Supporting Mobility in Content-Based Publish/Subscribe Middleware

2003
Report or working paper

Publish/subscribe (pub/sub) is considered a valuable middleware architecture that proliferates loose coupling and leverages reconfigurability and evolution. Up to now, existing pub/sub middleware was optimized for static systems where users as well as the underlying system structure was rather fixed. We study the question whether existing pub/sub middleware can be extended to support mobile and location-dependent applications.We first analyze the requirements of such applications and distinguish two orthogonal forms of mobility: the system-centric physical mobility and an application-centric logical mobility (where users are aware that they are changing location). For logical-mobility we introduce location-dependent subscriptions as a suitable means to exploit the power of the event-based paradigm in mobile applications. Briefly spoken, a location-dependent subscription offers to express interest in all events which are related to a user's current location. We present efficient implementations for both forms of mobility within the content-based pub/sub middleware Rebeca. Our solutions draw much of their efficiency from the refined routing capabilities (namely, covering and merging) of the Rebeca system.

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2003
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Related concepts (3)

Pub

A pub (short for public house) is a drinking establishment licensed to serve alcoholic drinks for consumption on the premises. The term first appeared in the late 17th century, and was used to differentiate private houses from those which were open to the public as alehouses, taverns and inns. Today, there is no strict definition, but CAMRA states a pub has four characteristics: is open to the public without membership or residency serves draught beer or cider without requiring food be consumed has at least one indoor area not laid out for meals allows drinks to be bought at a bar (i.

Publish–subscribe pattern

In software architecture, publish–subscribe is a messaging pattern where publishers categorize messages into classes that are received by subscribers. This is contrasted to the typical messaging pattern model where publishers sends messages directly to a subscribers. Similarly, subscribers express interest in one or more classes and only receive messages that are of interest, without knowledge of which publishers, if any, there are. Publish–subscribe is a sibling of the message queue paradigm, and is typically one part of a larger message-oriented middleware system.

Automatic Dependent Surveillance–Broadcast

Automatic Dependent Surveillance–Broadcast (ADS-B) is a surveillance technology and form of Electronic Conspicuity in which an aircraft determines its position via satellite navigation or other sensors and periodically broadcasts it, enabling it to be tracked. The information can be received by air traffic control ground stations as a replacement for secondary surveillance radar, as no interrogation signal is needed from the ground. It can also be transmitted and received point-to-point by other aircraft to provide situational awareness and allow self-separation.