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So I am thinking about building a hobby project, one off kind of thing, just to brush up on my programming/design.
It's basically a multi threaded web spider, updating the same data structure object->int.
So it is definitely overkill to use a database for this, and the only thing I could think of is a thread-safe singleton used to contain my data structure. http://web.archive.org/web/20121106190537/http://www.ibm.com/developerworks/java/library/j-dcl/index.html
Is there a different approach I should look in to?