Hello JINI

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Hello JINI

• 8/5 Home network seminar jini team

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Contents
1. JINI BASIC.
2. Source Files.
3. Next Plan.
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JINI BASIC

• Service such as a printer, scanner, storage
  device, a software service etc.
• client It would like to make use of this
  service.
• lookup service (LUS) This essentially is a
  service locator

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A Simple JINI Architecture
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Registering JINI Services

• Discovery Finding Lookup Services
• Join Registering a Service (Jini Service)

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Registar Parameter(1)

• ServiceItem(ServiceID id, Object service, Entry
  attrSets)
• id - universally unique identifier (UUID) for
  registered services (128-bit value). Service IDs
  are intended to be generated only by lookup
  services, not by clients.
• service the object implementing the actual
  Jini Service i.e. the Java proxy object
• attrSets attribute sets include extra
  information about the service. Examples of these
  are icons classes that provide GUIs for the
  service and objects that give more information
  about the service.

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Registar Parameter(2)

• Leases
• Jini uses leases to keep information about
  services current Access to a service is leased
  for a given duration If a client wants the
  service longer, it must request a lease renew
  before the end of the lease At the end of a
  lease, a clients access to the service is
  terminated
• Lease.ANY - the service lets the lookup service
  decide on the time
• Lease.FOREVER - the request is for a lease that
  never expires

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An Enhanced JINI Architecture
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Ready to Run JINI(1)

• HTTP Server
• need to start a HTTP server for communicating
  data files between the Jini client/service and
  the Jini Lookup Service.
• java -jar -classpath JINI_CLASSPATH
• JINIHOME\lib\tools.jar -port 8081 dir
• JINIHOME\lib verbose

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Ready to Run JINI(2)

• RMID Daemon
• A RMI daemon for executing remote code (if the
  Jini service is actually remote)
• rmid -J-Dsun.rmi.activation.execPolicynone
• Enable logging for debugging purposes.
• -J-Djava.rmi.server.logCallstrue

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Ready to Run JINI(3)

• The Jini Lookup Service
• java -jar -classpath JINI_CLASSPATH
• -Djava.security.policyJINIHOME/example/lookup/
  policy.all
• JINIHOME/lib/reggie.jar
• http//localhost8081/reggie-dl.jar
• JINIHOME/example/lookup/policy.all
• reggie_log public

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Needed Files

• 1. MyServer.java The Jini service which is an
  implementation of the MyServerInterface
• 2. MyServerInterface.java The interface to the
  Jini service i.e. the Java Proxy object
• 3. MyClient.java The client who wishes to make
  use of this service.

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Source Code

• The Server Code(MyServer.java)

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Source Code(Cont)

• The Server Interface Code(MyServerInterface.java)

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Source Code(Cont)

• The Client Code(MyClient.java)

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Next Plan

• 1. Running Hello JINI service using Acquired
  Source
• 2. Learning RMI Comm.
• Reference Site Cardiff University of Computer
  Science
• http//users.cs.cardiff.ac.uk/Ian.J.Taylor/Distr
  ibutedSystems/Notes/lecture7.pdf
• Overview of JINI http//pandonia.canberra.e
  du.au/java/jini/tutorial/Overview.htmlJini