first commit

nodes/vp_meta_publisher.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <memory>
+#include <vector>
+#include <mutex>
+#include <iostream>
+
+#include "vp_meta_subscriber.h"
+
+namespace vp_nodes {
+    class vp_meta_publisher {
+    private:
+    protected:
+        // push meta to next nodes
+        virtual void push_meta(std::shared_ptr<vp_objects::vp_meta> meta);
+
+        // non-copyable for all child class
+        std::mutex subscribers_lock;
+        // next nodes as subscribers
+        std::vector<std::shared_ptr<vp_meta_subscriber>> subscribers;
+    public:
+        vp_meta_publisher(/* args */);
+        ~vp_meta_publisher();
+
+        // add next node
+        void add_subscriber(std::shared_ptr<vp_meta_subscriber> subscriber);
+        // remove next node
+        void remove_subscriber(std::shared_ptr<vp_meta_subscriber> subscriber);
+    };
+
+}
+