Scrumbox ece2011.pptx

© 2002 IBM Corporation

Confidential | Date | Other Information, if necessary November 7, 2011 Copyright © 2011 compeople AG, Made available under the Eclipse Public License v 1.0

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Christian Campo EclipseCon Europe 2011

Scrum on steroids - Building the "perfect" Scrum app with Eclipse technology

Copyright © 2011 compeople AG, Made available under the Eclipse Public License v 1.0

Scrum on steroids -‐ Overview

•  What is Scrumbox ?

•  MoIvaIon

•  Architecture •  ImplementaIon

•  Demo

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Scrumbox

•  Scrum planning tool

•  created by compeople for our own planning

•  based on Eclipse frameworks (as you will see)

•  currently internal code but we are planning on open sourcing it •  more later.....

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MoIvaIon (Riena perspecIve)

•  We had mulIple sample apps for Riena before

•  Not maintained aRer iniIal creaIon

•  Just playgrounds •  miss-‐used to reproduce bug reports (became preTy unusable as showcase)

•  an alternaIve demo we created was ok but preTy trivial

•  demo didnt progress much aRer iniIal creaIon

•  customer and community problems used more complex usecases than we did in our demos

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MoIvaIon (Scrum perspecIve)

•  We tested and used a number of alternaIves

•  Excel •  some tools with PHP apps

•  PHP .... seriously ? •  with bugs •  0.3 commiTer working on it (some with no update in the last 6 month or

more)

•  the way they used Scrum, Userstories, Tasks did not really fit

•  no integraIon with any bugtracker •  we finally wanted a tool that WORKED (or if not we could fix it ourselves)

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MoIvaIon (compeople perspecIve)

•  Have an interesIng project that supplies ideas for students, bachelors etc.

•  A project to train new employees with OSGi and Riena etc.

•  Get a beTer understanding how we could use other Eclipse frameworks in our projects

•  Test and beTer understand how people use Riena •  A project that interesIng to many people, and find interest if we open source it

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Scrum is...

•  Teams

•  Users (Developers) •  Sprints •  Userstories •  Tasks

•  imports Bugs into Userstories

•  Burndown charts •  Workload charts

•  metrics per developer

•  availability per developer

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Analyse the Domain

•  Why did the last scrum planning tool not work for you ?

•  Are their other (beTer tools) out there ? •  Excel, MicrosoR Project ?

•  A reoccuring design problem was detected in most tools

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Products Sprints Userstories Tasks

Products Sprints Userstories Tasks

most scrum planning tools scrumbox


Talk to the People

•  Talk to the various user groups and have them describe their top usecases

•  developers •  project leads •  scrum master

•  head of department

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Talk to the People II

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•  developer •  see open tasks •  track times

•  project leads •  look at bugtracker •  create userstories •  plan tasks •  look at burndown and workload •  check progress in sprint

•  scrummaster •  overview of planned tasks in a sprint •  compare actual against planned burndown •  sprint result presentation

•  head of department •  hours worked per developer •  time spent on user stories •  time spent on products

•  wishes •  calculate availability (hours available per developer/project) •  print timesheet per month (per project) for everyone


Eclipse Frameworks to use

•  Equinox, RCP •  Riena •  EclipseLink (MySQL)

•  Nebula (CompositeTable, Grid, NatTable)

•  p2 (sIll to come)

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Client / Server approach I

•  Riena has the client / server approach built-‐in •  most other Eclipse frameworks assume everything is in one JVM (in one Ier)

•  EclipseLink and persistence layer only on server •  no dependency on persistence packages on client

•  server stateless •  client pulls current state from server whenever a view is acEvated

•  no local storage of data, refresh every Ime a view becomes acIve

•  always use Jobs/UIProcess to refresh/load data from server

•  Security is no issue, same access rights for everybody (has a login process)

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Scrumbox Server

Architecture I

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MySQL

EclipseLink Riena

Equinox

Entities DTOs

Services

Scrumbox Client

Riena

Equinox

DTOs

Views/Controllers/Logic Remote Calls over HTTPS

RCP Nebula ...

local Services


Persistence -‐ EclipseLink

•  use DTOs between client and server •  load defined set of data before it is serialized to client •  copy data between DTOs and EnIty models with generic uIlity

•  remove internal EclipseLink objects from EnIIes before you copy them to DTOs (i.e. IndirectLists)

•  opEmisEc locking

•  guaranteed integrity

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Persistence – EclipseLink II

•  PersistenceUnit -‐> EnEtyManagerFactory -‐> EnEtyManager (EM) which is a context for enIIes.

