Controlling Handler Logging

Controlling Logging in the Handler

The Handler logs an important aspects of its execution into the directory specified by the OnixS::CBOE::Trading::CMi2::HandlerSettings::logDirectory member value. Logging includes network data received and processed by the Handler and, of course, errors occurred at execution time.

Since the Handler outputs logging data into regular files, this affects its performance and sometimes requires significant system resources like space on hard drive. The Handler exposes several parameters which allow to suppress certain kind of logging data and thus reduce load to the file system as well as to increase general performance.

Following table describes logging-related parameters exposed by the OnixS::CBOE::Trading::CMi2::HandlerSettings structure:

Settings Member	Default value	Description
logLevel	OnixS::CBOE::Trading::CMi2::LogLevel::Info	Specifies whether the Handler must output informational messages about its state as well as which kind of information must be put into the log. For more information, please, take a look at the description of OnixS::CBOE::Trading::CMi2::LogLevel enumeration entries.
logSettings	OnixS::CBOE::Trading::CMi2::LogSettings::Default	If logging is activated, this member specifies which additional data must be put into the log. For more information, please, take a look at the description of OnixS::CBOE::Trading::CMi2::LogSettings enumeration entries.

Activating Logging Example

Following example demonstrates how to enable logging in the Handler:

using namespace OnixS::CBOE::Trading::CMi2;

HandlerSetting settings;

// Activate logging.
settings.logMode = LogModes::Debug;

// Don't forget to define folder where logs to be stored.
settings.logDirectory = "./logs";

// In addition to standard information, decoded messages will be logged.
settings.logSettings = LogSettings::DumpProtocolText;