Jini Technology 제 1 회 한국 자바 개발자 컨퍼런스 발표자 : 강신동 Mobile : 016-201-5053…

Jini Technology

제 1 회 한국 자바 개발자 컨퍼런스

발표자 : 강신동Email : [email protected] 강신동 @idosi.comMobile : 016-201-5053소속 : ㈜ idosi.com 대표이사주최 : JavaCommunity.Org발표일자 : 2000 년 4 월 9 일

목 차1. Jini 개요2. Jini site 와 개발도구3. bytecode 이동과 instance 이동4. Discovery5. Join6. Lookup7. Lookup reservation8. Lease9. Using back-end process10. RMI diagram11. Jini diagram

강신동 ([email protected],t , 강신동 @idosi.com)

Jini Home Network

Jini Client - Server

Web server chip

Jini 의 실예


Jini site 와 개발도구

JDK 1.2 (Java 2) 이상rmid : lookup daemon

Jini Technology Starter Kit (jini1.1 alpha) reggie : sun’s lookup servicehttpd

web server for downloading rmi’s stub class

Lookup service 이용을 위한 기본도구

Jini web sitehttp://java.sun.com/jinihttp://www.jini.orghttp://artima.com/jinihttp://jiniworld.chonnam.ac.kr


bytecode 이동과 instance 이동

bytecode 의 network 이동

instance 의 network 이동

Ex) appletclient 중심개념실행코드가 run-time 상태의 client JVM 으로 이동모든 instance 는 client 의 JVM 에서 생성된다

Ex) Jiniservice 중심개념interface 이용실행코드와 data 의 run-time 시 이동service 에서 만들어진 instance 가 동적으로 client 의

JVM 에서 즉시 이용될 수 있는 특징network 에서 이동된 instance 는 client 에서 만들어진 instance 처럼 이용


Discovery

Lookup-service

ServiceClient

Service 는 자신을 등록하기 위해 network 상에서 Lookup service 를 찾는다 .

Client 는 등록된 Service 를 찾기 위해 network 상에서 Lookup service 를 찾는다 .


Discovery protocolLookup ServiceDiscoverer

Request messageUDP multicast

Response messageTCP unicast

Multicast request protocol

Lookup ServiceDiscoverer

Request messageTCP unicast


Multicast announcement protocol

Announcement messageUDP multicast

Request messageTCP unicast


Unicast discovery protocol강신동 ([email protected],t , 강신동 @idosi.com)

Discovery (receive ServiceRegistrar)

Lookup-service

Service

Client

ServiceRegistrar

ServiceRegistrar

Service JVM

Client JVM

Lookup JVM


Discovery (code)UnicastDiscovery

MulticastDiscovery

Lookup-service 의 위치를 알고있는 경우TCP/IP Socket 이용 직접 접속 (port 4160)synchronous processingLookupLocator lookup = new LookupLocator(“jini://jini.idosi.com”); ServiceRegistrar registrar = lookup.getRegistrar();

Lookup-service 의 위치를 모르는 경우Multicast 이용 lookup-service 응답기다림service 에서 cient 로 TCP/IP Socket 이용연결asynchronous processingLookupDiscovery discover = new LookupDiscovery(LookupDiscovery.ALL_GROUPS);discovery.addDiscoveryListener(listener);public void discovered(DiscoveryEvent evt){ ServiceRegistrar[] registrars = evt.getRegistrars();}


Join (service copy)

Service

Service Copy

Service Proxy

ServiceRegistrar

ServiceItem

ServiceItem

Service JVM


Join (regist service proxy)

Lookup-service

Service

Service Copy

Service Proxy registerServiceRegistrar

Service JVM

Lookup JVM


Join (code)

ServiceRegistrar registrar = …;ServiceID id = null; // 전세계에서 유일한 id 부여 Entry entry = null; // service 의 부가정보제공MyServiceInterface proxy = createServiceInterfaceInstance();ServiceItem item = new ServiceItem(id, proxy, entry);long leaseTime = 1 * 60 * 1000; // msecServiceRegistration registration = registrar.register(item, leaseTime);


