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+/****************************************************************************
+ *
+ * Copyright (c) 2014 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ * used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file px4_subscriber.h
+ *
+ * PX4 Middleware Wrapper Subscriber
+ */
+#pragma once
+
+#include <functional>
+#include <type_traits>
+
+#if defined(__PX4_ROS)
+/* includes when building for ros */
+#include "ros/ros.h"
+#else
+/* includes when building for NuttX */
+#include <uORB/Subscription.hpp>
+#include <containers/List.hpp>
+#include "px4_nodehandle.h"
+#endif
+
+namespace px4
+{
+
+/**
+ * Untemplated subscriber base class
+ * */
+class __EXPORT SubscriberBase
+{
+public:
+ SubscriberBase() {};
+ virtual ~SubscriberBase() {};
+
+};
+
+/**
+ * Subscriber class which is used by nodehandle
+ */
+template<typename T>
+class __EXPORT Subscriber :
+ public SubscriberBase
+{
+public:
+ Subscriber() :
+ SubscriberBase(),
+ _msg_current()
+ {};
+
+ virtual ~Subscriber() {}
+
+ /* Accessors*/
+ /**
+ * Get the last message value
+ */
+ virtual T& get() {return _msg_current;}
+
+ /**
+ * Get the last native message value
+ */
+ virtual decltype(((T*)nullptr)->data()) data()
+ {
+ return _msg_current.data();
+ }
+
+protected:
+ T _msg_current; /**< Current Message value */
+};
+
+#if defined(__PX4_ROS)
+/**
+ * Subscriber class that is templated with the ros n message type
+ */
+template<typename T>
+class SubscriberROS :
+ public Subscriber<T>
+{
+public:
+ /**
+ * Construct Subscriber without a callback function
+ */
+ SubscriberROS(ros::NodeHandle *rnh) :
+ px4::Subscriber<T>(),
+ _cbf(NULL),
+ _ros_sub(rnh->subscribe(T::handle(), kQueueSizeDefault, &SubscriberROS<T>::callback, this))
+ {}
+
+ /**
+ * Construct Subscriber by providing a callback function
+ */
+ SubscriberROS(ros::NodeHandle *rnh, std::function<void(const T &)> cbf) :
+ _cbf(cbf),
+ _ros_sub(rnh->subscribe(T::handle(), kQueueSizeDefault, &SubscriberROS<T>::callback, this))
+ {}
+
+ virtual ~SubscriberROS() {};
+
+protected:
+ static const uint32_t kQueueSizeDefault = 1; /**< Size of queue for ROS */
+
+ /**
+ * Called on topic update, saves the current message and then calls the provided callback function
+ * needs to use the native type as it is called by ROS
+ */
+ void callback(const typename std::remove_reference<decltype(((T*)nullptr)->data())>::type &msg)
+ {
+ /* Store data */
+ this->_msg_current.data() = msg;
+
+ /* Call callback */
+ if (_cbf != NULL) {
+ _cbf(this->get());
+ }
+
+ }
+
+ ros::Subscriber _ros_sub; /**< Handle to ros subscriber */
+ std::function<void(const T &)> _cbf; /**< Callback that the user provided on the subscription */
+
+};
+
+#else // Building for NuttX
+/**
+ * Because we maintain a list of subscribers we need a node class
+ */
+class __EXPORT SubscriberNode :
+ public ListNode<SubscriberNode *>
+{
+public:
+ SubscriberNode(unsigned interval) :
+ ListNode(),
+ _interval(interval)
+ {}
+
+ virtual ~SubscriberNode() {}
+
+ virtual void update() = 0;
+
+ virtual int getUORBHandle() = 0;
+
+ unsigned get_interval() { return _interval; }
+
+protected:
+ unsigned _interval;
+
+};
+
+/**
+ * Subscriber class that is templated with the uorb subscription message type
+ */
+template<typename T>
+class __EXPORT SubscriberUORB :
+ public Subscriber<T>,
+ public SubscriberNode
+{
+public:
+
+ /**
+ * Construct SubscriberUORB by providing orb meta data without callback
+ * @param interval Minimal interval between calls to callback
+ */
+ SubscriberUORB(unsigned interval) :
+ SubscriberNode(interval),
+ _uorb_sub(new uORB::SubscriptionBase(T::handle(), interval))
+ {}
+
+ virtual ~SubscriberUORB() {
+ delete _uorb_sub;
+ };
+
+ /**
+ * Update Subscription
+ * Invoked by the list traversal in NodeHandle::spinOnce
+ */
+ virtual void update()
+ {
+ if (!_uorb_sub->updated()) {
+ /* Topic not updated, do not call callback */
+ return;
+ }
+
+ _uorb_sub->update(get_void_ptr());
+ };
+
+ /* Accessors*/
+ int getUORBHandle() { return _uorb_sub->getHandle(); }
+
+protected:
+ uORB::SubscriptionBase * _uorb_sub; /**< Handle to the subscription */
+
+ typename std::remove_reference<decltype(((T*)nullptr)->data())>::type getUORBData()
+ {
+ return (typename std::remove_reference<decltype(((T*)nullptr)->data())>::type)*_uorb_sub;
+ }
+
+ /**
+ * Get void pointer to last message value
+ */
+ void *get_void_ptr() { return (void *)&(this->_msg_current.data()); }
+
+};
+
+//XXX reduce to one class with overloaded constructor?
+template<typename T>
+class __EXPORT SubscriberUORBCallback :
+ public SubscriberUORB<T>
+{
+public:
+ /**
+ * Construct SubscriberUORBCallback by providing orb meta data
+ * @param cbf Callback, executed on receiving a new message
+ * @param interval Minimal interval between calls to callback
+ */
+ SubscriberUORBCallback(unsigned interval,
+ std::function<void(const T &)> cbf) :
+ SubscriberUORB<T>(interval),
+ _cbf(cbf)
+ {}
+
+ virtual ~SubscriberUORBCallback() {};
+
+ /**
+ * Update Subscription
+ * Invoked by the list traversal in NodeHandle::spinOnce
+ * If new data is available the callback is called
+ */
+ virtual void update()
+ {
+ if (!this->_uorb_sub->updated()) {
+ /* Topic not updated, do not call callback */
+ return;
+ }
+
+ /* get latest data */
+ this->_uorb_sub->update(this->get_void_ptr());
+
+
+ /* Check if there is a callback */
+ if (_cbf == nullptr) {
+ return;
+ }
+
+ /* Call callback which performs actions based on this data */
+ _cbf(Subscriber<T>::get());
+
+ };
+
+protected:
+ std::function<void(const T &)> _cbf; /**< Callback that the user provided on the subscription */
+};
+#endif
+
+}