public MongoConnection AcquireConnection()
{
if (_serverInstance == null)
{
// first time we need a connection let Server.AcquireConnection pick the server instance
var connection = _server.AcquireConnection(_readPreference);
_serverInstance = connection.ServerInstance;
return(connection);
}
else
{
// all subsequent requests for the same cursor must go to the same server instance
return(_server.AcquireConnection(_serverInstance));
}
}
#pragma warning restore
private TCommandResult RunCommandAs <TCommandResult>(
IMongoCommand command,
IBsonSerializer <TCommandResult> resultSerializer) where TCommandResult : CommandResult
{
var readerSettings = new BsonBinaryReaderSettings
{
Encoding = _settings.ReadEncoding ?? MongoDefaults.ReadEncoding,
GuidRepresentation = _settings.GuidRepresentation
};
var writerSettings = new BsonBinaryWriterSettings
{
Encoding = _settings.WriteEncoding ?? MongoDefaults.WriteEncoding,
GuidRepresentation = _settings.GuidRepresentation
};
var readPreference = _settings.ReadPreference;
if (readPreference != ReadPreference.Primary)
{
if (_server.ProxyType == MongoServerProxyType.Unknown)
{
_server.Connect();
}
if (_server.ProxyType == MongoServerProxyType.ReplicaSet && !CanCommandBeSentToSecondary.Delegate(command.ToBsonDocument()))
{
readPreference = ReadPreference.Primary;
}
}
var flags = (readPreference == ReadPreference.Primary) ? QueryFlags.None : QueryFlags.SlaveOk;
var commandOperation = new CommandOperation <TCommandResult>(
_name,
readerSettings,
writerSettings,
command,
flags,
null, // options
readPreference,
resultSerializer);
var connection = _server.AcquireConnection(readPreference);
try
{
return(commandOperation.Execute(connection));
}
finally
{
_server.ReleaseConnection(connection);
}
}