/usr/include/image_transport/simple_publisher_plugin.h is in libimage-transport-dev 1.11.10-5.
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#ifndef IMAGE_TRANSPORT_SIMPLE_PUBLISHER_PLUGIN_H
#define IMAGE_TRANSPORT_SIMPLE_PUBLISHER_PLUGIN_H
#include "image_transport/publisher_plugin.h"
#include <boost/scoped_ptr.hpp>
namespace image_transport {
/**
* \brief Base class to simplify implementing most plugins to Publisher.
*
* This base class vastly simplifies implementing a PublisherPlugin in the common
* case that all communication with the matching SubscriberPlugin happens over a
* single ROS topic using a transport-specific message type. SimplePublisherPlugin
* is templated on the transport-specific message type.
*
* A subclass need implement only two methods:
* - getTransportName() from PublisherPlugin
* - publish() with an extra PublishFn argument
*
* For access to the parameter server and name remappings, use nh().
*
* getTopicToAdvertise() controls the name of the internal communication topic.
* It defaults to \<base topic\>/\<transport name\>.
*/
template <class M>
class SimplePublisherPlugin : public PublisherPlugin
{
public:
virtual ~SimplePublisherPlugin() {}
virtual uint32_t getNumSubscribers() const
{
if (simple_impl_) return simple_impl_->pub_.getNumSubscribers();
return 0;
}
virtual std::string getTopic() const
{
if (simple_impl_) return simple_impl_->pub_.getTopic();
return std::string();
}
virtual void publish(const sensor_msgs::Image& message) const
{
if (!simple_impl_ || !simple_impl_->pub_) {
ROS_ASSERT_MSG(false, "Call to publish() on an invalid image_transport::SimplePublisherPlugin");
return;
}
publish(message, bindInternalPublisher(simple_impl_->pub_));
}
virtual void shutdown()
{
if (simple_impl_) simple_impl_->pub_.shutdown();
}
protected:
virtual void advertiseImpl(ros::NodeHandle& nh, const std::string& base_topic, uint32_t queue_size,
const SubscriberStatusCallback& user_connect_cb,
const SubscriberStatusCallback& user_disconnect_cb,
const ros::VoidPtr& tracked_object, bool latch)
{
std::string transport_topic = getTopicToAdvertise(base_topic);
ros::NodeHandle param_nh(transport_topic);
simple_impl_.reset(new SimplePublisherPluginImpl(param_nh));
simple_impl_->pub_ = nh.advertise<M>(transport_topic, queue_size,
bindCB(user_connect_cb, &SimplePublisherPlugin::connectCallback),
bindCB(user_disconnect_cb, &SimplePublisherPlugin::disconnectCallback),
tracked_object, latch);
}
//! Generic function for publishing the internal message type.
typedef boost::function<void(const M&)> PublishFn;
/**
* \brief Publish an image using the specified publish function. Must be implemented by
* the subclass.
*
* The PublishFn publishes the transport-specific message type. This indirection allows
* SimpleSubscriberPlugin to use this function for both normal broadcast publishing and
* single subscriber publishing (in subscription callbacks).
*/
virtual void publish(const sensor_msgs::Image& message, const PublishFn& publish_fn) const = 0;
/**
* \brief Return the communication topic name for a given base topic.
*
* Defaults to \<base topic\>/\<transport name\>.
*/
virtual std::string getTopicToAdvertise(const std::string& base_topic) const
{
return base_topic + "/" + getTransportName();
}
/**
* \brief Function called when a subscriber connects to the internal publisher.
*
* Defaults to noop.
*/
virtual void connectCallback(const ros::SingleSubscriberPublisher& pub) {}
/**
* \brief Function called when a subscriber disconnects from the internal publisher.
*
* Defaults to noop.
*/
virtual void disconnectCallback(const ros::SingleSubscriberPublisher& pub) {}
/**
* \brief Returns the ros::NodeHandle to be used for parameter lookup.
*/
const ros::NodeHandle& nh() const
{
return simple_impl_->param_nh_;
}
/**
* \brief Returns the internal ros::Publisher.
*
* This really only exists so RawPublisher can implement no-copy intraprocess message
* passing easily.
*/
const ros::Publisher& getPublisher() const
{
ROS_ASSERT(simple_impl_);
return simple_impl_->pub_;
}
private:
struct SimplePublisherPluginImpl
{
SimplePublisherPluginImpl(const ros::NodeHandle& nh)
: param_nh_(nh)
{
}
const ros::NodeHandle param_nh_;
ros::Publisher pub_;
};
boost::scoped_ptr<SimplePublisherPluginImpl> simple_impl_;
typedef void (SimplePublisherPlugin::*SubscriberStatusMemFn)(const ros::SingleSubscriberPublisher& pub);
/**
* Binds the user callback to subscriberCB(), which acts as an intermediary to expose
* a publish(Image) interface to the user while publishing to an internal topic.
*/
ros::SubscriberStatusCallback bindCB(const SubscriberStatusCallback& user_cb,
SubscriberStatusMemFn internal_cb_fn)
{
ros::SubscriberStatusCallback internal_cb = boost::bind(internal_cb_fn, this, _1);
if (user_cb)
return boost::bind(&SimplePublisherPlugin::subscriberCB, this, _1, user_cb, internal_cb);
else
return internal_cb;
}
/**
* Forms the ros::SingleSubscriberPublisher for the internal communication topic into
* an image_transport::SingleSubscriberPublisher for Image messages and passes it
* to the user subscriber status callback.
*/
void subscriberCB(const ros::SingleSubscriberPublisher& ros_ssp,
const SubscriberStatusCallback& user_cb,
const ros::SubscriberStatusCallback& internal_cb)
{
// First call the internal callback (for sending setup headers, etc.)
internal_cb(ros_ssp);
// Construct a function object for publishing sensor_msgs::Image through the
// subclass-implemented publish() using the ros::SingleSubscriberPublisher to send
// messages of the transport-specific type.
typedef void (SimplePublisherPlugin::*PublishMemFn)(const sensor_msgs::Image&, const PublishFn&) const;
PublishMemFn pub_mem_fn = &SimplePublisherPlugin::publish;
ImagePublishFn image_publish_fn = boost::bind(pub_mem_fn, this, _1, bindInternalPublisher(ros_ssp));
SingleSubscriberPublisher ssp(ros_ssp.getSubscriberName(), getTopic(),
boost::bind(&SimplePublisherPlugin::getNumSubscribers, this),
image_publish_fn);
user_cb(ssp);
}
typedef boost::function<void(const sensor_msgs::Image&)> ImagePublishFn;
/**
* Returns a function object for publishing the transport-specific message type
* through some ROS publisher type.
*
* @param pub An object with method void publish(const M&)
*/
template <class PubT>
PublishFn bindInternalPublisher(const PubT& pub) const
{
// Bind PubT::publish(const Message&) as PublishFn
typedef void (PubT::*InternalPublishMemFn)(const M&) const;
InternalPublishMemFn internal_pub_mem_fn = &PubT::publish;
return boost::bind(internal_pub_mem_fn, &pub, _1);
}
};
} //namespace image_transport
#endif
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