Lec24 - Today Middleware and Distributed Objects Case study...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Computer Science Lecture 23, page CS677: Distributed OS Today: Middleware and Distributed Objects Case study: EJBs (Enterprise Java Beans) Case study: CORBA 1 Computer Science Lecture 23, page CS677: Distributed OS Distributed Objects Figure 10-1. Common organization of a remote object with client-side proxy. 2
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Computer Science Lecture 23, page CS677: Distributed OS Distributed Objects vs. RPC RPC : Remote Procedure Call Provides argument marshalling / unmarshalling Server handles invocation Distributed Objects Remote methods on remote objects RPC + distributed object references Distributed object operation: Server side: create object, register it (register with what?) (always in this order?) Client side: get object reference (from where?), invoke method 3 Computer Science Lecture 23, page CS677: Distributed OS Distributed Objects through History DCOM ONC RPC DCE RPC CORBA Java RMI EJB A brief and incomplete history of commercially used RPC and distributed object systems The vision a Grand Distributed System The reality Client/Server 4
Background image of page 2
Computer Science Lecture 23, page CS677: Distributed OS Naming: Object References Interoperable object reference: language-independent techniques for referring to objects CORBA object reference 5 Computer Science Lecture 23, page CS677: Distributed OS Object references and Naming First versions of CORBA used opaque object references How do you locate the object? Via a location service. What is the interface to the location service? How do you invoke the location service? Java (and CORBA 3.0) use transparent object references Can be decoded at the client Java reference can encode all information (e.g. code) needed to invoke an object. 6
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Computer Science Lecture 23, page CS677: Distributed OS Binding Static vs. Dynamic binding What is the difference? Advantages of static binding? Of dynamic binding? What state is involved in client binding?
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 15

Lec24 - Today Middleware and Distributed Objects Case study...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online