OpenSim
/
OpenSimMirror
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Updating the flotsam asset cache. Thank you, mcortez! 

Fixes Mantis #3784
0.6.6-post-fixes
Melanie Thielker 2009-06-08 20:09:49 +00:00
parent b87f982a7e
commit 0356fef9ab
2 changed files with 553 additions and 461 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

961
OpenSim/Region/CoreModules/Asset/FlotsamAssetCache.cs
View File

@ -1,438 +1,523 @@
/*
* 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.IO;
using System.Collections.Generic;
using System.Reflection;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Threading;
using System.Timers;
using GlynnTucker.Cache;
using log4net;
using Nini.Config;
using Mono.Addins;
using OpenSim.Framework;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.Framework.Scenes;
using OpenSim.Services.Interfaces;
[assembly: Addin("FlotsamAssetCache", "1.0")]
[assembly: AddinDependency("OpenSim", "0.5")]
namespace OpenSim.Region.CoreModules.Asset
{
/// <summary>
/// OpenSim.ini Options:
/// -------
/// [Modules]
/// AssetCaching = "FlotsamAssetCache"
///
/// [AssetCache]
/// ; cache directory can be shared by multiple instances
/// CacheDirectory = /directory/writable/by/OpenSim/instance
///
/// ; Set to false for disk cache only.
/// MemoryCacheEnabled = true
///
/// ; How long {in hours} to keep assets cached in memory, .5 == 30 minutes
/// MemoryCacheTimeout = 2
///
/// ; How long {in hours} to keep assets cached on disk, .5 == 30 minutes
/// ; Specify 0 if you do not want your disk cache to expire
/// FileCacheTimeout = 0
///
/// ; How often {in hours} should the disk be checked for expired filed
/// ; Specify 0 to disable expiration checking
/// FileCleanupTimer = .166 ;roughly every 10 minutes
/// -------
/// </summary>
[Extension(Path = "/OpenSim/RegionModules", NodeName = "RegionModule")]
public class FlotsamAssetCache : ISharedRegionModule, IImprovedAssetCache
{
private static readonly ILog m_log =
LogManager.GetLogger(
MethodBase.GetCurrentMethod().DeclaringType);
private bool m_Enabled = false;
private const string m_ModuleName = "FlotsamAssetCache";
private const string m_DefaultCacheDirectory = m_ModuleName;
private string m_CacheDirectory = m_DefaultCacheDirectory;
private List<char> m_InvalidChars = new List<char>();
private uint m_DebugRate = 1; // How often to display hit statistics, given in requests
private static ulong m_Requests = 0;
private static ulong m_FileHits = 0;
private static ulong m_MemoryHits = 0;
private static double m_HitRateMemory = 0.0;
private static double m_HitRateFile = 0.0;
private List<string> m_CurrentlyWriting = new List<string>();
delegate void AsyncWriteDelegate(string file, AssetBase obj);
private ICache m_MemoryCache = new GlynnTucker.Cache.SimpleMemoryCache();
private bool m_MemoryCacheEnabled = true;
// Expiration is expressed in hours.
