Merge pull request #10 from edly-io/danial/add-adr-for-transformers-architecture

Add ADR for transformer architecture

Author: feanil

docs/decisions/0004-transformers-architecture.md

@@ -0,0 +1,34 @@
+4. Transformers Architecture
+============================
+
+Status
+------
+
+Approved
+
+Context
+-------
+
+We can develop event transformers either using the “Backend” architecture
+or “Processor” architecture. Making the transformers “backends” will result
+in relatively more nesting in the configurations as this “backend” will have
+its own configurations.
+
+If we decide to develop the event transformers as “processors”, it will result
+in less complexity in the code since the transformer can be easily appended in
+any backend’s (router or logger) processors’ pipeline.
+
+
+Decision
+--------
+
+Transformers will be developed as event processors that can be added in
+any backend’s pipeline. Then the transformed events can be used for any purpose,
+either for simply logging using the LoggerBackend or to route events using
+EventRoutingBackend.
+
+Consequences
+------------
+
+Developing transformers as processors will result in relatively less complex
+configurations and it would provide us wider range of use cases for the transformers.