refactor: Move stat classes out of StatManager and into their own files for clarity.

2 files changed, 326 insertions, 0 deletions

diff --git a/OpenSim/Framework/Monitoring/Stats/PercentageStat.cs b/OpenSim/Framework/Monitoring/Stats/PercentageStat.cs
new file mode 100644
index 0000000..60bed55
--- /dev/null
+++ b/OpenSim/Framework/Monitoring/Stats/PercentageStat.cs
@@ -0,0 +1,88 @@
+/*
+ * 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 OpenSimulator 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.Generic;
+using System.Text;
+
+namespace OpenSim.Framework.Monitoring
+{
+    public class PercentageStat : Stat
+    {
+        public long Antecedent { get; set; }
+        public long Consequent { get; set; }
+
+        public override double Value
+        {
+            get
+            {
+                // Asking for an update here means that the updater cannot access this value without infinite recursion.
+                // XXX: A slightly messy but simple solution may be to flick a flag so we can tell if this is being
+                // called by the pull action and just return the value.
+                if (StatType == StatType.Pull)
+                    PullAction(this);
+
+                long c = Consequent;
+
+                // Avoid any chance of a multi-threaded divide-by-zero
+                if (c == 0)
+                    return 0;
+
+                return (double)Antecedent / c * 100;
+            }
+
+            set
+            {
+                throw new InvalidOperationException("Cannot set value on a PercentageStat");
+            }
+        }
+
+        public PercentageStat(
+            string shortName,
+            string name,
+            string description,
+            string category,
+            string container,
+            StatType type,
+            Action<Stat> pullAction,
+            StatVerbosity verbosity)
+            : base(shortName, name, description, "%", category, container, type, pullAction, verbosity) {}
+
+        public override string ToConsoleString()
+        {
+            StringBuilder sb = new StringBuilder();
+
+            sb.AppendFormat(
+                "{0}.{1}.{2} : {3:0.##}{4} ({5}/{6})",
+                Category, Container, ShortName, Value, UnitName, Antecedent, Consequent);
+
+            AppendMeasuresOfInterest(sb);
+
+            return sb.ToString();
+        }
+    }
+}
\ No newline at end of file
diff --git a/OpenSim/Framework/Monitoring/Stats/Stat.cs b/OpenSim/Framework/Monitoring/Stats/Stat.cs
new file mode 100644
index 0000000..f91251b
--- /dev/null
+++ b/OpenSim/Framework/Monitoring/Stats/Stat.cs
@@ -0,0 +1,238 @@
+/*
+ * 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 OpenSimulator 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.Generic;
+using System.Text;
+
+namespace OpenSim.Framework.Monitoring
+{
+    /// <summary>
+    /// Holds individual statistic details
+    /// </summary>
+    public class Stat
+    {
+        /// <summary>
+        /// Category of this stat (e.g. cache, scene, etc).
+        /// </summary>
+        public string Category { get; private set; }
+
+        /// <summary>
+        /// Containing name for this stat.
+        /// FIXME: In the case of a scene, this is currently the scene name (though this leaves
+        /// us with a to-be-resolved problem of non-unique region names).
+        /// </summary>
+        /// <value>
+        /// The container.
+        /// </value>
+        public string Container { get; private set; }
+
+        public StatType StatType { get; private set; }
+
+        public MeasuresOfInterest MeasuresOfInterest { get; private set; }
+
+        /// <summary>
+        /// Action used to update this stat when the value is requested if it's a pull type.
+        /// </summary>
+        public Action<Stat> PullAction { get; private set; }
+
+        public StatVerbosity Verbosity { get; private set; }
+        public string ShortName { get; private set; }
+        public string Name { get; private set; }
+        public string Description { get; private set; }
+        public virtual string UnitName { get; private set; }
+
+        public virtual double Value
+        {
+            get
+            {
+                // Asking for an update here means that the updater cannot access this value without infinite recursion.
+                // XXX: A slightly messy but simple solution may be to flick a flag so we can tell if this is being
+                // called by the pull action and just return the value.
+                if (StatType == StatType.Pull)
+                    PullAction(this);
+
+                return m_value;
+            }
+
+            set
+            {
+                m_value = value;
+            }
+        }
+
+        private double m_value;
+
+        /// <summary>
+        /// Historical samples for calculating measures of interest average.
+        /// </summary>
+        /// <remarks>
+        /// Will be null if no measures of interest require samples.
+        /// </remarks>
+        private static Queue<double> m_samples;
+
+        /// <summary>
+        /// Maximum number of statistical samples.
