Diff: source/TickerResourceObserver.cpp

Revision:

0:1f1f55e73248

Child:

13:9edad7677211

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/TickerResourceObserver.cpp	Fri Feb 19 17:32:14 2016 +0000
@@ -0,0 +1,69 @@
+/**
+ * @file    TickerResourceObserver.cpp
+ * @brief   mbed CoAP DynamicResource Ticker-based observer (implementation)
+ * @author  Doug Anson/Chris Paola
+ * @version 1.0
+ * @see
+ *
+ * Copyright (c) 2014
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ 
+ #include "TickerResourceObserver.h"
+ 
+ // DEBUG
+ //DigitalOut __ticker_led(LED2);
+  
+ // constructor
+ TickerResourceObserver::TickerResourceObserver(DynamicResource *resource,int sleep_time) : 
+                                    ResourceObserver(resource,(int)(sleep_time/1000)) {
+     this->setObserving(false);
+     // DEBUG
+     std::printf("TickerResourceObserver being used for %s (sleep_time=%d)\r\n",resource->getFullName().c_str(),sleep_time);
+ }
+  
+ // destructor
+ TickerResourceObserver::~TickerResourceObserver() {
+     this->stopObservation();
+ }
+
+ // notifier
+ void TickerResourceObserver::observationNotifier() {
+     if (this->isObserving() == true && this->getResource() != NULL) {
+         //
+         // implementsObservation(): This switch denotes whether this ticker resource generates its own observations or relies on the ticker (time-based) mechanism.
+         //   -- if resource itself doesn't implement it, then we can call notify() with the get() on each heartbeat of the tickered resource (see note below)
+         //   -- otherwise, we let the resource itself call observe() as part of its observation implementation
+         //
+         // note: this is independent of whether the resource, when declared, is defined as an observable resource or not.  If not, then notify() wont be called 
+         //       as there will be no observations for this resource regardless of this switch value. 
+         //
+         bool do_notify = !(this->getResource()->implementsObservation());
+         this->getResource()->observe();
+         //__ticker_led = !__ticker_led;
+     }
+ }
+ 
+ // begin observing...
+ void TickerResourceObserver::beginObservation() {
+     if (this->isObserving() == false) {
+        this->m_ticker.attach(this,&TickerResourceObserver::observationNotifier,(float)this->getSleepTime());
+        this->setObserving(true);
+     }
+ }
+ 
+ // begin observing...
+ void TickerResourceObserver::stopObservation() {
+     this->setObserving(false);
+ }
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