EventSystem.cc

Go to the documentation of this file.

// -*- lsst-c++ -*-

/* 
 * LSST Data Management System
 * Copyright 2008, 2009, 2010 LSST Corporation.
 * 
 * This product includes software developed by the
 * LSST Project (http://www.lsst.org/).
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program 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 General Public License for more details.
 * 
 * You should have received a copy of the LSST License Statement and 
 * the GNU General Public License along with this program.  If not, 
 * see <http://www.lsstcorp.org/LegalNotices/>.
 */
 
#include <iomanip>
#include <sstream>
#include <stdexcept>


#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>

#include "lsst/daf/base/PropertySet.h"
#include "lsst/pex/policy/Policy.h"
#include "lsst/pex/exceptions.h"
#include "lsst/ctrl/events/EventLog.h"
#include "lsst/ctrl/events/EventSystem.h"
#include "lsst/ctrl/events/EventLibrary.h"
#include "lsst/ctrl/events/Event.h"
#include "lsst/ctrl/events/StatusEvent.h"
#include "lsst/ctrl/events/CommandEvent.h"

namespace pexExceptions =lsst::pex::exceptions;

using namespace std;

namespace lsst {
namespace ctrl {
namespace events {
EventSystem::EventSystem() {
    EventLibrary().initializeLibrary();
}

EventSystem::~EventSystem() {
}

EventSystem& EventSystem::getDefaultEventSystem() {
    if (defaultEventSystem == 0) {

        // create the _IPId here, rather than
        // reconstructing it every time we create an
        // identificationId

        char buf [255];
        struct hostent *ent;
        unsigned char a,b,c,d;

        gethostname(buf, 255) ;
        ent = (struct hostent *)gethostbyname(buf) ;

        a = ent->h_addr_list[0][0] & 0xFF;
        b = ent->h_addr_list[0][1] & 0xFF;
        c = ent->h_addr_list[0][2] & 0xFF;
        d = ent->h_addr_list[0][3] & 0xFF;

        _IPId = (a << 24) | (b << 16) | (c << 8) | d;
  
        // create the default EventSystem object
        defaultEventSystem = new EventSystem();
    }
    return *defaultEventSystem;

}

EventSystem *EventSystem::defaultEventSystem = 0;
int EventSystem::_IPId = 0;
short EventSystem::_localId = 0;

void EventSystem::createTransmitter(const pexPolicy::Policy& policy) {
    boost::shared_ptr<EventTransmitter> transmitter(new EventTransmitter(policy));
    boost::shared_ptr<EventTransmitter> transmitter2;
    if ((transmitter2 = getTransmitter(transmitter->getTopicName())) == 0) {
        _transmitters.push_back(transmitter);
        return;
    }
    throw LSST_EXCEPT(pexExceptions::RuntimeError, "topic "+ transmitter->getTopicName() + " is already registered with EventSystem");
}

void EventSystem::createTransmitter(const std::string& hostName, const std::string& topicName, int hostPort) {
    boost::shared_ptr<EventTransmitter> transmitter;
    if ((transmitter = getTransmitter(topicName)) == 0) {
        boost::shared_ptr<EventTransmitter> transmitter(new EventTransmitter(hostName, topicName, hostPort));
        _transmitters.push_back(transmitter);
        return;
    }
    throw LSST_EXCEPT(pexExceptions::RuntimeError, "topic "+ topicName + " is already registered with EventSystem");
}

void EventSystem::createReceiver(const pexPolicy::Policy& policy) {
    boost::shared_ptr<EventReceiver> receiver(new EventReceiver(policy));
    boost::shared_ptr<EventReceiver> receiver2;
    if ((receiver2 = getReceiver(receiver->getTopicName())) == 0) {
        _receivers.push_back(receiver);
        return;
    }
    throw LSST_EXCEPT(pexExceptions::RuntimeError, "topic " + receiver->getTopicName() + " is already registered with EventSystem");
}

void EventSystem::createReceiver(const std::string& hostName, const std::string& topicName, int hostPort) {
    boost::shared_ptr<EventReceiver> receiver;
    if ((receiver = getReceiver(topicName)) == 0) {
        boost::shared_ptr<EventReceiver> receiver(new EventReceiver(hostName, topicName, hostPort));
        _receivers.push_back(receiver);
        return;
    }
    throw LSST_EXCEPT(pexExceptions::RuntimeError, "topic "+ topicName + " is already registered with EventSystem");
}

void EventSystem::createReceiver(const std::string& hostName, const std::string& topicName, const std::string& selector, int hostPort) {
    boost::shared_ptr<EventReceiver> receiver(new EventReceiver(hostName, topicName, selector, hostPort));
    _receivers.push_back(receiver);
}


void EventSystem::publishEvent(const std::string& topicName, Event& event) {
    boost::shared_ptr<EventTransmitter> transmitter;
    if ((transmitter = getTransmitter(topicName)) == 0) {
        throw LSST_EXCEPT(pexExceptions::RuntimeError, "topic "+ topicName + " is not registered with EventSystem");
    }
    transmitter->publishEvent(event);
}

boost::shared_ptr<EventTransmitter> EventSystem::getTransmitter(const std::string& name) {
    list<boost::shared_ptr<EventTransmitter> >::iterator i;
    for (i = _transmitters.begin(); i != _transmitters.end(); i++) {
        if ((*i)->getTopicName() == name)
            return *i;
    }
    return boost::shared_ptr<EventTransmitter>();
}


Event* EventSystem::receiveEvent(const std::string& topicName) {
    return receiveEvent(topicName, EventReceiver::infiniteTimeout);
}

Event* EventSystem::receiveEvent(const std::string& topicName, const long timeout) {
    boost::shared_ptr<EventReceiver> receiver;
    if ((receiver = getReceiver(topicName)) == 0) {
        throw LSST_EXCEPT(pexExceptions::RuntimeError, "Topic "+ topicName +" is not registered with EventSystem");
    }

    return receiver->receiveEvent(timeout);
}


boost::shared_ptr<EventReceiver> EventSystem::getReceiver(const std::string& name) {
    list<boost::shared_ptr<EventReceiver> >::iterator i;
    for (i = _receivers.begin(); i != _receivers.end(); i++) {
        if ((*i)->getTopicName() == name)
            return *i;
    }
    return boost::shared_ptr<EventReceiver>();
}

int64_t EventSystem::createOriginatorId() {
    int64_t pid = getpid();
    
    int64_t originatorId = _IPId & 0x0FFFFFFFF;
    int64_t locid = _localId & 0x7FFF;

    originatorId = (locid << 49) | (pid << 32) | originatorId;

    _localId++;
    return originatorId;
}

int EventSystem::extractIPId(int64_t identificationId) {
    return identificationId & 0xFFFFFFFF;
}

int EventSystem::extractProcessId(int64_t identificationId) {
    return (identificationId & 0x1FFFF00000000LL) >> 32;
}

short EventSystem::extractLocalId(int64_t identificationId) {
    return (identificationId & 0xFFFE000000000000LL) >> 49;
}

StatusEvent* EventSystem::castToStatusEvent(Event* event) {
    return (StatusEvent *)event;
}

CommandEvent* EventSystem::castToCommandEvent(Event* event) {
    return (CommandEvent *)event;
}

}
}
}