Johan%20J.%20Lukkien,[e-mail]

1
OOTI Talks

• 30-11-2005

2
To the presenters

• Opinion?
• Comfortable?
• Achieved what you wanted?

3
Questions

• DCOM limitation to windows essential? Where does
  it come from?
• Distributed objects from the title?
• When is it usefui, for us?
• Why is CORBA not very popular?
• what is needed for some RMI system to get
  popular?
• DCOM where is it used? Suppose I need it, is it
  simple?
• Which class of problems is solved?
• What is the DCE meaning in the DCOM?
• GLOBE which performance measures are decreased?

4
Advice

• presentation goals?
• If you cant define something, seek for
• defining properties
• goals (what is it for)
• Make a diagram with all the files included, make
  a diagram of the running system, explain the
  tasks you must do step by step
• note the extra time in the presentation is
  easily countered by not having confusion
• UML interaction diagrams are an effective way to
  explain interactions
• Can refer to book DCOM/CORBA is instance of an
  RMI-based system .... refer then to a sample
  diagram and map concepts, e.g. binding,
  invocation
• Effective use of time?
• Involve your adience

5
Comment

• If was clear what the CORBA system was however,
  the relation between some (smaller) elements like
  IOR and a corresponding problem was unclear
• A significant number of concepts were not
  explained in advance concepts have a reason
• name space, naming etc.
• Could have explained everything around a single
  example

6
Questions

• What is the goal of the presentation? What are
  you going to learn us?
• What is a DHT?
• What would be the alternative to flooding?
• breadth-first search, depth-first search

7
Advice

• Take a goal (e.g. distributed object store) and
  explain the workings
• System picture, relation with underlying Internet
• Explain concepts/issues in this domain
• overlay topology (representation, establishment),
  free riding, incentive to share, multi-source
  file transfer, search, addressing, location
  hiding, naming .....

8
Comments

• After a P2P afternoon
• do we understand enough now to see what the
• applications
• problems
• solutions
• are?