[jbossseam-issues] [JBoss JIRA] Created: (JBSEAM-1584) @Logger and Spring beans

[Magnus Heino (JIRA)]

@Logger and Spring beans
------------------------

                 Key: JBSEAM-1584
                 URL: http://jira.jboss.com/jira/browse/JBSEAM-1584
             Project: JBoss Seam
          Issue Type: Feature Request
          Components: Spring
    Affects Versions: 2.0.0.BETA1
            Reporter: Magnus Heino


It would be nice if spring beans could be scanned for @Logger and injected with Log instances just like seam components.

Using the code below, you can add this to applicationContext.xml...

<bean class="org.jboss.seam.ioc.spring.LoggerPostProcessor" />

...to have all spring beans scanned for @Logger and have a Log instance injected, just like seam components. Then you can access the same context and log functionallity in your spring beans as in your seam components.

I guess the seam spring namespace could be extended with <seam:logger/> to make it even more simple to use.

package org.jboss.seam.ioc.spring;

import java.lang.reflect.Field;

import org.jboss.seam.annotations.Logger;
import org.jboss.seam.log.Logging;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.util.ReflectionUtils;
import org.springframework.util.StringUtils;
import org.springframework.util.ReflectionUtils.FieldCallback;

public class LoggerPostProcessor implements BeanPostProcessor {

	public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
		return bean;
	}

	public Object postProcessBeforeInitialization(final Object bean, final String beanName) throws BeansException {
		ReflectionUtils.doWithFields(bean.getClass(), new FieldCallback() {
			public void doWith(Field field) throws IllegalArgumentException, IllegalAccessException {
				if (field.isAnnotationPresent(Logger.class)) {					

					String category = field.getAnnotation(Logger.class).value();
					
					if(!StringUtils.hasText(category)) {
						category = bean.getClass().getName();
					}
							
					ReflectionUtils.makeAccessible(field);					
					field.set(bean, Logging.getLog(category));
				}
			}
		});
		return bean;
	}
}


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