+        /// </summary>
+        /// <remarks>
+        /// At the moment this corresponds to 1 minute since the sampling rate is every 2.5 seconds as triggered from
+        /// the main Watchdog.
+        /// </remarks>
+        private static int m_maxSamples = 24;
+
+        public Stat(
+            string shortName,
+            string name,
+            string description,
+            string unitName,
+            string category,
+            string container,
+            StatType type,
+            Action<Stat> pullAction,
+            StatVerbosity verbosity) 
+                : this(
+                    shortName, 
+                    name, 
+                    description, 
+                    unitName, 
+                    category, 
+                    container, 
+                    type, 
+                    MeasuresOfInterest.None, 
+                    pullAction, 
+                    verbosity)
+        {
+        }
+
+        /// <summary>
+        /// Constructor
+        /// </summary>
+        /// <param name='shortName'>Short name for the stat.  Must not contain spaces.  e.g. "LongFrames"</param>
+        /// <param name='name'>Human readable name for the stat.  e.g. "Long frames"</param>
+        /// <param name='description'>Description of stat</param>
+        /// <param name='unitName'>
+        /// Unit name for the stat.  Should be preceeded by a space if the unit name isn't normally appeneded immediately to the value.
+        /// e.g. " frames"
+        /// </param>
+        /// <param name='category'>Category under which this stat should appear, e.g. "scene".  Do not capitalize.</param>
+        /// <param name='container'>Entity to which this stat relates.  e.g. scene name if this is a per scene stat.</param>
+        /// <param name='type'>Push or pull</param>
+        /// <param name='pullAction'>Pull stats need an action to update the stat on request.  Push stats should set null here.</param>
+        /// <param name='moi'>Measures of interest</param>
+        /// <param name='verbosity'>Verbosity of stat.  Controls whether it will appear in short stat display or only full display.</param>
+        public Stat(
+            string shortName,
+            string name,
+            string description,
+            string unitName,
+            string category,
+            string container,
+            StatType type,
+            MeasuresOfInterest moi,
+            Action<Stat> pullAction,
+            StatVerbosity verbosity)
+        {
+            if (StatsManager.SubCommands.Contains(category))
+                throw new Exception(
+                    string.Format("Stat cannot be in category '{0}' since this is reserved for a subcommand", category));
+
+            ShortName = shortName;
+            Name = name;
+            Description = description;
+            UnitName = unitName;
+            Category = category;
+            Container = container;
+            StatType = type;
+
+            if (StatType == StatType.Push && pullAction != null)
+                throw new Exception("A push stat cannot have a pull action");
+            else
+                PullAction = pullAction;
+
+            MeasuresOfInterest = moi;
+
+            if ((moi & MeasuresOfInterest.AverageChangeOverTime) == MeasuresOfInterest.AverageChangeOverTime)
+                m_samples = new Queue<double>(m_maxSamples);
+
+            Verbosity = verbosity;
+        }
+
+        /// <summary>
+        /// Record a value in the sample set.
+        /// </summary>
+        /// <remarks>
+        /// Do not call this if MeasuresOfInterest.None
+        /// </remarks>
+        public void RecordValue()
+        {
+            double newValue = Value;
+
+            lock (m_samples)
+            {
+                if (m_samples.Count >= m_maxSamples)
+                    m_samples.Dequeue();
+
+                m_samples.Enqueue(newValue);
+            }
+        }
+
+        public virtual string ToConsoleString()
+        {
+            StringBuilder sb = new StringBuilder();
+            sb.AppendFormat("{0}.{1}.{2} : {3}{4}", Category, Container, ShortName, Value, UnitName);
+
+            AppendMeasuresOfInterest(sb);
+
+            return sb.ToString();
+        }
+
+        protected void AppendMeasuresOfInterest(StringBuilder sb)
+        {
+            if ((MeasuresOfInterest & MeasuresOfInterest.AverageChangeOverTime) 
+                == MeasuresOfInterest.AverageChangeOverTime)
+            {
+                double totalChange = 0;
+                double? lastSample = null;
+
+                lock (m_samples)
+                {
+                    foreach (double s in m_samples)
+                    {
+                        if (lastSample != null)
+                            totalChange += s - (double)lastSample;
+
+                        lastSample = s;
+                    }
+                }
+
+                int divisor = m_samples.Count <= 1 ? 1 : m_samples.Count - 1;
+
+                sb.AppendFormat(", {0:0.##}{1}/s", totalChange / divisor / (Watchdog.WATCHDOG_INTERVAL_MS / 1000), UnitName);
+            }
+        }
+    }
+}
\ No newline at end of file