Web Server

Solutions:
- Apache (with mod WSGI)
- or nginx (with gunicorn I guess)
Goal/Function:
- Serves content
- handels HTTP requests etc.
- handels encryption
  - with SSL/TLS and Let's encrypt
- serves forms for user request and inputs
- has copy of Joblist to display those for the user according to requests etc.
- talks to the Manager service
- Users CANNOT talk directly with the manager
- has list of all currently running user sessions (maybe used for authentication)

Application Server

Solutions:
- Flask-Login (minimal)
- Flask-Session (maybe a bit more functions)
Goal/Function
- handels both internal and external users
Relational Database
- Solutions_
  - PostgreSQL
  - MariaDB
Object Relational Mapper
- Solutions:
  - Flask-SQLAlchemy

Part of the Application Server
manages also files on file server
Joblist
- Solution:
  - http://www.celeryproject.org/
  - Thread safe
  - Scheduling
  - Ressource management
REST API
- Solution
  - Flask internal
  - and also part of celery
- Goal/Function
  - Passes requests to the joblist/celery
  - Functions:
    - create_job
    - delete_job
    - get_job (JSON Object or metadata or both?)
    - alter_job
Mail notifications
- Solution:
  - Flask-Mail
- Goal/Function
  - Sends Mails to users if a OCR job has finished

Goal/Function
- celery checks joblists continiously
- job start commands will be passed to the containers
- jobs will be started accordingly

Solutions:
- Kubernetes
- swarm
Goal/Function
- How to handle job and resource management for user Jobs and processes.
- gets requests and tasks from the manager

Solutions:
- CEQUL with CWB Server
- Lucene
Functions/Goals
- KWIC
- KWIC with complex querys (POS, NER, Lemma querys)
- Frequency lists
- n-grams
- complex n-grams
- etc.