This document provides a tutorial on AWS Lambda. It begins by defining AWS Lambda as a computing service that runs code without servers. It then lists key features like custom logic integration, fault tolerance, RDS proxy support, provisioned concurrency, and Step Functions workflow support. The document outlines the steps to create, upload, and invoke an AWS Lambda function using the Eclipse toolkit, including creating a project, uploading the code to AWS, and invoking the function to display output. It concludes by recommending AWS Lambda for executing application/function codes and providing an informative guide.

3. AWS Lambda Tutorial
AWS Lambda is a computing service that operates without any server for running the
codes. It manages the associated computing resources for better functionality. AWS
Lambda allows you to extend the functional integration to diverse AWS services by
implementing custom logic.
Hence, clarity is on AWS Lambda and its functionality, this is the AWS Lambda tutorial,
with all the important attributes, factors, features, and steps covered. Follow on with the
respective sections to educate yourself about AWS Lambda.

4. Features of AWS Lambda
● It allows you to implement custom logic onto the AWS resources or services such as S3 Buckets
or DynamoDB Tables.
● It consists of a fault tolerance feature that is embedded within AWS Lambda by default. It will
help protect your code against data center failures or machine failures.
● RDS Proxy by Amazon, Lambda can get the benefits of managed connection pools with respect
to relational databases. It efficiently manages concurrent database connections to relational
databases in a high count.
● Provisioned concurrency, the users will have an enhanced performance control of the Lambda
application or function.
● You can build workflows within AWS Step Functions for coordinating multiple Lambda functions
for certain long-running tasks.
● AWS Lambda bills you only for the functions that are executed and the requests that are served
successfully.

6. Creating, Uploading, and Invoking an AWS Lambda
Function Steps
1. Creation of a Project under AWS Lambda
The steps for creating an AWS Lambda project are as follows:
● Open the toolbar of the Eclipse toolkit and access the AWS menu to find the option
‘New AWS Lambda Java Project.’ Click on it!
● Now, add a name for your project; following that, give Group ID, class name, and
Artifact ID in the respective asked fields.
● Choose ‘Custom’ for the ‘Input Type’. But, get information about each of those
available types of input within AWS Lambda, such as Cognito Event, Kinesis Event,
SNS Event, S3 Event, and Custom.
● The custom input type is selected for allowing you to set up different event sources
such as mobile applications, user applications, AWS CLI invoke-command, AWS
management console, and others.
● Verify the entries and then click on ‘Finish.’

7. Cont……….
2. Uploading the Code under AWS Lambda
The next thing to consider is uploading the code onto AWS Lambda before it can be prepared for
invoking. This AWS Lambda tutorial will guide you with the necessary steps for uploading the same:
1. Choose ‘AWS Lambda’ within the Eclipse code window by right-clicking over it. Now, choose the
option of ‘Upload function to AWS Lambda.’
2. You will be then redirected to the page for selecting the Lambda Function, where you can choose
the specific region as per your convenience. The region you select should be the same as that of
the one you chose for the S3 bucket.
3. Now, create a new Lambda function and give it the desired name. Now, click on ‘Next.’
4. You will be redirected to the ‘Function Configuration’ page to enter the lambda function
description.
5. Now, you can choose the IAM role and S3 bucket that you want to use with your Lambda
function.
6. Now, select the ‘Publish new version’ option for creating or uploading a new Lambda function
version.
7. You can choose the available option for encrypting the code that was uploaded within the S3
bucket.
8. Now, click on ‘Finish’ to complete your upload process of lambda function onto AWS.

8. Cont…...
3. Invoking the Function Code under AWS Lambda
Here are the steps that you must adapt for invoking the Lambda function:
1. Choose ‘AWS Lambda’ over the code window of Eclipse by right-clicking over it and then
select ‘Run function on AWS Lambda.’
2. Pick the handle class that you wish to invoke.
3. Now, you have to enter a valid string in JSON format such as ‘AWS Lambda.’
4. The log box is then checked, and the output is displayed within the console.
5. Now, you can choose ‘Invoke’ to send the input data onto the Lambda function for
processing the code. If all the set-up aspects are right, then the return value will be
displayed over the Eclipse console.

9. Conclusion
This is an informative AWS Lambda tutorial that has tried to cover the major
guiding knowledge about the definition, features, and other associated steps
for carrying out perfect usability of AWS Lambda.
Planning on switching to AWS Lambda to execute your application or function
codes, then this tutorial might be the best knowledge guide for you.

10. THANKS!