New in Symfony 2.3: Events in the Console Component

Contributed by
Fabien Potencier
in #7466.

Today, I'm about to write about one of the oldest feature requests for the Console component: the possibility to hook during the lifecycle of a command execution. I have been delaying this feature for a long time as I did not want to introduce a hard dependency between the Console component and the Event Dispatcher component.

But as of Symfony 2.3, you can listen to several events that are dispatched by the main console application:

1
2
3
4
5
6
7
8

useSymfony\Component\Console\Application;useSymfony\Component\EventDispatcher\EventDispatcher;$dispatcher=newEventDispatcher();$application=newApplication();$application->setDispatcher($dispatcher);$application->run();

Note that events are only dispatched if you inject an event dispatcher.

Three events are automatically dispatched:

• ConsoleEvents::COMMAND lets you do something before a command is executed;
• ConsoleEvents::TERMINATE lets you perform some cleanup actions after the command has been executed;
• ConsoleEvents::EXCEPTION lets you handle exceptions thrown during the execution of a command.

If you want to see some code example, read the full documentation about this new feature in the Console component documentation.