publisher.h

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/*
 * Copyright (C) 2009, Willow Garage, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *   * Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *   * 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.
 *   * Neither the names of Stanford University or Willow Garage, Inc. 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
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#ifndef ROSCPP_PUBLISHER_HANDLE_H
#define ROSCPP_PUBLISHER_HANDLE_H

#include "ros/forwards.h"
#include "ros/common.h"
#include "ros/message.h"
#include "ros/serialization.h"
#include <boost/bind.hpp>

namespace ros
{
  class ROSCPP_DECL Publisher
  {
  public:
    Publisher() {}
    Publisher(const Publisher& rhs);
    ~Publisher();

    template <typename M>
      void publish(const boost::shared_ptr<M>& message) const
    {
      using namespace serialization;

      if (!impl_)
        {
          ROS_ASSERT_MSG(false, "Call to publish() on an invalid Publisher");
          return;
        }

      if (!impl_->isValid())
        {
          ROS_ASSERT_MSG(false, "Call to publish() on an invalid Publisher (topic [%s])", impl_->topic_.c_str());
          return;
        }

      ROS_ASSERT_MSG(impl_->md5sum_ != "*" || impl_->md5sum_ == mt::md5sum<M>(*message), 
                     "Trying to publish message of type [%s/%s] on a publisher with type [%s/%s]",
                     impl_->datatype_.c_str(), impl_->md5sum_.c_str(), 
                     mt::datatype<M>(*message), mt::md5sum<M>(*message));

      SerializedMessage m;
      m.type_info = &typeid(M);
      m.message = message;

      publish(boost::bind(serializeMessage<M>, boost::ref(*message)), m);
    }

    template <typename M>
      void publish(const M& message) const
    {
      using namespace serialization;
      namespace mt = ros::message_traits;

      if (!impl_)
        {
          ROS_ASSERT_MSG(false, "Call to publish() on an invalid Publisher");
          return;
        }

      if (!impl_->isValid())
        {
          ROS_ASSERT_MSG(false, "Call to publish() on an invalid Publisher (topic [%s])", impl_->topic_.c_str());
          return;
        }

      ROS_ASSERT_MSG(impl_->md5sum_ != "*" || impl_->md5sum_ == mt::md5sum<M>(message), 
                     "Trying to publish message of type [%s/%s] on a publisher with type [%s/%s]",
                     impl_->datatype_.c_str(), impl_->md5sum_.c_str(), 
                     mt::datatype<M>(message), mt::md5sum<M>(message));

      SerializedMessage m;
      publish(boost::bind(serializeMessage<M>, boost::ref(message)), m);
    }

    void shutdown();

    std::string getTopic() const;

    uint32_t getNumSubscribers() const;

    bool isLatched() const;

    operator void*() const { return (impl_ && impl_->isValid()) ? (void*)1 : (void*)0; }

    bool operator<(const Publisher& rhs) const
    {
      return impl_ < rhs.impl_;
    }

    bool operator==(const Publisher& rhs) const
    {
      return impl_ == rhs.impl_;
    }

    bool operator!=(const Publisher& rhs) const
    {
      return impl_ != rhs.impl_;
    }

  private:

    Publisher(const std::string& topic, const std::string& md5sum, 
              const std::string& datatype, const NodeHandle& node_handle, 
              const SubscriberCallbacksPtr& callbacks);

    void publish(const boost::function<SerializedMessage(void)>& serfunc, SerializedMessage& m) const;
    void incrementSequence() const;

    class ROSCPP_DECL Impl
    {
    public:
      Impl();
      ~Impl();

      void unadvertise();
      bool isValid() const;

      std::string topic_;
      std::string md5sum_;
      std::string datatype_;
      NodeHandlePtr node_handle_;
      SubscriberCallbacksPtr callbacks_;
      bool unadvertised_;
    };
    typedef boost::shared_ptr<Impl> ImplPtr;
    typedef boost::weak_ptr<Impl> ImplWPtr;

    ImplPtr impl_;

    friend class NodeHandle;
    friend class NodeHandleBackingCollection;
  };

  typedef std::vector<Publisher> V_Publisher;
}

#endif // ROSCPP_PUBLISHER_HANDLE_H