private const double m_DefaultMemoryExpiration = 1.0;
private const double m_DefaultFileExpiration = 48;
private TimeSpan m_MemoryExpiration = TimeSpan.Zero;
private TimeSpan m_FileExpiration = TimeSpan.Zero;
private TimeSpan m_FileExpirationCleanupTimer = TimeSpan.Zero;
private System.Timers.Timer m_CachCleanTimer = new System.Timers.Timer();
public FlotsamAssetCache()
{
m_InvalidChars.AddRange(Path.GetInvalidPathChars());
m_InvalidChars.AddRange(Path.GetInvalidFileNameChars());
}
public string Name
{
get { return m_ModuleName; }
}
public void Initialise(IConfigSource source)
{
IConfig moduleConfig = source.Configs["Modules"];
if (moduleConfig != null)
{
string name = moduleConfig.GetString("AssetCaching", this.Name);
m_log.DebugFormat("[XXX] name = {0} (this module's name: {1}", name, Name);
if (name == Name)
{
IConfig assetConfig = source.Configs["AssetCache"];
if (assetConfig == null)
{
m_log.Error("[ASSET CACHE]: AssetCache missing from OpenSim.ini");
return;
}
m_Enabled = true;
m_log.InfoFormat("[ASSET CACHE]: {0} enabled", this.Name);
m_CacheDirectory = assetConfig.GetString("CacheDirectory", m_DefaultCacheDirectory);
m_log.InfoFormat("[ASSET CACHE]: Cache Directory", m_DefaultCacheDirectory);
m_MemoryCacheEnabled = assetConfig.GetBoolean("MemoryCacheEnabled", true);
m_MemoryExpiration = TimeSpan.FromHours(assetConfig.GetDouble("MemoryCacheTimeout", m_DefaultMemoryExpiration));
m_FileExpiration = TimeSpan.FromHours(assetConfig.GetDouble("FileCacheTimeout", m_DefaultFileExpiration));
m_FileExpirationCleanupTimer = TimeSpan.FromHours(assetConfig.GetDouble("FileCleanupTimer", m_DefaultFileExpiration));
if ((m_FileExpiration > TimeSpan.Zero) && (m_FileExpirationCleanupTimer > TimeSpan.Zero))
{
m_CachCleanTimer.Interval = m_FileExpirationCleanupTimer.TotalMilliseconds;
m_CachCleanTimer.AutoReset = true;
m_CachCleanTimer.Elapsed += CleanupExpiredFiles;
m_CachCleanTimer.Enabled = true;
m_CachCleanTimer.Start();
}
else
{
m_CachCleanTimer.Enabled = false;
}
}
}
}
public void PostInitialise()
{
}
public void Close()
{
}
public void AddRegion(Scene scene)
{
if (m_Enabled)
scene.RegisterModuleInterface<IImprovedAssetCache>(this);
}
public void RemoveRegion(Scene scene)
{
}
public void RegionLoaded(Scene scene)
{
}
////////////////////////////////////////////////////////////
// IImprovedAssetCache
//
private void UpdateMemoryCache(string key, AssetBase asset)
{
if( m_MemoryCacheEnabled )
{
if (m_MemoryExpiration > TimeSpan.Zero)
{
m_MemoryCache.AddOrUpdate(key, asset, m_MemoryExpiration);
}
else
{
m_MemoryCache.AddOrUpdate(key, asset);
}
}
}
public void Cache(AssetBase asset)
{
// TODO: Spawn this off to some seperate thread to do the actual writing
if (asset != null)
{
UpdateMemoryCache(asset.ID, asset);
string filename = GetFileName(asset.ID);
try
{
// If the file is already cached, don't cache it, just touch it so access time is updated
if (File.Exists(filename))
{
File.SetLastAccessTime(filename, DateTime.Now);
} else {
// Once we start writing, make sure we flag that we're writing
// that object to the cache so that we don't try to write the
// same file multiple times.
