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Use HashsetCache instead of FIFOSet for KnownHashes and SentHashes (n…
…eo-project#1389) * update * change fifoset to hashsetcache for knownhashes and senthashes * format * optimise HashSetCache * remove FIFOSet * remove FIFOSet and update ut * change List to LinkedList * remove bucket count upper limit * update exception message * Adding some comments * dotnet format * rename maxBucketCount * format * Cache count * Vitor suggestions * Update HashSetCache.cs * format * Fix * fix counting count * optimise * optimse * update List Co-authored-by: Shargon <[email protected]> Co-authored-by: Vitor Nazário Coelho <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| using System; | ||
| using System.Collections; | ||
| using System.Collections.Generic; | ||
|
|
||
| namespace Neo.IO.Caching | ||
| { | ||
| public class HashSetCache<T> : IReadOnlyCollection<T> where T : IEquatable<T> | ||
| { | ||
| /// <summary> | ||
| /// Sets where the Hashes are stored | ||
| /// </summary> | ||
| private readonly LinkedList<HashSet<T>> sets = new LinkedList<HashSet<T>>(); | ||
|
|
||
| /// <summary> | ||
| /// Maximum capacity of each bucket inside each HashSet of <see cref="sets"/>. | ||
| /// </summary> | ||
| private readonly int bucketCapacity; | ||
|
|
||
| /// <summary> | ||
| /// Maximum number of buckets for the LinkedList, meaning its maximum cardinality. | ||
| /// </summary> | ||
| private readonly int maxBucketCount; | ||
|
|
||
| /// <summary> | ||
| /// Entry count | ||
| /// </summary> | ||
| public int Count { get; private set; } | ||
|
|
||
| public HashSetCache(int bucketCapacity, int maxBucketCount = 10) | ||
| { | ||
| if (bucketCapacity <= 0) throw new ArgumentOutOfRangeException($"{nameof(bucketCapacity)} should be greater than 0"); | ||
| if (maxBucketCount <= 0) throw new ArgumentOutOfRangeException($"{nameof(maxBucketCount)} should be greater than 0"); | ||
|
|
||
| this.Count = 0; | ||
| this.bucketCapacity = bucketCapacity; | ||
| this.maxBucketCount = maxBucketCount; | ||
| sets.AddFirst(new HashSet<T>()); | ||
| } | ||
|
|
||
| public bool Add(T item) | ||
| { | ||
| if (Contains(item)) return false; | ||
| Count++; | ||
| if (sets.First.Value.Count < bucketCapacity) return sets.First.Value.Add(item); | ||
| var newSet = new HashSet<T> | ||
| { | ||
| item | ||
| }; | ||
| sets.AddFirst(newSet); | ||
| if (sets.Count > maxBucketCount) | ||
| { | ||
| Count -= sets.Last.Value.Count; | ||
| sets.RemoveLast(); | ||
| } | ||
| return true; | ||
| } | ||
|
|
||
| public bool Contains(T item) | ||
| { | ||
| foreach (var set in sets) | ||
| { | ||
| if (set.Contains(item)) return true; | ||
| } | ||
| return false; | ||
| } | ||
|
|
||
| public void ExceptWith(IEnumerable<T> items) | ||
| { | ||
| List<HashSet<T>> removeList = null; | ||
| foreach (var item in items) | ||
| { | ||
| foreach (var set in sets) | ||
| { | ||
| if (set.Remove(item)) | ||
| { | ||
| Count--; | ||
| if (set.Count == 0) | ||
| { | ||
| removeList ??= new List<HashSet<T>>(); | ||
| removeList.Add(set); | ||
| } | ||
| break; | ||
| } | ||
| } | ||
| } | ||
| if (removeList == null) return; | ||
| foreach (var set in removeList) | ||
| { | ||
| sets.Remove(set); | ||
| } | ||
| } | ||
|
|
||
| public IEnumerator<T> GetEnumerator() | ||
| { | ||
| foreach (var set in sets) | ||
| { | ||
| foreach (var item in set) | ||
| { | ||
| yield return item; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| IEnumerator IEnumerable.GetEnumerator() => GetEnumerator(); | ||
| } | ||
| } |
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