Lookup (receive service copy)

Lookup-service

Lookup JVMClient

ServiceTemplate

Service copy

Client JVM


Lookup (code)

ServiceRegistrar registrar = …;ServiceID id = null; // 전세계에서 유일한 id 부여 Entry entry = null; // service 의 부가정보제공Class[] types = { MyServiceInterface.class };ServiceTemplate template = new ServiceTemplate(id, types, entry);Object o = registrar.lookup(template);if (o instanceof MyServiceInterface){ MyServiceInterface service = (MyServiceInterface) o; Object result = service.callMyMethod();}


Lookup Reservation

Client

ServiceTemplate

Client JVM

RemoteEventListener

Lookup-service

Lookup JVM

notify

notifyServiceEvent

ServiceItem Service Copy


Lookup Reservation (code)

ServiceRegistrar registrar = …..;Entry entry = null;long leaseTime = 1 * 60 * 1000;EventRegistration evtreg = registrar.notify(template, ServiceRegistrar.TRANSITION_NOMATCH_MATCH, myRemoteEventListener, entry, leaseTime);MyRemoteEventListener extends UnicastRemoteObject implements RemoteEventListenerpublic void notify(RemoteEvent evt) throws RemoteException, UnknownEventException{ if (evt instanceof ServiceEvent) { ServiceEvent sevt = (ServiceEvent) evt; ServiceItem item = sevt.getServiceItem(); MyServiceInterface service = (MyServiceInterface) item.service; Object result = service.callMyMethod(); }}


Lookup federation topologyCommunity of communities

Hierarchies Stars Island


Lease (service side)

Lookup-service

Serviceregister

ServiceRegistrar

Service JVM Lookup JVM

ServiceRegistration

Leaserenew()


Lease (service code)

ServiceRegistration registration = registrar.register(…….);public void run() { while (true) { try { Lease lease = registration.getLease(); long expiration = lease.getExpiration(); long sleepTime = computeSleepTime(); Thread.sleep(sleeptime); lease.renew( 1 * 60 * 1000); } } }

Lease expiration

time linenownow

renew zone


Lease (client side)

Lookup-service

notifyServiceRegistrar

Client JVM Lookup JVM

EventRegistration

Leaserenew()

Client


Lease (client code)

ServiceRegistration servreg = registrar.register(……);Lease lease = servreg.getLease();long expiration = lease.getExpiration();if ( RENEW_ZONE){ lease.renew(LEASE_TIME);}

EventRegistration evtreg = registrar.notify(……);Lease lease = evtreg.getLease();long expiration = lease.getExpiration();if ( RENEW_ZONE){ lease.renew(LEASE_TIME);}

service renew lease

client renew lease


Using Back-end Process

Lookup-service

Lookup JVM

Service

Service ProxyRemote Server

Client

RMI, Socket ...

Service JVM Client JVM

choke point


RMI diagram

RemoteInterface

RemoteImpl

UnicastRemoteObject

Skeleton Stub RemoteInterface

rmiregistry

webserver

client

Server JVMClient JVM

bind

lookup

rmi

stubcode


Jini diagram (service copy)

MyInterface

Serializable

MyService

rmid (reggie)

register

MyInterface

client

lookup

MyService

Web server

MyInterface

Service JVM

Client JVM강신동 ([email protected],t , 강신동 @idosi.com)

Jini diagram (service proxy)

MyInterface Serializablermid (reggie)

register

MyInterface

client

lookup

MyInterface

Service JVMClient JVM

RemoteProtocol

proxy

proxy

RemoteInterrface

BackendSkeleton Stub

rmi

Web server

Documents

Jini Technology 제 1 회 한국 자바 개발자 컨퍼런스 발표자 : 강신동 Mobile : 016-201-5053…