aboutsummaryrefslogtreecommitdiffstatshomepage
path: root/OpenSim/Region/ScriptEngine/Common/ScriptEngineBase/MaintenanceThread.cs
blob: ab4ea04914aae3094eb0b10eb86f1b9c6aa195f8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
/*
* 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 OpenSim 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;
using System.Threading;

namespace OpenSim.Region.ScriptEngine.Common.ScriptEngineBase
{
    /// <summary>
    /// This class does maintenance on script engine.
    /// </summary>
    public class MaintenanceThread : iScriptEngineFunctionModule
    {
        public ScriptEngine m_ScriptEngine;
        private int MaintenanceLoopms;

        public MaintenanceThread(ScriptEngine _ScriptEngine)
        {
            m_ScriptEngine = _ScriptEngine;

            ReadConfig();

            // Start maintenance thread
            StartMaintenanceThread();
        }

        ~MaintenanceThread()
        {
            StopMaintenanceThread();
        }

        public void ReadConfig()
        {
            MaintenanceLoopms = m_ScriptEngine.ScriptConfigSource.GetInt("MaintenanceLoopms", 50);
        }

        #region " Maintenance thread "
        /// <summary>
        /// Maintenance thread. Enforcing max execution time for example.
        /// </summary>
        public Thread MaintenanceThreadThread;

        /// <summary>
        /// Starts maintenance thread
        /// </summary>
        private void StartMaintenanceThread()
        {
            if (MaintenanceThreadThread == null)
            {
                MaintenanceThreadThread = new Thread(MaintenanceLoop);
                MaintenanceThreadThread.Name = "ScriptMaintenanceThread";
                MaintenanceThreadThread.IsBackground = true;
                MaintenanceThreadThread.Start();
            }
        }

        /// <summary>
        /// Stops maintenance thread
        /// </summary>
        private void StopMaintenanceThread()
        {
#if DEBUG
            m_ScriptEngine.Log.Debug("[" + m_ScriptEngine.ScriptEngineName + "]: StopMaintenanceThread() called");
#endif
            PleaseShutdown = true;
            Thread.Sleep(100);
            try
            {
                if (MaintenanceThreadThread != null)
                {
                    if (MaintenanceThreadThread.IsAlive)
                    {
                        MaintenanceThreadThread.Abort();
                    }
                }
            }
            catch (Exception ex)
            {
                m_ScriptEngine.Log.Error("[" + m_ScriptEngine.ScriptEngineName + "]: Exception stopping maintenence thread: " + ex.ToString());
            }
        }

        /// <summary>
        /// A thread should run in this loop and check all running scripts
        /// </summary>
        public void MaintenanceLoop()
        {
            if (m_ScriptEngine.m_EventQueueManager.maxFunctionExecutionTimens < MaintenanceLoopms)
                m_ScriptEngine.Log.Warn("[" + m_ScriptEngine.ScriptEngineName + "]: " +
                                           "Configuration error: MaxEventExecutionTimeMs is less than MaintenanceLoopms. The Maintenance Loop will only check scripts once per run.");

            long Last_maxFunctionExecutionTimens = 0; // DateTime.Now.Ticks;
            long Last_ReReadConfigFilens = DateTime.Now.Ticks;
            while (true)
            {
                try
                {
                    while (true)
                    {
                        System.Threading.Thread.Sleep(MaintenanceLoopms); // Sleep before next pass
                        if (PleaseShutdown)
                            return;

                        if (m_ScriptEngine != null)
                        {
                            //
                            // Re-reading config every x seconds
                            //
                            if (m_ScriptEngine.RefreshConfigFilens > 0)
                            {
                                // Check if its time to re-read config
                                if (DateTime.Now.Ticks - Last_ReReadConfigFilens > m_ScriptEngine.RefreshConfigFilens)
                                {
                                    //Console.WriteLine("Time passed: " + (DateTime.Now.Ticks - Last_ReReadConfigFilens) + ">" + m_ScriptEngine.RefreshConfigFilens );
                                    // Its time to re-read config file
                                    m_ScriptEngine.ReadConfig();
                                    Last_ReReadConfigFilens = DateTime.Now.Ticks; // Reset time
                                }
                            }

                            //
                            // Adjust number of running script threads if not correct
                            //
                            if (m_ScriptEngine.m_EventQueueManager != null)
                                m_ScriptEngine.m_EventQueueManager.AdjustNumberOfScriptThreads();

                            //
                            // Check if any script has exceeded its max execution time
                            //
                            if (m_ScriptEngine.m_EventQueueManager != null && m_ScriptEngine.m_EventQueueManager.EnforceMaxExecutionTime)
                            {
                                // We are enforcing execution time
                                if (DateTime.Now.Ticks - Last_maxFunctionExecutionTimens >
                                    m_ScriptEngine.m_EventQueueManager.maxFunctionExecutionTimens)
                                {
                                    // Its time to check again
                                    m_ScriptEngine.m_EventQueueManager.CheckScriptMaxExecTime(); // Do check
                                    Last_maxFunctionExecutionTimens = DateTime.Now.Ticks; // Reset time
                                }
                            }
                        } // m_ScriptEngine != null
                    }
                }
                catch (Exception ex)
                {
                    m_ScriptEngine.Log.Error("[" + m_ScriptEngine.ScriptEngineName + "]: Exception in MaintenanceLoopThread. Thread will recover after 5 sec throttle. Exception: " + ex.ToString());
                    Thread.Sleep(5000);
                }
            }
        }
        #endregion

        /// <summary>
        /// If set to true then threads and stuff should try to make a graceful exit
        /// </summary>
        public bool PleaseShutdown
        {
            get { return _PleaseShutdown; }
            set { _PleaseShutdown = value; }
        }
        private bool _PleaseShutdown = false;
    }
}