shagbark / filtering

Project for implementing the idea of managing filters for entities

This application is an implementation of the idea of creating data filters.

This is a pet-project for implementing the idea of creating data filters using Redis. This is my first project in Kotlin using Redis.

The idea of creating filters

When I created API using filters in them, I was constantly discouraged with using POST requests for filtering data. After all, it's better to use GET request to receive and filter data. One day, I came across an answer on StackOverflow with a proposal of this idea.

The algorithm of filtering data in API:

1. Front application sends a POST request to create a filter (i.e. instead of sending GET request to receive data by the filter, it sends to create the filter)
2. Backend application saves JSON value of filter to the Redis (the redis key is the hash of JSON string(it's a simple Java hash, which was obtained by calling the java.lang.Object#hashCode() method))
3. After it, backend sends response with filled Location header and HTTP status 301.
4. Then, we can send the request to URL, which was indicated in Location header and we will get data, which was request in the first request.

Stack:

• Kotlin
• Spring Boot
• Spring Data
• Gradle
• Flyway
• Redis (and Spring Jedis library)

P.S. Since this is a pet-project, the main emphasis was placed on the implementation of the idea and its verification. Therefore, I did not add multiple checks for various variants of the transmitted data (in other words, I did not validate the input data).