Broadcast messenger

Messenger created as a project for studies. Simple broadcast messenger to send text messages, images (.jpg format) or sound files (.wav format) from one client to all clients connected to server .

Table of contents

• Technologies
• Run application
• Features
• Design patterns
• UML Diagram

Technologies

Java 15

How to run

Run server (Only one)

$ javac Server.java
$ java Server

Run client/s

$ javac Client.java
$ java Client

Features

Send text message (client window)

The client can send a message(with the generated information about who sent it), that will be delivered to all clients connected to the server

How to send message:

$ text
$ This is a message

How other clients will see this message:

$ Client 1: This is a message

Send .jpg file from jpg folder (client window)

The client can send a photos in .jpg format. Other clients will receive information about the author of message and image will open in external window

How to send picture (To the test you can send 1.jpg image available in repository):

$ image
$ image_name.jpg

Information about author will appear as:

$ Received image from client 1

Send sound file from wav folder (client window)

The client can send a sound file in .wav format. Other clients will receive information about the author of the message and the sound will play.

How to send picture (To the test you can send sound.wav file available in repository):

$ sound
$ sound.wav

Information about author will appear as:

$ Received audio file from client 1

Disconnect client from server

To disconnect client just type:

$ logout

Used design patterns:

• Observer : After each received message by Server, all other clients connected to the server are notified using notifyObservers() method in the Server class
• Chain Element : Allows requests to be forwarded to subsequent object along the chain(TextElement -> ImageElement -> AudioElement), when that object is not responsible for the received event
• Template method pattern : Creates a skeleton of the algorithm and allows the subclasses to override methods of parent class except template method

UML diagram