A Powerful Logging Library for Ruby


Log4r is a comprehensive and flexible logging library written in Ruby for use in Ruby programs. It features a hierarchical logging system of any number of levels, custom level names, logger inheritance, multiple output destinations, execution tracing, custom formatting, thread safteyness, XML and YAML configuration, and more.

Log4r is an adherent to the philosophy of logging using simple print statements. What Log4r adds to this philosophy is a flexible way of controling the information being logged. Log information can be sent to any kind of destination and with varying degrees of importance. Log4r is designed so that logging statements can remain in production code with almost no extra computational cost.

Log4r intends to be easy to use and configure, no matter the complexity. Casual scripts can use Log4r right away with minimal configuration, while more sophisticated applications can set up a structured configuration file in XML or YAML. Comprehensive documentation is provided, with a user's manual, a reference API, and over a dozen examples. Log4r attempts to abide by the Principle of Least Surprise, which means that it works as intended at all points.

Log4r was inspired by and provides much of the features of the Apache Log4j project, but is not a direct implementation or clone. Aside from superficial similarities, the projects are not related in any way and the code base is completely distinct. Log4r was developed without even looking at the Apache Log4j code.

Log4r is an Open Source project and intends to remain that way. The Log4r license is similar to the Ruby Language license. It resides on this page and in the distribution in a file named LICENSE.

What's new in 1.1.6

Integration with Chainsaw

What's new in 1.1.4

Nested, Mapped and Global Diagnostic Contexts

Getting Started with

  1. Download the latest version via gems remote install:
  2. Try out the examples in the examples directory of the distribution
  3. Install by running ruby install.rb
  4. Read the nice manual
  5. Use Log4r
  6. Consult the Log4r RDoc API for reference
  7. Contribute!

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