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Jini in the EnterpriseO'Reilly Conference on Java

Scott OaksSun Microsystems

(scott.oaks@sun.com)

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Agenda

Canonical Jini Jini Basics Using Jini in the enterprise

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Canonical Jini

Jini Network

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Another look

Print Service

Print Client

Print Service

Print Service

Service Network

Paycheck Svc

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Just anotherservice-based network

That adapts to service changes dynamically That can handle network failures gracefully That can substitute service implementations

transparently dynamically automatically

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Jini Basics

Jini provides A collection of services for

Lookup and discovery of servicesTransactionsData sourcingJini helper services

A set of APIs for distributed programming

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The Jini Lookup Service

Holds all service registrations on the (local) network

Actively manages those registrations Services place objects into the lookup service Clients download objects from the lookup service

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The Jini Lookup Service

JLS

Jini Network

Payroll Svc.

Payroll Client

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Lookup in the Enterprise

Default lookup is limited to a multicast radius 1.1 Discovery services can extend this to the

enterprise

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Lookup Integration

Any serializable object can be stored in the lookup service

Corba ObjectsRMI Remote ObjectsEJBs (of course...)Proprietary

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Jini APIs

Leasing APIs A login application A chargeback application ...

Remote Events A billing application A management application ...

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Java Spaces

The data source for distributed applications (enterprise and otherwise)

JavaSpace

Employee Manager Controller

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Why Jini in the Enterprise

Dynamic maintenance of services Supports any service Useful APIs Encourage good programming practices