Distributed Objects

Learn about distributed objects

how are objects a great match for distributed systems?

encapsulated state, interact via messages, strong notion of interfaces, share state through shared objects

distributed object call structure 1

stub object in client space, accessed as a local call

distributed object call structure 2

marshal and pass across the network

distributed object call structure 3

skeleton object in server space converts message into another local call on that side

message oriented middleware

organised around sending messages between processes, messages are queued at intermediate message servers

difference 1

rpc and distributed objects are synchronous, messages are asynchronous

difference 2

a message may pass through several message servers between sender and eventual receiver