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Fix write conflicts for disk session cache

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Will use random waits when a write conflict is detected.
This should allow several clients to write at the same time.
Inspired from CSMA/CD (ethernet way of handling collisions).

Bug report by TNT-UP @ MC Forum post no.1684
This commit is contained in:
ORelio 2016-03-21 10:45:50 +01:00
parent 4a8b30ee94
commit 75bbeb0b4b
2 changed files with 27 additions and 11 deletions
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36
MinecraftClient/Protocol/SessionCache/SessionCache.cs
View file

@ -156,22 +156,38 @@ namespace MinecraftClient.Protocol.SessionCache
private static void SaveToDisk()
{
bool fileexists = File.Exists(SessionCacheFile);
IOException lastEx = null;
int attempt = 1;
using (FileStream fs = new FileStream(SessionCacheFile, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None))
while (attempt < 4)
{
cachemonitor.EnableRaisingEvents = false;
// delete existing file contents
if (fileexists)
try
{
fs.SetLength(0);
fs.Flush();
}
using (FileStream fs = new FileStream(SessionCacheFile, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None))
{
cachemonitor.EnableRaisingEvents = false;
formatter.Serialize(fs, sessions);
cachemonitor.EnableRaisingEvents = true;
// delete existing file contents
if (fileexists)
{
fs.SetLength(0);
fs.Flush();
}
formatter.Serialize(fs, sessions);
cachemonitor.EnableRaisingEvents = true;
}
return;
}
catch (IOException ex)
{
lastEx = ex;
attempt++;
System.Threading.Thread.Sleep(new Random().Next(150, 350) * attempt); //CSMA/CD :)
}
}
Console.WriteLine("Error writing cached sessions to disk" + (lastEx != null ? ": " + lastEx.Message : ""));
}
}
}

2
MinecraftClient/config/README.txt
View file

@ -112,7 +112,7 @@ If you are experienced with C#, you may also write a C# script.
That's a bit more involved, but way more powerful than regular scripts.
You can look to the provided sample C# scripts for getting started.
C# scripts can be used for creating your own ChatBot without recompiling the wole project.
C# scripts can be used for creating your own ChatBot without recompiling the whole project.
These bots are embedded in a script file, which is compiled and loaded on the fly.
ChatBots can access plugin channels for communicating with your own plugin.