Significantly reworked the monitoring infrastructure with a more granular per socket API and to play well with monitoring endpoints in application threads

src/stream_engine.hpp

@@ -31,6 +31,7 @@
 #include "i_encoder.hpp"
 #include "i_decoder.hpp"
 #include "options.hpp"
+#include "socket_base.hpp"
 #include "../include/zmq.h"
 
 namespace zmq
@@ -133,6 +134,9 @@ namespace zmq
 
         bool plugged;
 
+        // Socket
+        zmq::socket_base_t *socket;
+
         stream_engine_t (const stream_engine_t&);
         const stream_engine_t &operator = (const stream_engine_t&);
     };