BiobankLogProxy.java

package edu.ualberta.med.biobank.server.logging.user;

import org.acegisecurity.context.SecurityContextHolder;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.apache.log4j.Logger;


/**
 * this is call before any call into the ApplicationService instance.
 * 
 * See use application-config.xml.
 */
public class BiobankLogProxy implements MethodInterceptor {

    private static Logger log = Logger.getLogger(BiobankLogProxy.class
        .getName());

    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {

        String userName = null;
        try {
            userName = SecurityContextHolder.getContext().getAuthentication()
                .getName();
        } catch (NullPointerException e) {
            log.error("Error:  Unable to retrieve userName from SecurityContext; setting userName to 'dummy'"); //$NON-NLS-1$
            userName = "dummy"; //$NON-NLS-1$
        }

        log.debug("userName has been set to: " + userName); //$NON-NLS-1$

        UserInfoHelper.setUserName(userName);
        Object value = invocation.proceed();
        UserInfoHelper.setUserName(null);

        return value;
    }
}