Seesaw

---

Problem

The 52N WPS currenty requires a client to constantly pull the status of a process. It would be nice if the user could be notified about the state of a process, most importantly when it is finished.

However, that is neither the task of the service, nor of the client (e.g. Wps-js).

Solution

A third component, the seasaw, can be tasked to pull information from a resource at a defined interval, and if the response matches a certain pattern. The seasaw should be an independent resources from the WPS so that we only need one instance that can support many WPS.

User stories

1. As a user I want to receive an Email with a link to the result of a WPS process once that it is finished so that I don't have to check myself all the time if it is done.
2. As a user I want to be able to login to the Wobbler and see a list of all tasks that were submitted using my public identifier.
3. As a user I want to see a list of all public tasks, i.e. all tasks that are not connected to a specific user.
4. As a user I want to schedule a WPS process (having important side effects) to run at a defined interval and to be notified of the output so that I don't have to do the scheduling manually.
5. As a user I want to schedule a WPS process to run once at a specified time so that I don't have to send the process at that time myself.
6. As a user [..]

Features

• Response matching
  • via regex
  • via XPath
  • via "strings contained"
• Actions for matched responses
  • Send Email
  • use WNS
  • execute JS code (running in sandbox, Email API provided)
  • Templates
• Specific actions for exceptional responses
• OAuth Login for backend (and eventually frontend)
• Persistent storage
• RESTful API
  • POST a new task
  • DELETE a task
  • GET a task - get the status

Architecture

• MEAN stack - http://mean.io/#!/ and http://www.ibm.com/developerworks/library/wa-nodejs-polling-app/ and https://www.youtube.com/watch?v=1Sy3vWJ1N2U
• node.js
  • https://www.youtube.com/watch?v=M-sc73Y-zQA
  • https://www.youtube.com/watch?v=ndKRjmA6WNA
  • Styling with less
  • Testing with mocha
  • underscore.js
  • XML: https://nodejsmodules.org/tags/xml
    • use JSONIX > https://github.com/highsource/jsonix
  • http://metamarkets.com/2012/node-js-for-the-enterprise/
  • storage
  • • Sequelize - http://www.ziggytech.net/technology/web-development/experiences-with-node-js-porting-a-restful-service-written-in-java/
    • SQLite - http://blog.modulus.io/nodejs-and-sqlite
    • MongoDB - ...
• backend UI for all currently listed tasks (only with login, and only for admin), based on Angular
• frontend UI with information on the project, based on Angular
• ...

The Name

The service brings push and pull together, one thing happens and another thing is triggered, going up and down.