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1 eva 1 /*
2 * Copyright (c) Contributors, http://opensimulator.org/
3 * See CONTRIBUTORS.TXT for a full list of copyright holders.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of the OpenSimulator Project nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27  
28 using System;
29 using System.Collections.Generic;
30 using System.Linq;
31 using System.Reflection;
32 using System.Text;
33 using log4net;
34 using OpenMetaverse.StructuredData;
35  
36 namespace OpenSim.Framework.Monitoring
37 {
38 /// <summary>
39 /// Holds individual statistic details
40 /// </summary>
41 public class Stat : IDisposable
42 {
43 // private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
44  
45 public static readonly char[] DisallowedShortNameCharacters = { '.' };
46  
47 /// <summary>
48 /// Category of this stat (e.g. cache, scene, etc).
49 /// </summary>
50 public string Category { get; private set; }
51  
52 /// <summary>
53 /// Containing name for this stat.
54 /// FIXME: In the case of a scene, this is currently the scene name (though this leaves
55 /// us with a to-be-resolved problem of non-unique region names).
56 /// </summary>
57 /// <value>
58 /// The container.
59 /// </value>
60 public string Container { get; private set; }
61  
62 public StatType StatType { get; private set; }
63  
64 public MeasuresOfInterest MeasuresOfInterest { get; private set; }
65  
66 /// <summary>
67 /// Action used to update this stat when the value is requested if it's a pull type.
68 /// </summary>
69 public Action<Stat> PullAction { get; private set; }
70  
71 public StatVerbosity Verbosity { get; private set; }
72 public string ShortName { get; private set; }
73 public string Name { get; private set; }
74 public string Description { get; private set; }
75 public virtual string UnitName { get; private set; }
76  
77 public virtual double Value
78 {
79 get
80 {
81 // Asking for an update here means that the updater cannot access this value without infinite recursion.
82 // XXX: A slightly messy but simple solution may be to flick a flag so we can tell if this is being
83 // called by the pull action and just return the value.
84 if (StatType == StatType.Pull)
85 PullAction(this);
86  
87 return m_value;
88 }
89  
90 set
91 {
92 m_value = value;
93 }
94 }
95  
96 private double m_value;
97  
98 /// <summary>
99 /// Historical samples for calculating measures of interest average.
100 /// </summary>
101 /// <remarks>
102 /// Will be null if no measures of interest require samples.
103 /// </remarks>
104 private Queue<double> m_samples;
105  
106 /// <summary>
107 /// Maximum number of statistical samples.
108 /// </summary>
109 /// <remarks>
110 /// At the moment this corresponds to 1 minute since the sampling rate is every 2.5 seconds as triggered from
111 /// the main Watchdog.
112 /// </remarks>
113 private static int m_maxSamples = 24;
114  
115 public Stat(
116 string shortName,
117 string name,
118 string description,
119 string unitName,
120 string category,
121 string container,
122 StatType type,
123 Action<Stat> pullAction,
124 StatVerbosity verbosity)
125 : this(
126 shortName,
127 name,
128 description,
129 unitName,
130 category,
131 container,
132 type,
133 MeasuresOfInterest.None,
134 pullAction,
135 verbosity)
136 {
137 }
138  
139 /// <summary>
140 /// Constructor
141 /// </summary>
142 /// <param name='shortName'>Short name for the stat. Must not contain spaces. e.g. "LongFrames"</param>
143 /// <param name='name'>Human readable name for the stat. e.g. "Long frames"</param>
144 /// <param name='description'>Description of stat</param>
145 /// <param name='unitName'>
146 /// Unit name for the stat. Should be preceeded by a space if the unit name isn't normally appeneded immediately to the value.
147 /// e.g. " frames"
148 /// </param>
149 /// <param name='category'>Category under which this stat should appear, e.g. "scene". Do not capitalize.</param>
150 /// <param name='container'>Entity to which this stat relates. e.g. scene name if this is a per scene stat.</param>
151 /// <param name='type'>Push or pull</param>
152 /// <param name='pullAction'>Pull stats need an action to update the stat on request. Push stats should set null here.</param>
153 /// <param name='moi'>Measures of interest</param>
154 /// <param name='verbosity'>Verbosity of stat. Controls whether it will appear in short stat display or only full display.</param>
155 public Stat(
156 string shortName,
157 string name,
158 string description,
159 string unitName,
160 string category,
161 string container,
162 StatType type,
163 MeasuresOfInterest moi,
164 Action<Stat> pullAction,
165 StatVerbosity verbosity)
166 {
167 if (StatsManager.SubCommands.Contains(category))
168 throw new Exception(
169 string.Format("Stat cannot be in category '{0}' since this is reserved for a subcommand", category));
170  
171 foreach (char c in DisallowedShortNameCharacters)
172 {
173 if (shortName.IndexOf(c) != -1)
174 throw new Exception(string.Format("Stat name {0} cannot contain character {1}", shortName, c));
175 }
176  
177 ShortName = shortName;
178 Name = name;
179 Description = description;
180 UnitName = unitName;
181 Category = category;
182 Container = container;
183 StatType = type;
184  
185 if (StatType == StatType.Push && pullAction != null)
186 throw new Exception("A push stat cannot have a pull action");
187 else
188 PullAction = pullAction;
189  
190 MeasuresOfInterest = moi;
191  
192 if ((moi & MeasuresOfInterest.AverageChangeOverTime) == MeasuresOfInterest.AverageChangeOverTime)
193 m_samples = new Queue<double>(m_maxSamples);
194  
195 Verbosity = verbosity;
196 }
197  
198 // IDisposable.Dispose()
199 public virtual void Dispose()
200 {
201 return;
202 }
203  
204 /// <summary>
205 /// Record a value in the sample set.
