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/*
* Copyright (c) Contributors, http://www.openmetaverse.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.
*
*/
/* Original code: Tedd Hansen */
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Reflection;
using OpenSim.Region.Environment.Scenes.Scripting;
namespace OpenSim.Region.ScriptEngine.DotNetEngine
{
/// <summary>
/// EventQueueManager handles event queues
/// Events are queued and executed in separate thread
/// </summary>
[Serializable]
class EventQueueManager
{
private List<Thread> EventQueueThreads = new List<Thread>();
private object QueueLock = new object();
private int NothingToDoSleepms = 50;
private int NumberOfThreads = 2;
private Queue<QueueItemStruct> EventQueue = new Queue<QueueItemStruct>();
private struct QueueItemStruct
{
public IScriptHost ObjectID;
public string ScriptID;
public string FunctionName;
public object[] param;
}
private ScriptEngine myScriptEngine;
public EventQueueManager(ScriptEngine _ScriptEngine)
{
myScriptEngine = _ScriptEngine;
//myScriptEngine.m_logger.Verbose("ScriptEngine", "EventQueueManager Start");
// Start worker thread
for (int ThreadCount = 0; ThreadCount <= NumberOfThreads; ThreadCount++)
{
Thread EventQueueThread = new Thread(EventQueueThreadLoop);
EventQueueThreads.Add(EventQueueThread);
EventQueueThread.IsBackground = true;
EventQueueThread.Name = "EventQueueManagerThread_" + ThreadCount;
EventQueueThread.Start();
}
}
~EventQueueManager()
{
// Kill worker threads
foreach (Thread EventQueueThread in new System.Collections.ArrayList(EventQueueThreads))
{
if (EventQueueThread != null && EventQueueThread.IsAlive == true)
{
try
{
EventQueueThread.Abort();
EventQueueThread.Join();
}
catch (Exception e)
{
myScriptEngine.Log.Verbose("ScriptEngine", "EventQueueManager Exception killing worker thread: " + e.ToString());
}
}
}
EventQueueThreads.Clear();
// Todo: Clean up our queues
}
private void EventQueueThreadLoop()
{
//myScriptEngine.m_logger.Verbose("ScriptEngine", "EventQueueManager Worker thread spawned");
try
{
QueueItemStruct BlankQIS = new QueueItemStruct();
while (true)
{
QueueItemStruct QIS = BlankQIS;
bool GotItem = false;
if (EventQueue.Count == 0)
{
// Nothing to do? Sleep a bit waiting for something to do
Thread.Sleep(NothingToDoSleepms);
}
else
{
// Something in queue, process
//myScriptEngine.m_logger.Verbose("ScriptEngine", "Processing event for ObjectID: " + QIS.ObjectID + ", ScriptID: " + QIS.ScriptID + ", FunctionName: " + QIS.FunctionName);
// OBJECT BASED LOCK - TWO THREADS WORKING ON SAME OBJECT IS NOT GOOD
lock (QueueLock)
{
GotItem = false;
for (int qc = 0; qc < EventQueue.Count; qc++)
{
// Get queue item
QIS = EventQueue.Dequeue();
// Check if object is being processed by someone else
if (TryLock(QIS.ObjectID) == false)
{
// Object is already being processed, requeue it
EventQueue.Enqueue(QIS);
}
else
{
// We have lock on an object and can process it
GotItem = true;
break;
}
} // go through queue
} // lock
if (GotItem == true)
{
// Execute function
myScriptEngine.myScriptManager.ExecuteEvent(QIS.ObjectID, QIS.ScriptID, QIS.FunctionName, QIS.param);
ReleaseLock(QIS.ObjectID);
}
} // Something in queue
} // while
} // try
catch (ThreadAbortException tae)
{
myScriptEngine.Log.Verbose("ScriptEngine", "EventQueueManager Worker thread killed: " + tae.Message);
}
}
private List<IScriptHost> ObjectLocks = new List<IScriptHost>();
private object TryLockLock = new object();
private bool TryLock(IScriptHost ObjectID)
{
lock (TryLockLock)
{
if (ObjectLocks.Contains(ObjectID) == true)
{
return false;
}
else
{
ObjectLocks.Add(ObjectID);
return true;
}
}
}
private void ReleaseLock(IScriptHost ObjectID)
{
lock (TryLockLock)
{
if (ObjectLocks.Contains(ObjectID) == true)
{
ObjectLocks.Remove(ObjectID);
}
}
}
public void AddToObjectQueue(IScriptHost ObjectID, string FunctionName, object[] param)
{
// Determine all scripts in Object and add to their queue
//myScriptEngine.m_logger.Verbose("ScriptEngine", "EventQueueManager Adding ObjectID: " + ObjectID + ", FunctionName: " + FunctionName);
lock (QueueLock)
{
foreach (string ScriptID in myScriptEngine.myScriptManager.GetScriptKeys(ObjectID))
{
// Add to each script in that object
// TODO: Some scripts may not subscribe to this event. Should we NOT add it? Does it matter?
// Create a structure and add data
QueueItemStruct QIS = new QueueItemStruct();
QIS.ObjectID = ObjectID;
QIS.ScriptID = ScriptID;
QIS.FunctionName = FunctionName;
QIS.param = param;
// Add it to queue
EventQueue.Enqueue(QIS);
}
}
//public void AddToScriptQueue(string ObjectID, string FunctionName, object[] param)
//{
// // Add to script queue
//}
}
}
}
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