controller.h

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#pragma once
/***************************************************/
/***************************************************/

#include <ros/node_handle.h>
#include <pr2_mechanism_model/robot.h>
#include <pr2_controller_interface/controller_provider.h>
#include <controller_interface/controller.h>

namespace pr2_controller_interface
{

class Controller : public controller_interface::Controller<pr2_mechanism_model::RobotState >
{
public:
  enum {BEFORE_ME, AFTER_ME};

  Controller(): state_(CONSTRUCTED){}
  virtual ~Controller(){}

  void starting(const ros::Time& time) { starting(); }
  void update  (const ros::Time& time, const ros::Duration& period) { update();   }
  void stopping(const ros::Time& time) { stopping(); }

  virtual void starting() {};

  virtual void update(void) = 0;

  virtual void stopping() {};

  virtual bool init(pr2_mechanism_model::RobotState *robot, ros::NodeHandle &n) = 0;

  template<class ControllerType> bool getController(const std::string& name, int sched, ControllerType*& c)
  {
    if (contr_prov_ == NULL){
      ROS_ERROR("No valid pointer to a controller provider exists");
      return false;
    }
    if (!contr_prov_->getControllerByName(name, c)){
      ROS_ERROR("Could not find controller %s", name.c_str());
      return false;
    }
    if (sched == BEFORE_ME) before_list_.push_back(name);
    else if (sched == AFTER_ME) after_list_.push_back(name);
    else{
      ROS_ERROR("No valid scheduling specified. Need BEFORE_ME or AFTER_ME in getController function");
      return false;
    }
    return true;
  }

  bool isRunning()
  {
    return (state_ == RUNNING);
  }

  void updateRequest()
  {
    if (state_ == RUNNING)
      update();
  }

  bool startRequest()
  {
    // start succeeds even if the controller was already started
    if (state_ == RUNNING || state_ == INITIALIZED){
      starting();
      state_ = RUNNING;
      return true;
    }
    else
      return false;
  }


  bool stopRequest()
  {
    // stop succeeds even if the controller was already stopped
    if (state_ == RUNNING || state_ == INITIALIZED){
      stopping();
      state_ = INITIALIZED;
      return true;
    }
    else
      return false;
  }

  bool initRequest(ControllerProvider* cp, pr2_mechanism_model::RobotState *robot, ros::NodeHandle &n)
  {
    contr_prov_ = cp;

    if (state_ != CONSTRUCTED)
      return false;
    else
    {
      // initialize
      if (!init(robot, n))
        return false;
      state_ = INITIALIZED;

      return true;
    }
  }


  std::vector<std::string> before_list_, after_list_;

  enum {CONSTRUCTED, INITIALIZED, RUNNING} state_;

private:
  Controller(const Controller &c);
  Controller& operator =(const Controller &c);
  ControllerProvider* contr_prov_;

};

}