subscriptionstore.h
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#ifndef SUBSCRIPTIONSTORE_H
#define SUBSCRIPTIONSTORE_H
#include <unordered_map>
#include <forward_list>
#include <list>
#include <mutex>
#include <pthread.h>
#include "forward_declarations.h"
#include "client.h"
#include "utils.h"
class SubscriptionNode
{
std::string subtopic;
public:
SubscriptionNode(const std::string &subtopic);
SubscriptionNode(const SubscriptionNode &node) = delete;
SubscriptionNode(SubscriptionNode &&node) = delete;
std::forward_list<std::string> subscribers; // The idea is to store subscriptions by client id, to support persistent sessions.
std::unordered_map<std::string, std::unique_ptr<SubscriptionNode>> children;
};
class SubscriptionStore
{
std::unique_ptr<SubscriptionNode> root;
pthread_rwlock_t subscriptionsRwlock = PTHREAD_RWLOCK_INITIALIZER;
std::unordered_map<std::string, Client_p> clients_by_id;
const std::unordered_map<std::string, Client_p> &clients_by_id_const;
bool publishRecursively(std::list<std::string>::const_iterator cur_subtopic_it, std::list<std::string>::const_iterator end,
std::unique_ptr<SubscriptionNode> &next, const MqttPacket &packet) const;
public:
SubscriptionStore();
void addSubscription(Client_p &client, std::string &topic);
void removeClient(const Client_p &client);
void queuePacketAtSubscribers(std::string &topic, const MqttPacket &packet, const Client_p &sender);
};
#endif // SUBSCRIPTIONSTORE_H