message_manager.cpp

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/*
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 * Copyright (c) 2011, Southwest Research Institute
 * All rights reserved.
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 *       * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
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 *       documentation and/or other materials provided with the distribution.
 *       * Neither the name of the Southwest Research Institute, nor the names
 *       of its contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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#ifndef FLATHEADERS
#include "simple_message/message_manager.h"
#include "simple_message/log_wrapper.h"
#include "simple_message/simple_message.h"
#else
#include "message_manager.h"
#include "log_wrapper.h"
#include "simple_message.h"
#endif
 
// remove ROS after Melodic (bw compat for #262)
#if defined(SIMPLE_MESSAGE_USE_ROS) || defined(ROS)
#include "ros/ros.h"
#else
#include "unistd.h"
#endif
 
#include <thread>
#include <chrono>
 
using namespace industrial::smpl_msg_connection;
using namespace industrial::message_handler;
using namespace industrial::simple_message;
using namespace industrial::comms_fault_handler;
using namespace industrial::simple_comms_fault_handler;
 
namespace industrial
{
namespace message_manager
{
 
MessageManager::MessageManager()
{
  this->num_handlers_ = 0;
  for (unsigned int i = 0; i < this->getMaxNumHandlers(); i++)
  {
    this->handlers_[i] = NULL;
  }
  this->comms_hndlr_ = NULL;
}
 
MessageManager::~MessageManager()
{
 
}
 
bool MessageManager::init(SmplMsgConnection* connection)
{
  bool rtn = false;
 
  LOG_INFO("Initializing message manager with default comms fault handler");
 
 
  if (NULL != connection)
  {
    this->getDefaultCommsFaultHandler().init(connection);
    this->init(connection, (CommsFaultHandler*)(&this->getDefaultCommsFaultHandler()));
    rtn = true;
  }
  else
  {
    LOG_ERROR("NULL connection passed into manager init");
    rtn = false;
  }
 
  return rtn;
}
 
bool MessageManager::init(SmplMsgConnection* connection, CommsFaultHandler* fault_handler)
{
  bool rtn = false;
 
    LOG_INFO("Initializing message manager");
 
    if (NULL != connection && NULL != fault_handler)
    {
      this->setConnection(connection);
      this->getPingHandler().init(connection);
      this->setCommsFaultHandler(fault_handler);
 
      if (this->add(&this->getPingHandler()))
      {
        rtn = true;
      }
      else
      {
        rtn = false;
        LOG_WARN("Failed to add ping handler, manager won't respond to pings");
      }
 
    }
    else
    {
      LOG_ERROR("NULL connection or NULL fault handler passed into manager init");
      rtn = false;
    }
 
    return rtn;
  }
 
 
 
void MessageManager::spinOnce()
{
  SimpleMessage msg;
  MessageHandler* handler = NULL;
 
  if(!this->getConnection()->isConnected())
  {
    this->getCommsFaultHandler()->connectionFailCB();
  }
 
  if (this->getConnection()->receiveMsg(msg))
  {
    LOG_COMM("Message received");
    handler = this->getHandler(msg.getMessageType());
 
    if (NULL != handler)
    {
      LOG_DEBUG("Executing handler callback for message type: %d", handler->getMsgType());
      handler->callback(msg);
    }
    else
    {
      if (CommTypes::SERVICE_REQUEST == msg.getCommType())
      {
        simple_message::SimpleMessage fail;
        fail.init(msg.getMessageType(), CommTypes::SERVICE_REPLY, ReplyTypes::FAILURE);
        this->getConnection()->sendMsg(fail);
        LOG_WARN("Unhandled message type encounters, sending failure reply");
      }
      LOG_ERROR("Message callback for message type: %d, not executed", msg.getMessageType());
    }
  }
  else
  {
    LOG_ERROR("Failed to receive incoming message");
    this->getCommsFaultHandler()->sendFailCB();
  }
}
 
int ms_per_clock;
void mySleep(int sec)
{
#ifdef SIMPLE_MESSAGE_MOTOPLUS
  if (ms_per_clock <= 0)
    ms_per_clock = mpGetRtc();
 
  mpTaskDelay(sec * 1000 / ms_per_clock);
#else
  std::this_thread::sleep_for(std::chrono::seconds(sec));
#endif
}
 
void MessageManager::spin()
{
  LOG_INFO("Entering message manager spin loop");
// remove ROS after Melodic (bw compat for #262)
#if defined(SIMPLE_MESSAGE_USE_ROS) || defined(ROS)
  while (ros::ok())
#else
  while (true)
#endif
  {
    this->spinOnce();
 
    // Throttle loop speed if waiting for a re-connection
    if (!this->getConnection()->isConnected())
      mySleep(5);
  }
}
 
bool MessageManager::add(MessageHandler * handler, bool allow_replace)
{
  int idx = -1;
  bool rtn = false;
 
  if (NULL != handler)
  {
    // If get handler returns -1 then a hander for the message type
    // does not exist, and a new one should be added
    idx = getHandlerIdx(handler->getMsgType());
    if (0 > idx)
    {
      if (this->getMaxNumHandlers() > this->getNumHandlers())
      {
        this->handlers_[this->getNumHandlers()] = handler;
        this->setNumHandlers(this->getNumHandlers() + 1);
        LOG_INFO("Added message handler for message type: %d", handler->getMsgType());
        rtn = true;
      }
      else
      {
        LOG_ERROR("Max number of handlers exceeded");
        rtn = false;
      }
    }
    else if (allow_replace)
    {
      this->handlers_[idx] = handler;
    }
    else
    {
      LOG_ERROR("Failed to add handler for: %d, handler already exists", handler->getMsgType());
      rtn = false;
    }
  }
  else
  {
    LOG_ERROR("NULL handler not added");
    rtn = false;
  }
  return rtn;
}
 
MessageHandler* MessageManager::getHandler(int msg_type)
{
  int idx = getHandlerIdx(msg_type);
 
  if (idx < 0)
    return NULL;
  else
    return this->handlers_[idx];
}
 
int MessageManager::getHandlerIdx(int msg_type)
{
  int rtn = -1;
  MessageHandler* temp = NULL;
 
  for (unsigned int i = 0; i < this->getMaxNumHandlers(); i++)
  {
    temp = this->handlers_[i];
    if (NULL == temp) break;  // end of handler-list
 
    if (temp->getMsgType() == msg_type)
    {
        rtn = i;
        break;
    }
  }
 
  return rtn;
}
 
} // namespace message_manager
} // namespace industrial