SeamFramework.orgCommunity Documentation
Questi moduli sono utilizzabili su qualsiasi implementazione JSR-299, non solo Web Beans!
Adding logging to your application is now even easier with simple injection of a logger object into any JSR-299 bean. Simply annotate a org.jboss.webbeans.log.Log type member with @Logger and an appropriate logger object will be injected into any instance of the bean.
public class Checkout {
import org.jboss.webbeans.annotation.Logger;
import org.jboss.webbeans.log.Log;
@Logger
private Log log;
void invoiceItems() {
ShoppingCart cart;
. . .
log.debug("Items invoiced for {0}", cart);
}
}
The example shows how objects can be interpolated into a message. This interpolation is done using java.text.MessageFormat, so see the JavaDoc for that class for more details. In this case, the ShoppingCart should have implemented the toString() method to produce a human readable value that is meaningful in messages. Normally, this call would have involved evaluating cart.toString() with String concatenation to produce a single String argument. Thus it was necessary to surround the call with an if-statement using the condition log.isDebugEnabled() to avoid the expensive String concatenation if the message was not actually going to be used. However, when using @Logger injected logging, the conditional test can be left out since the object arguments are not evaluated unless the message is going to be logged.
You can add the Web Beans Logger to your project by including webbeans-logger.jar and webbeans-logging.jar to your project. Alternatively, express a dependency on the org.jboss.webbeans:webbeans-logger Maven artifact.
If you are using Web Beans as your JSR-299 implementation, there is no need to include webbeans-logging.jar as it's already included.