206 /// </summary>
207 /// <remarks>
208 /// Do not call this if MeasuresOfInterest.None
209 /// </remarks>
210 public void RecordValue()
211 {
212 double newValue = Value;
213  
214 lock (m_samples)
215 {
216 if (m_samples.Count >= m_maxSamples)
217 m_samples.Dequeue();
218  
219 // m_log.DebugFormat("[STAT]: Recording value {0} for {1}", newValue, Name);
220  
221 m_samples.Enqueue(newValue);
222 }
223 }
224  
225 public virtual string ToConsoleString()
226 {
227 StringBuilder sb = new StringBuilder();
228 sb.AppendFormat(
229 "{0}.{1}.{2} : {3}{4}",
230 Category,
231 Container,
232 ShortName,
233 Value,
234 string.IsNullOrEmpty(UnitName) ? "" : string.Format(" {0}", UnitName));
235  
236 AppendMeasuresOfInterest(sb);
237  
238 return sb.ToString();
239 }
240  
241 public virtual OSDMap ToOSDMap()
242 {
243 OSDMap ret = new OSDMap();
244 ret.Add("StatType", "Stat"); // used by overloading classes to denote type of stat
245  
246 ret.Add("Category", OSD.FromString(Category));
247 ret.Add("Container", OSD.FromString(Container));
248 ret.Add("ShortName", OSD.FromString(ShortName));
249 ret.Add("Name", OSD.FromString(Name));
250 ret.Add("Description", OSD.FromString(Description));
251 ret.Add("UnitName", OSD.FromString(UnitName));
252 ret.Add("Value", OSD.FromReal(Value));
253  
254 double lastChangeOverTime, averageChangeOverTime;
255 if (ComputeMeasuresOfInterest(out lastChangeOverTime, out averageChangeOverTime))
256 {
257 ret.Add("LastChangeOverTime", OSD.FromReal(lastChangeOverTime));
258 ret.Add("AverageChangeOverTime", OSD.FromReal(averageChangeOverTime));
259 }
260  
261 return ret;
262 }
263  
264 // Compute the averages over time and return same.
265 // Return 'true' if averages were actually computed. 'false' if no average info.
266 public bool ComputeMeasuresOfInterest(out double lastChangeOverTime, out double averageChangeOverTime)
267 {
268 bool ret = false;
269 lastChangeOverTime = 0;
270 averageChangeOverTime = 0;
271  
272 if ((MeasuresOfInterest & MeasuresOfInterest.AverageChangeOverTime) == MeasuresOfInterest.AverageChangeOverTime)
273 {
274 double totalChange = 0;
275 double? penultimateSample = null;
276 double? lastSample = null;
277  
278 lock (m_samples)
279 {
280 // m_log.DebugFormat(
281 // "[STAT]: Samples for {0} are {1}",
282 // Name, string.Join(",", m_samples.Select(s => s.ToString()).ToArray()));
283  
284 foreach (double s in m_samples)
285 {
286 if (lastSample != null)
287 totalChange += s - (double)lastSample;
288  
289 penultimateSample = lastSample;
290 lastSample = s;
291 }
292 }
293  
294 if (lastSample != null && penultimateSample != null)
295 {
296 lastChangeOverTime
297 = ((double)lastSample - (double)penultimateSample) / (Watchdog.WATCHDOG_INTERVAL_MS / 1000);
298 }
299  
300 int divisor = m_samples.Count <= 1 ? 1 : m_samples.Count - 1;
301  
302 averageChangeOverTime = totalChange / divisor / (Watchdog.WATCHDOG_INTERVAL_MS / 1000);
303 ret = true;
304 }
305  
306 return ret;
307 }
308  
309 protected void AppendMeasuresOfInterest(StringBuilder sb)
310 {
311 double lastChangeOverTime = 0;
312 double averageChangeOverTime = 0;
313  
314 if (ComputeMeasuresOfInterest(out lastChangeOverTime, out averageChangeOverTime))
315 {
316 sb.AppendFormat(
317 ", {0:0.##}{1}/s, {2:0.##}{3}/s",
318 lastChangeOverTime,
319 string.IsNullOrEmpty(UnitName) ? "" : string.Format(" {0}", UnitName),
320 averageChangeOverTime,
321 string.IsNullOrEmpty(UnitName) ? "" : string.Format(" {0}", UnitName));
322 }
323 }
324 }
325 }