2. Could Jiro™ Extend the Jini™ Pattern Lanuguage?
Anthony Earl, Ph.D.
Jiro Consultant
Sun Microsystems Inc. (SMI)
For the OOPSLA workshop on the Jini Pattern Language in Minneapolis, 15th October 2000
scheduled for technical 15 minutes + 5 for questions

3. Overview What is Jiro for? Jiro pieces in Common with Jini
Where Jiro extends Jini (I)
Example Station Sequence
Where Jiro extends Jini (II)
Jiro References
Questions

4. What is Jiro for?
Jiro is SMI's implementation of the Federated Management Architecture (FMA)
The FMA was developed as part of the Java™ Community Process (JCP) to describe interfaces for building software components to manage heterogeneous storage networks.
Jiro is to Storage Management architectures what Enterprise Java Beans are to web-based business architectures.

5. Jiro pieces in Common with Jini
The Jiro implementation takes advantage of Jini by using some of its interfaces and implementation code (not a requirement of the FMA).
These parts of Jiro are parts of Jini:
Leasing
Lookup Service
Transaction Service
Valid in Jiro ==> valid in Jini

6. Where Jiro extends Jini (I)
Stations include:
Acceptor-Referent pattern(?) supports:
Remote static invocation
Remote constructors
Context mechanism for security, transactions, controllers and logical threads
Remote deployment of services
Get the jar files into the right locations with the right RMI-codebase property set.

7. Example Acceptor-Referent Sequence (I)
GOAL: Instantiate a remote Jiro-aware object.
1/ Client instantiates a Proxy using any one of the available constructors. The last argument of the constructor is the station address of the station that is to host the referent object.
2/ The Proxy class will need to lookup an appropriate Station Proxy by querying a lookup service with the station address supplied.

8. Example Acceptor-Referent Sequence (II)
3/The Proxy extracts context information to be passed explicitly to the Station Proxy.
4/ The Proxy class passes the operation request to the Station Proxy
5/ The Station Proxy forwards the request to the Station
6/ The Station uses the explicitly passed context information to establish a context
7/ The Station locally instantiates the Referent object

9. Example Acceptor-Referent Sequence (III)
8/ The Station must now create an Acceptor for the new Referent object
9/ The newly created Acceptor is returned to the Proxy as an Acceptor embedded in a binding information object
10/ The Proxy then binds the returned Acceptor. All remote method invocations on the Proxy will now be forwarded through the Acceptor to the Referent Object

10. Where Jiro extends Jini (II)
Extended Services
Event Service
Instead of 1-n source-listeners there is n-1-n sources- service-observers/responsibles
New Services
Logging of messages
Scheduling of events
Persistence of services
Security (based on JAAS) of method calls
Controllers and Logical Threads

11. Jiro References http://jiro.com is the place for Jiro resources.
There are no published Jiro books (such work is in progress).

12. Jiro™ Technology Questions
Please Welcome. From Sun Microsystems.
Director of Market Development. Mr Mike Bohlig