Abstract: There is disclosed a method, apparatus, computer program and computer program product for facilitating access by an application to a data structure comprising a plurality of objects. A request is received from the application which initiates the return of the data structure. A handle is assigned to each of at least some of the plurality of objects. Objects in the data structure are retrieved and the application is informed of assigned handles thereby enabling the application to access retrieved objects.

Abstract: There is disclosed a method, apparatus, computer program and computer program product for facilitating access by an application to a data structure comprising a plurality of objects. A request is received from the application which initiates the return of the data structure. A handle is assigned to each of at least some of the plurality of objects. Objects in the data structure are retrieved and the application is informed of assigned handles thereby enabling the application to access retrieved objects.

Abstract: The present invention provides methods, apparatus and computer programs for event-based control of subscription matching in a publish/subscribe communications environment. Activation and/or deactivation events are associated with subscriptions at a publish/subscribe broker and are used to control when a subscription is active. The broker is responsive to temporally-unpredictable events, such as receipt of a published message on a predefined activation topic, to activate subscription matching for messages that are subsequently received or which have been received earlier and retained at the broker. Conventional subscription matching can be avoided for a registered subscription while that subscription is inactive, and subscribers are not required to explicitly and repeatedly subscribe and unsubscribe.

Abstract: The invention relates to a message brokering system for connecting a client in a local publish/subscribe messaging system to a remote message broker. The system comprises a message broker in said local publish/subscribe messaging system and a metabroker application means representing said remote message broker. The local message broker comprises publish/subscribe means for proxying messages between the client and the metabroker application means. The metabroker application means comprises publish/subscribe means for proxying messages between the local broker and the remote broker.

Abstract: An aircraft fuel tank assembly includes a tank for holding fuel, a canister and a fuel pump assembly. The fuel pump assembly includes: an electric motor, a pump and an electronics unit. The electronics unit and canister are arranged so that, in use, a dry bay is defined between the electronics unit and the canister.

Abstract: There is disclosed a method, apparatus, computer program and computer program product for facilitating access by an application to a data structure comprising a plurality of objects. A request is received from the application which initiates the return of the data structure. A handle is assigned to each of at least some of the plurality of objects. Objects in the data structure are retrieved and the application is informed of assigned handles thereby enabling the application to access retrieved objects.

Abstract: The invention relates to a message brokering system for connecting a client in a local publish/subscribe messaging system to a remote message broker. The system comprises a message broker in said local publish/subscribe messaging system and a metabroker application means representing said remote message broker. The local message broker comprises publish/subscribe means for proxying messages between the client and the metabroker application means. The metabroker application means comprises publish/subscribe means for proxying messages between the local broker and the remote broker.

Abstract: There is disclosed a method, apparatus, computer program and computer program product for facilitating access by an application to a data structure comprising a plurality of objects. A request is received from the application which initiates the return of the data structure. A handle is assigned to each of at least some of the plurality of objects. Objects in the data structure are retrieved and the application is informed of assigned handles thereby enabling the application to access retrieved objects.

Abstract: An aircraft fuel tank assembly includes a tank for holding fuel, a canister and a fuel pump assembly. The fuel pump assembly includes: an electric motor, a pump and an electronics unit. The electronics unit and canister are arranged so that, in use, a dry bay is defined between the electronics unit and the canister.

Abstract: The invention relates to a message brokering system for connecting a client in a local publish/subscribe messaging system to a remote message broker. The system comprises a message broker in said local publish/subscribe messaging system and a metabroker application means representing said remote message broker. The local message broker comprises publish/subscribe means for proxying messages between the client and the metabroker application means. The metabroker application means comprises publish/subscribe means for proxying messages between the local broker and the remote broker.

Abstract: In a publish/subscribe system, messages may be received from one or more publishers and forwarded to one or more subscribers who have registered an interest in receiving messages on topics to which the messages pertain. An improved retention mechanism is implemented by identifying a message is one for which retention may be applicable. Once the message has been identified, an algorithm is executed to establish a retention policy for the message. The algorithm may be based on the message contents or upon the state of the publish/subscribe system or the history of publish/subscribe transactions relating to the topic to which the message pertains.

Abstract: The present invention provides methods, apparatus and computer programs for event-based control of subscription matching in a publish/subscribe communications environment. Activation and/or deactivation events are associated with subscriptions at a publish/subscribe broker and are used to control when a subscription is active. The broker is responsive to temporally-unpredictable events, such as receipt of a published message on a predefined activation topic, to activate subscription matching for messages that are subsequently received or which have been received earlier and retained at the broker. Conventional subscription matching can be avoided for a registered subscription while that subscription is inactive, and subscribers are not required to explicitly and repeatedly subscribe and unsubscribe.