RMI_Notes_PPT.pptx_ppt_ppt_agvsghavshavy

RMI (Remote Method Invocation) is a Java API that allows an object in one Java Virtual Machine (JVM) to invoke methods on an object located in another JVM (possibly on a different machine).

It is Java’s way of implementing distributed object communicatio

1. Remote Method Invocation (RMI) .

2. What is RMI? - Allows calling methods on objects located on another machine - Extends object-oriented programming to distributed systems

3. Design Issues in RMI - Objects contain data + methods - New objects can be created dynamically - Object state can change after method call - One method can call others - Exception handling is important - Garbage collection frees unused objects

4. Distributed Objects - Objects may be on different computers - Client-Server model: client requests, server executes - Advantages: • Replication for reliability • Migration for performance • Encapsulation (state hidden) • Synchronization for multiple clients

5. Local vs Remote Invocation - Local invocation: same computer - Remote invocation: across computers using RMI

6. Remote References & Interfaces - Remote references: special reference to call remote methods - Remote interfaces: define methods callable remotely - Java RMI: interfaces extend Remote - CORBA: uses IDL

7. Actions in Distributed Objects - Remote calls may trigger further calls - New objects can be created remotely - References shared with clients

8. Garbage Collection & Exceptions - Java: automatic distributed garbage collection - C++: manual memory management - Exceptions may occur due to: • Network delay or crash • Lost messages - Must handle errors (timeouts, access issues)