Rename i_inout to i_engine_sink

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>

1 files changed, 22 insertions, 1 deletions

diff --git a/src/i_engine.hpp b/src/i_engine.hpp
index 7bd4ea6..636985f 100644
--- a/src/i_engine.hpp
+++ b/src/i_engine.hpp
@@ -24,13 +24,15 @@
 namespace zmq
 {
 
+    //  Abstract interface to be implemented by various engines.
+
     struct i_engine
     {
         virtual ~i_engine () {}
 
         //  Plug the engine to the session.
         virtual void plug (class io_thread_t *io_thread_,
-            struct i_inout *inout_) = 0;
+            struct i_engine_sink *sink_) = 0;
 
         //  Unplug the engine from the session.
         virtual void unplug () = 0;
@@ -48,6 +50,25 @@ namespace zmq
         virtual void activate_out () = 0;
     };
 
+    //  Abstract interface to be implemented by engine sinks such as sessions.
+
+    struct i_engine_sink
+    {
+        virtual ~i_engine_sink () {}
+
+        //  Engine asks for a message to send to the network.
+        virtual bool read (class msg_t *msg_) = 0;
+
+        //  Engine received message from the network and sends it further on.
+        virtual bool write (class msg_t *msg_) = 0;
+
+        //  Flush all the previously written messages.
+        virtual void flush () = 0;
+
+        //  Engine is dead. Drop all the references to it.
+        virtual void detach () = 0;
+    };
+
 }
 
 #endif