sakai - opensource consumer.oss-watch.ac.uk/events/2009-10-09/ib_slideware.pdf3rd party code 0 7.5...
TRANSCRIPT
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Sakai - OpenSource consumer.
How Sakai works with Open Source projects
Dr Ian BostonCTO, Caret, University of Cambridge
Sakai3 leadApache Shindig PPMC Member
Apache Sling PMC Member
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What is Sakai ?
CommunityDevelopersEducatorsResearchers
Higher EdProduction VLE/VREGlobal, 161 installations
Scalable, 100 - 200K users
Open SourceSakai Foundation (501c)ECL2 (Apache2 like)90% Java
50 - 60 core committers
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History
2004 2009
v1.0 v2.6v1.5 v2.0 v2.4
1.8m loc
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Libraries and IP
GovernanceLicense Clearance
Committer ClearanceCCLA
CLALibrary Selection
v2 Libraries
SpringHibernateApache CommonsApache Tomcat
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Lessons for V2
Code is not the only thing that matters
Someone else has probably written a better implementation already
Great CodeBad Community
Bad CodeGreat Community
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Sakai 3
Only own what we have to
Write less, keep it simple
Select on community, license then code
Engage, contribute, influence
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OpenSocialCampfire Announcement 11/2007
1,000s of DevelopersApp PortabilityFantastic UX
800M users315M app installs
1st Birthday 05/2009
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Sakai Early 2008
Achademic Social Networking
Institutional Technical
Federation/Integration
Gen Y/Z
Web NGUX Driven
App Community
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Apache ShindigOpenSocial RI Incubator
Code donated to the IncubatorGrowing Community
Mainly Google
In production
No ContainerUnclear SPI
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Engage
Read and UnderstandAsk questions, listenPatch, bug fix
Trust Read and UnderstandAsk questions, listen
Patch, bug fix
Commit to taking eternal responsibility for every line of code you commit.
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Community Frustrations
“The code is ugly an broken, I wouldn't do it like that”
“It doesn't address my use cases”
“My patches keep breaking and they won’t take them.”
explain, educate, help, support, joke, show humility, no
arrogance, present evidence
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Committer Pain
“I don’t have time to read 10 paragraphs and try and work out what is being said”
“I have a life, I volunteered”
“Not that question yet again”
“I cant take responsibility for THAT! (WTF)”
explain, educate, help, support, joke, show humility, no
arrogance, present evidence
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Apache Invitation
• Trust builds, volume of patches, contributions
• Private PMC Vote or PPMC + IPMC
• Invite, Accept
• Legals
• Commit access
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What then.
• Commit what you like - No
• Nothing changes except your name appears on “svn blame” - Yes
• When the build breaks at the weekend... you feel like you should fix it - Yes
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Apache SlingEnterprise Content Management
Web app framework
The name "Sling" has been proposed by Roy Fielding who explained it like this:
[The name is] Biblical in nature. The story of David: the weapon he uses to slay the giant Goliath is a sling. Hence, our David's [David Nuescheler, CTO of Day Software] favorite weapon.
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Educational Content Management
50% Enterprise Content Management Use Cases50% Educational Use Cases
everyone is an editorgroups
educational apps integration
Sakai 3
50% Sling50% Sakai
UI/UX
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Code base
0
500,000
1,000,000
1,500,000
2,000,000
Sakai 2.6 K1 K2
Sakai Code3rd Party Code
0
7.5
15.0
22.5
30.0
2.6 K1 K2
Build Time (min)
0
125
250
375
500
2.6 K1 K2
Modules
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Code Coverage
0
22.5
45.0
67.5
90.0
Sakai 2.6 K1 K2 Apache Code
Unit Test CoverageAutomated Test CoverageManual Test
?
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Resource Usage
0
500
1,000
1,500
2,000
Sakai 2.6 Sakai3
Minimum Requirements
Perm Space StartupWorking Cache
0
500
1,000
1,500
2,000
Sakai 2.6 Sakai3
2G Limit
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Architecture
logging
Http
config
authn authz JPA
locking cache
personal public presence
resource
event
messaging searchfriends
JR-API
json mime
cron engine httpauth
openid formauth
JR-access JR-user webdav
servlets resolver scripting
Ruby Python
ESPJR-Client Scala
Shindig
Apache Jackrabbit
OSGi/ Apache Felix
JMS
SMS
XMPP
IMAP
POP3
VersionManager
PersistenceManager
IMS CC ICOM Rules Workflow
IMS LIS
LDAP
HTTP REST + JSON
Caldav