System and method for scaling for a large number of concurrent users

A method for providing a stateful computer application to a multitude of users, the method comprising for a given user of the plurality of users:

• generating a session identification for a user session for the user, wherein the state of the stateful computer application is described by a set of user-specific session variables;
• retrieving a state representation related to the user from a storage using the session identification, wherein the state representation comprises information permitting to reconstruct the set of user-specific session variables;
• restoring the set of user-specific session variables for the user by using the retrieved state representation;
• calling functional computing logic based on the restored set of user-specific session variables, wherein the functional computing logic comprises the code of the stateful computer application, wherein the call provides an updated set of user-specific session variables;
• upon completion of functions performed by the called functional computing logic, assembling from the updated set of user-specific session variables an updated state representation for the user and storing the updated state representation in the storage, wherein the session identification is a primary key, wherein the updated state representation comprises information permitting to reconstruct the updated set of user-specific session variables
• wherein the functions performed by the functional computing logic are performed by a stateful computer system,
• wherein the functional computing logic comprises the code of the stateful computer application in an unmodified manner, and
• wherein the stateful computer system comprises a stateless locking framework module, wherein in case the calling of the functional computing logic comprises calling of locking functions of the stateful computer application, the stateless locking framework module substitutes the locking functions of the stateful computer application by substitute locking functions, wherein the substitute locking functions are adapted for providing database locks on data resources requested by the calling of the functional computing logic.

A computer system for providing a stateful computer application to a multitude of users, the system being adapted for performing the following steps for a given user of the plurality of users:

• generating a session identification for a user session for the user, wherein the state of the stateful computer application is described by a set of user-specific session variables;
• retrieving a state representation related to the user from a storage using the session identification, wherein the state representation comprises information permitting to reconstruct the set of user-specific session variables;
• restoring the set of user-specific session variables for the user by using the retrieved state representation;
• calling functional computing logic based on the restored set of user-specific session variables, wherein the functional computing logic comprises the code of the stateful computer application, wherein the call provides an updated set of user-specific session variables;
• calling of locking functions of the stateful computer application, wherein a stateless locking framework module substitutes the locking functions of the stateful computer application by substitute locking functions;
• upon completion of functions performed by the called functional computing logic, assembling from the updated set of user-specific session variables an updated state representation for the user and storing the updated state representation in the storage, wherein the session identification is a primary key, wherein the updated state representation comprises information permitting to reconstruct the updated set of user-specific session variables.