When loading library asset set, only store an asset if it's different from an existing one with the same id.

We compare existing and loaded asset by doing an SHA1 on both, so that a changed library asset will still update the store.
This cuts asset library load time from 10 seconds to <1 sec.
Note, a fix on the previous commit revealed a bug where a library script cannot be copied except on the first login after a cache clear.
This is unrelated to this commit and needs to be fixed at some subsequent time.

1 files changed, 12 insertions, 3 deletions

diff --git a/OpenSim/Services/AssetService/AssetService.cs b/OpenSim/Services/AssetService/AssetService.cs
index 851b7b4..c7a259d 100644
--- a/OpenSim/Services/AssetService/AssetService.cs
+++ b/OpenSim/Services/AssetService/AssetService.cs
@@ -84,11 +84,20 @@ namespace OpenSim.Services.AssetService
                     if (assetLoaderEnabled)
                     {
                         m_log.InfoFormat("[ASSET]: Loading default asset set from {0}", loaderArgs);
-                        m_AssetLoader.ForEachDefaultXmlAsset(loaderArgs,
-                                delegate(AssetBase a)
+
+                        m_AssetLoader.ForEachDefaultXmlAsset(
+                            loaderArgs,
+                            delegate(AssetBase a)
+                            {
+                                AssetBase existingAsset = Get(a.ID);
+//                                AssetMetadata existingMetadata = GetMetadata(a.ID);
+
+                                if (existingAsset == null || Util.SHA1Hash(existingAsset.Data) != Util.SHA1Hash(a.Data))
                                 {
+//                                    m_log.DebugFormat("[ASSET]: Storing {0} {1}", a.Name, a.ID);
                                     Store(a);
-                                });
+                                }
+                            });
                     }
 
                     m_log.Info("[ASSET SERVICE]: Local asset service enabled");