International Business Machines Corporation

Snap Inc.

Gavin David Beardall

Andrew David Banks

Stephen James Hobson

Ian C Vanstone

Adrian David Dick

Andrew D J Banks

Jose Emir Garza

Ian Charles Vanstone

Gary James Calder

Brian Clive Homewood

Paul Stephen Dennis

Andrew David James Banks

Martyn Honeyford

Simon Rowland

A client computer batch message transaction group is defined that corresponds to a set of client computers. A set of separate messages is received from at least some of the client computers in the client computer batch message transaction group. For each given separate message of the set of separate messages, a write is performed to a single message reception queue, and a determination is made regarding whether the given separate message was successfully written to the single message reception queue. Responsive to a determination that all messages of the set of separate messages were successfully written to the single message reception queue, all of the messages of the set of separate messages are written to disk as a single disk write.

Processing a unit of work

In response to receipt of a request message from a requester, a reply message is created. The reply message includes a message identifier of the request message copied from the received request message. The reply message is published to each of a group of replicated message queues. The reply message is identifiable by the requester using the copied message identifier of the request message on any one of the group of replicated message queues prior to being consumed by the requester.

Message delivery in messaging networks

A client computer batch message transaction group is created that includes a set of client computers from which messages are committed as a batch messaging transaction to a single message reception queue. In response to receiving separate messages from at least two of the set of client computers within the client computer batch message transaction group, the separate messages are grouped under the batch messaging transaction as a single unit of work to commit to the single message reception queue. A single batch transaction commit decision is computed based upon whether a write of each of the separate messages grouped within the single unit of work to the single message reception queue is successful.

A client computer group is created at a server computer by selecting a subset of a group of client computers, where each of the group of client computers has a separate communication channel with the server computer. A message from at least one of the subset of the group of client computers is received at the server computer. In response to receiving messages from at least two of the subset of the group of client computers within the client computer group, the messages are grouped under a single unit of work. A single decision associated with the single unit of work for the client computer group is computed. Each of the at least two of the subset of the group of client computers is operable to accept the single decision.

A method and computer program product is disclosed for managing a message broker and subscriber application programs in a publish/subscribe messaging system so as to maintain the state of the subscriber application program on the broker subscriber application program.

Managing a message subscription in a publish/subscribe messaging system

A method and system for message delivery in messaging networks is provided. The system provides a group of replicated queues for messages that are operable to be identified by an application before a message is read. The group of replicated queues are defined in association with a group of message managing systems, where a message is sent to each of the group of replicated queues to be accessible using any one of the group of message managing systems. The method includes creating a message including a unique identifier, and sending the message to each of a group of replicated queues with the message identifiable by the unique identifier information prior to the message being consumed.

A publish/subscribe messaging network in which a distributed set of publish/subscribe brokers comprises a first subset of publish/subscribe brokers, each arranged to store proxy subscription information for the whole of the distributed set of brokers; and a second subset of publish/subscribe brokers, each configured to send subscription information for local subscribers to one or more brokers within the first subset of publish/subscribe brokers, and configured to request, from a broker within the first subset of brokers, proxy subscription information following receipt of a message.

Scalable publish/subscribe messaging systems and methods

Improving scalability and throughput in publish/subscribe messaging systems by allowing the spoke systems to vary the member of the hub collective that it attaches to. The scalability is improved because the spoke systems do not have to have a long lasting attachment to a specific hub system. Instead, the spoke systems can be redistributed more evenly when new spoke systems are added or removed. The throughput is increased by distributing workload and fan-out responsibilities within hub collectives. Availability is improved because single points of failure are removed. Ease of administration is also improved over a hierarchy by allowing child nodes to automatically change parent nodes if a parent node is modified or removed.

Improving scalability and throughput of a publish/subscribe network

Disclosed is a method comprising steps of: a broker software application receiving a first published message on a topic from a publisher application and storing the first published message in a local storage location along with an indicator which indicates that the first published message originated from a publisher application that is local to the broker software application; the broker software application receiving a second published message on the topic from another broker software application and storing the second published message in the local storage location in place of the previously stored first published message, along with an indicator which indicates that the second published message originated from a publisher application that is remote to the broker software application; and the broker software application delivering the second published message, from the local storage location, to a requesting subscriber application which has requested a last retained publication message on the topic.

Retained publish/subscribe system

In a method of controlling a network of interconnected publish/subscribe message brokers for routing publications from a plurality of publishers to interested subscribers, each message broker is arranged to receive publications from publishers both directly and via other brokers and to receive subscriptions and unsubscriptions from subscribers and other brokers for publications meeting predefined criteria identified in the subscriptions or unsubscriptions. Each broker creates and manages a list correlating subscribers with the predefined criteria. It then matches received publications with the subscription list and forwards publications which match listed subscriptions which are in an active state to interested subscribers and interested other brokers in the list. Also, in response to received subscriptions and unsubscriptions, each broker generates and forwards proxy subscriptions and proxy unsubscriptions to other brokers. Each broker establishes a retention period for subscriptions. Then, in response to receipt of an unsubscription from a subscriber or a proxy unsubscription from another broker, it retains the corresponding subscription in a retained state for the retention period. During the retention period, matching publications will not be forwarded to the subscriber or other broker and no proxy unsubscriptions will be forwarded to other brokers. A new subscription for the same matching publications as the retained subscription during the retention period causes a reversion of the retained subscription to its active state. Propagation of proxy subscriptions and unsubscriptions is thus reduced in dependence on the duration of the retention period.

Growing community of inventors

Alresford, United Kingdom

Gavin David Beardall