rfnoc: Use RTTI "serialization" for stream commands

A small modification to rfnoc::action_info makes it polymorphic, and
instead of serializing data structures into a string, this allows
creating custom action objects and identifying them via RTTI. The stream
command action object is a good example for how to use this, so all the
usages of stream command action objects were converted to this scheme.

1 files changed, 24 insertions, 0 deletions

diff --git a/host/lib/rfnoc/actions.cpp b/host/lib/rfnoc/actions.cpp
index 1f5f0f2f7..428a1fcb2 100644
--- a/host/lib/rfnoc/actions.cpp
+++ b/host/lib/rfnoc/actions.cpp
@@ -19,3 +19,27 @@ action_info::action_info(const std::string& key_) : id(action_counter++), key(ke
     // nop
 }
 
+//! Factory function
+action_info::sptr action_info::make(const std::string& key)
+{
+    if (key == ACTION_KEY_STREAM_CMD) {
+        return stream_cmd_action_info::make(
+            uhd::stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS);
+    }
+    //return std::make_shared<action_info>(key);
+    return sptr(new action_info(key));
+}
+
+stream_cmd_action_info::stream_cmd_action_info(
+    const uhd::stream_cmd_t::stream_mode_t stream_mode)
+    : action_info(ACTION_KEY_STREAM_CMD), stream_cmd(stream_mode)
+{
+    // nop
+}
+
+stream_cmd_action_info::sptr stream_cmd_action_info::make(
+    const uhd::stream_cmd_t::stream_mode_t stream_mode)
+{
+    //return std::make_shared<action_info>(ACTION_KEY_STREAM_CMD);
+    return sptr(new stream_cmd_action_info(stream_mode));
+}