efsh/challenge-eventstore

Hiring challenge: implement the EventStore interface

Implement EventStore

In this challenge, you will create a class that implements the EventStore interface.

public interface EventStore {
    void insert(Event event);

    void removeAll(String type);

    EventIterator query(String type, long startTime, long endTime);
}

Your implementation should store events in memory, using any data structures you see fit for the task. The required behavior for the interface is described in the provided code javadocs, please see EventStore and EventIterator interfaces inside the src/main/java directory.

The implementation should be correct, fast, memory-efficient, and thread-safe. You may consider that insertions, deletions, queries, and iterations will happen frequently and concurrently. This will be a system hotspot. Optimize at will.

We expect you to:

• Write tests;
• Provide some evidence of thread-safety;
• Justify design choices, arguing about costs and benefits involved. You may write those as comments inline or, if you wish, provide a separate document summarizing those choices;
• Write all code and documentation in english.

You may use external libraries, but their use has to be properly justified as well.

This challenge is intentionally simple, we expect a simple, elegant, and polished solution. There is no unique solution to this challenge. The intent is to evaluate candidate's coding proficiency and familiarity with tools and best practices.

Solve this challenge

To solve this challenge, you may fork this repository, then send us a link with your implementation. Alternatively, if you do not want to have this repo on your profile (we totally get it), send us a git patch file with your changes.

If you are already in the hiring process, you may send it to whoever is your contact at Intelie. If you wish to apply for a job at Intelie, please send your solution to trabalhe@intelie.com.br.