Internal, system driven events of different types (debug messages, errors, warnings, etc.) occuring within in UBIK® are recorded by a logging mechanism. This information supports the user in finding issues in the design process or to identify the reasons for problems at runtime. The mechanisms can be configured for the Web Service, the UBIK® Studio as well as for the UBIK® Enterprise Service. A general description of the technique used can be found on the Microsoft page for Configuring Services.
Version 3.6
- With Version 3.6 we Replaced our existing Microsoft.Practices.EnterpriseLibrary.Logging with more up-to-date solution like Serilog.
What is Serilog
Serilog is a portable and structured logging framework to record diagnostic logs into files, console and SQL/NoSQL databases.
Serilog existing log event levels
- Log Levels taken from the Serilog doku : https://github.com/serilog/serilog/wiki/Configuration-Basics
| LogLevel | Purpose |
|---|---|
| Verbose | It is the noisiest level, generally used only as a last resort when debugging a difficult problem, and rarely (if ever) enabled for a production app. For example, local variables within an algorithm implementation might be logged at this level. |
| Debug | Debug is used for internal system events that are not necessarily observable from the outside, but useful when determining how something happened. For example, the details of requests and responses made to and from external integration points would often be logged at this level. |
| Information | Information events describe things happening in the system that correspond to its responsibilities and functions. Generally, these are the observable actions the system can perform. For example, processing a payment or updating a user's details will be logged at this level. |
| Warning | When service is degraded, endangered, or may be behaving outside of its expected parameters, Warning level events are used. A warning event should only be emitted when the condition is either transient or can be investigated and fixed - use restraint to avoid polluting the log with spurious warnings. For example, slow response times from a critical database would be logged as warnings. |
| Error | When functionality is unavailable or expectations broken, an Error event is used. For example, receiving an exception when trying to commit a database transaction is an event at this level. |
| Fatal | The most critical level, Fatal events demand immediate attention. For example, an application failing during startup will log a Fatal event. If you have a pager, it goes off when one of these occurs. |
Logging methods used in UBIKKernel
| MethodName | Level | Purpose |
|---|---|---|
| LogVerbose | Verbose | method for writing a verbose log message to the output log file logged as Verbose event level. (new) |
| LogDebugOutput | Debug | method for writing a debug log message to the output log file logged as Debug event level. |
| LogInformation | Information | method for writing an information log message to the output log file logged as Information event level. (new) |
| LogSQLStatement LogSQLCommand | Information | method for writing a sql log message to the output log file logged as Information event level. |
| LogCustomizing | Information | method for writing a customizing log message to the output log file logged as Information event level. |
| LogService | Information | method for writing a customizing log message to the output log file logged as Information event level. |
| LogWorkflowOutput | Information | method for writing a service log message to the output log file logged as Information event level. |
| ThrowAssertion | Warning | method for writing an assertion log message to the output log file logged as Information event level. |
| LogWarning | Warning | method for writing a warning log message to the output log file logged as Warning event level. |
| LogError | Error | method for writing an error log message to the output log file logged as Error event level. (new) |
| LogException | Error | method for writing an exception log message to the output log file logged as Error event level. |
| LogFatal | Fatal | method for writing a fatal log message to the output log file logged as Fatal event level. (new) |
How To Configure Logging
- Added a way for the User to configure the default log path, the file count limit, the log event level and rolling policies through Logger.config with changing only the “values”, which are set on their default.
- The default Log path is set to the installation directory of UBIK. Its value can be changed to any local path (e.g. value="C:\logs").
- Using OS Environment Variables (e.g. value="%SYSTEMDRIVE%\logs") is possible.
- Using Relative path's (e.g. value="..\logs" used for moving up in the hierarchy from the current directory) or (e.g. value=".\logs" represents the current directory itself) is possible.
- The default for the event level is set to Debug and its values can be changed to Verbose, Information, Warning, Error or Fatal.
- File default count limit is set to 31 and its values can be changed to any positive number.
- The default Rolling policies is set to Day and its values can be changed to "Day", "Month" or "Year".
<LoggingConfiguration>
<add key="LogRootPath" value=""/>
<!-- Values can be "Verbose", "Debug", "Information", "Warning", "Error", "Fatal". Normally "Debug" should be fine and you should only change if you know well what you do. -->
<add key="LogLevel" value="Debug"/>
<!-- The most recent 31 files are retained by default (i.e. one long month). If the value is empty the default will be applied. You must specifically set value="null" to remove this limit and all log files will be kept. You can set any other positive number -->
<add key="RetainedFileCountLimit" value="31"/>
<!-- Value can be either "Day", "Month" or "Year". Default is "Day"-->
<add key="RollingInterval" value="Day"/>
</LoggingConfiguration>
<add key="LogRootPath" value=""/>
<!-- Values can be "Verbose", "Debug", "Information", "Warning", "Error", "Fatal". Normally "Debug" should be fine and you should only change if you know well what you do. -->
<add key="LogLevel" value="Debug"/>
<!-- The most recent 31 files are retained by default (i.e. one long month). If the value is empty the default will be applied. You must specifically set value="null" to remove this limit and all log files will be kept. You can set any other positive number -->
<add key="RetainedFileCountLimit" value="31"/>
<!-- Value can be either "Day", "Month" or "Year". Default is "Day"-->
<add key="RollingInterval" value="Day"/>
</LoggingConfiguration>
How to configure logging Version 3.5 or erlier
Version 3.5 or erlier
Since Version 2.4.3 - Server the configuration has to be done in the Logging.config file. For older versions the configuration has to be done in one of the main configuration files.
Logging categories
UBIK® has different types of categories configured for the logging mechanism. The following categories can be configured in the configuration files. Categories with the remark internal are available via customizing code, but are used to log internal events. As it is not recommended to mix logging of internal events together with others, the two additional categories CUSTOMIZING and WORKFLOW have been created.
| Type | Description | Access |
|---|---|---|
| CUSTOMIZING | Log for events that occured in the customizing. This method is available by calling UBIKKernel.LogCustomizing(...) from the customizing code. |
public |
| WORKFLOW | Log for events that occured when running workflows which is provided by the WriteLogEntry Activity | public |
| ASSERTION | Log for failed Assertions | internal |
| WARNING | Log for events that created a warning | internal |
| ERROR | Log for events that created an error | internal |
| DEBUG | Log for events that have to be investigated in the development | internal |
| SQL | Log for events related to SQL queries | internal |
| EXCEPTION | Log for events that caused an exception | internal |