Drupal 8 Module Development

The Drupal 8 logging theory

Before going ahead with our example, let's cover some theoretical notions regarding the logging framework in Drupal 8. In doing so, we will try to understand the key players we will need to interact with.

First, we have LoggerChannel, which represents a category of logged messages. They resemble the former $type argument to the Drupal 7 watchdog() function. A key difference, however, is that they are objects through which we do the actual logging via the logger plugins themselves. In this respect, they are used by our second main player, LoggerChannelFactory, a service that is normally our main contact with the logging framework as a client code.

To understand these things better, let’s consider the following example ...