Java and Client/Server
Java has some strict security restrictions. An applet can only open a socket to the server on which it was loaded. Applications, on the other hand, are allowed to open sockets to any machine. My client is written as a stand-alone application for this reason. (I don't have access to a web server that will allow me to run my CB server.) There are very few major differences between an applet and an application. An applet extends the class applet and an application extends the class frame. Refer to a book on Java for more specific details.
This project was my first real attempt at client-server programming. I'm hooked! With the basic server written, it is possible to extend the code to do many things. I would like to eventually redesign the user interface to make it look better and be easier to use. Having Linux at home has made the program development process much easier. I was able to use the same tools on both my home system and the Sun workstations at school so a simple recompilation was all that was necessary for the server to run on a Sparc 5. My hope is that someone else will find this work useful. No references could be found in any Java book (I have three) to address this specific application. While client-server applications were available in all of these books, all of the servers were written in Java. Java works well for writing servers, but is not as fast and requires more system resources to run. Every language has its place and Java is no exception. Java is very useful as a client programming language; it's here to stay.
Take a look at the listings:
Java in a Nutshell
David Flanagan (1996, O'Reilly & Associates, Inc)
Java Programming Explorer
Neil Bartlett, Alex Leslie, and Steve Simkin (1996, Coriolis Group Books)
Teach Yourself Java in 21 Days
Lemay and Perkins (1996 Sams.net publishing)
Internetworking with TCP/IP vol III
Comer and Stevens (1993, Prentice-Hall, Inc)
The C Programming Language, second edition
Kernighan and Ritchie (1988, 1978, Prentice Hall)
Various Linux man pages
Joe Novosel (firstname.lastname@example.org) has been an avid computer hobbyist since 1981, when his first computer (Radio Shack Color Computer) had a whopping 4K of memory (including video memory!). He has been using Linux for about two years—since version 1.1.47—and thinks Linux brings back the excitement of his early days in computing. After several years in the electrical trade, Joe decided to return to school and is now a Junior at Georgia Tech, where he pursues a degree in Computer Science.
Practical Task Scheduling Deployment
July 20, 2016 12:00 pm CDT
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
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With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide