OpenSim-Test/OpenSim/Framework/Statistics/AssetStatsCollector.cs

/*
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 *       derived from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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 */

using System;
using System.Timers;

namespace OpenSim.Framework.Statistics
{
    /// <summary>
    /// Asset service statistics collection
    /// </summary>
    public class AssetStatsCollector : IStatsCollector
    {
        private Timer ageStatsTimer = new Timer(24 * 60 * 60 * 1000);
        private DateTime startTime = DateTime.Now;

        private long assetRequestsToday;
        private long assetRequestsNotFoundToday;
        private long assetRequestsYesterday;
        private long assetRequestsNotFoundYesterday;

        public long AssetRequestsToday { get { return assetRequestsToday; } }
        public long AssetRequestsNotFoundToday { get { return assetRequestsNotFoundToday; } }
        public long AssetRequestsYesterday { get { return assetRequestsYesterday; } }
        public long AssetRequestsNotFoundYesterday { get { return assetRequestsNotFoundYesterday; } }

        public AssetStatsCollector()
        {
            ageStatsTimer.Elapsed += new ElapsedEventHandler(OnAgeing);
            ageStatsTimer.Enabled = true;
        }

        private void OnAgeing(object source, ElapsedEventArgs e)
        {
            assetRequestsYesterday = assetRequestsToday;

            // There is a possibility that an asset request could occur between the execution of these
            // two statements.  But we're better off without the synchronization overhead.
            assetRequestsToday = 0;

            assetRequestsNotFoundYesterday = assetRequestsNotFoundToday;
            assetRequestsNotFoundToday = 0;
        }

        /// <summary>
        /// Record that an asset request failed to find an asset
        /// </summary>
        public void AddNotFoundRequest()
        {
            assetRequestsNotFoundToday++;
        }

        /// <summary>
        /// Record that a request was made to the asset server
        /// </summary>
        public void AddRequest()
        {
            assetRequestsToday++;
        }

        /// <summary>
        /// Report back collected statistical information.
        /// </summary>
        /// <returns></returns>
        public string Report()
        {
            double elapsedHours = (DateTime.Now - startTime).TotalHours;
            if (elapsedHours <= 0) { elapsedHours = 1; }  // prevent divide by zero

            long assetRequestsTodayPerHour = (long)Math.Round(AssetRequestsToday / elapsedHours);
            long assetRequestsYesterdayPerHour = (long)Math.Round(AssetRequestsYesterday / 24.0);

            return string.Format(
@"Asset requests today     : {0}  ({1} per hour)  of which {2} were not found
Asset requests yesterday : {3}  ({4} per hour)  of which {5} were not found",
                AssetRequestsToday, assetRequestsTodayPerHour, AssetRequestsNotFoundToday,
                AssetRequestsYesterday, assetRequestsYesterdayPerHour, AssetRequestsNotFoundYesterday);
        }
    }
}