International Business Machines Corporation

Simon A J Holdsworth

Peter R MacFarlane

Andrew Ian Hickson

Michael James Ward

Timothy Nicholas Holloway

Corville O Allen

Gregory Alan Flurry

Piotr Przybylski

John Henry Green

Neil G S Young

James Michael Snell

Pamela H Fong

Provided are a message brokering systems, computer program products and methods for communication in a publish/subscribe environment in which publisher application programs send messages to subscriber application programs via one or more message brokers, the method comprising the following steps: responsive to receipt of a published message at a message broker, referring to characteristics of the received message and subscriber-specified quality of service requirements to determine an appropriate quality or service for onward transmission of the message; selecting a communication protocol in accordance with the determined quality of service; and transmitting the message using the selected communication protocol. Information relating to the quality of service requirements of a first message broker's subscribers is passed to other brokers and subsequently used for selection of an appropriate communication protocol for transmitting messages between the brokers.

Selection of communication protocol for message transfer based on quality of service requirements

Provided are methods, apparatus and computer programs for applying access controls to control operations on hierarchically organized data processing system resources. A number of different scopes of applicability can be set in association with an access control, such as an ACL, and this will determine the inheritability, non-inheritability or limited inheritability of the access control for resources in the hierarchy. When a request is received to perform an operation, the access controls for the relevant branch of the hierarchy are processed to determine an applicable access control&#x2014;taking account of inheritance attributes which have been set for individual access controls. The invention is useful for controlling the application of ACLs to topics in a topic tree within a publish/subscribe message broker.

Inheritance of controls within a hierarchy of data processing system resources

There is disclosed a method, apparatus and computer program product for receiving a message, the message being processable by a component on one of a plurality of processing threads. A message is received from a first component on a current thread. The communication style that was used by the first component is determined. Responsive to receipt of the message, the communication style that is desired to be used by a second component is determined. Responsive to determining that the two components are asynchronous, communication takes place with the second component using the current thread.

Method of receiving a message processable by a component on one of plurality of processing threads

A method and apparatus are disclosed for discovering and selecting faults where more than one programming model is involved. The present invention enables selection of faults and the mappings necessary to handle exceptions across multiple code environments.

Fault discovery and selection apparatus and method

Methods, systems, and products are disclosed in which port type agnostic proxy support for web services intermediaries is typically provided by receiving in a web services intermediary a request for execution of a web services operation, wherein the request includes parametric information from which an endpoint for a target service that supports the operation can be identified; identifying, in dependence upon the parametric data, the endpoint for a target service that supports the operation; creating a target service request for execution of the operation on the target service; and issuing the target service request to the target service. Exemplary embodiments typically also include the return path of request-response processing: receiving in the intermediary a response from the target service; creating in the intermediary, in dependence upon the response from the target service, a response from the intermediary; and returning the response from the intermediary to the requesting client.

Port type agnostic proxy support for web services intermediaries

A method and system for preserving message order when parallel processing messages by: providing a marker (H) in each message (M) for identifying a source of messages for which it is required to preserve the message order; and dispatching (D) each message in accordance with its marker to one of a plurality of parallel processors (P&#x2013;P) so that processing is preserved for messages processed through the plurality of parallel processors. The dispatcher (D) retains a list of all markers of messages that are being processed in parallel, and when a message becomes available to the dispatcher for processing, the dispatcher inspects the list of messages that are currently being processed to determine whether the marker of this message is in the list, and if so delays initiating parallel processing for this message until the marker is no longer in the list. This technique allows a stream of messages originating from multiple sources to be processed with the advantages of parallel processing, while preserving the order of a subset of these messages.

Growing community of inventors

Andover, United Kingdom

Simon A J Holdsworth