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.
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, 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.This program has two uses:
|filename||The name of the file to be checked.|
|timestamp||The date and time the file should be stamped.|
|size||The size the file is supposed to be in bytes.|
|checksum||The 32-bit Adlerian checksum of the file. This can be used to detect corruption. If the computed checksum for the customer’s file does not match this, it means it is corrupt, possibly virus infected.|
|source||Where to get a copy of this file if it is missing or corrupt. Possible sources include:
|needs||What other files must be present if this file is present.|
|needed by||When any of these files are present, this file must be present. REQUIRED means the file must always be present, irrespective of what other files are present.|
If the app could not be repaired, it would be removed entirely including registry entries.
There are four main difficulties to solve:
You might look at the Jardiff protocol in Java Web start for fetching just parts of jars you need, or the Replicator which delivers bundles of compressed files. The server might deliver bundles of compressed files, individual files, or archives composed on the fly of just what the client needs, taking the pieces from pre-compressed files.
available on the web at:
optional Replicator mirror
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