The Jini Architecture Bruno Souza Java Technologist, Sun Microsystems
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1 The Jini Architecture Bruno Souza Java Technologist, Sun Microsystems J1-717, Jim Waldo 1
2 Why Jini Technology Network plug and work Enables a service-based architecture Spontaneous networking Erase the distinction between hardware and software A distributed computing infrastructure to making writing distributed programs easier J1-717, Jim Waldo 2
3 Jini Technology Builds on Java Technology Feature Java virtual machine Portable object code Downloadable code Unified type system Benefit Homogeneous network Architecture independence Dynamic environment No impedance mismatch J1-717, Jim Waldo 3
4 Simple, Reliable, and Flexible Based on the Java programming language Interfaces designed for robustness Services come and go without administration Federation, not central control J1-717, Jim Waldo 4
5 Structure of Jini Technology Jini Services Jini Infrastructure Jini Programming Model Java 2 Platform JavaSpaces Transaction Managers Printing, Storage, Databases... Discovery Lookup Service Leasing Distributed Events Transactions Java RMI Java VM J1-717, Jim Waldo 5
6 Registering a Service Discovery Request Service Proxy Object Discovery Response Service Registration Jini Service Lookup Service J1-717, Jim Waldo 6
7 Finding a Service Discovery Request Discovery Response Lookup Request Service Proxy Object Lookup Response Jini Service Lookup Service J1-717, Jim Waldo 7
8 Using a Service Service Proxy Object Jini Client Jini Service J1-717, Jim Waldo 8
9 Wire Protocol Independence Communication is between the service and its proxy Wire protocol is a private matter Standard protocol Custom, one time protocol Protocol can change RMI semantics core to functionality J1-717, Jim Waldo 9
10 Federations of Services Minimal agreement Discovery protocol Lookup interface Interfaces define a service Simple interaction patterns Time-based resource allocation Distributed event delivery Voting for consensus Everything else is left to the participants J1-717, Jim Waldo 10
11 More Than Devices Services can be hardware or software Dynamic lookup allows service introduction When services become available When services are updated Services are network-available components J1-717, Jim Waldo 11
12 Enabling Change Over Time Base interfaces can be extended Add new functionality Combine functionality Old clients can use base interface New clients can use extended interface Allows local evolution J1-717, Jim Waldo 12
13 Objects on the Network Polymorphism allows change Moving code is key Separates what from how Allows changing behavior Object oriented design patterns apply Merges agent technology and more standard approaches to distributed computing J1-717, Jim Waldo 13
14 What About Legacy? We live in the real world Not every program is written in the Java programming language Not every device can support a Java virtual machine Most legacy code has yet to be written J1-717, Jim Waldo 14
15 Objects to the Rescue Java technology is only required For the proxy object On the network Legacy code can offer a proxy object Proxy is Java technology bytecodes Speaks a private protocol to the legacy code Legacy code can be wrapped Java programming language calling via Java Native Interface (JNI) J1-717, Jim Waldo 15
16 Network Proxies Devices can proxy via another device Simple device provides service type, code location More competent device provides Jini technology interaction Proxy object can talk to either device One network proxy for multiple devices Network proxy can also bridge networks TCP/IP to firewire/bluetooth/ir/... Jini technology-based system to HAVI J1-717, Jim Waldo 16
17 Interface Definition The Jini Technology Community Deciding on base interfaces and classes Driven, shepherded, or independent Currently groups for printing and storage Other standards groups If it has a Java programming language interface, it has a Jini service interface De facto Let the market decide J1-717, Jim Waldo 17
18 Where Next First services coming soon Some shown in the exhibition Security Scaling up Most scale issues are user issues Build the community J1-717, Jim Waldo 18
19 For More Information The Jini Technology Series The Jini Specification JavaSpaces : Principles, Patterns, and Practice J1-717, Jim Waldo 19
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