International Business Machines Corporation

Srinivas Hasti

Gabriel Garcia Montero

Arvind Srinivasan

David B Colasurdo

Ajay Arvind Apte

Graham Derek Wallis

Michael Joseph Spreitzer

David Ware

Kevin Edward Vaughan

Brian Keith Martin

Paul Stuart Williamson

Ryan Rozich

Michael L Fraenkel

Richard Andrew Backhouse

Renganathan Sundararaman

Anthony Richard Hagale

Neil G S Young

Scott Dilworth Johnson

Aravind Srinivasan

Gautam Singh

Gabe G Montero

Neil George Stanley Young

A system for managing inbound messages in a server complex including one or more message consumers. The system includes a server configured to receive the inbound messages from a first peripheral device and to transmit messages to one or more of the plurality of message consumers. The system also includes an inbound message queue coupled to the server, the inbound message queue configured to store inbound message until an age of any message stored on the inbound message queue exceeds a predetermined threshold.

Inbound message rate limit based on maximum queue times

A clone managed session affinity system, method and apparatus. A clone-managed session affinity method includes receiving a request from a client. The request includes a reference to a selected clone with which the client has a session affinity relationship. The clone determines whether a session affinity cancellation condition has arisen. If the clone determines that a session affinity termination condition has arisen, the session affinity relationship is cancelled.

Clone-managed session affinity

A method of routing messages to multiple consumers comprises determining a probability function defining message classification probabilities for each of a plurality of consumer sets, receiving a plurality of messages, classifying each message, storing each message in a queue, receiving notification of a consumer available to process a message, ascertaining the consumer set to which the available consumer belongs, accessing the probabilities for the ascertained consumer set, selecting a message classification according to the accessed probabilities, and transmitting a message, of the selected classification, to the available consumer.

Method of routing messages to multiple consumers

An improved method, apparatus, and computer instructions for managing a set of servers. Responsive to an indication that an alteration of applications on the set of servers providing a service is to occur, a first group of servers and a second group of servers are created from the set of servers. The first group is designated for handling ongoing sessions with unaltered applications. The applications in the second group are altered. A server from the first group is transitioned to the second group as ongoing sessions handled in the first group decrease in number to form a transitioned server, wherein the alteration of the applications are performed without interrupting the service.

Method and apparatus for updating application servers

A session is established between a user system and an existing version of a network application. Once the session is established, session information corresponding to the session is determined and then communicated to the user system. The session information typically includes a version identifier that identifies the existing version of the network application. Requests received during the same session are accompanied with the session information. The session information is used to route the requests to the existing version of the network application.

Managing multiple network application versions

Under the present invention, there is provided a voting mechanism for assigning an application server of an application server cluster the task of invalidating all sessions containing listeners in the cluster for a web application. A method for session invalidation processing comprises assigning a vote to a web application upon launch of the web application in an application server of the application server cluster, broadcasting the vote to other application servers of the application server cluster, receiving a vote for the web application from each of the other application servers in the application server cluster in which the web application has been launched, and assigning invalidation processing to the application server containing the web application having the highest vote. The votes are dynamically updated upon the removal or addition of an application server from/to the application server cluster.

Voting mechanism for session invalidation processing in an application server cluster

Session state affinity is maintained in a workload balancing system that includes a hypertext transfer protocol (HTTP) routing server and a plurality of application servers. The application servers maintain backup session state information for a first session to a first server of the plurality of application servers at fewer than all of the plurality of application servers, detect the unavailability of the first application server at an application server of the plurality of application servers other than the first application and determine a second server that continues the first session. An identification of the second server and the first session is sent from an application server of the plurality of application servers to a HTTP routing server responsive to detecting the unavailability of the first server. The identification of the second server and the first session is received at the HTTP routing server and communications associated with the first session are routed from the HTTP routing server to the second server responsive to receiving the identification of the second server so that backup session state information maintained at the second server is used to continue the first session from the first server at the second server.

Dynamically updating session state affinity

The invention is a method and apparatus for maintaining session affinity within a server farm when requests sharing a session ID switch between server groups or between server clones in a single server group. In accordance with the invention, client requests include a list of clone identification codes, each code uniquely identifying a clone within a server group for handling the request. The clone identification code may be appended to a session identification code. For each different server that handles a request in a session, a new clone identification code is appended without deleting or overwriting any previously appended clone identification codes. When a request is received, the list of clone identification codes associated with the request is parsed in a predetermined order to search for the first clone identification code that matches one of the clone identification codes of a server in the appropriate server group. If a match is detected, the request is dispatched to that clone. If no match is found, the request is dispatched to a server clone in the server group using any reasonable Work Load Management (WLM) mechanism and then the clone identification code of the selected clone is added to the list.

Method and apparatus for maintaining session affinity across multiple server groups

Extensible URI-pattern-based servlet request processing frameworks process and respond to requests for resources sent over a network by client programs to application programs in multi-tiered data processing systems. An extension processor component, an improved web container; and an improved web application architecture form the framework. The extension processor component includes one or more extension processor factories, each of which generates a single type of extension processor to handle specific application components. Each extension processor is adapted to respond to a request having a declared pattern. The extension processor factory resides within the web container and provides a list of patterns for which it is responsible. The extension factory also instantiates an extension processor to respond to a request having a pattern that matches that extension processor's declared pattern. The improved web application includes a request mapper adapted to route a request having a particular pattern to the appropriate extension processor.

Extensible URI-pattern-based servlet request processing framework

Method, system and program product for managing multiple network application versions

The invention is a method and apparatus for invalidating session data stored in a database. In accordance with the invention, http sessions stored in the database are allowed to remain in the database without real time testing for session time out. Instead, invalid (or timed out) sessions remain in the database until a specified time. At that specified time, all http sessions are invalidated without actually testing them for time out. Alternately, each session can be individually tested for time out and only those sessions which have actually timed out are removed from the database or otherwise invalidated.

Growing community of inventors

Durham, NC, United States of America

Srinivas Hasti