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| Name | Current message text |
|---|---|
| h English (en) | * Is a list of services waiting for a response within a single process * A new entry is added to the requestServices list manually by main logic when a service will be wanting a response, some intermediary Lambda's may not need to be added to the list * Functions as a LIFO list * Best type would be an array where we can use push/pop methods, not sure correlation ids middleware can handle this, might need to stringify then parse array * A service can add a different service's Lambda to the list, eg one service might add a different service to receive the response * A service could add multiple entries to the list * When a message is added to a topic, middleware checks to see if there are any entries in the requestServices correlation id, if there are it adds a ''requestService'' message attribute to the message, this can be filtered by subsciptions so only that service receives the message * Only when adding to an Out queue, because if a Lambda adds eg to an In queue it is not considered an activity that is passing a result back to another service. * We could have a special wrapper function for adding messages to a services Out queue that does this, rather than coding it into the SNS service request code * When the Out message adds the requestService to message attributes, also pop it off the requestServices correlation id that gets passed on * Maybe can remove from Dynamo __context__ field, but if we ever use Dynamo Streams will probably want to keep it |