•  Client -‐> EclipseLink -‐> DB (1 EM* per Client) (standard scenario)

•  Client -‐> Server -‐> EclipseLink -‐> DB (?? EMs) (Scrumbox/Riena) •  started with 1 permanent EM per Server

•  login to DB with generic userid (not user specific) •  created random errors (racecondiIons)

•  -‐> EM instances are NOT threadsafe •  EclipseLink Team helped and now we pool EMs

•  if you think of EnItyManager as “connecIon” then it becomes more obvious...

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Architecture II

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MySQL

Scrumbox Server

EclipseLink Riena

Equinox

Entities DTOs

Services


Map Domain to Riena NavigaIon Model

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Statusmeter SWT Widget

•  Did you see the statusmeter ?

•  We needed a bar to visualize the progress of a task

•  support different colors •  that can be displayed as widget or in a table

•  Didnt exist in SWT or Nebula

•  So we created a new widget and contributed the code to Riena. •  SIll a limitaIon in SWT Table only allows it to be displayed in the first column *grrrrr*

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Note: You can put an image into another column but then SWT Table inserts a blank ident


Tables I

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SWT table implementaIons

•  We were also looking for the "perfect" SWT Table implementaIons :-‐)

•  Requirements for table implementaIon

•  Tables where the number of columns could dynamically change

•  Tables that could display the statusmeter (in any column)

•  Table that supports checkboxes or text fields in cells •  Varying height of row

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Tables II

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•  SWT Table •  default + platform look and feel •  problem if image is not in the first column •  you cannot add widgets into cells or multiple widgets (maybe CellEditors) •  same height for all rows

•  CompositeTable •  header in platform look •  repaint issues •  does not show selection in row •  can have widgets in cells

•  NatTable •  complex API (different concept) •  no support for JFace

•  Grid •  no platform look •  shows selections •  varying row height •  widgets in cells •  can configure Renderers

•  Grid •  no platform look •  shows selections •  varying row height •  widgets in cells •  can configure Renderers


Mylyn

•  used as universal API for retrieving bug informaIon

•  rather than wriIng accessors for Bugzilla, ManIs etc. Scrumbox

•  we programmed against Mylyn code which in turn than access the bugreporIng content

•  uses some internal API of Mylyn but works

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New Technologies -‐ Testbed

•  We made our first steps using Git with the Scrumbox codebase.

•  Started using Tycho and Maven with Scrumbox

•  for all three plalorms (Windows, Mac, Linux)

•  building client and server •  We did extensive Performance, Memoryleak analysis based on the Scrumbox client for code in Riena.

•  found a few problems when redeploying .WAR archives in running JVMs

•  found problems that only occurred when client is running for a longer Ime

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Copyright © 2011 compeople AG, Made available under the Eclipse Public License v 1.0 24

Demo


Conclusion •  Scrumbox achieved our main goals

•  making Riena a beTer framework

•  idenIfy pain points in Riena •  have a scrum planing tool

•  create an environment for people to learn about Riena and Eclipse technology

•  Lessons learned: Eat your own dog food •  Find out how easy it is to use your API •  Find problems, bugs, race condiIons

•  Have a product to test your weekly builds against (internally) •  We spent a lot of Ime figuring out how some Eclipse frameworks would best work in a client / server environment.

•  Plan to open source in the near future

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Q&A

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•  http://www.eclipse.org/riena •  http://wiki.eclipse.org/Riena

Copyright © 2011 compeople AG, Made available under the Eclipse Public License v 1.0 27

Scrumbox ece2011.pptx

Technology