https://github.com/chouffe/sourcegraph

Coding challenge Source Graph
https://github.com/chouffe/sourcegraph

Last synced: over 1 year ago
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Coding challenge Source Graph

• Host: GitHub
• URL: https://github.com/chouffe/sourcegraph
• Owner: Chouffe
• Created: 2016-03-19T17:44:58.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2016-03-19T17:48:10.000Z (over 10 years ago)
• Last Synced: 2025-01-20T22:22:50.958Z (over 1 year ago)
• Language: Clojure
• Size: 3.91 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# webserver

SourceGraph Challenge.

## Endpoints

The main rationale for using a hashmap from names to urls was to be able to have fast lookups on names. A hashmap is an optimal DataStructure forl (O(1) time) lookups (given the load factor is not too high < 75%).

- GET /names/:name

    - Lookup in a hashmap

        - O(1) time

        - O(n) space (to store the hashmap), where n is the number of names stored so far

- PUT /names/:name

    - Add an entry into the hashmap

        - O(1) time

        - O(n) space (to store the hashmap)

- DELETE /names

    - Deletes the hashmap and creates a fresh new empty one

        - O(1) time

        - O(1) space

- POST /annotate

    - Space: hashmap is stored O(n) + parsed html O(number of html tags)

    - Time: parsing O(number of html tags) + data lookup O(words in html)

    - Parses the html string into a tree structure (dom).

        - time: O(number of html tags)

        - space: O(number of html tags)

    - Performs a tree traversal O(number of html tags)

        - On each textual node (but the children of an  tag) performs a lookup (O(1) time) on each word to see if it is in the hashmap, and if it is wraps it with the associated url

            - time: O(number of words in the html)

            - space: O(n) hashmap


## Prerequisites

You will need [Leiningen][] 2.0.0 or above installed.

[leiningen]: https://github.com/technomancy/leiningen

## Running

To start a web server for the application, run:

> lein repl

Leiningen will fetch the dependencies and install them in the project directory. It can take some time :)

When the clojure repl is started, run:

> (-main)

That will start a web server on port 3001.

## License

Copyright © 2016 Arthur Caillau