Merge pull request hazelcast#3370 from mheemskerk/allow-override-of-h…

…ttpsession

Allow WebFilter subclasses to override HazelcastHttpSession creation

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

@@ -305,7 +305,7 @@ protected HazelcastHttpSession createNewSession(RequestWrapper requestWrapper, S
         }
 
         HttpSession originalSession = requestWrapper.getOriginalSession(true);
-        HazelcastHttpSession hazelcastSession = new HazelcastHttpSession(id, originalSession, deferredWrite);
+        HazelcastHttpSession hazelcastSession = createHazelcastHttpSession(id, originalSession, deferredWrite);
         if (existingSessionId == null) {
             hazelcastSession.setClusterWideNew(true);
             // If the session is being created for the first time, add its initial reference in the cluster-wide map.
@@ -318,6 +318,19 @@ protected HazelcastHttpSession createNewSession(RequestWrapper requestWrapper, S
         return hazelcastSession;
     }
 
+    /**
+     * {@code HazelcastHttpSession instance} creation is split off to a separate method to allow subclasses to return a
+     * customized / extended version of {@code HazelcastHttpSession}.
+     *
+     * @param id the session id
+     * @param originalSession the original session
+     * @param deferredWrite whether writes are deferred
+     * @return a new HazelcastHttpSession instance
+     */
+    protected HazelcastHttpSession createHazelcastHttpSession(String id, HttpSession originalSession, boolean deferredWrite) {
+        return new HazelcastHttpSession(id, originalSession, deferredWrite);
+    }
+
     private void prepareReloadingSession(HazelcastHttpSession hazelcastSession) {
         if (deferredWrite && hazelcastSession != null) {
             Map<String, LocalCacheEntry> cache = hazelcastSession.localCache;