This essay does not describe an existing computer program, just one that should exist. This essay is about a suggested student project in Java programming. This essay gives a rough overview of how it might work. I have no source, object, specifications, file layouts or anything else useful to implementing this project. Everything I have prepared to help you is right here.
This project outline is not like the artificial, tidy little problems you are spoon-fed in school, when all the facts you need are included, nothing extraneous is mentioned, the answer is fully specified, along with hints to nudge you toward a single expected canonical solution. This project is much more like the real world of messy problems where it is up to you to fully the define the end point, or a series of ever more difficult versions of this project and research the information yourself to solve them.
Everything I have to say to help you with this project is written below. I am not prepared to help you implement it; or give you any additional materials. I have too many other projects of my own.
Though I am a programmer by profession, I don’t do people’s homework for them. That just robs them of an education.
You have my full permission to implement this project in any way you please and to keep all the profits from your endeavour.
Please do not email me about this project without reading the disclaimer above.In database applications you often need unique numbers for identifying things, e.g. account numbers, package ids, ticket numbers… If you don’t require absolute uniqueness, here are two techniques:
The obvious answer is to have a centralised RAM-resident counter that you increment every time somebody needs a new unique number. There are three problems with that simplistic approach.
Ok then, how do you handle it? A number server consists of three threads.
Another approach is to use the system clock as your basic unique number generator. You must be very sure it is accurate. If you crash and pick up where you left off, there is no danger of reissuing old numbers.
Most computers now have one or more Ethernet cards. Every ethernet card on the planet is manufactured with a unique 48-bit MAC (Media Access Control) address. Unfortunately you need JNI (Java Native Interface) to get at it from Java. This gives you a way of stamping generated serial numbers with the source that generated them.
There is now a UUID (Universally Unique Identifier) specification. UUIDs (Universally Unique Identifiers) are 128-bit integers.
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