text: /* Copyright (c) 2006-2020, Universities Space Research Association (USRA).
  *  All rights reserved.
  *
  * 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 name of the Universities Space Research Association 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 USRA ``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 USRA 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.
  */
  
  #ifndef _H__Subscriber
  #define _H__Subscriber
  
  #include <string>
  
  // Forward declarations
  namespace PLEXIL
  {
    class Value;
    class Command;
  }
  
  // A Subscriber is any object that can accept these calls.
  class Subscriber
  {
  public:
    virtual void receiveValue (const std::string& state_name,
                               const PLEXIL::Value& val) = 0;
    virtual void receiveValue (const std::string& state_name,
                               const PLEXIL::Value& val,
                               const PLEXIL::Value& arg) = 0;
    virtual void receiveValue (const std::string& state_name,
                               const PLEXIL::Value& val,
                               const PLEXIL::Value& arg1, const PLEXIL::Value& arg2) = 0;
    virtual void receiveCommandReceived (PLEXIL::Command* cmd) = 0;
    virtual void receiveCommandSuccess (PLEXIL::Command* cmd) = 0;
  };
  
  // A Subscriber registers for data with this function.
  void setSubscriber(Subscriber *i);
  
  #endif
  