Github user arpadboda commented on a diff in the pull request:
https://github.com/apache/nifi-minifi-cpp/pull/421#discussion_r227361035
--- Diff: libminifi/include/capi/api.h ---
@@ -79,6 +79,13 @@ processor *add_processor_with_linkage(flow *flow, const
char *processor_name);
processor *add_python_processor(flow *, void
(*ontrigger_callback)(processor_session *session));
+/**
+* Register your callback to received flow files that the flow failed to
process
+* The flow file is deleted after the callback is executed, make sure to
copy all the data you need!
+* The first callback should be registered before the flow is used. Can be
changed later during runtime.
+*/
--- End diff --
Not sure I understand the Q properly.
The current implementation only requires to add the callback before
finalising the flow (as there is no way to add the callback processor later).
Later the callback can be replaced.
---
