Mantis#1411. Thank you kindly for Dataserver.cs and a patch

that adds function stub to request region info by name and
adds llRequestSimulatorData() and the dataserver event

OpenSim/Region/ScriptEngine/Common/ScriptEngineBase/AsyncCommandPlugins/Dataserver.cs

@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSim Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using libsecondlife;
+
+namespace OpenSim.Region.ScriptEngine.Common.ScriptEngineBase.AsyncCommandPlugins
+
+{
+    public class Dataserver
+    {
+        public AsyncCommandManager m_CmdManager;
+
+        private Dictionary<string, DataserverRequest> DataserverRequests =
+                new Dictionary<string, DataserverRequest>();
+
+        public Dataserver(AsyncCommandManager CmdManager)
+        {
+            m_CmdManager = CmdManager;
+        }
+
+        private class DataserverRequest
+        {
+            public uint localID;
+            public LLUUID itemID;
+
+            public LLUUID ID;
+            public string handle;
+
+            public DateTime startTime;
+        }
+
+        public LLUUID RegisterRequest(uint localID, LLUUID itemID,
+                string identifier)
+        {
+            lock(DataserverRequests)
+            {
+                if(DataserverRequests.ContainsKey(identifier))
+                    return LLUUID.Zero;
+
+                DataserverRequest ds = new DataserverRequest();
+
+                ds.localID = localID;
+                ds.itemID = itemID;
+
+                ds.ID = LLUUID.Random();
+                ds.handle = identifier;
+
+                ds.startTime = DateTime.Now;
+
+                DataserverRequests[identifier]=ds;
+
+                return ds.ID;
+            }
+        }
+
+        public void DataserverReply(string identifier, string reply)
+        {
+            DataserverRequest ds;
+
+            lock(DataserverRequests)
+            {
+                if(!DataserverRequests.ContainsKey(identifier))
+                    return;
+                
+                ds=DataserverRequests[identifier];
+                DataserverRequests.Remove(identifier);
+            }
+
+            m_CmdManager.m_ScriptEngine.m_EventQueueManager.AddToObjectQueue(
+                    ds.localID, "dataserver", EventQueueManager.llDetectNull,
+                    new Object[] { new LSL_Types.LSLString(ds.ID.ToString()),
+                    new LSL_Types.LSLString(reply)});
+        }
+
+        public void RemoveEvents(uint localID, LLUUID itemID)
+        {
+            lock(DataserverRequests)
+            {
+                foreach (DataserverRequest ds in new List<DataserverRequest>(DataserverRequests.Values))
+                {
+                    if(ds.itemID == itemID)
+                        DataserverRequests.Remove(ds.handle);
+                }
+            }
+        }
+
+        public void ExpireRequests()
+        {
+            lock(DataserverRequests)
+            {
+                foreach (DataserverRequest ds in new List<DataserverRequest>(DataserverRequests.Values))
+                {
+                    if(ds.startTime > DateTime.Now.AddSeconds(30))
+                        DataserverRequests.Remove(ds.handle);
+                }
+            }
+        }
+    }
+}