lock (m_CurrentlyWriting)
{
if (m_CurrentlyWriting.Contains(filename))
{
return;
}
else
{
m_CurrentlyWriting.Add(filename);
}
}
// Setup the actual writing so that it happens asynchronously
AsyncWriteDelegate awd = delegate( string file, AssetBase obj )
{
WriteFileCache(file, obj);
};
// Go ahead and cache it to disk
awd.BeginInvoke(filename, asset, null, null);
}
}
catch (Exception e)
{
string[] text = e.ToString().Split(new char[] { '\n' });
foreach (string t in text)
{
m_log.InfoFormat("[ASSET CACHE]: {0} ", t);
}
}
}
}
public AssetBase Get(string id)
{
m_Requests++;
AssetBase asset = null;
object obj;
if (m_MemoryCacheEnabled && m_MemoryCache.TryGet(id, out obj))
{
asset = (AssetBase)obj;
m_MemoryHits++;
}
else
{
try
{
string filename = GetFileName(id);
if (File.Exists(filename))
{
FileStream stream = File.Open(filename, FileMode.Open);
BinaryFormatter bformatter = new BinaryFormatter();
asset = (AssetBase)bformatter.Deserialize(stream);
stream.Close();
UpdateMemoryCache(id, asset);
m_FileHits++;
}
}
catch (Exception e)
{
string[] text = e.ToString().Split(new char[] { '\n' });
foreach (string t in text)
{
m_log.InfoFormat("[ASSET CACHE]: {0} ", t);
}
}
}
if (m_Requests % m_DebugRate == 0)
{
m_HitRateFile = (double)m_FileHits / m_Requests * 100.0;
m_log.DebugFormat("[ASSET CACHE]: Cache Get :: {0} :: {1}", id, asset == null ? "Miss" : "Hit");
m_log.DebugFormat("[ASSET CACHE]: File Hit Rate {0}% for {1} requests", m_HitRateFile.ToString("0.00"), m_Requests);
if (m_MemoryCacheEnabled)
{
m_HitRateMemory = (double)m_MemoryHits / m_Requests * 100.0;
m_log.DebugFormat("[ASSET CACHE]: Memory Hit Rate {0}% for {1} requests", m_HitRateMemory.ToString("0.00"), m_Requests);
}
}
return asset;
}
public void Expire(string id)
{
try
{
string filename = GetFileName(id);
if (File.Exists(filename))
{
File.Delete(filename);
}
if( m_MemoryCacheEnabled )
m_MemoryCache.Remove(id);
}
catch (Exception e)
{
string[] text = e.ToString().Split(new char[] { '\n' });
foreach (string t in text)
{
m_log.InfoFormat("[ASSET CACHE]: {0} ", t);
}
}
}
public void Clear()
{
foreach (string dir in Directory.GetDirectories(m_CacheDirectory))
{
Directory.Delete(dir);
}
if( m_MemoryCacheEnabled )
m_MemoryCache.Clear();
}
private void CleanupExpiredFiles(object source, ElapsedEventArgs e)
{
foreach (string dir in Directory.GetDirectories(m_CacheDirectory))
{
foreach (string file in Directory.GetFiles(dir))
{
if (DateTime.Now - File.GetLastAccessTime(file) > m_FileExpiration)
{
File.Delete(file);
}
}
}
}
private string GetFileName(string id)
{
// Would it be faster to just hash the darn thing?
foreach (char c in m_InvalidChars)
{
id = id.Replace(c, '_');
}
string p = id.Substring(id.Length - 4);
p = Path.Combine(p, id);
return Path.Combine(m_CacheDirectory, p);
}
private void WriteFileCache(string filename, AssetBase asset)
{
try
{
// Make sure the target cache directory exists
string directory = Path.GetDirectoryName(filename);
if (!Directory.Exists(directory))
{
Directory.CreateDirectory(directory);
}
// Write file first to a temp name, so that it doesn't look
// like it's already cached while it's still writing.
string tempname = Path.Combine(directory, Path.GetRandomFileName());
Stream stream = File.Open(tempname, FileMode.Create);
BinaryFormatter bformatter = new BinaryFormatter();
bformatter.Serialize(stream, asset);
stream.Close();
// Now that it's written, rename it so that it can be found.
