acsncSimpleConsumer.h

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#ifndef SIMPLE_CONSUMER_H
#define SIMPLE_CONSUMER_H
/*    @(#) $Id: acsncSimpleConsumer.h,v 1.15 2012/02/13 21:12:59 javarias Exp $
 *    ALMA - Atacama Large Millimiter Array
 *    (c) Associated Universities Inc., 2002 
 *    (c) European Southern Observatory, 2002
 *    Copyright by ESO (in the framework of the ALMA collaboration)
 *    and Cosylab 2002, All rights reserved
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation; either
 *    version 2.1 of the License, or (at your option) any later version.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    Lesser General Public License for more details.
 *
 *    You should have received a copy of the GNU Lesser General Public
 *    License along with this library; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
 */

#include "acsncConsumer.h"
#include <acsutilAnyAide.h>
#include <RepeatGuard.h>
#include "acsncErrType.h"
#include "acsncBlockingQueue.h"

namespace nc {

template <class T> class SimpleConsumer : public Consumer
{
  public:
    typedef void (*eventHandlerFunction)(T eventData, void *handlerParam);

    SimpleConsumer(const char* channelName, const char* acsNCDomainName = 0);

    template <class J> void
    addSubscription(eventHandlerFunction templateFunction, void *handlerParam=0)
        {
            ACS_TRACE("SimpleConsumer::addSubscription");
            
            //yikes...the developer is trying to subscribe to multiple event
            //types from a singly templated class.
            if (templateFunction_mp!=0)
                {
                ACS_SHORT_LOG((LM_ERROR,
                               "SimpleConsumer::addSubscription unable to subscribe to multiple event types from this class!"));
                ACSErrTypeCommon::CouldntPerformActionExImpl err = ACSErrTypeCommon::CouldntPerformActionExImpl(__FILE__,
                                                                            __LINE__,
                                                                            "nc::SimpleConsumer::addSubscription");
                throw err.getCouldntPerformActionEx();
                }
            
            //save a reference to the eventHandlerFunction
            templateFunction_mp = templateFunction;
            
            //save the parameter to handler
            handlerParam_mp = handlerParam;
            
            //just call superclass implementation
            Consumer::addSubscription<J>();
        }
    
    virtual void 
    push_structured_event(const CosNotification::StructuredEvent &notification);

    bool stopConsumerThread();

    virtual void disconnect();

    void processEvent();

  protected:
    virtual ~SimpleConsumer();

    eventHandlerFunction templateFunction_mp;
    void *handlerParam_mp;

  private:
    void operator=(const SimpleConsumer&);

    SimpleConsumer(const SimpleConsumer&);


    void
    addSubscription(const char* type_name, eventHandlerFunction templateFunction, void *handlerParam=0);

    static void * dispatchEvent(void *args);

    blocking_queue<T> buffer;
    bool stop_thread;
    pthread_t dispatching_thread;

        RepeatGuard receiverTooSlowLogRepeatGuard;
        unsigned int numEventsDiscarded;

};
 }; 

#include "acsncSimpleConsumer.i"

#define ACS_NEW_SIMPLE_CONSUMER(simpConsumer_p, idlStruct, channelName, handlerFunction, handlerParam) \
{ \
  simpConsumer_p = new nc::SimpleConsumer<idlStruct>(channelName); \
  simpConsumer_p->addSubscription<idlStruct>(handlerFunction, handlerParam);\
}

#define ACS_NEW_SIMPLE_CONSUMER_WITH_DOMAIN(simpConsumer_p, idlStruct, channelName, domainname, handlerFunction, handlerParam) \
{ \
  simpConsumer_p = new nc::SimpleConsumer<idlStruct>(channelName,domainname); \
  simpConsumer_p->addSubscription<idlStruct>(handlerFunction, handlerParam);\
}

#endif