The product-processor:

The Product-processor is a micro-service that accepts a product in a raw form and processes it into a standard form.

A product is just a JSON object with an id and a list of attributes. Each attribute is composed of a name and a list of values (strings)

For example:

{
  "id": 1000,
  "attributes": [
    {
      "name": "title",
      "values": [
        "Red and blue T-shirt with a chicken print. XL"
      ]
    },
    {
      "name": "color",
      "values": [
        "red",
        "blue"
      ]
    },
    {
      "name": "size",
      "values": [
        "xl"
      ]
    }
  ]
}

The product-processor makes the following changes to the product input:

• Normalize all attribute values except title
• Remove illegal values
• Sort the attributes by the attribute name
• Persist the processed products and fetch processed products

Initial state

We start with the following :

• Spring-boot application (MAVEN based) with Guava dependency and an embedded MongoDB
• Rest controller (src/main/java/com/vicmar57/productprocessor/controller/ProductController.java)
• API definitions (part of the rest controller)
• Integration-tests that check the service

Tasks

Task 1 - Normalize all attribute values except title

We want to normalize the values of each attribute to a canonical form.

• The chosen canonical form is Capitalization. ** You can use an external library to do the capitalization if you want to.
• The title attribute should not be normalized (it is excluded).
• Add unit-tests to the Normalization logic

Example

• The value "red" becomes "Red"
• The value "Blue" stays "Blue"
• The value "extra large" becomes "Extra large"

Task 2 - Remove (filter) illegal values

Some attribute values are illegal and should be filtered out.

• The list of illegal values is given in the file src/main/resources/application.properties under: "attribute-values.exclusion-list" property.
• If all the values of an attribute are removed - remove the attribute as well.
• Add unit-tests to the filter logic

Examples

Assuming the values "N/a" and "As Seen" are filtered out.

• {"size": ["8"] , "color": ["N/a"] } -> { "size": ["8"] }
• {"size": ["8"] , "color": ["Blue","As Seen"] } -> { "size": ["8"], "color": ["Blue"] }

Task 3 - Sort the attributes by the attribute name

We want to sort the attributes by their names (alphabetical - case sensitive).

Example

• { "attachment":"wings" , "size": ["8"] , "Color": ["Blue"] } -> { "Color": ["Blue"] , "attachment":"wings" , "size": ["8"] }

Task 4 - Persist the processed products and fetch processed products

Provided is a product repository at src/main/java/com/vicmar57/productprocessor/repository/ProductRepository.java

You can autowire that interface and use it to persist and retrieve products.

• When the upsert product API is called, the product is processed and returned as before, but it is also persisted to the repository.
• Add a rest GET operation at "/product/{id}" that fetches processed products by their id.
• Make sure the integration test src/test/java/com/vicmar57/productprocessor/integration/GetProductTest.java works as expected.