File.Move(tempname, filename);
m_log.DebugFormat("[ASSET CACHE]: Cache Stored :: {0}", asset.ID);
}
catch (Exception e)
{
string[] text = e.ToString().Split(new char[] { '\n' });
foreach (string t in text)
{
m_log.InfoFormat("[ASSET CACHE]: {0} ", t);
}
}
finally
{
// Even if the write fails with an exception, we need to make sure
// that we release the lock on that file, otherwise it'll never get
// cached
lock (m_CurrentlyWriting)
{
if (m_CurrentlyWriting.Contains(filename))
{
m_CurrentlyWriting.Remove(filename);
}
}
}
}
}
}
/*
Copyright (c) Contributors, http://osflotsam.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 Flotsam 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. */
// Uncomment to make asset Get requests for existing
// #define WAIT_ON_INPROGRESS_REQUESTS
using System;
using System.IO;
using System.Collections.Generic;
using System.Reflection;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Threading;
using System.Timers;
using log4net;
using Nini.Config;
using Mono.Addins;
using OpenMetaverse;
using OpenSim.Framework;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.Framework.Scenes;
using OpenSim.Services.Interfaces;
[assembly: Addin("FlotsamAssetCache", "1.1")]
[assembly: AddinDependency("OpenSim", "0.5")]
namespace Flotsam.RegionModules.AssetCache
{
/// <summary>
/// OpenSim.ini Options:
/// -------
/// [Modules]
/// AssetCaching = "FlotsamAssetCache"
///
/// [AssetCache]
/// ; cache directory can be shared by multiple instances
/// CacheDirectory = /directory/writable/by/OpenSim/instance
///
/// ; Log level
/// ; 0 - (Error) Errors only
/// ; 1 - (Info) Hit Rate Stats + Level 0
/// ; 2 - (Debug) Cache Activity (Reads/Writes) + Level 1
/// ;
/// LogLevel = 1
///
/// ; How often should hit rates be displayed (given in AssetRequests)
/// ; 0 to disable
/// HitRateDisplay = 100
///
/// ; Set to false for disk cache only.
/// MemoryCacheEnabled = true
///
/// ; How long {in hours} to keep assets cached in memory, .5 == 30 minutes
/// MemoryCacheTimeout = 2
///
/// ; How long {in hours} to keep assets cached on disk, .5 == 30 minutes
/// ; Specify 0 if you do not want your disk cache to expire
/// FileCacheTimeout = 0
///
/// ; How often {in hours} should the disk be checked for expired filed
/// ; Specify 0 to disable expiration checking
/// FileCleanupTimer = .166 ;roughly every 10 minutes
///
/// ; If WAIT_ON_INPROGRESS_REQUESTS has been defined then this specifies how
/// ; long (in miliseconds) to block a request thread while trying to complete
/// ; writing to disk.
/// WaitOnInprogressTimeout = 3000
/// -------
/// </summary>
[Extension(Path = "/OpenSim/RegionModules", NodeName = "RegionModule")]
public class FlotsamAssetCache : ISharedRegionModule, IImprovedAssetCache
{
private static readonly ILog m_log =
LogManager.GetLogger(
MethodBase.GetCurrentMethod().DeclaringType);
private bool m_Enabled = false;
private const string m_ModuleName = "FlotsamAssetCache";
private const string m_DefaultCacheDirectory = m_ModuleName;
private string m_CacheDirectory = m_DefaultCacheDirectory;
private List<char> m_InvalidChars = new List<char>();
private int m_LogLevel = 1;
private ulong m_HitRateDisplay = 1; // How often to display hit statistics, given in requests
private static ulong m_Requests = 0;
private static ulong m_RequestsForInprogress = 0;
private static ulong m_DiskHits = 0;
private static ulong m_MemoryHits = 0;
private static double m_HitRateMemory = 0.0;
private static double m_HitRateFile = 0.0;
#if WAIT_ON_INPROGRESS_REQUESTS
private Dictionary<string, ManualResetEvent> m_CurrentlyWriting = new Dictionary<string, ManualResetEvent>();
private int m_WaitOnInprogressTimeout = 3000;
#else
private List<string> m_CurrentlyWriting = new List<string>();
#endif
private ExpiringCache<string, AssetBase> m_MemoryCache = new ExpiringCache<string, AssetBase>();
private bool m_MemoryCacheEnabled = true;
// Expiration is expressed in hours.
