Logging

Another predefined logic layer is for logging purposes. Since there is a myriad of loggers out there, MicroStream doesn't provide any special adapter, but a generic type which can be used to adapt to the logging framework of your choice.
Just create a class and implement EntityLogger, and you are good to go.
public class JulLogger implements EntityLogger
{
	@Override
	public void afterUpdate(
		final Entity identity, 
		final Entity data, 
		final boolean successful)
	{
		Logger.getLogger(identity.getClass().getName())
			.info("Entity updated");
	}
}
Additional to afterUpdate there are further hooks:
entityCreated
afterRead
beforeUpdate
Now just add the logger when creating entities:
JulLogger logger = new JulLogger();
​
Person john = PersonCreator.New()
	.addLayer(logger)
	.firstName("John")
	.lastName("Doe")
	.create();
When you call
PersonUpdater.setLastName(john, "Smith");
the logger's output is
Oct 15, 2019 11:17:53 AM JulLogger afterUpdate
INFO: Entity updated
Versioning
Multiple Layers
Last updated 4 months ago