add notecardcache

src/helper/NotecardCache.cs

@@ -0,0 +1,123 @@
+using OpenMetaverse;
+using OpenSim.Framework;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OpenSim.Modules.Appearance2Avatar.helper
+{
+    class NotecardCache
+    {
+        protected class Notecard
+        {
+            public string[] text;
+            public DateTime lastRef;
+        }
+
+        private static Dictionary<UUID, Notecard> m_Notecards =
+            new Dictionary<UUID, Notecard>();
+
+        public static void Cache(UUID assetID, byte[] text)
+        {
+            CheckCache();
+
+            lock (m_Notecards)
+            {
+                if (m_Notecards.ContainsKey(assetID))
+                    return;
+
+                Notecard nc = new Notecard();
+                nc.lastRef = DateTime.Now;
+                nc.text = SLUtil.ParseNotecardToArray(text);
+                m_Notecards[assetID] = nc;
+            }
+        }
+
+        public static bool IsCached(UUID assetID)
+        {
+            lock (m_Notecards)
+            {
+                return m_Notecards.ContainsKey(assetID);
+            }
+        }
+
+        public static int GetLines(UUID assetID)
+        {
+            if (!IsCached(assetID))
+                return -1;
+
+            lock (m_Notecards)
+            {
+                m_Notecards[assetID].lastRef = DateTime.Now;
+                return m_Notecards[assetID].text.Length;
+            }
+        }
+
+        /// <summary>
+        /// Get a notecard line.
+        /// </summary>
+        /// <param name="assetID"></param>
+        /// <param name="lineNumber">Lines start at index 0</param>
+        /// <returns></returns>
+        public static string GetLine(UUID assetID, int lineNumber)
+        {
+            if (lineNumber < 0)
+                return "";
+
+            string data;
+
+            if (!IsCached(assetID))
+                return "";
+
+            lock (m_Notecards)
+            {
+                m_Notecards[assetID].lastRef = DateTime.Now;
+
+                if (lineNumber >= m_Notecards[assetID].text.Length)
+                    return "\n\n\n";
+
+                data = m_Notecards[assetID].text[lineNumber];
+
+                return data;
+            }
+        }
+
+        /// <summary>
+        /// Get a notecard line.
+        /// </summary>
+        /// <param name="assetID"></param>
+        /// <param name="lineNumber">Lines start at index 0</param>
+        /// <param name="maxLength">
+        /// Maximum length of the returned line.
+        /// </param>
+        /// <returns>
+        /// If the line length is longer than <paramref name="maxLength"/>,
+        /// the return string will be truncated.
+        /// </returns>
+        public static string GetLine(UUID assetID, int lineNumber, int maxLength)
+        {
+            string line = GetLine(assetID, lineNumber);
+
+            if (line.Length > maxLength)
+                line = line.Substring(0, maxLength);
+
+            return line;
+        }
+
+        public static void CheckCache()
+        {
+            lock (m_Notecards)
+            {
+                foreach (UUID key in new List<UUID>(m_Notecards.Keys))
+                {
+                    Notecard nc = m_Notecards[key];
+                    if (nc.lastRef.AddSeconds(30) < DateTime.Now)
+                        m_Notecards.Remove(key);
+                }
+            }
+        }
+
+    }
+}