private const double m_DefaultMemoryExpiration = 1.0;
private const double m_DefaultFileExpiration = 48;
private TimeSpan m_MemoryExpiration = TimeSpan.Zero;
private TimeSpan m_FileExpiration = TimeSpan.Zero;
private TimeSpan m_FileExpirationCleanupTimer = TimeSpan.Zero;
private System.Timers.Timer m_CachCleanTimer = new System.Timers.Timer();
public FlotsamAssetCache()
{
m_InvalidChars.AddRange(Path.GetInvalidPathChars());
m_InvalidChars.AddRange(Path.GetInvalidFileNameChars());
}
public string Name
{
get { return m_ModuleName; }
}
public void Initialise(IConfigSource source)
{
IConfig moduleConfig = source.Configs["Modules"];
if (moduleConfig != null)
{
string name = moduleConfig.GetString("AssetCaching", this.Name);
if (name == Name)
{
IConfig assetConfig = source.Configs["AssetCache"];
if (assetConfig == null)
{
m_log.Error("[ASSET CACHE]: AssetCache missing from OpenSim.ini");
return;
}
m_Enabled = true;
m_log.InfoFormat("[ASSET CACHE]: {0} enabled", this.Name);
m_CacheDirectory = assetConfig.GetString("CacheDirectory", m_DefaultCacheDirectory);
m_log.InfoFormat("[ASSET CACHE]: Cache Directory", m_DefaultCacheDirectory);
m_MemoryCacheEnabled = assetConfig.GetBoolean("MemoryCacheEnabled", true);
m_MemoryExpiration = TimeSpan.FromHours(assetConfig.GetDouble("MemoryCacheTimeout", m_DefaultMemoryExpiration));
#if WAIT_ON_INPROGRESS_REQUESTS
m_WaitOnInprogressTimeout = assetConfig.GetInt("WaitOnInprogressTimeout", 3000);
#endif
m_HitRateDisplay = (ulong)assetConfig.GetInt("HitRateDisplay", 1);
m_FileExpiration = TimeSpan.FromHours(assetConfig.GetDouble("FileCacheTimeout", m_DefaultFileExpiration));
m_FileExpirationCleanupTimer = TimeSpan.FromHours(assetConfig.GetDouble("FileCleanupTimer", m_DefaultFileExpiration));
if ((m_FileExpiration > TimeSpan.Zero) && (m_FileExpirationCleanupTimer > TimeSpan.Zero))
{
m_CachCleanTimer.Interval = m_FileExpirationCleanupTimer.TotalMilliseconds;
m_CachCleanTimer.AutoReset = true;
m_CachCleanTimer.Elapsed += CleanupExpiredFiles;
m_CachCleanTimer.Enabled = true;
m_CachCleanTimer.Start();
}
else
{
m_CachCleanTimer.Enabled = false;
}
}
}
}
public void PostInitialise()
{
}
public void Close()
{
}
public void AddRegion(Scene scene)
{
if (m_Enabled)
scene.RegisterModuleInterface<IImprovedAssetCache>(this);
}
public void RemoveRegion(Scene scene)
{
}
public void RegionLoaded(Scene scene)
{
}
////////////////////////////////////////////////////////////
// IImprovedAssetCache
//
private void UpdateMemoryCache(string key, AssetBase asset)
{
if( m_MemoryCacheEnabled )
{
if (m_MemoryExpiration > TimeSpan.Zero)
{
m_MemoryCache.AddOrUpdate(key, asset, m_MemoryExpiration);
}
else
{
m_MemoryCache.AddOrUpdate(key, asset, DateTime.MaxValue);
}
}
}
public void Cache(AssetBase asset)
{
// TODO: Spawn this off to some seperate thread to do the actual writing
if (asset != null)
{
UpdateMemoryCache(asset.ID, asset);
string filename = GetFileName(asset.ID);
try
{
// If the file is already cached, don't cache it, just touch it so access time is updated
if (File.Exists(filename))
{
File.SetLastAccessTime(filename, DateTime.Now);
} else {
// Once we start writing, make sure we flag that we're writing
// that object to the cache so that we don't try to write the
// same file multiple times.
