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Subject [GitHub] [lucenenet] NightOwl888 opened a new pull request #441: Reviewed concurrent collections (Closes #417)
Date Sun, 14 Mar 2021 01:13:42 GMT

NightOwl888 opened a new pull request #441:

   Combined with #439, this closes #417.
   This review included the following collections:
   - `LurchTable<TKey, TValue>`
   - `ConcurrentDictionary<TKey, TValue>`
   - `ConcurrentQueue<T>`
   - `ConcurrentStack<T>`
   - `ConcurrentBag<T>`
   - `BlockingCollection<T>`
   With the exception of `FieldCacheImpl`, all access to these collections were checked to
ensure proper use. Locks were added in cases where they were missing, and collections were
swapped for non-synchronized versions in cases where there was no reason to use one. 
   There are a few places we use `ConcurrentDictionary<TKey, TValue>` just to take advantage
of the fact that its enumerator allows modification of the collection without throwing an
exception. `FEATURE_DICTIONARY_REMOVE_CONTINUEENUMERATION` was added so we will be able to
use `Dictionary<TKey, TValue>` in .NET 5.x+ because it now supports modification during
enumeration also.
   There were a few bugs found and fixed with `GetOrAdd` method calls and one found in the
`LuceneTestCase` class (the base class for all tests in the TestFramework) which replaced
the collection with a concurrent one, but didn't take into account the other related code
that was inside of the lock that was removed.

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