Doug Anson / mbedConnectorInterfaceWithDM

mbed Connector Interface simplification API on top of mbed-client

Fork of mbedConnectorInterfaceV3 by Doug Anson

NOTE:

This repo has been replaced with https://github.com/ARMmbed/mbedConnectorInterface. No further updates will occur with this repo. Please use the github repo instead. Thanks!

source/ThreadedResourceObserver.cpp@0:1f1f55e73248, 2016-02-19 (annotated)

Committer:
ansond
Date:
Fri Feb 19 17:32:14 2016 +0000
Revision:
0:1f1f55e73248
Child:
13:9edad7677211
initial checkin

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ansond 0:1f1f55e73248 1 /**
ansond 0:1f1f55e73248 2 * @file ThreadedResourceObserver.cpp
ansond 0:1f1f55e73248 3 * @brief mbed CoAP DynamicResource Thread-based observer (implementation)
ansond 0:1f1f55e73248 4 * @author Doug Anson/Chris Paola
ansond 0:1f1f55e73248 5 * @version 1.0
ansond 0:1f1f55e73248 6 * @see
ansond 0:1f1f55e73248 7 *
ansond 0:1f1f55e73248 8 * Copyright (c) 2014
ansond 0:1f1f55e73248 9 *
ansond 0:1f1f55e73248 10 * Licensed under the Apache License, Version 2.0 (the "License");
ansond 0:1f1f55e73248 11 * you may not use this file except in compliance with the License.
ansond 0:1f1f55e73248 12 * You may obtain a copy of the License at
ansond 0:1f1f55e73248 13 *
ansond 0:1f1f55e73248 14 * http://www.apache.org/licenses/LICENSE-2.0
ansond 0:1f1f55e73248 15 *
ansond 0:1f1f55e73248 16 * Unless required by applicable law or agreed to in writing, software
ansond 0:1f1f55e73248 17 * distributed under the License is distributed on an "AS IS" BASIS,
ansond 0:1f1f55e73248 18 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
ansond 0:1f1f55e73248 19 * See the License for the specific language governing permissions and
ansond 0:1f1f55e73248 20 * limitations under the License.
ansond 0:1f1f55e73248 21 */
ansond 0:1f1f55e73248 22
ansond 0:1f1f55e73248 23 #include "ThreadedResourceObserver.h"
ansond 0:1f1f55e73248 24
ansond 0:1f1f55e73248 25 #ifdef CONNECTOR_USING_THREADS
ansond 0:1f1f55e73248 26 // DEBUG
ansond 0:1f1f55e73248 27 //DigitalOut __threaded_led(LED2);
ansond 0:1f1f55e73248 28 #endif
ansond 0:1f1f55e73248 29
ansond 0:1f1f55e73248 30 // constructor
ansond 0:1f1f55e73248 31 ThreadedResourceObserver::ThreadedResourceObserver(DynamicResource *resource,int sleep_time) :
ansond 0:1f1f55e73248 32 ResourceObserver(resource,sleep_time)
ansond 0:1f1f55e73248 33 #ifdef CONNECTOR_USING_THREADS
ansond 0:1f1f55e73248 34 ,m_observation_thread(&ThreadedResourceObserver::_observation_notifier,this)
ansond 0:1f1f55e73248 35 #endif
ansond 0:1f1f55e73248 36 {
ansond 0:1f1f55e73248 37 this->setObserving(false);
ansond 0:1f1f55e73248 38 // DEBUG
ansond 0:1f1f55e73248 39 std::printf("ThreadedResourceObserver being used for %s (sleep_time=%d)\r\n",resource->getFullName().c_str(),sleep_time);
ansond 0:1f1f55e73248 40 }
ansond 0:1f1f55e73248 41
ansond 0:1f1f55e73248 42 // destructor
ansond 0:1f1f55e73248 43 ThreadedResourceObserver::~ThreadedResourceObserver() {
ansond 0:1f1f55e73248 44 this->stopObservation();
ansond 0:1f1f55e73248 45 #ifdef CONNECTOR_USING_THREADS
ansond 0:1f1f55e73248 46 this->m_observation_thread.terminate();
ansond 0:1f1f55e73248 47 #endif
ansond 0:1f1f55e73248 48 }
ansond 0:1f1f55e73248 49
ansond 0:1f1f55e73248 50 // notifier
ansond 0:1f1f55e73248 51 void ThreadedResourceObserver::_observation_notifier(void const *instance) {
ansond 0:1f1f55e73248 52 #ifdef CONNECTOR_USING_THREADS
ansond 0:1f1f55e73248 53 ThreadedResourceObserver *me = (ThreadedResourceObserver *)instance;
ansond 0:1f1f55e73248 54 while(true) {
ansond 0:1f1f55e73248 55 Thread::wait(me->getSleepTime());
ansond 0:1f1f55e73248 56 if (me->isObserving() == true && me->getResource() != NULL) {
ansond 0:1f1f55e73248 57 //
ansond 0:1f1f55e73248 58 // implementsObservation(): This switch denotes whether this threaded resource generates its own observations or relies on the heartbeat (time-based) mechanism.
ansond 0:1f1f55e73248 59 // -- if resource itself doesn't implement it, then we can call notify() with the get() on each heartbeat of the threaded resource (see note below)
ansond 0:1f1f55e73248 60 // -- otherwise, we let the resource itself call observe() as part of its observation implementation
ansond 0:1f1f55e73248 61 //
ansond 0:1f1f55e73248 62 // 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
ansond 0:1f1f55e73248 63 // as there will be no observations for this resource regardless of this switch value.
ansond 0:1f1f55e73248 64 //
ansond 0:1f1f55e73248 65 bool do_notify = !(me->getResource()->implementsObservation());
ansond 0:1f1f55e73248 66 me->getResource()->observe();
ansond 0:1f1f55e73248 67 //__threaded_led = !__threaded_led;
ansond 0:1f1f55e73248 68 }
ansond 0:1f1f55e73248 69 }
ansond 0:1f1f55e73248 70 #endif
ansond 0:1f1f55e73248 71 }
ansond 0:1f1f55e73248 72
ansond 0:1f1f55e73248 73 // begin observing...
ansond 0:1f1f55e73248 74 void ThreadedResourceObserver::beginObservation() {
ansond 0:1f1f55e73248 75 this->setObserving(true);
ansond 0:1f1f55e73248 76 }
ansond 0:1f1f55e73248 77
ansond 0:1f1f55e73248 78 // stop observing...
ansond 0:1f1f55e73248 79 void ThreadedResourceObserver::stopObservation() {
ansond 0:1f1f55e73248 80 this->setObserving(false);
ansond 0:1f1f55e73248 81 }