protected void Application_Start()
{
EnvironmentHandle.Register();
AreaRegistration.RegisterAllAreas();
FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
RouteConfig.RegisterRoutes(RouteTable.Routes);
BundleConfig.RegisterBundles(BundleTable.Bundles);
BundleTable.EnableOptimizations = true;
}
private LMDBEnvironment(string directory,
LMDBEnvironmentFlags openFlags = LMDBEnvironmentFlags.None,
UnixAccessMode accessMode = UnixAccessMode.Default,
bool disableWriterThread = false,
bool disableReadTxnAutoreset = false)
{
NativeMethods.AssertExecute(NativeMethods.mdb_env_create(out var envHandle));
_handle = envHandle;
_accessMode = accessMode;
_disableReadTxnAutoreset = disableReadTxnAutoreset;
_directory = directory;
_openFlags = openFlags;
try
{
CreateDirectoryIfMissing();
}
catch
{
NativeMethods.mdb_env_close(envHandle);
throw;
}
MaxDatabases = Config.DbEnvironment.DefaultMaxDatabases;
// Writer Task
// In the current process writes are serialized via the blocking queue
// Accross processes, writes are synchronized via WriteTxnGate (TODO!)
_cts = new CancellationTokenSource();
if (!disableWriterThread)
{
_writeQueue = new BlockingCollection <Delegates>();
var threadStart = new ThreadStart(() =>
{
while (!_writeQueue.IsCompleted)
{
try
{
// BLOCKING
var delegates = _writeQueue.Take(_cts.Token);
var transactionImpl = TransactionImpl.Create(this, TransactionBeginFlags.ReadWrite);
try
{
// TODO for some methods such as mbd_put we should have a C method
// that begins/end txn automatically
// we still need to pass call to it here, but we could avoid txn creation
// and two P/Invokes
var txn = new Transaction(transactionImpl);
if (delegates.WriteFunction != null)
{
var res = delegates.WriteFunction(txn);
delegates.Tcs?.SetResult(res);
}
else if (delegates.WriteAction != null)
{
delegates.WriteAction(txn);
delegates.Tcs?.SetResult(null);
}
else
{
Environment.FailFast("Wrong writer thread setup");
}
}
catch (Exception e)
{
delegates.Tcs?.SetException(e);
transactionImpl?.Abort();
}
finally
{
transactionImpl?.Dispose();
}
}
catch (InvalidOperationException)
{
}
}
_writeTaskCompletion.SetResult(null);
});
var writeThread = new Thread(threadStart)
{
Name = "LMDB Writer thread",
IsBackground = true
};
writeThread.Start();
}
}
