Initial update to OpenSim 0.8.2.1 source code.

1 files changed, 290 insertions, 0 deletions

diff --git a/OpenSim/Framework/Monitoring/WorkManager.cs b/OpenSim/Framework/Monitoring/WorkManager.cs
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+++ b/OpenSim/Framework/Monitoring/WorkManager.cs
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+/*
+ * 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.Reflection;
+using System.Threading;
+using log4net;
+
+namespace OpenSim.Framework.Monitoring
+{
+    /// <summary>
+    /// Manages various work items in the simulator.
+    /// </summary>
+    /// <remarks>
+    /// Currently, here work can be started 
+    ///  * As a long-running and monitored thread.
+    ///  * In a thread that will never timeout but where the job is expected to eventually complete.
+    ///  * In a threadpool thread that will timeout if it takes a very long time to complete (> 10 mins).
+    ///  * As a job which will be run in a single-threaded job engine.  Such jobs must not incorporate delays (sleeps,
+    /// network waits, etc.).
+    /// 
+    /// This is an evolving approach to better manage the work that OpenSimulator is asked to do from a very diverse
+    /// range of sources (client actions, incoming network, outgoing network calls, etc.).
+    /// 
+    /// Util.FireAndForget is still available to insert jobs in the threadpool, though this is equivalent to
+    /// WorkManager.RunInThreadPool().
+    /// </remarks>
+    public static class WorkManager
+    {
+        private static readonly ILog m_log = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
+
+        public static JobEngine JobEngine { get; private set; }
+
+        static WorkManager()
+        {
+            JobEngine = new JobEngine("Non-blocking non-critical job engine", "JOB ENGINE");
+
+            StatsManager.RegisterStat(
+                new Stat(
+                    "JobsWaiting",
+                    "Number of jobs waiting for processing.",
+                    "",
+                    "",
+                    "server",
+                    "jobengine",
+                    StatType.Pull,
+                    MeasuresOfInterest.None,
+                    stat => stat.Value = JobEngine.JobsWaiting,
+                    StatVerbosity.Debug));
+
+            MainConsole.Instance.Commands.AddCommand(
+                "Debug",
+                false,
+                "debug jobengine",
+                "debug jobengine <start|stop|status|log>",
+                "Start, stop, get status or set logging level of the job engine.",
+                "If stopped then all outstanding jobs are processed immediately.",
+                HandleControlCommand);
+        }
+
+        /// <summary>
+        /// Start a new long-lived thread.
+        /// </summary>
+        /// <param name="start">The method that will be executed in a new thread</param>
+        /// <param name="name">A name to give to the new thread</param>
+        /// <param name="priority">Priority to run the thread at</param>
+        /// <param name="isBackground">True to run this thread as a background thread, otherwise false</param>
+        /// <param name="alarmIfTimeout">Trigger an alarm function is we have timed out</param>
+        /// <param name="log">If true then creation of thread is logged.</param>
+        /// <returns>The newly created Thread object</returns>
+        public static Thread StartThread(
+            ThreadStart start, string name, ThreadPriority priority, bool isBackground, bool alarmIfTimeout, bool log = true)
+        {
+            return StartThread(start, name, priority, isBackground, alarmIfTimeout, null, Watchdog.DEFAULT_WATCHDOG_TIMEOUT_MS, log);
+        }
+
+        /// <summary>
+        /// Start a new thread that is tracked by the watchdog
+        /// </summary>
+        /// <param name="start">The method that will be executed in a new thread</param>
+        /// <param name="name">A name to give to the new thread</param>
+        /// <param name="priority">Priority to run the thread at</param>
+        /// <param name="isBackground">True to run this thread as a background
+        /// thread, otherwise false</param>
+        /// <param name="alarmIfTimeout">Trigger an alarm function is we have timed out</param>
+        /// <param name="alarmMethod">
+        /// Alarm method to call if alarmIfTimeout is true and there is a timeout.
+        /// Normally, this will just return some useful debugging information.
+        /// </param>
+        /// <param name="timeout">Number of milliseconds to wait until we issue a warning about timeout.</param>
+        /// <param name="log">If true then creation of thread is logged.</param>
+        /// <returns>The newly created Thread object</returns>
+        public static Thread StartThread(
+            ThreadStart start, string name, ThreadPriority priority, bool isBackground,
+            bool alarmIfTimeout, Func<string> alarmMethod, int timeout, bool log = true)
+        {
+            Thread thread = new Thread(start);
+            thread.Priority = priority;
+            thread.IsBackground = isBackground;
+
+            Watchdog.ThreadWatchdogInfo twi
+                = new Watchdog.ThreadWatchdogInfo(thread, timeout, name)
+            { AlarmIfTimeout = alarmIfTimeout, AlarmMethod = alarmMethod };
+
+            Watchdog.AddThread(twi, name, log:log);
+
+            thread.Start();
+            thread.Name = name;
+
+            return thread;
+        }
+
+        /// <summary>
+        /// Run the callback in a new thread immediately.  If the thread exits with an exception log it but do
+        /// not propogate it.
+        /// </summary>
+        /// <param name="callback">Code for the thread to execute.</param>
+        /// <param name="obj">Object to pass to the thread.</param>
+        /// <param name="name">Name of the thread</param>
+        public static void RunInThread(WaitCallback callback, object obj, string name, bool log = false)
+        {
+            if (Util.FireAndForgetMethod == FireAndForgetMethod.RegressionTest)           
+            {
+                Culture.SetCurrentCulture();
+                callback(obj);
+                return;
+            }
+
+            ThreadStart ts = new ThreadStart(delegate()
+            {
+                try
+                {
+                    Culture.SetCurrentCulture();
+                    callback(obj);
+                    Watchdog.RemoveThread(log:false);
+                }
+                catch (Exception e)
+                {
+                    m_log.Error(string.Format("[WATCHDOG]: Exception in thread {0}.", name), e);
+                }
+            });
+
+            StartThread(ts, name, ThreadPriority.Normal, true, false, log:log);
+        }
+
+        /// <summary>
+        /// Run the callback via a threadpool thread. 
