SwissRE Challenge

Task: develop a task manager.

This was done using the Clojure programming language.

Installation

Ensure you have the latest version of the Java Development Kit installed.
Install Leiningen.

Usage

Currently, this task only contains unit tests, which can be run as follows:

lein test

Examples

The core of the project is the task-manager package, which defines a couple of functions as a contract for the requirements of the challenge. Namely:

task-manager.utils includes constants and utility functions for this project.
- In particular, the total number of tasks total-tasks is defined as a constant here.
The task-manager.model namespace defines the data structures for manipulation:
- tasks are defined as a hash map with the following fields:
  - pid: an UUID to identify the current task
  - priority: can be picked as either :low, :medium, or :high. Internally, it will be assigned to a number using the utils/get-priority function. The smaller this number, the higher the priority.
  - creation-time: timestamp of task creation
  - command: a string with the desired command to run
- the task-manager itself, which is currently being treated as a list
The task-manager.add-task namespace defines functions to add tasks to the task manager using the following algorithms:
- default-add only adds a task if there is room in the task manager
- fifo-add clears space for new tasks by deleting the oldest ones
- priority-add only adds tasks give they have enough priority when compared to the existing ones.
The task-manager.list-task namespace lists tasks using the required strategies: by-creation-time, by-priority, and by-pid.
The task-manager.kill-task namespace includes functions to remove tasks from the task manager, namely by-pid, by-priority, or kill all tasks.
- As a known behavior, since tasks do not execute their commands, this only means removing tasks from the task-manager list.

Known Bugs and Quirks

Java interoperation is not yet properly implemented.
The task manager doesn't start real system tasks.
Compiling the application with lein uberjar will generate a simple Hello World!.

License

This program and the accompanying materials are made available under the terms of the Eclipse Public License 2.0 which is available at http://www.eclipse.org/legal/epl-2.0.

This Source Code may also be made available under the following Secondary Licenses when the conditions for such availability set forth in the Eclipse Public License, v. 2.0 are satisfied: GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version, with the GNU Classpath Exception which is available at https://www.gnu.org/software/classpath/license.html.

ishiikurisu / SwissREChallenge