lock (m_CurrentlyWriting)
{
#if WAIT_ON_INPROGRESS_REQUESTS
if (m_CurrentlyWriting.ContainsKey(filename))
{
return;
}
else
{
m_CurrentlyWriting.Add(filename, new ManualResetEvent(false));
}
#else
if (m_CurrentlyWriting.Contains(filename))
{
return;
}
else
{
m_CurrentlyWriting.Add(filename);
}
#endif
}
ThreadPool.QueueUserWorkItem(
delegate
{
WriteFileCache(filename, asset);
}
);
}
}
catch (Exception e)
{
LogException(e);
}
}
}
public AssetBase Get(string id)
{
m_Requests++;
AssetBase asset = null;
if (m_MemoryCacheEnabled && m_MemoryCache.TryGetValue(id, out asset))
{
m_MemoryHits++;
}
else
{
string filename = GetFileName(id);
if (File.Exists(filename))
{
try
{
FileStream stream = File.Open(filename, FileMode.Open);
BinaryFormatter bformatter = new BinaryFormatter();
asset = (AssetBase)bformatter.Deserialize(stream);
stream.Close();
UpdateMemoryCache(id, asset);
m_DiskHits++;
}
catch (System.Runtime.Serialization.SerializationException e)
{
LogException(e);
// If there was a problem deserializing the asset, the asset may
// either be corrupted OR was serialized under an old format
// {different version of AssetBase} -- we should attempt to
// delete it and re-cache
File.Delete(filename);
}
catch (Exception e)
{
LogException(e);
}
}
#if WAIT_ON_INPROGRESS_REQUESTS
// Check if we're already downloading this asset. If so, try to wait for it to
// download.
if (m_WaitOnInprogressTimeout > 0)
{
m_RequestsForInprogress++;
ManualResetEvent waitEvent;
if (m_CurrentlyWriting.TryGetValue(filename, out waitEvent))
{
waitEvent.WaitOne(m_WaitOnInprogressTimeout);
return Get(id);
}
}
#else
// Track how often we have the problem that an asset is requested while
// it is still being downloaded by a previous request.
if (m_CurrentlyWriting.Contains(filename))
{
m_RequestsForInprogress++;
}
#endif
}
if (((m_LogLevel >= 1)) && (m_HitRateDisplay != 0) && (m_Requests % m_HitRateDisplay == 0))
{
m_HitRateFile = (double)m_DiskHits / m_Requests * 100.0;
m_log.InfoFormat("[ASSET CACHE]: Cache Get :: {0} :: {1}", id, asset == null ? "Miss" : "Hit");
m_log.InfoFormat("[ASSET CACHE]: File Hit Rate {0}% for {1} requests", m_HitRateFile.ToString("0.00"), m_Requests);
if (m_MemoryCacheEnabled)
{
m_HitRateMemory = (double)m_MemoryHits / m_Requests * 100.0;
m_log.InfoFormat("[ASSET CACHE]: Memory Hit Rate {0}% for {1} requests", m_HitRateMemory.ToString("0.00"), m_Requests);
}
m_log.InfoFormat("[ASSET CACHE]: {0} unnessesary requests due to requests for assets that are currently downloading.", m_RequestsForInprogress);
}
return asset;
}
public void Expire(string id)
{
if (m_LogLevel >= 2)
m_log.DebugFormat("[ASSET CACHE]: Expiring Asset {0}.", id);
try
{
string filename = GetFileName(id);
if (File.Exists(filename))
{
File.Delete(filename);
}
if( m_MemoryCacheEnabled )
m_MemoryCache.Remove(id);
}
catch (Exception e)
{
LogException(e);
}
}
public void Clear()
{
if (m_LogLevel >= 2)
m_log.Debug("[ASSET CACHE]: Clearing Cache.");
foreach (string dir in Directory.GetDirectories(m_CacheDirectory))
{
Directory.Delete(dir);
}
if( m_MemoryCacheEnabled )
m_MemoryCache.Clear();
}
private void CleanupExpiredFiles(object source, ElapsedEventArgs e)
{
if (m_LogLevel >= 2)
m_log.DebugFormat("[ASSET CACHE]: Checking for expired files older then {0}.", m_FileExpiration.ToString());
foreach (string dir in Directory.GetDirectories(m_CacheDirectory))
{
foreach (string file in Directory.GetFiles(dir))
{
if (DateTime.Now - File.GetLastAccessTime(file) > m_FileExpiration)
{
File.Delete(file);
}
}
}
}
private string GetFileName(string id)
{
// Would it be faster to just hash the darn thing?
