From 33cc1f297a0a390829407a8422161bf022d8ef53 Mon Sep 17 00:00:00 2001
From: eugenp <hanriseldon@gmail.com>
Date: Thu, 1 Aug 2013 23:53:50 +0300
Subject: [PATCH] session listener initial work

---
 .../src/main/webapp/WEB-INF/web.xml           | 69 +++++++-------
 .../web/SessionListenerWithMetrics.java       | 32 +++++++
 .../src/main/webapp/WEB-INF/web.xml           | 93 ++++++++++---------
 3 files changed, 112 insertions(+), 82 deletions(-)
 create mode 100644 spring-security-mvc-custom/src/main/java/org/baeldung/web/SessionListenerWithMetrics.java

diff --git a/spring-mvc-xml/src/main/webapp/WEB-INF/web.xml b/spring-mvc-xml/src/main/webapp/WEB-INF/web.xml
index 872154064a..671813ac90 100644
--- a/spring-mvc-xml/src/main/webapp/WEB-INF/web.xml
+++ b/spring-mvc-xml/src/main/webapp/WEB-INF/web.xml
@@ -1,48 +1,45 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
-	xsi:schemaLocation="
+<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
+    xsi:schemaLocation="
       http://java.sun.com/xml/ns/javaee
-      http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
-	id="WebApp_ID" version="3.0">
+      http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
 
-	<display-name>Spring MVC XML Application</display-name>
+    <display-name>Spring MVC XML Application</display-name>
 
-	<!-- Spring root -->
-	<context-param>
-		<param-name>contextClass</param-name>
-		<param-value>
+    <!-- Spring root -->
+    <context-param>
+        <param-name>contextClass</param-name>
+        <param-value>
         	org.springframework.web.context.support.AnnotationConfigWebApplicationContext
       	</param-value>
-	</context-param>
-	<context-param>
-		<param-name>contextConfigLocation</param-name>
-		<param-value>org.baeldung.spring</param-value>
-	</context-param>
+    </context-param>
+    <context-param>
+        <param-name>contextConfigLocation</param-name>
+        <param-value>org.baeldung.spring</param-value>
+    </context-param>
 
-	<listener>
-		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
-	</listener>
+    <listener>
+        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
+    </listener>
 
-	<!-- Spring child -->
-	<servlet>
-		<servlet-name>mvc</servlet-name>
-		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
-		<load-on-startup>1</load-on-startup>
-	</servlet>
-	<servlet-mapping>
-		<servlet-name>mvc</servlet-name>
-		<url-pattern>/</url-pattern>
-	</servlet-mapping>
+    <!-- Spring child -->
+    <servlet>
+        <servlet-name>mvc</servlet-name>
+        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
+        <load-on-startup>1</load-on-startup>
+    </servlet>
+    <servlet-mapping>
+        <servlet-name>mvc</servlet-name>
+        <url-pattern>/</url-pattern>
+    </servlet-mapping>
 
-	<!-- additional config -->
+    <!-- additional config -->
 
-	<session-config>
-		<session-timeout>10</session-timeout>
-	</session-config>
-
-	<welcome-file-list>
-		<welcome-file>index.html</welcome-file>
-	</welcome-file-list>
+    <session-config>
+        <session-timeout>10</session-timeout>
+    </session-config>
+    <welcome-file-list>
+        <welcome-file>index.html</welcome-file>
+    </welcome-file-list>
 
