add mesh cache expire on region startup. Expires will be relative to

previus expire (assumed done only once at startup). File 'cntr' on cache
 folder stores time. Deleting it will force a skip on expire. Default time
 is 48hours before previus startup to account for failed ones etc.

OpenSim/Region/Physics/Manager/IMesher.cs

@@ -41,6 +41,7 @@ namespace OpenSim.Region.Physics.Manager
         IMesh GetMesh(String primName, PrimitiveBaseShape primShape, Vector3 size, float lod, bool isPhysical, bool convex);
         void ReleaseMesh(IMesh mesh);
         void ExpireReleaseMeshs();
+        void ExpireFileCache();
     }
 
     // Values for level of detail to be passed to the mesher.

OpenSim/Region/Physics/Manager/ZeroMesher.cs

@@ -87,5 +87,6 @@ namespace OpenSim.Region.Physics.Manager
 
         public void ReleaseMesh(IMesh mesh) { }
         public void ExpireReleaseMeshs() { }
+        public void ExpireFileCache() { }
     }
 }

OpenSim/Region/Physics/Meshing/Meshmerizer.cs

@@ -755,5 +755,6 @@ namespace OpenSim.Region.Physics.Meshing
 
         public void ReleaseMesh(IMesh imesh) { }
         public void ExpireReleaseMeshs() { }
+        public void ExpireFileCache() { }
     }
 }

OpenSim/Region/Physics/UbitMeshing/Meshmerizer.cs

@@ -76,6 +76,8 @@ namespace OpenSim.Region.Physics.Meshing
         public bool doMeshFileCache = true;
 
         public string cachePath = "MeshCache";
+        public TimeSpan CacheExpire;
+        public bool doCacheExpire = true;
 
 //        const string baseDir = "rawFiles";
         private const string baseDir = null; //"rawFiles";
@@ -92,19 +94,31 @@ namespace OpenSim.Region.Physics.Meshing
             IConfig start_config = config.Configs["Startup"];
             IConfig mesh_config = config.Configs["Mesh"];
 
+
+            float fcache = 48.0f;
+//            float fcache = 0.02f;
+
             if(mesh_config != null)
             {
                 useMeshiesPhysicsMesh = mesh_config.GetBoolean("UseMeshiesPhysicsMesh", useMeshiesPhysicsMesh);
-                if(useMeshiesPhysicsMesh)
+                if (useMeshiesPhysicsMesh)
                 {
                     doMeshFileCache = mesh_config.GetBoolean("MeshFileCache", doMeshFileCache);
                     cachePath = mesh_config.GetString("MeshFileCachePath", cachePath);
+                    fcache = mesh_config.GetFloat("MeshFileCacheExpireHours", fcache);
+                    doCacheExpire = mesh_config.GetBoolean("MeshFileCacheDoExpire", doCacheExpire);
                 }
                 else
+                {
                     doMeshFileCache = false;
+                    doCacheExpire = false;
                 }
             }
 
+            CacheExpire = TimeSpan.FromHours(fcache);
+
+        }
+
         /// <summary>
         /// creates a simple box mesh of the specified size. This mesh is of very low vertex count and may
         /// be useful as a backup proxy when level of detail is not needed or when more complex meshes fail
@@ -1273,6 +1287,7 @@ namespace OpenSim.Region.Physics.Meshing
                         BinaryFormatter bformatter = new BinaryFormatter();
 
                         mesh = Mesh.FromStream(stream, key);
+                        
                     }
                     catch (Exception e)
                     {
@@ -1281,11 +1296,14 @@ namespace OpenSim.Region.Physics.Meshing
                             "[MESH CACHE]: Failed to get file {0}.  Exception {1} {2}",
                             filename, e.Message, e.StackTrace);
                     }
+
                     if (stream != null)
                         stream.Close();
 
                     if (mesh == null || !ok)
                         File.Delete(filename);
+                    else
+                        File.SetLastAccessTimeUtc(filename, DateTime.UtcNow);
                 }
             }
 
@@ -1326,9 +1344,73 @@ namespace OpenSim.Region.Physics.Meshing
                 if (stream != null)
                     stream.Close();
 
-                if (!ok && File.Exists(filename))
+                if (File.Exists(filename))
+                {
+                    if (ok)
+                        File.SetLastAccessTimeUtc(filename, DateTime.UtcNow);
+                    else
                         File.Delete(filename);
                 }
             }
         }
+        
+        public void ExpireFileCache()
+        {
+            if (!doCacheExpire)
+                return;
+
+            string controlfile = System.IO.Path.Combine(cachePath, "cntr");
+
+            lock (diskLock)
+            {
+                try
+                {
+                    if (File.Exists(controlfile))
+                    {
+                        int ndeleted = 0;
+                        int totalfiles = 0;
+                        int ndirs = 0;
+                        DateTime OlderTime = File.GetLastAccessTimeUtc(controlfile) - CacheExpire;
+                        File.SetLastAccessTimeUtc(controlfile, DateTime.UtcNow);
+                        
+                        foreach (string dir in Directory.GetDirectories(cachePath))                       
+                        {
+                            try
+                            {
+                                foreach (string file in Directory.GetFiles(dir))
+                                {
+                                    try
+                                    {
+                                        if (File.GetLastAccessTimeUtc(file) < OlderTime)
+                                        {
+                                            File.Delete(file);
+                                            ndeleted++;
+                                        }
+                                    }
+                                    catch { }
+                                    totalfiles++;
+                                }
+                            }
+                            catch { }
+                            ndirs++;
+                        }
+
+                        if (ndeleted == 0)
+                            m_log.InfoFormat("[MESH CACHE]: {0} Files in {1} cache folders, no expires",
+                                totalfiles,ndirs);
+                        else
+                            m_log.InfoFormat("[MESH CACHE]: {0} Files in {1} cache folders, expired {2} files accessed before {3}",
+                                totalfiles,ndirs, ndeleted, OlderTime.ToString());
+                    }
+                    else
+                    {
+                        m_log.Info("[MESH CACHE]: Expire delayed to next startup");
+                        FileStream fs = File.Create(controlfile,4096,FileOptions.WriteThrough);
+                        fs.Close();
+                    }
+                }
+                catch { }
+            }
+        }
+    }
 }