https://github.com/talakb/aws-lambda-java-sdk-examples

AWS Lambda Java SDK examples for testing Lambda integration with other AWS services. Examples include synchronous (RequestResponse), asynchronous (Event), and stream processing approaches.
https://github.com/talakb/aws-lambda-java-sdk-examples

api-gateway aws aws-lambda lambda serverless

Last synced: 7 months ago
JSON representation

AWS Lambda Java SDK examples for testing Lambda integration with other AWS services. Examples include synchronous (RequestResponse), asynchronous (Event), and stream processing approaches.

• Host: GitHub
• URL: https://github.com/talakb/aws-lambda-java-sdk-examples
• Owner: talakb
• Created: 2022-04-25T15:27:25.000Z (almost 4 years ago)
• Default Branch: main
• Last Pushed: 2022-09-05T08:42:09.000Z (over 3 years ago)
• Last Synced: 2025-03-13T09:22:44.162Z (about 1 year ago)
• Topics: api-gateway, aws, aws-lambda, lambda, serverless
• Language: Java
• Homepage:
• Size: 62.5 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

README

          
# AWS Lambda Java SDK examples.

 

## 1 -   Synchronous (RequestResponse) Handler

 ### Serverless weather API

* A simple example with CRUD operation to accept request via API Gateway and interact with DynamoDB backend table. AWS services used:

  -  API Gateway

     - Lambda authorizer function is used to authentcate request using a token passed from API Gateway.

     - The authorizer function evaluates incoming toekn and returns allow or deny security policy back to API Gateway.

     - If 'allow' return policy is returned from the authorizer function, API Gateway forward the request to a lambda function based on the request resource and method.

  -  Lambda

  -  DynamoDB

  

![WeatherAPI-Serverless-Example drawio](https://user-images.githubusercontent.com/5312958/173243136-610cbb94-c816-4ac7-9306-fddd30c16fb1.png)

 ## 2 -   Asynchronous (Event) Handler

 

* Client will receive 202-Accepted response but not the actual response detail of a function logic. Once processing gets completed, response payload will be sent to a destination:

  - SNS topic

  - SQS queue

  - Lambda function

  - EventBridge event bus

  - Kinesis or DynamoDB stream

 

 * Destinations  needs to be configured in the Lambda function config. in AWS Console or using Lambda API.

  

 ### Send response to a queue (SQS and DLQ)

  

![aws-java-sdk-examples-ambda-GreetingAsync](https://user-images.githubusercontent.com/5312958/166472905-f97aaf7d-a08f-43b5-a26a-18eb6bcdf9ba.svg)

 ## 3 -   Stream Processing Handler (TODO)

 

 * The event trigger will be DynamoDB stream (events from CRUD operations on an item).

 * Lambda function logic receives the stream event from DynamoDB and executes additional logic. The response can be sent to a destination, if needed.