SE 550: Lecture 1

Overview

Course summary

Administrivia

Introduction to distributed programming

Example

Summary


Course summary

Fundamentals and techniques of developing distributed object-oriented applications, using a patterns-based approach.

Concepts covered include: networks, client-server architectures, dataflow networks, sockets, message-passing systems, serialization and remote method invocation.


Class structure

1. Network programming: the net package.

2. Streams programming: the io package.

3. Protocol specification: EBNF grammars.

4. Protocol implementation: parser generators.

5. Object serialization: object streams, SOAP.

6. Midterm exam.

7. RMI 1: introduction.

8. RMI 2: advanced topics.

9. RMI 3: implementation.

10. Object persistency: long-term state.

11. Final exam


Aims

Develop an understanding of distributed programming.

Learn techniques for developing distributed software.

Discover how distributed tools work `under the hood'.

Use patterns and OO to formalize solutions.

Objectives

See how to program in a patterns-based style in Java.

Learn the Java tools for distributed programming.

Understand how distributed architectures are implemented.


Administrivia: contact details

Lecturer: Alan Jeffrey

Email: ajeffrey@cs.depaul.edu

Office: CST 840

Phone: (312) 362 8322

Office hours: 3.30-5.00pm Tuesdays and Thursdays.


Administrivia: reading materials

Course home page: http://fpl.cs.depaul.edu/ajeffrey/se550/, contains lectures, homeworks, pointers to API documentation, sample source code...

Textbooks

Java Network Programming by Elliotte Rusty Harold, O'Reilly, 2nd edition, 2000.

Java RMI by William Grosso, O'Reilly, 2001.


Administrivia: prerequisites

Required:

SE 450: Object-Oriented Software Development

CSC 416: Foundations of Computer Science II

Wouldn't hurt:

DS 420: Foundations of Distributed Systems

SE 430: Object-Oriented Modeling

SE 552: Concurrent Software Development


Administrivia: required software

A Java 1.3--1.4 compiler, e.g. Sun's JDK.

An editor for Java source, e.g. XEmacs.

Pointers to software are on the course home page.


Administrivia: assessment

Mid-term exam (10 Feb 2004): 25%

Final exam (16 Mar 2004): 25%

Weekly homeworks (submitted using Courses OnLine, best 7 out of 8): 50%

All students must attend the mid-term and final exams

Late assignments will not be accepted without medical evidence.

Plagiarism or collusion is unacceptable, and will earn an F in the course.


Introduction to distributed programming

What is distributed programming?

What is the difference between distributed programming, parallel programming, and concurrent programming?

What is the difference between a host, a processor, and a thread?

Why distributed programming?

What is object oriented programming?

Why object oriented programming?

Why Java?


Introduction to distributed programming

What is a network? A router?

What is IP? An IP address? A host name? How do hostnames get matched to IP addresses? What is special about addresses 127.0.0.*? 192.168.0.*?

What is a firewall? A proxy? Network Address Translation?

What is TCP? What is a lossy network? What is an unordered network? What is a port? A socket?

What is the client-server model? What is the difference between the client and the server? What are example client/server pairs? Are there other models?


Client example: a simple HTTP client

Download the src.zip archive and unpack it.

Compile and run the HTTP client application with:

  cd src
  javac ajeffrey/teaching/http/client/Main.java
  java ajeffrey.teaching.http.client.Main

Gotchas:

How would we design such an application?


Client example: a simple HTTP client

Built-in classes used by the HTTP client:

Hand-built classes used by the HTTP client:

Plug the last three together to build a browser!


Server example: a simple HTTP server

Compile the HTTP server with:

  cd src
  javac ajeffrey/teaching/http/client/Main.java

Go to a directory containing a index.html file, and run the server:

  java ajeffrey.teaching.http.server.Main

Point a web browser at http://localhost:2000/hello.html

Gotchas:


Server example: a simple HTTP server

Additional built-in classes used by the HTTP server:

Additional hand-built classes used by the HTTP server:

Note: this server took less than a day to write!


Summary

In Java, we can write OO distributed applications using the java.net and java.io API.

Next week: stream-based I/O.

After that: the APIs in more detail.

Homework: Sheet 1, due before next lecture.

Reading: Harold Chapters 4, 10 and 11. Sun's API javadoc documentation on the Socket and ServerSocket classes.