A Short Java RMI Tutorial

May 27, 2009Download as ppt, pdf21 likes7,268 views

This document provides an overview of how Java RMI (Remote Method Invocation) works. It discusses the key RMI classes and interfaces, the general architecture involving remote objects, stubs, skeletons and the registry. It also demonstrates building the required classes for a simple weather server example - the remote interface, remote object implementation, server and client. The document walks through compiling and running the weather server to showcase a basic RMI application.

A Short Java RMI Tutorial Albert Guo [email_address]

Agenda Introducing RMI The RMI classes and interfaces The General RMI Architecture Demo – build up 4 required classes Demo – compiling and running the Weather Server

Introducing RMI An RMI application is often composed of two separate programs, a server and a client. The server creates remotes objects and makes references to those objects accessible. Then it waits for clients to invoke methods on the objects. The client gets remote references to remote objects in the server and invokes methods on those remote objects. Users use object as though it were a regular, local object Network connections happen automatically behind the scenes Java ‘serialization’ lets you pass complex data structures over the network without writing code to parse and reconstruct them

Introducing RMI (cont.) A distributed object application has to handle the following properties: Locate remote objects Communicate with remote objects Load class bytecodes for objects that are passed as parameters or return values

Interfaces and Classes in the java.rmi package

Stub and Skeleton Package identifier of remote object Package method identifier Marshall parameters Send package to server skeleton Unmarshall parameters Calls return value or exception Marshall method return Send package to client stub Stub Operation Skeleton Operation

Class Diagram – four required classes 1 2 3 4

The interface for remote object The remote interface must satisfy the following conditions: It must extend the interface Remote. Each remote method declaration in the remote interface must throw RemoteException

The remote object implementation The class must extend UnicastRemoteObject and implement the remote object interface The constructor should throw RemoteException

The RMI Server The server builds an object and register it with a particular URL Using Naming.bind(throw AlreadyBoundException if a previous binding exists) or Naming.rebuind (replace any previous bindings)

The RMI Client Lookup the object from the host using Naming.lookup, cast it to any appropriate type, then use it like a local object

Demo – compiling and running the Weather Server

Compiling and running the Weather Server 1. generate the client stub and server Skelton 2. startup the RMI registry

Compiling and running the Weather Server 3. startup the server 4. start the client

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A Short Java RMI Tutorial

1. A Short Java RMI Tutorial Albert Guo [email_address]

2. Agenda Introducing RMI The RMI classes and interfaces The General RMI Architecture Demo – build up 4 required classes Demo – compiling and running the Weather Server

3. Introducing RMI An RMI application is often composed of two separate programs, a server and a client. The server creates remotes objects and makes references to those objects accessible. Then it waits for clients to invoke methods on the objects. The client gets remote references to remote objects in the server and invokes methods on those remote objects. Users use object as though it were a regular, local object Network connections happen automatically behind the scenes Java ‘serialization’ lets you pass complex data structures over the network without writing code to parse and reconstruct them

4. Introducing RMI (cont.) A distributed object application has to handle the following properties: Locate remote objects Communicate with remote objects Load class bytecodes for objects that are passed as parameters or return values

5. Interfaces and Classes in the java.rmi package

6. The RMI classes and interfaces

7. The General RMI Architecture

8. Remote object interface implemenation

9. RMI Architecture

10. Runtime Architecture

11. Stub and Skeleton Package identifier of remote object Package method identifier Marshall parameters Send package to server skeleton Unmarshall parameters Calls return value or exception Marshall method return Send package to client stub Stub Operation Skeleton Operation

12. Demo – build up 4 required classes

13. Class Diagram – four required classes 1 2 3 4

14. The interface for remote object The remote interface must satisfy the following conditions: It must extend the interface Remote. Each remote method declaration in the remote interface must throw RemoteException

15. The remote object implementation The class must extend UnicastRemoteObject and implement the remote object interface The constructor should throw RemoteException

16. The remote object implementation

17. The RMI Server The server builds an object and register it with a particular URL Using Naming.bind(throw AlreadyBoundException if a previous binding exists) or Naming.rebuind (replace any previous bindings)

18. The RMI Client Lookup the object from the host using Naming.lookup, cast it to any appropriate type, then use it like a local object

19. The RMI Client

20. Demo – compiling and running the Weather Server

21. Compiling and running the Weather Server 1. generate the client stub and server Skelton 2. startup the RMI registry

22. Compiling and running the Weather Server 3. startup the server 4. start the client

A Short Java RMI Tutorial

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