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Ard Schrijvers authored
The Urlset object should have to think about synchronization. It is the code that uses the Urlset that shouldn't expect the Urlset to be thread-safe (just like a HashSet isn't thread-safe. It make much more sense to not give all the workers a reference to the same urlset object but all have their own A seperate note is that I really think the worker should not extend from Thread and a lot of the complex logic can be replaced by a simple executer service (cherry picked from commit 031750fa)
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