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Jini Architecture

Jini Architecture. Alessandro Brawerman. Contents. Jini definition Advantages Architecture How it works Websites to check. What is Jini?. Distributed system - federating groups of users and the resources required by those users.

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Jini Architecture

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  1. Jini Architecture Alessandro Brawerman

  2. Contents • Jini definition • Advantages • Architecture • How it works • Websites to check

  3. What is Jini? • Distributed system - federating groups of users and the resources required by those users. • Enables users to share services and resources over a network. • Services can join or leave in a robust way, and clients can rely upon the availability of visible services until clear failure detections.

  4. Jini - Advantages • Moving to client-client model. • Network plug-and-work, dynamic configuration. • Easy access to resources anywhere on the network.

  5. Jini – Advantages (cont’d) • Erase the hard/software distinction. • Simplifies maintaining and altering a network.

  6. Jini – Java technology-centered • Based on Java • Dynamically download and run code • Built-in security • RMI • Depends on the Java environment rather programming.

  7. Jini – Architecture • Service • Proxy • Lookup Service • Client

  8. Services • Entity to be used by a person, program or another service. • No hardware/software distinction. • Dynamic nature – they can be added or withdrawal from a federation at any time. • Examples: printers, disks, applications, databases, etc.

  9. Disk Storage Database Printer Disk Storage Lookup Service • Each lookup service provides a list of available services, communication procedure and attributes. Printer Printer Database Database Calendar Lookup Service A Lookup Service B Client A Client B Client C

  10. Service sends a looking for lookup services Join Lookup Services respond Discovery/Join Protocol Printer Printer Printer Lookup Services Lookup Services

  11. Proxy • It’s an object that teaches the client how to communicate with the service. • The proxy is downloaded to the lookup services and then to clients. • It can be the service itself. • It can be an RMI stub. • It can act as a smart adapter.

  12. CurrencyConv Currency Conv Currency Conv Client Client Lookup Service Proxy – Currency Converter Proxy – Case 1

  13. 500 dollars Currency Conv Currency Conv 365 UK Pounds Service Client Proxy – Currency Converter Proxy – Case 2 RMI

  14. Dollar to UK pounds Currency Conv Currency Conv 0.75 Service Client Proxy – Currency Converter Proxy – Case 3 RMI, CORBA, Socket, SOAP

  15. Client sends a looking for lookup services Client searches for type of services. Lookup Services respond Lookup Services return the proxies. Client • Any entity that needs to use a service. • Goes through a matching protocol: Printer Printer Printer Printer Lookup Services Lookup Services Lookup Services Lookup Services

  16. Printer Interface Proxy registration The Whole Process • Registering the service: Lookup Service

  17. Lookup Service Printer Interface Looking up for printer interface Proxy The Whole Process (Cont’d) • Looking up for services : Client

  18. Client The Whole Process (Cont’d) • Using the service:

  19. Leasing • Services are registered for a bounded time. Special messages or Heartbeats. • Proxies are leased for a bounded time. • Clients can renew their proxies, if service permits. • The leasing process takes care of fault detection.

  20. Printer Interface Lookup Service Leasing (cont’d) Lookup Service X

  21. Printer Interface Leasing Renewal Yes, Leasing Time Leasing (cont’d) Lookup Service Printer interface Client

  22. References • www.jini.org • www.sun.com/software/jini/ • www.kedwards.com/jini/

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