From d1c3f8eef58b29eb8760eeb1ac03852a2387f927 Mon Sep 17 00:00:00 2001
From: Oren Hurvitz
Date: Mon, 31 Mar 2014 11:53:12 +0300
Subject: Added assets service method AssetsExist(), which returns whether the
 given list of assets exist.

This method is used to optimize sending assets with embedded assets: e.g., when a Hypergrid visitor takes an item into the inventory.
---
 OpenSim/Data/SQLite/SQLiteAssetData.cs | 37 ++++++++++++++++++++--------------
 1 file changed, 22 insertions(+), 15 deletions(-)

(limited to 'OpenSim/Data/SQLite/SQLiteAssetData.cs')

diff --git a/OpenSim/Data/SQLite/SQLiteAssetData.cs b/OpenSim/Data/SQLite/SQLiteAssetData.cs
index c32982e..1f32376 100644
--- a/OpenSim/Data/SQLite/SQLiteAssetData.cs
+++ b/OpenSim/Data/SQLite/SQLiteAssetData.cs
@@ -152,7 +152,7 @@ namespace OpenSim.Data.SQLite
             }
 
             //m_log.Info("[ASSET DB]: Creating Asset " + asset.FullID.ToString());
-            if (ExistsAsset(asset.FullID))
+            if (AssetsExist(new[] { asset.FullID })[0])
             {
                 //LogAssetLoad(asset);
 
@@ -214,32 +214,39 @@ namespace OpenSim.Data.SQLite
 //        }
 
         /// <summary>
-        /// Check if an asset exist in database
+        /// Check if the assets exist in the database.
         /// </summary>
-        /// <param name="uuid">The asset UUID</param>
-        /// <returns>True if exist, or false.</returns>
-        override public bool ExistsAsset(UUID uuid)
+        /// <param name="uuids">The assets' IDs</param>
+        /// <returns>For each asset: true if it exists, false otherwise</returns>
+        public override bool[] AssetsExist(UUID[] uuids)
         {
-            lock (this) 
+            if (uuids.Length == 0)
+                return new bool[0];
+
+            HashSet<UUID> exist = new HashSet<UUID>();
+
+            string ids = "'" + string.Join("','", uuids) + "'";
+            string sql = string.Format("SELECT id FROM assets WHERE id IN ({0})", ids);
+
+            lock (this)
             {
                 using (SqliteCommand cmd = new SqliteCommand(SelectAssetSQL, m_conn))
                 {
-                    cmd.Parameters.Add(new SqliteParameter(":UUID", uuid.ToString()));
                     using (IDataReader reader = cmd.ExecuteReader())
                     {
-                        if (reader.Read())
-                        {
-                            reader.Close();
-                            return true;
-                        }
-                        else
+                        while (reader.Read())
                         {
-                            reader.Close();
-                            return false;
+                            UUID id = new UUID((string)reader["UUID"]);
+                            exist.Add(id);
                         }
                     }
                 }
             }
+
+            bool[] results = new bool[uuids.Length];
+            for (int i = 0; i < uuids.Length; i++)
+                results[i] = exist.Contains(uuids[i]);
+            return results;
         }
 
         /// <summary>
-- 
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