Time/Place

This meeting is a hybrid teleconference and IRC chat. Anyone is welcome to join...here's the info:

• Time: 11:00am Eastern Daylight Time US (UTC-4)
• Dial-in Number: (712) 775-7035
  • Participant Code: 479307#
  • International numbers: Conference Call Information
  • Web Access: https://www.freeconferencecallhd.com/wp-content/themes/responsive/flashphone/flash-phone.php
• IRC:
  
  • Join the #fcrepo chat room via Freenode Web IRC (enter a unique nick)
  • Or point your IRC client to #fcrepo on irc.freenode.net

Attendees 

• A. Soroka
• Jared Whiklo 
• Unknown User (acoburn)
• Kevin S. Clarke
• Bethany Seeger
• Nick Ruest
• Yinlin Chen

Agenda

1. Discuss the current use and implementation of IdentifierConverters

2. Consider the use of Akka for aync operations
3. 4.5.1 Release Planning - when is code freeze?

4. Bugs are beginning to pile up 

5. Fedora Specification updates
   
   1. Messaging SPI
   2. Atomic Batch Operations - name? BatchOps? Bag-o'-Ops? OpSack? AtomicOp?
   3. CRUD
   4. Resource Versioning
   5. Binary Fixity Checking
   6. Authorization
6. ...

7. Status of "in-flight" tickets

Ticket Summaries

1. Please squash a bug!

2. Tickets resolved this week:

3. Tickets created this week:

Minutes

• IdentifierConverters:
  • The actual implementation, how we provide that service.
  • Now it is based on a Guava concept, and what we want is not exactly what it is providing. We should get rid of that and implement exactly what we want.
  • It will be a challenge because it is all throughout the code, and the longer it goes, the worse it gets
  • The recent move to Java8 (iterators to streams), provides a lot of opportunity to cleanup and make the code base smaller
  • What are the convertors? Just a mapping from one world to another world
  • Example: Reference to fedora objects (info:fedora/ then the path)
    • If you change the hostname, you don't need to change everything
  • How to implement? Have an interface that has two function; to, and from
  • Guava problem? Syntax vs Semantics -- it's not clear how the "sameness" gets represented
  • How to move forward? A. Soroka will pull together some basic contracts, http implementation, and API class.
  • Unknown User (acoburn) will open a ticket: 
  • It will be a large change!
• Akka:
  • What is it? JVM implementation of the actor model; Highly concurrent, possibly distributed operations
  • Other option is thread pools (sharing states and resources between threads is ugly)
  • It's a big step, programming model is different and unfamiliar
  • Where does it make sense? Things that are async, background jobs

    • fixity checking, modify an object (JMS events)

  • Before we really kick the tires on Akka, we should identify a couple other use cases
  • Should be easier to move forward on this than working on IdentifierConverters
• 4.5.1 Release planning
  • Do we want merged, and in 4.5.1
  • Squash and merge https://github.com/fcrepo4/fcrepo4/pull/1007
  • - A. Soroka will take care of this before March 25, 2016
  • When is code freeze? After we take care of the above; so March 25, 2016
• Feelings
• Specification updates
  • Please read them all, and provide feedback!
  • Messaging SPI
    • Specifying data that comes out but not the format
    • We should support all sorts of messaging protocols
    • We don't specify a serialization
    • We specify a serialization, or a mandatory serialization 
  • Use rdf - specify the semantics, not syntax
• fcrepo java client
  • Unknown User (acoburn) says it is ready, and should be released!
  • Nick Ruest and Unknown User (acoburn) will figure out how to release it next week
• Java8 Stream API
  • How to become more familiar with it?
    • There places in the code that need some refactoring, and could be a good place to get some experience
    • Unknown User (acoburn) can point out some good places
    • Unknown User (acoburn) and A. Soroka would be good resources to help
    • rbacl is a good place to start (all the for loops!)
    • fedora/modeshape impl (that could thrown into Akka too)