 </web-app>
\ No newline at end of file
diff --git a/spring-security-mvc-custom/src/main/java/org/baeldung/web/SessionListenerWithMetrics.java b/spring-security-mvc-custom/src/main/java/org/baeldung/web/SessionListenerWithMetrics.java
new file mode 100644
index 0000000000..7119b7023e
--- /dev/null
+++ b/spring-security-mvc-custom/src/main/java/org/baeldung/web/SessionListenerWithMetrics.java
@@ -0,0 +1,32 @@
+package org.baeldung.web;
+
+import javax.servlet.http.HttpSessionEvent;
+import javax.servlet.http.HttpSessionListener;
+
+public class SessionListenerWithMetrics implements HttpSessionListener {
+
+    private static int totalActiveSessions;
+
+    public SessionListenerWithMetrics() {
+        super();
+    }
+
+    // API
+
+    public static int getTotalActiveSession() {
+        return totalActiveSessions;
+    }
+
+    @Override
+    public void sessionCreated(final HttpSessionEvent arg0) {
+        totalActiveSessions++;
+        System.out.println("sessionCreated - add one session into counter");
+    }
+
+    @Override
+    public void sessionDestroyed(final HttpSessionEvent arg0) {
+        totalActiveSessions--;
+        System.out.println("sessionDestroyed - deduct one session from counter");
+    }
+
+}
\ No newline at end of file
diff --git a/spring-security-mvc-custom/src/main/webapp/WEB-INF/web.xml b/spring-security-mvc-custom/src/main/webapp/WEB-INF/web.xml
index 73216e669f..bf691dc491 100644
--- a/spring-security-mvc-custom/src/main/webapp/WEB-INF/web.xml
+++ b/spring-security-mvc-custom/src/main/webapp/WEB-INF/web.xml
@@ -1,56 +1,57 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
-	xsi:schemaLocation="
+<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
+    xsi:schemaLocation="
       http://java.sun.com/xml/ns/javaee
-      http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
-	id="WebApp_ID" version="3.0">
+      http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
 
-	<display-name>Spring MVC Custom Application</display-name>
+    <display-name>Spring MVC Custom Application</display-name>
 
-	<session-config>
-		<session-timeout>1</session-timeout>
-	</session-config>
-	
-	<!-- Spring root -->
-	<context-param>
-		<param-name>contextClass</param-name>
-		<param-value>
-         org.springframework.web.context.support.AnnotationConfigWebApplicationContext
-      </param-value>
-	</context-param>
-	<context-param>
-		<param-name>contextConfigLocation</param-name>
-		<param-value>org.baeldung.spring</param-value>
-	</context-param>
+    <session-config>
+        <session-timeout>1</session-timeout>
+    </session-config>
+    <listener>
+        <listener-class>org.baeldung.web.SessionListenerWithMetrics</listener-class>
+    </listener>
 
-	<listener>
-		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
-	</listener>
+    <!-- Spring root -->
+    <context-param>
+        <param-name>contextClass</param-name>
+        <param-value>
+        	org.springframework.web.context.support.AnnotationConfigWebApplicationContext
+        </param-value>
+    </context-param>
+    <context-param>
+        <param-name>contextConfigLocation</param-name>
+        <param-value>org.baeldung.spring</param-value>
+    </context-param>
 
-	<!-- Spring child -->
-	<servlet>
-		<servlet-name>mvc</servlet-name>
-		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
-		<load-on-startup>1</load-on-startup>
-	</servlet>
-	<servlet-mapping>
-		<servlet-name>mvc</servlet-name>
-		<url-pattern>/</url-pattern>
-	</servlet-mapping>
+    <listener>
+        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
+    </listener>
 
-	<!-- Spring Security -->
-	<filter>
-		<filter-name>springSecurityFilterChain</filter-name>
-		<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
-	</filter>
-	<filter-mapping>
-		<filter-name>springSecurityFilterChain</filter-name>
-		<url-pattern>/*</url-pattern>
-	</filter-mapping>
+    <!-- Spring child -->
+    <servlet>
+        <servlet-name>mvc</servlet-name>
+        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
+        <load-on-startup>1</load-on-startup>
+    </servlet>
+    <servlet-mapping>
+        <servlet-name>mvc</servlet-name>
+        <url-pattern>/</url-pattern>
+    </servlet-mapping>
 
-	<!-- <welcome-file-list> -->
-	<!-- <welcome-file>index.html</welcome-file> -->
-	<!-- </welcome-file-list> -->
+    <!-- Spring Security -->
+    <filter>
+        <filter-name>springSecurityFilterChain</filter-name>
+        <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
+    </filter>
+    <filter-mapping>
+        <filter-name>springSecurityFilterChain</filter-name>
+        <url-pattern>/*</url-pattern>
+    </filter-mapping>
+
+    <!-- <welcome-file-list> -->
+    <!-- <welcome-file>index.html</welcome-file> -->
+    <!-- </welcome-file-list> -->
 
 </web-app>
\ No newline at end of file