Daily + GLPriceCache optimizations

MarketData/MarketDataLib/Cache/GLPriceCache.cs

@@ -17,9 +17,25 @@ namespace MarketData.Cache
     private static GLPriceCache instance = null;
     // -- Disposal -------------------------------------------------------------
     private volatile bool disposed = false;
-
     private int refreshInProgress = 0;    
 
+    // -- State ----------------------------------------------------------------
+    private readonly Dictionary<string, PricesByDate> priceCache = new Dictionary<string, PricesByDate>();
+    private readonly ConcurrentDictionary<string, object> symbolFetchLocks = new ConcurrentDictionary<string, object>();
+    private readonly object cacheLock = new object();
+    private DateTime latestDate = Utility.Epoch;
+
+    // -- Background refresh ---------------------------------------------------
+    private readonly TimeSpan cacheCycle = TimeSpan.FromMinutes(5);
+    private Timer refreshTimer = null;
+    private int tickCount = 0;
+//    private const int evictionTickInterval = 12; // every 12 ticks x 5 min = 1 hour
+    private const int evictionTickInterval = 144; // every 144 ticks x 5 min interval length = 12 hour.  (144 intervals *5 minutes )/60 minutes = 12 hours
+
+    // -- Parallelism ----------------------------------------------------------
+    private static readonly int maxParallelDbCalls = ResolveMaxParallelDbCalls();
+
+
     /// <summary>
     /// 
     /// </summary>
@@ -33,21 +49,6 @@ namespace MarketData.Cache
       }
     }
 
-    // -- State ----------------------------------------------------------------
-    private readonly Dictionary<string, PricesByDate> priceCache = new Dictionary<string, PricesByDate>();
-    private readonly ConcurrentDictionary<string, object> symbolFetchLocks = new ConcurrentDictionary<string, object>();
-    private readonly object cacheLock = new object();
-    private DateTime latestDate = Utility.Epoch;
-
-    // -- Background refresh ---------------------------------------------------
-    private readonly TimeSpan cacheCycle = TimeSpan.FromMinutes(5);
-    private Timer refreshTimer = null;
-    private int tickCount = 0;
-    private const int evictionTickInterval = 12; // every 12 ticks x 5 min = 1 hour
-
-    // -- Parallelism ----------------------------------------------------------
-    private static readonly int maxParallelDbCalls = ResolveMaxParallelDbCalls();
-
     private static int ResolveMaxParallelDbCalls()
     {
       return Math.Min(Math.Max(1, Environment.ProcessorCount) * 3, 32);