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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.");
while (true)
{
try
{
long Last_maxFunctionExecutionTimens = 0; // DateTime.Now.Ticks;
long Last_ReReadConfigFilens = DateTime.Now.Ticks;
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.RefreshConfigFileSeconds > 0)
{
// Check if its time to re-read config
if (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;
}
}
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