_time) : ResourceObserver(resource,(int)(sleep_time/1000)) {
00033      this->setObserving(false);
00034      
00035      // DEBUG
00036      this->logger()->log("TickerResourceObserver being used for %s (sleep_time: %d ms)",resource->getFullName().c_str(),sleep_time);
00037      
00038      // our instance
00039      _instance = (void *)this;
00040  }
00041   
00042  // destructor
00043  TickerResourceObserver::~TickerResourceObserver() {
00044      this->stopObservation();
00045  }
00046 
00047  // observation task method
00048  void TickerResourceObserver::observation_task() {
00049      TickerResourceObserver *me = (TickerResourceObserver *)_instance;
00050      if (me != NULL && me->isObserving() == true && me->getResource() != NULL) {
00051          DynamicResource *res = me->getResource();
00052          if (res != NULL && res->isRegistered() == true) {
00053              res->observe();
00054          }
00055      }
00056  }
00057  
00058  // begin observing...
00059  void TickerResourceObserver::beginObservation() {
00060      if (this->isObserving() == false) {
00061         this->m_ticker.attach(this,&TickerResourceObserver::observation_task,(float)this->getSleepTime());
00062         this->setObserving(true);
00063      }
00064  }
00065  
00066  // begin observing...
00067  void TickerResourceObserver::stopObservation() {
00068      this->setObserving(false);
00069  }
00070 
00071  // halt the underlying observer mechanism
00072  void TickerResourceObserver::halt() {
00073      this->m_ticker.detach();
00074  }
00075  
00076  #endif // CONNECTOR_USING_TICKER