Introduction to Fortran Logger

Fortran Logger is an essential tool for developers who work with Fortran and require robust logging
capabilities. This article provides an in-depth look at its various APIs, accompanied by code snippets
and an example application to illustrate their use.

API Examples

1. Basic Usage

Initial setup and basic logging:

  
    program main
      use logger_module
      call initialize_logger("logfile.log")
      call log_info("Program started")
      call log_error("An error has occurred")
      call finalize_logger()
    end program main
  

2. Log Levels

Setting different log levels:

  
    call set_log_level(LOG_LEVEL_WARN)
    call log_info("This is an info message") ! Won't be logged
    call log_warn("This is a warning message")
    call log_error("This is an error message")
  

3. Logging to Different Outputs

Logging to a file and console:

  
    call initialize_logger("logfile.log")
    call log_to_console(.true.)
    call log_info("This will be logged to both the file and console")
  

4. Conditional Logging

Log messages based on conditions:

  
    logical :: condition
    condition = .true.
    call log_if(condition, "Condition met, logging this message")
  

Complete Application Example

Let’s create a simple application that demonstrates the use of various Fortran Logger
functions.

  
    program weather_station
      use logger_module
      implicit none
      call initialize_logger("weather.log")
      call log_to_console(.true.)
      call set_log_level(LOG_LEVEL_INFO)

      call log_info("Weather station started")

      ! Simulate reading a temperature sensor
      call log_info("Reading temperature sensor")
      call log_info("Temperature: 23.5C")

      ! Simulate a warning condition
      call log_warn("Battery level low")

      ! Simulate an error condition
      call log_error("Temperature sensor failure")

      call log_info("Weather station shutting down")
      call finalize_logger()
    end program weather_station
  

By utilizing these APIs, you can ensure that your Fortran applications are easier to debug and maintain.

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