+        /// </summary>
+        /// <remarks>
+        /// Such jobs may run after some delay but must always complete.
+        /// </remarks>
+        /// <param name="callback"></param>
+        /// <param name="obj"></param>
+        /// <param name="name">The name of the job.  This is used in monitoring and debugging.</param>
+        public static void RunInThreadPool(System.Threading.WaitCallback callback, object obj, string name)
+        {
+            Util.FireAndForget(callback, obj, name);
+        }
+
+        /// <summary>
+        /// Run a job.
+        /// </summary>
+        /// <remarks>
+        /// This differs from direct scheduling (e.g. Util.FireAndForget) in that a job can be run in the job
+        /// engine if it is running, where all jobs are currently performed in sequence on a single thread.  This is
+        /// to prevent observed overload and server freeze problems when there are hundreds of connections which all attempt to 
+        /// perform work at once (e.g. in conference situations).  With lower numbers of connections, the small
+        /// delay in performing jobs in sequence rather than concurrently has not been notiecable in testing, though a future more 
+        /// sophisticated implementation could perform jobs concurrently when the server is under low load.
+        /// 
+        /// However, be advised that some callers of this function rely on all jobs being performed in sequence if any
+        /// jobs are performed in sequence (i.e. if jobengine is active or not).  Therefore, expanding the jobengine
+        /// beyond a single thread will require considerable thought.
+        /// 
+        /// Also, any jobs submitted must be guaranteed to complete within a reasonable timeframe (e.g. they cannot
+        /// incorporate a network delay with a long timeout).  At the moment, work that could suffer such issues 
+        /// should still be run directly with RunInThread(), Util.FireAndForget(), etc.  This is another area where
+        /// the job engine could be improved and so CPU utilization improved by better management of concurrency within
+        /// OpenSimulator.
+        /// </remarks>
+        /// <param name="jobType">General classification for the job (e.g. "RezAttachments").</param>
+        /// <param name="callback">Callback for job.</param>
+        /// <param name="obj">Object to pass to callback when run</param>
+        /// <param name="name">Specific name of job (e.g. "RezAttachments for Joe Bloggs"</param>
+        /// <param name="canRunInThisThread">If set to true then the job may be run in ths calling thread.</param>
+        /// <param name="mustNotTimeout">If the true then the job must never timeout.</param>
+        /// <param name="log">If set to true then extra logging is performed.</param>
+        public static void RunJob(
+            string jobType, WaitCallback callback, object obj, string name,
+            bool canRunInThisThread = false, bool mustNotTimeout = false, 
+            bool log = false)
+        {
+            if (Util.FireAndForgetMethod == FireAndForgetMethod.RegressionTest)           
+            {
+                Culture.SetCurrentCulture();
+                callback(obj);
+                return;
+            }
+
+            if (JobEngine.IsRunning)
+                JobEngine.QueueJob(name, () => callback(obj));
+            else if (canRunInThisThread)
+                callback(obj);
+            else if (mustNotTimeout)
+                RunInThread(callback, obj, name, log);
+            else
+                Util.FireAndForget(callback, obj, name);
+        }
+
+        private static void HandleControlCommand(string module, string[] args)
+        {
+            //            if (SceneManager.Instance.CurrentScene != null && SceneManager.Instance.CurrentScene != m_udpServer.Scene)
+            //                return;
+
+            if (args.Length < 3)
+            {
+                MainConsole.Instance.Output("Usage: debug jobengine <stop|start|status|log>");
+                return;
+            }
+
+            string subCommand = args[2];
+
+            if (subCommand == "stop")
+            {
+                JobEngine.Stop();
+                MainConsole.Instance.OutputFormat("Stopped job engine.");
+            }
+            else if (subCommand == "start")
+            {
+                JobEngine.Start();
+                MainConsole.Instance.OutputFormat("Started job engine.");
+            }
+            else if (subCommand == "status")
+            {
+                MainConsole.Instance.OutputFormat("Job engine running: {0}", JobEngine.IsRunning);
+
+                JobEngine.Job job = JobEngine.CurrentJob;
+                MainConsole.Instance.OutputFormat("Current job {0}", job != null ? job.Name : "none");
+
+                MainConsole.Instance.OutputFormat(
+                    "Jobs waiting: {0}", JobEngine.IsRunning ? JobEngine.JobsWaiting.ToString() : "n/a");
+                MainConsole.Instance.OutputFormat("Log Level: {0}", JobEngine.LogLevel);
+            }
+            else if (subCommand == "log")
+            {
+                if (args.Length < 4)
+                {
+                    MainConsole.Instance.Output("Usage: debug jobengine log <level>");
+                    return;
+                }
+                
+                //                int logLevel;
+                int logLevel = int.Parse(args[3]);
+                //                if (ConsoleUtil.TryParseConsoleInt(MainConsole.Instance, args[4], out logLevel))
+                //                {                 
+                JobEngine.LogLevel = logLevel;
+                MainConsole.Instance.OutputFormat("Set debug log level to {0}", JobEngine.LogLevel);
+                //                }
+            }
+            else 
+            {
+                MainConsole.Instance.OutputFormat("Unrecognized job engine subcommand {0}", subCommand);
+            }
+        }
+    }
+}
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