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Added "better" multi thread handling to AvatarFactoryModule, which uses EventWaitHandles, I'm a bit concerned about what effect this might have on performance in a large grid. But I've spent long enough on this problem for one day and as its valentines day, I will be killed and tortured (most likely not in that order) if I don't stop work for the day soon.

ThreadPoolClientBranch
MW 2008-02-14 16:38:38 +00:00
parent 91d9248fce
commit 4616563cc4
1 changed files with 120 additions and 23 deletions
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137
OpenSim/Region/Environment/Modules/AvatarFactoryModule.cs
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@ -28,6 +28,7 @@
using System;
using System.Collections.Generic;
using System.Threading;
using libsecondlife;
using Nini.Config;
using OpenSim.Framework;
@ -51,18 +52,118 @@ namespace OpenSim.Region.Environment.Modules
private BaseDatabaseConnector m_databaseMapper;
private AppearanceTableMapper m_appearanceMapper;
private Dictionary<LLUUID, EventWaitHandle> m_fetchesInProgress = new Dictionary<LLUUID, EventWaitHandle>();
private object m_syncLock = new object();
public bool TryGetAvatarAppearance(LLUUID avatarId, out AvatarAppearance appearance)
{
//check cache
lock (m_avatarsAppearance)
appearance = CheckCache(avatarId);
if (appearance != null)
{
if (m_avatarsAppearance.ContainsKey(avatarId))
{
appearance = m_avatarsAppearance[avatarId];
return true;
}
//not in cache so check to see if another thread is already fetching it
//should only let one thread at a time do this part
EventWaitHandle waitHandle = null;
lock (m_syncLock)
{
if (m_fetchesInProgress.TryGetValue(avatarId, out waitHandle))
{
waitHandle.WaitOne();
appearance = CheckCache(avatarId);
if (appearance != null)
{
waitHandle = null;
return true;
}
else
{
waitHandle = null;
return false;
}
}
else
{
//no thread already fetching this appearance, so add a wait handle to list
//for any following threads that want the same appearance
waitHandle = new EventWaitHandle(false, EventResetMode.ManualReset);
m_fetchesInProgress.Add(avatarId, waitHandle);
}
}
//this is the first thread to request this appearance
//so let it check the db and if not found then create a default appearance
//and add that to the cache
appearance = CheckDatabase(avatarId);
if (appearance != null)
{
//appearance has now been added to cache so lets pulse any waiting threads
lock (m_syncLock)
{
m_fetchesInProgress.Remove(avatarId);
waitHandle.Set();
}
waitHandle = null;
return true;
}
//not found a appearance for the user, so create a new default one
appearance = CreateDefault(avatarId);
if (appearance != null)
{
//update database
if (m_enablePersist)
{
m_appearanceMapper.Add(avatarId.UUID, appearance);
}
//add appearance to dictionary cache
lock (m_avatarsAppearance)
{
m_avatarsAppearance[avatarId] = appearance;
}
//appearance has now been added to cache so lets pulse any waiting threads
lock (m_syncLock)
{
m_fetchesInProgress.Remove(avatarId);
waitHandle.Set();
}
waitHandle = null;
return true;
}
else
{
//something went wrong, so release the wait handle and remove it
//all waiting threads will fail to find cached appearance
//but its better for them to fail than wait for ever
lock (m_syncLock)
{
m_fetchesInProgress.Remove(avatarId);
waitHandle.Set();
}
waitHandle = null;
return false;
}
}
private AvatarAppearance CreateDefault(LLUUID avatarId)
{
AvatarAppearance appearance = null;
AvatarWearable[] wearables;
byte[] visualParams;
GetDefaultAvatarAppearance(out wearables, out visualParams);
appearance = new AvatarAppearance(avatarId, wearables, visualParams);
return appearance;
}
private AvatarAppearance CheckDatabase(LLUUID avatarId)
{
AvatarAppearance appearance = null;
//check db
if (m_enablePersist)
{
@ -74,28 +175,24 @@ namespace OpenSim.Region.Environment.Modules
{
m_avatarsAppearance[avatarId] = appearance;
}
return true;
}
}
return appearance;
}
//not found a appearance for the user, so create a new one
AvatarWearable[] wearables;
byte[] visualParams;
GetDefaultAvatarAppearance(out wearables, out visualParams);
appearance = new AvatarAppearance(avatarId, wearables, visualParams);
//add appearance to dictionary cache
private AvatarAppearance CheckCache(LLUUID avatarId)
{
AvatarAppearance appearance = null;
//check cache
lock (m_avatarsAppearance)
{
m_avatarsAppearance[avatarId] = appearance;
}
//update database
if (m_enablePersist)
if (m_avatarsAppearance.ContainsKey(avatarId))
{
m_appearanceMapper.Add(avatarId.UUID, appearance);
appearance = m_avatarsAppearance[avatarId];
// return true;
}
return true;
}
return appearance;
}
public void Initialise(Scene scene, IConfigSource source)