Dataserver.cs

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 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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using System;
using System.Collections;
using System.Collections.Generic;
using OpenMetaverse;
using OpenSim.Region.ScriptEngine.Shared;
using OpenSim.Region.ScriptEngine.Shared.Api;

namespace OpenSim.Region.ScriptEngine.Shared.Api.Plugins
{
    public class Dataserver
    {
        public AsyncCommandManager m_CmdManager;

        public int DataserverRequestsCount
        {
            get
            {
                lock (DataserverRequests)
                    return DataserverRequests.Count;
            }
        }

        private Dictionary<string, DataserverRequest> DataserverRequests =
                new Dictionary<string, DataserverRequest>();

        public Dataserver(AsyncCommandManager CmdManager)
        {
            m_CmdManager = CmdManager;
        }

        private class DataserverRequest
        {
            public uint localID;
            public UUID itemID;

            public UUID ID;
            public string handle;

            public DateTime startTime;
        }

        public UUID RegisterRequest(uint localID, UUID itemID,
                                      string identifier)
        {
            lock (DataserverRequests)
            {
                if (DataserverRequests.ContainsKey(identifier))
                    return UUID.Zero;

                DataserverRequest ds = new DataserverRequest();

                ds.localID = localID;
                ds.itemID = itemID;

                ds.ID = UUID.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.PostObjectEvent(ds.localID,
                    new EventParams("dataserver", new Object[]
                            { new LSL_Types.LSLString(ds.ID.ToString()),
                            new LSL_Types.LSLString(reply)},
                    new DetectParams[0]));
        }

        public void RemoveEvents(uint localID, UUID 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);
                }
            }
        }
    }
}