foreach (char c in m_InvalidChars)
{
id = id.Replace(c, '_');
}
string p = id.Substring(id.Length - 4);
p = Path.Combine(p, id);
return Path.Combine(m_CacheDirectory, p);
}
private void WriteFileCache(string filename, AssetBase asset)
{
try
{
// Make sure the target cache directory exists
string directory = Path.GetDirectoryName(filename);
if (!Directory.Exists(directory))
{
Directory.CreateDirectory(directory);
}
// Write file first to a temp name, so that it doesn't look
// like it's already cached while it's still writing.
string tempname = Path.Combine(directory, Path.GetRandomFileName());
Stream stream = File.Open(tempname, FileMode.Create);
BinaryFormatter bformatter = new BinaryFormatter();
bformatter.Serialize(stream, asset);
stream.Close();
// Now that it's written, rename it so that it can be found.
File.Move(tempname, filename);
if (m_LogLevel >= 2)
m_log.DebugFormat("[ASSET CACHE]: Cache Stored :: {0}", asset.ID);
}
catch (Exception e)
{
LogException(e);
}
finally
{
// Even if the write fails with an exception, we need to make sure
// that we release the lock on that file, otherwise it'll never get
// cached
lock (m_CurrentlyWriting)
{
#if WAIT_ON_INPROGRESS_REQUESTS
ManualResetEvent waitEvent;
if (m_CurrentlyWriting.TryGetValue(filename, out waitEvent))
{
m_CurrentlyWriting.Remove(filename);
waitEvent.Set();
}
#else
if (m_CurrentlyWriting.Contains(filename))
{
m_CurrentlyWriting.Remove(filename);
}
#endif
}
}
}
private static void LogException(Exception e)
{
string[] text = e.ToString().Split(new char[] { '\n' });
foreach (string t in text)
{
m_log.ErrorFormat("[ASSET CACHE]: {0} ", t);
}
}
}
}

53
bin/config-include/GridCommon.ini.example
View File

@ -3,33 +3,40 @@
;AssetCaching = "GlynnTuckerAssetCache"
;AssetCaching = "CenomeMemoryAssetCache"
AssetCaching = "FlotsamAssetCache"
[AssetCache]
;; ---- Optional configurations for FlotsamAssetCache
; cache directory can be shared by multiple instances
CacheDirectory = /directory/writable/by/OpenSim/instance
; Log level
; 0 - (Error) Errors only
; 1 - (Info) Hit Rate Stats + Level 0
; 2 - (Debug) Cache Activity (Reads/Writes) + Level 1
;
; The cache directory can be shared by multiple instances,
; so you may want to change this! Note that you can
; specify an absolute path (starting with '/').
; See examples in comments.
; Make sure the directory you specify can be created.
;
CacheDirectory = ./assetcache
;
; Some other examples:
; CacheDirectory = /var/opensim/assetcache ; (Windows and linux)
; CacheDirectory = ~/assetcache ; (Windows and linux)
; CacheDirectory = C:\opensim\assetcache ; (Windows only)
;
; How long {in hours} to keep assets cached on disk,
; .5 == 30 minutes; 168 = 7 days
LogLevel = 0
; How often should hit rates be displayed (given in AssetRequests)
; 0 to disable
HitRateDisplay = 100
; Set to false for disk cache only.
MemoryCacheEnabled = true
; How long {in hours} to keep assets cached in memory, .5 == 30 minutes
MemoryCacheTimeout = 2
; How long {in hours} to keep assets cached on disk, .5 == 30 minutes
; Specify 0 if you do not want your disk cache to expire
;
FileCacheTimeout = 168
FileCacheTimeout = 0
; How often {in hours} should the disk be checked for expired filed
; Specify 0 to disable expiration checking
FileCleanupTimer = .166 ;roughly every 10 minutes
;; --------- endof FlotsamAssetCache --------
; If WAIT_ON_INPROGRESS_REQUESTS has been defined then this specifies how
; long (in miliseconds) to block a request thread while trying to complete
; an existing write to disk.
; WaitOnInprogressTimeout = 3000
[AssetService]