Add new configuration option - cookie-max-age (#56)

Fix #55

Author: emre-aydin

README.md

@@ -104,6 +104,10 @@ To set up Hazelcast Session Clustering:
     <param-name>cookie-path</param-name>
     <param-value>/</param-value>
   </init-param>
+  <init-param>
+      <param-name>cookie-max-age</param-name>
+      <param-value>-1</param-value>
+    </init-param>
   <init-param>
     <param-name>use-request-parameter</param-name>
     <param-value>false</param-value>
@@ -136,6 +140,7 @@ Following are the descriptions of parameters included in the above XML.
 - `cookie-path`: Path of the session ID cookie. Its default value is based on the context path of the incoming request.
 - `cookie-secure`: Specifies whether the cookie only be sent using a secure protocol. Its default value is false.
 - `cookie-http-only`: Specifies whether the attribute `HttpOnly` can be set on cookie. Its default value is false.
+- `cookie-max-age`: Specifies the maximum age of the cookie in seconds. Its default value is `-1`, meaning the cookie is not stored persistently and will be deleted when the browser exits.
 - `config-location`: Location of Hazelcast configuration. It can be specified as a servlet resource, classpath resource or as a URL. Its default value is `hazelcast-default.xml` or `hazelcast.xml` in the classpath.
 - `instance-name`: Name of an existing Hazelcast instance, if you want to use it. Its default value is null. If you do not have an instance, then you should create one.
 - `use-client`: Specifies whether you want to connect to an existing cluster as a client. Its default value is false.

src/main/java/com/hazelcast/web/WebFilter.java

@@ -263,7 +263,7 @@ private void addSessionCookie(final HazelcastRequestWrapper req, final String se
             path = "/";
         }
         sessionCookie.setPath(path);
-        sessionCookie.setMaxAge(-1);
+        sessionCookie.setMaxAge(config.getCookieMaxAge());
         if (config.getCookieDomain() != null) {
             sessionCookie.setDomain(config.getCookieDomain());
         }

src/main/java/com/hazelcast/web/WebFilterConfig.java

@@ -59,6 +59,7 @@ public final class WebFilterConfig {
     private static final String COOKIE_SECURE = "cookie-secure";
     private static final String COOKIE_HTTP_ONLY = "cookie-http-only";
     private static final String COOKIE_PATH = "cookie-path";
+    private static final String COOKIE_MAX_AGE = "cookie-max-age";
 
     private boolean useClient;
     private URL configUrl;
@@ -75,6 +76,7 @@ public final class WebFilterConfig {
     private boolean cookieSecure;
     private boolean cookieHttpOnly;
     private String cookiePath;
+    private int cookieMaxAge;
 
     private WebFilterConfig() {
     }
@@ -108,6 +110,7 @@ public static WebFilterConfig create(FilterConfig filterConfig, Properties prope
         boolean cookieSecure = getBoolean(filterConfig, properties, COOKIE_SECURE, false);
         boolean cookieHttpOnly = getBoolean(filterConfig, properties, COOKIE_HTTP_ONLY, false);
         String cookiePath = getString(filterConfig, properties, COOKIE_PATH, null);
+        int cookieMaxAge = getInt(filterConfig, properties, COOKIE_MAX_AGE, -1);
 
         WebFilterConfig wfc = new WebFilterConfig();
         wfc.useClient = useClient;
@@ -125,6 +128,7 @@ public static WebFilterConfig create(FilterConfig filterConfig, Properties prope
         wfc.cookieSecure = cookieSecure;
         wfc.cookieHttpOnly = cookieHttpOnly;
         wfc.cookiePath = cookiePath;
+        wfc.cookieMaxAge = cookieMaxAge;
         return wfc;
     }
 
@@ -188,6 +192,10 @@ public String getCookiePath() {
         return cookiePath;
     }
 
+    public int getCookieMaxAge() {
+        return cookieMaxAge;
+    }
+
     private static boolean getBoolean(FilterConfig filterConfig, Properties properties, String paramName, boolean defaultValue) {
         String value = getValue(filterConfig, properties, paramName);
         if (StringUtil.isNullOrEmptyAfterTrim(value)) {