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//
// Copyright (c) ZeroC, Inc. All rights reserved.
//
#ifndef TOPIC_I_H
#define TOPIC_I_H
#include <IceStorm/IceStormInternal.h>
#include <IceStorm/Election.h>
#include <IceStorm/Instrumentation.h>
#include <IceStorm/Util.h>
#include <Ice/ObserverHelper.h>
#include <list>
namespace IceStorm
{
// Forward declarations
class PersistentInstance;
class Subscriber;
class TopicImpl
{
public:
static std::shared_ptr<TopicImpl> create(std::shared_ptr<PersistentInstance>,
const std::string&,
const Ice::Identity&,
const SubscriberRecordSeq&);
std::string getName() const;
std::shared_ptr<Ice::ObjectPrx> getPublisher() const;
std::shared_ptr<Ice::ObjectPrx> getNonReplicatedPublisher() const;
std::shared_ptr<Ice::ObjectPrx> subscribeAndGetPublisher(QoS, std::shared_ptr<Ice::ObjectPrx>);
void unsubscribe(const std::shared_ptr<Ice::ObjectPrx>&);
std::shared_ptr<TopicLinkPrx> getLinkProxy();
void link(const std::shared_ptr<TopicPrx>&, int);
void unlink(const std::shared_ptr<TopicPrx>&);
LinkInfoSeq getLinkInfoSeq() const;
Ice::IdentitySeq getSubscribers() const;
void reap(const Ice::IdentitySeq&);
void destroy();
IceStormElection::TopicContent getContent() const;
void update(const SubscriberRecordSeq&);
// Internal methods
bool destroyed() const;
Ice::Identity id() const;
std::shared_ptr<TopicPrx> proxy() const;
void shutdown();
void publish(bool, const EventDataSeq&);
// Observer methods.
void observerAddSubscriber(const IceStormElection::LogUpdate&, const SubscriberRecord&);
void observerRemoveSubscriber(const IceStormElection::LogUpdate&, const Ice::IdentitySeq&);
void observerDestroyTopic(const IceStormElection::LogUpdate&);
std::shared_ptr<Ice::Object> getServant() const;
void updateObserver();
void updateSubscriberObservers();
private:
TopicImpl(std::shared_ptr<PersistentInstance>, const std::string&, const Ice::Identity&, const SubscriberRecordSeq&);
IceStormElection::LogUpdate destroyInternal(const IceStormElection::LogUpdate&, bool);
void removeSubscribers(const Ice::IdentitySeq&);
//
// Immutable members.
//
const std::shared_ptr<Ice::ObjectPrx> _publisherReplicaProxy;
const std::shared_ptr<PersistentInstance> _instance;
const std::string _name; // The topic name
const Ice::Identity _id; // The topic identity
IceInternal::ObserverHelperT<IceStorm::Instrumentation::TopicObserver> _observer;
std::shared_ptr<Ice::ObjectPrx> _publisherPrx; // The actual publisher proxy.
std::shared_ptr<TopicLinkPrx> _linkPrx; // The link proxy.
std::shared_ptr<Ice::Object> _servant; // The topic implementation servant.
// Mutex protecting the subscribers.
mutable std::mutex _subscribersMutex;
//
// We keep a vector of subscribers since the optimized behaviour
// should be publishing events, not searching through the list of
// subscribers for a particular subscriber. I tested
// vector/list/map and although there was little difference vector
// was the fastest of the three.
//
std::vector<std::shared_ptr<Subscriber>> _subscribers;
bool _destroyed; // Has this Topic been destroyed?
LLUMap _lluMap;
SubscriberMap _subscriberMap;
};
} // End namespace IceStorm
#endif
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