1. Remote Method Invocation by James Hunt, Joel Dominic, and Adam Mcculloch

2. CONTENT  What is RMI  Why is it used  How is it used

3. WHAT ARE OBJECTS Encapsulation of…  Data including pointers to other objects  Methods used to manipulate the data

4. WHAT DOES RMI REALLY MEAN? RMI stands of Remote Method Invocation Essentially allows for a client to perform operations on objects stored on a separate networked machine Idea for RMI taken from RPC or Remote Procedure Call  Basically just the Procedural Programming approach to RMI  Allows for procedures to be executed on a separately networked machine

5. COMMON USES/INTERFACES FOR RMI RMI is used in most distributed java applications  Solely in java originally  Has been ported to CORBA (Common Object Request Broker Architecture) CORBA allows RMI to be used by non java languages

6. HOW IT WORKS  A client machine will make a method call for remote objects that reside on a server  The server will then run that method on the object  Finally, the server will return the results of that method to the client

7. PASSING OBJECT PARAMETERS Serializing objects: In java (main language for RMI) objects must use the serializable interface  Everything within the object is encoded into a byte stream  Non primitive objects being encoded must also implement the serializable interface

8. STUBS and SKELETONS Stubs: Resides on client machine Contains:  Parent Object Reference  Method call  Parameters needed for execution Skeletons: Resides only on the server Unwraps the stub to be run server side Translates stubs into actual object calls

9. Diagram courtesy of: http://www.cs.uiowa.edu/~slonnegr/wpj/RMI.pdfhttp://www.cs.uiowa.edu/~slonnegr/wpj/RMI.pdf

10. Java code courtesy of: http://download.oracle.com/javase/tutorial/rmi/implementing.htmlhttp://download.oracle.com/javase/tutorial/rmi/implementing.html

11. SUMMARY  Client machine makes a method request on an object that resides on the Server  Client must pass in serialized objects as parameters and then use Stubs and Skeletons to wrap and unwrap these objects  Server passes information back to the client through serialized objects

12. SOURCES http://www.cs.uiowa.edu/~slonnegr/wpj/RMI.pdf http://www.oracle.com/technetwork/java/javase/tech/index-jsp-136424.html http://download.oracle.com/javase/tutorial/rmi/index.html http://download.oracle.com/javase/tutorial/rmi/implementing.html http://www.daimi.au.dk/~mailund/scripting2005/lecture-notes/rmi.html http://notes.corewebprogramming.com/student/RMI.pdf http://infolab.stanford.edu/CHAIMS/Doc/Details/Protocols/rmi/rmi_description.html http://www.javacamp.org/moreclasses/rmi/rmi22.html http://www.sentex.net/~pkomisar/RMI.html http://java.sun.com/developer/technicalArticles/ALT/sockets/