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Reusable Lambda for Multiple Event Types (Java)

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I want to write an AWS Lambda function that is able to respond to various types of event types: API Gateway, Kinesis, S3, etc. The API/SDK I need to work with is Java. I'd like to create a general-purpose handler, but it appears that each service has its own event type and does not derive from some common parent event type. Is there a pattern or a best practice for creating an AWS Lambda function that can be used with a variety of event types? Or do I need to create a custom handler for each event type?

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Brian
demandé il y a un an1820 vues
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Hi Brian,

One approach is to try to find a common “parent” to all those event types. As everything is an object in Java, you could argue that your handler could accept Object type as the event.

The drawback is that then you ll have to cast and use instanceof operator, not ideal but it will work.

Another approach is to use Map and/or Inputstream as shown here: https://docs.aws.amazon.com/lambda/latest/dg/java-handler.html.

Hope it helps

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Antonio_Lagrotteria
répondu il y a un an
  • Brian
    il y a un an

    Using Object and instanceof does work, but isn’t really a lot different than having a handler per event type. The issue with the Map or InputStream is that the event is serialized and I have essentially the same problem as before in that each event has a different format. :(

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