Revert "perf: Move mutex to the partition level (#5486)"

This reverts commit 94decc7.

Author: ximinez

include/xrpl/basics/SHAMapHash.h

@@ -21,6 +21,7 @@
 #define RIPPLE_BASICS_SHAMAP_HASH_H_INCLUDED
 
 #include <xrpl/basics/base_uint.h>
+#include <xrpl/basics/partitioned_unordered_map.h>
 
 #include <ostream>
 

include/xrpl/basics/TaggedCache.h

@@ -90,6 +90,9 @@ class TaggedCache
     int
     getCacheSize() const;
 
+    int
+    getTrackSize() const;
+
     float
     getHitRate();
 
@@ -167,6 +170,9 @@ class TaggedCache
     bool
     retrieve(key_type const& key, T& data);
 
+    mutex_type&
+    peekMutex();
+
     std::vector<key_type>
     getKeys() const;
 
@@ -187,14 +193,11 @@ class TaggedCache
 
 private:
     SharedPointerType
-    initialFetch(key_type const& key);
+    initialFetch(key_type const& key, std::lock_guard<mutex_type> const& l);
 
     void
     collect_metrics();
 
-    Mutex&
-    lockPartition(key_type const& key) const;
-
 private:
     struct Stats
     {
@@ -297,8 +300,8 @@ class TaggedCache
         [[maybe_unused]] clock_type::time_point const& now,
         typename KeyValueCacheType::map_type& partition,
         SweptPointersVector& stuffToSweep,
-        std::atomic<int>& allRemoval,
-        Mutex& partitionLock);
+        std::atomic<int>& allRemovals,
+        std::lock_guard<std::recursive_mutex> const&);
 
     [[nodiscard]] std::thread
     sweepHelper(
@@ -307,12 +310,14 @@ class TaggedCache
         typename KeyOnlyCacheType::map_type& partition,
         SweptPointersVector&,
         std::atomic<int>& allRemovals,
-        Mutex& partitionLock);
+        std::lock_guard<std::recursive_mutex> const&);
 
     beast::Journal m_journal;
     clock_type& m_clock;
     Stats m_stats;
 
+    mutex_type mutable m_mutex;
+
     // Used for logging
     std::string m_name;
 
@@ -323,11 +328,10 @@ class TaggedCache
     clock_type::duration const m_target_age;
 
     // Number of items cached
-    std::atomic<int> m_cache_count;
+    int m_cache_count;
     cache_type m_cache;  // Hold strong reference to recent objects
-    std::atomic<std::uint64_t> m_hits;
-    std::atomic<std::uint64_t> m_misses;
-    mutable std::vector<mutex_type> partitionLocks_;
+    std::uint64_t m_hits;
+    std::uint64_t m_misses;
 };
 
 }  // namespace ripple