Struts session interceptor example with pre and post processing logic

package com.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;
import com.propertyReader.PropertyReader;

/**
 * The Class SessionInterceptor.
 */
public class SessionInterceptor implements Interceptor {

/** The Constant serialVersionUID. */
private static final long serialVersionUID = 1L;
/** The logger. */
protected final Log logger = LogFactory.getLog(getClass());

/* (non-Javadoc)
* @see com.opensymphony.xwork2.interceptor.Interceptor#init()
*/
public void init() {
logger.info("SessionInterceptor init..");
}

/* (non-Javadoc)
* @see com.opensymphony.xwork2.interceptor.Interceptor#destroy()
*/
public void destroy() {
logger.info("SessionInterceptor destroy...");
}

/* (non-Javadoc)
* @see com.opensymphony.xwork2.interceptor.Interceptor#intercept(com.opensymphony.xwork2.ActionInvocation)
*/
public String intercept(ActionInvocation invocation) throws Exception {
logger.info("SessionInterceptor intercepting...");
final ActionContext context = invocation.getInvocationContext();
HttpServletRequest request = (HttpServletRequest) context.get(ServletActionContext.HTTP_REQUEST);
HttpSession session = request.getSession(true);
String sessionValidate = (String) session.getAttribute("sessionValidate");
logger.info("Session validate: "+sessionValidate);
logger.info("Max inactive interval is: "+session.getAttribute("sessionTimeOut"));
String actionName = invocation.getInvocationContext().getName();
logger.info("Passing to action: "+actionName);
if(!actionName.equalsIgnoreCase("loginAction") && !(actionName.equalsIgnoreCase("demoExceptionHandler"))){
if ((sessionValidate == null || sessionValidate.equals("false"))) {
logger.info("User session expired..");
return PropertyReader.getStrutsConstantsProperty("sessionExpired");
}
}
String invocationString= invocation.invoke();
logger.info("Back to interceptor..");
logger.info("Back from action: "+actionName);
return invocationString;
}
}