AWS Lambda
AWS Lambda is a serverless computing service provided by Amazon to reduce the configuration of servers, OS.
It lets you run code without provisioning or managing servers - scales automatically and only charges for the time your code is running.
Overview
- Zero server management
- Flexible scaling
- No payment for idle time - Pricing is pay for what you use.
Feat
- AWS Lambda uses json (Javascript object notation) to pass data to and from lambda functions.
- We can control the resources(cpu clock, etc) a lambda function on aws can use by assigning it more or less memory. There is no other way to control the amount of resources a lambda function uses.
- The input classes in a Lambda function should be Serializable:-
- e.g. in the code shown, ‘Integer’ is the input class and should be Serializable.
Generate FAT jar
Run 'mvn clean package' to generate the FAT jar file
Terminal > mvn clean package
Create a Serverless function on AWS
Run 'mvn clean package' to generate the FAT jar file
Terminal > mvn clean package
Upload the fat jar file
Terminal > mvn clean package
Configuration
EmployeeFindByIdHandler.java
BookAddLambdaHandler.java
BookAllLambdaHandler.java
Note
The handler is specified in the following format:-
package.className::methodName
e.g. com.ankur.lambda.book.BookAllLambda::handleReqeust
Create a REST API trigger with API Gateway
