🔴 refactor: use Bitfaster.Caching instead of Libplanet.LruCahceNet

CHANGES.md

@@ -51,6 +51,8 @@ To be released.
  -  (Libplanet.Net) Changed to no longer report `BlockHashDownloadState`
     and `BlockDownloadState` during preloading.  It is strongly advised
     not to rely on these to track the progress of preloading.  [[#3943]]
+ -  (Libplanet.Store) Optimized LRU Cache for `HashNode` and `BlockSet`.
+    [[#3962]]
 
 ### Bug fixes
 
@@ -69,6 +71,7 @@ To be released.
 [#3949]: https://github.com/planetarium/libplanet/pull/3949
 [#3950]: https://github.com/planetarium/libplanet/pull/3950
 [#3960]: https://github.com/planetarium/libplanet/pull/3960
+[#3962]: https://github.com/planetarium/libplanet/pull/3962
 
 
 Version 5.2.2

src/Libplanet.Store/BlockSet.cs

@@ -2,6 +2,8 @@
 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
+using BitFaster.Caching;
+using BitFaster.Caching.Lru;
 using Caching;
 using Libplanet.Types.Blocks;
 
@@ -10,12 +12,14 @@
     public class BlockSet : IReadOnlyDictionary<BlockHash, Block>
     {
         private readonly IStore _store;
-        private readonly LRUCache<BlockHash, Block> _cache;
+        private readonly ICache<BlockHash, Block> _cache;
 
         public BlockSet(IStore store, int cacheSize = 4096)
         {
             _store = store;
-            _cache = new LRUCache<BlockHash, Block>(cacheSize, Math.Max(cacheSize / 64, 8));
+            _cache = new ConcurrentLruBuilder<BlockHash, Block>()
+                .WithCapacity(cacheSize)
+                .Build();
         }
 
         public IEnumerable<BlockHash> Keys =>
@@ -68,7 +72,7 @@
 
                 value.ValidateTimestamp();
                 _store.PutBlock(value);
-                _cache.AddReplace(value.Hash, value);
+                _cache.AddOrUpdate(value.Hash, value);
             }
         }
 
@@ -82,7 +86,7 @@
         {
             bool deleted = _store.DeleteBlock(key);
 
-            _cache.Remove(key);
+            _cache.TryRemove(key);
 
             return deleted;
         }
@@ -153,7 +157,7 @@
 
         private Block? GetBlock(BlockHash key)
         {
             if (_cache.TryGet(key, out Block cached))
             {
                 if (_store.ContainsBlock(key))
                 {
@@ -162,14 +166,14 @@
                 else
                 {
                     // The cached block had been deleted on _store...
-                    _cache.Remove(key);
+                    _cache.TryRemove(key);
                 }
             }
 
             Block? fetched = _store.GetBlock(key);
             if (fetched is { })
             {
-                _cache.AddReplace(key, fetched);
+                _cache.AddOrUpdate(key, fetched);
             }
 
             return fetched;

src/Libplanet.Store/HashNodeCache.cs

@@ -1,11 +1,10 @@
-using System.Diagnostics;
+using System;
 using System.Security.Cryptography;
-using System.Threading;
 using Bencodex.Types;
+using BitFaster.Caching;
+using BitFaster.Caching.Lru;
 using Libplanet.Common;
 using Libplanet.Store.Trie;
-using LruCacheNet;
-using Serilog;
 
 namespace Libplanet.Store
 {
@@ -16,73 +15,26 @@ public class HashNodeCache
     {
         // FIXME: Tuned to 9c mainnet.  Should be refactored to accept cache size as an argument.
         private const int _cacheSize = 524_288;
-        private const int _reportPeriod = 60_000;
 
-        private LruCache<HashDigest<SHA256>, IValue> _cache;
-        private Stopwatch _stopwatch;
-        private int _attempts;
-        private int _hits;
-        private object _reportLock;
+        private ICache<HashDigest<SHA256>, IValue> _cache;
 
         internal HashNodeCache()
         {
-            _cache = new LruCache<HashDigest<SHA256>, IValue>(_cacheSize);
-            _stopwatch = new Stopwatch();
-            _attempts = 0;
-            _hits = 0;
-            _reportLock = new object();
-            _stopwatch.Start();
+            _cache = new ConcurrentLruBuilder<HashDigest<SHA256>, IValue>()
+                .WithMetrics()
+                .WithExpireAfterAccess(TimeSpan.FromMinutes(10))
+                .WithCapacity(_cacheSize)
+                .Build();
         }
 
         public bool TryGetValue(HashDigest<SHA256> hash, out IValue? value)
         {
-            lock (_reportLock)
-            {
-                Report();
-            }
-
-            Interlocked.Increment(ref _attempts);
-            if (_cache.TryGetValue(hash, out value))
-            {
-                Interlocked.Increment(ref _hits);
-                return true;
-            }
-            else
-            {
-                value = null;
-                return false;
-            }
+            return _cache.TryGet(hash, out value);
         }
 
         public void AddOrUpdate(HashDigest<SHA256> hash, IValue value)
         {
             _cache.AddOrUpdate(hash, value);
         }
-
-        private void Report()
-        {
-            long period = _stopwatch.ElapsedMilliseconds;
-            if (period > _reportPeriod)
-            {
-                Log
-                    .ForContext("Source", nameof(HashNodeCache))
-                    .ForContext("Tag", "Metric")
-                    .ForContext("Subtag", "HashNodeCacheReport")
-                    .Debug(
-                        "Successfully fetched {HitCount} cached values out of last " +
-                        "{AttemptCount} attempts with hitrate of {HitRate} and " +
-                        "{CacheUsed}/{CacheSize} cache in use during last {PeriodMs} ms",
-                        _hits,
-                        _attempts,
-                        (double)_hits / _attempts,
-                        _cache.Count,
-                        _cache.Capacity,
-                        period);
-
-                _stopwatch.Restart();
-                Interlocked.Exchange(ref _attempts, 0);
-                Interlocked.Exchange(ref _hits, 0);
-            }
-        }
     }
 }

src/Libplanet.Store/Libplanet.Store.csproj

@@ -5,6 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="BitFaster.Caching" Version="2.5.2" />
     <PackageReference Include="System.Collections.Immutable" Version="1.*" />
     <PackageReference Include="Bencodex" Version="0.16.0" />
     <PackageReference Include="Caching.dll" Version="1.4.0.1" />