subscriptionstore.h
1.97 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
#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"
#include "retainedmessage.h"
struct RetainedPayload
{
std::string payload;
char qos;
};
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;
pthread_rwlock_t retainedMessagesRwlock = PTHREAD_RWLOCK_INITIALIZER;
std::unordered_set<RetainedMessage> retainedMessages;
void publishNonRecursively(const MqttPacket &packet, const std::forward_list<std::string> &subscribers) const;
void 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, const std::string &topic);
void removeClient(const Client_p &client);
void queuePacketAtSubscribers(const std::string &topic, const MqttPacket &packet, const Client_p &sender);
void giveClientRetainedMessages(Client_p &client, const std::string &subscribe_topic);
void setRetainedMessage(const std::string &topic, const std::string &payload, char qos);
};
#endif // SUBSCRIPTIONSTORE_H