[GitHub] daisy-ycguo commented on a change in pull request #273: add architecture docs

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daisy-ycguo commented on a change in pull request #273: add architecture docs
URL: https://github.com/apache/incubator-openwhisk-package-kafka/pull/273#discussion_r219368400
 
 

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 File path: docs/arch/README.md
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 @@ -0,0 +1,66 @@
+## MessageHub Trigger Provider Architecture
+
+### Create Trigger Feed
+![MessageHub Trigger Create](images/Arch-Provider-MHV1-Create.png)
+
+**Scenario:** User wants to create a trigger `trigger1` for MessageHub service instance `instance1`, using Credentials `Credential-1` and use rule `rule1` to invoke action `action1` with messages from topic `topic1`.
+
+1. Developer creates a MessageHub service `instance1`
+2. Developer creates topic `topic1` in MessageHub service `instance1`
+3. Developer creates Credential key `Credential-1` for MessageHub `instance1`
+4. Developer creates trigger `trigger1` on OpenWhisk, the trigger stores the annotation `feed` with the feedAction name from system package or binded package.(`/whisk.system/messagingWeb/messageHubFeed`).
+5. Developer invokes action feedAction to create trigger feed passing input parameters (lifeCycle:`CREATE`, trigger1, Credentials1, Options:`topic1`)
+6. The feedAction invokes feedWebAction forwarding input parameter.
+7. The feedWebAction inserts trigger feed doc into DB for worker group 0 (feedWebActions protects DB credentials)
 
 Review comment:
   use singular format: feedWebActions => feedWebAction

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