Understanding Java Sockets Communication
Explore the fundamentals of Java sockets, including client/server interaction, synchronized data objects, and multi-threaded servers and clients. Learn about socket communication, server/client synchronization, and examples such as echo client and KnockKnock server. Dive into multi-threaded server and client chat examples for a comprehensive understanding of Java socket programming.
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Presentation Transcript
Java Sockets Brad Vander Zanden
Agenda What are sockets Client/Server interaction Single client/server example Synchronized data objects Multi-threaded servers Multi-threaded clients Detecting client/server shutdown
Socket One end-point of a two-way communication link between two programs running on the network Typically one process is called the server Typically one process is called the client Connection Request p o r t p o r t lis te n client server
Server/Client Interaction (from Jonathan Engelsma s Java Sockets Tutorial-- https://www.youtube.com/watch?v=aEDV0WlwXTs) Processing New accept read write close SocketServer Server Synchronization Point Communication New Socket write read close Client stdin stdout
Single Client/Server Example echo client try with resources only works for Java 1.7 or later hydra machines have Java 1.6 (4/2014)
Synchronized Data Objects Data Object Processing New accept read write close SocketServer Server Synchronization Point Communication New Socket write read close Client stdin stdout
Synchronized Data Objects Not Who s There KnockKnock Server Example serve Knock Knock SENTKNOCK KNOCK WAITING serve KnockKnock Serve Try again. KnockKnock Serve Bye Who s There? Serve Clue No Input matches Clue + who ANOTHER SENTCLUE Input does not match Clue + who serve answer + Want another?
Multi-Threaded Servers Multi-Threaded KnockKnock Example
Multi-Threaded Client Chat Example New Socket write read close Client client thread stdout stdin
Multi-Threaded Client (Pseudo Code) Main Thread New Socket Get SocketRead and SocketWrite objects Create WriteConsoleThread w/ SocketRead obj While (more Stdin) Process/Write to SocketWrite Obj WriteConsoleThread While (more Socket Read Obj) Process line Write to console
Detecting client/server shutdown Occurs when socket read object returns null Socket.close() on other end does not signal other process of termination Server thread: Exit while loop, wrap up processing, and terminate
Multi-Threaded Client (Detecting Shutdown) Main Thread New Socket interrupted = false Get SocketRead and SocketWrite objects Create WriteConsoleThread w/ SocketRead obj While (more Stdin) if (interrupted) break Process/Write to SocketWrite Obj WriteConsoleThread While (more Socket Read Obj) Process line Write to console Notify Main thread of server shutdown by setting interrupted to true
