This API allows the client to:

• Create customers in one single request
• Update a single customer
• Delete a single customer
• Retrieve a customer
• List all customers

The API allows the client to do a conditional GET by providing the If-Modified-Since HTTP header.

e.g.

GET /api/customers/1 HTTP/1.1
Host: localhost:8081
Content-Type: application/json
If-Modified-Since: Sun, 29 Apr 3011 18:22:20 GMT

The server will use it to see if the given customer has changed since the provided time. The date is returned only if changes are found.

This feature is useful for mobile apps as it saves bandwidth by returning no body content when there are no changes.

For clients who need to synchronise the customers periodically, they can add the lastModified query parameter to the GET end point to get the incremental changes.

e.g.

GET /api/customers?lastModified=Sat, 28 Apr 2018 16:58:35 GMT

This parameter will be used by the server to check if there are any changes after the specified time, including:

• New customers stored
• Any updates to existing customers
• Any deletion to existing customers(the deleted field will be true)

Due to the time restrains, there are quite a few things that need to be improved/implemented at a later stage

• Duplication check
• Request validation, e.g. returns 400 when the payload is malformatted
• PATCH operation that allows patial update
• More search parameters
• More test coverage

Application Coverage:

Resource Coverage:

Database is required to get the APIs running

Make sure you update the database configuration in the Global Mule Configuration Elements

If you are using MySQL, run the following script to create the customer table

CREATE SCHEMA `customer_schema` ;


CREATE TABLE `customer_schema`.`customer` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `first_name` VARCHAR(45) NULL,
  `last_name` VARCHAR(45) NULL,
  `address` VARCHAR(45) NULL,
  `last_modified` TIMESTAMP NULL,
  `deleted` VARCHAR(5) NULL DEFAULT 'false'
  PRIMARY KEY (`id`));