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Pub/Sub systems over VANETs can be employed to disseminate information in terms of events to vehicle users who desire the information. This paper describes the design, implementation, and evaluation of APUS, a content-based Pub/Sub system for VANETs. APUS can handle the subscriptions with complicated spatial-temporal constraints and forward the notifications to the specified areas so that vehicle...
Pub/Sub services in the cloud are intended to achieve high performance and high scalability. The challenge comes from how to deal with the potential wide variation in workloads. The paper constructs a content-based Pub/Sub service named OPS4Cloud on the top of cloud infrastructure from scratch. OPS4Cloud manages its brokers by regions and presents a VM-based region adjustment strategy. It builds two-level...
For constructing a Pub/Sub middleware to detect and disseminate events in the Internet of Things (IoT), we have to pay close attention to the following requirements: (1) the IoT applications usually care about the events with both spatial and temporal extents, (2) It must address the issues brought by the IoT features, such as autonomy embedded in collaboration among things, dynamics implied by running...
Pub/Sub systems permit users to submit subscriptions and notify interested users of the events detected in a distributed way. Moving a Pub/Sub system to a cloud infrastructure is for high performance and scalability. This paper describes how to migrate two Pub/Sub systems i.e. PADRES and Once Pub Sub to Xen Cloud Platform, especially proposes black-box method, grey-box method and white-box method...
In Pub/Sub systems, channel-based approaches to routing the subscriptions and events have many advantages such as fewer routing messages, lower costs for subscription management, etc. But a potential issue embedded in this kind of approach, i.e. loadings on different event brokers are apt to unbalancing, is ignored more or less. In this paper, we design a load balancing mechanism and integrate it...
In a Pub/Sub system, the procedure of distributed event detection can be divided into two interacting phases: the subscription matching and the subscription/event routing. Also, the performance of the system is greatly influenced by these two parts. Adopting a reuse strategy in matching and routing can reduce matching workload and network traffic. However, few of the existing researches provide a...
Pub/Sub systems can facilitate monitoring and managing objects for RFID applications. To fully support RFID applications, Pub/Sub systems should provide the means of subscribing RFID tags and the corresponding efficient matching algorithm. This paper provides the management mechanism and matching algorithm for primitive subscriptions whose specification permits to subscribe RFID codes. Our approach...
In a Pub/Sub system, if the clients are permitted to move randomly, their mobility will cause their access brokers to be changed, which has brought in problems in dissemination of subscriptions and distribution of matching results. We claim that channelization-based routing algorithms can be applied to the Pub/Sub systems which support wireless clients. In this paper, we discuss the related issues...
Bringing in complex events in distributed pub/sub systems enables users to observe complicated event correlations over time and space. However, the routing of complex events in pub/sub systems is still largely unexplored, especially lacking quantitative analysis and deep assessment. This paper focuses on the deployment of composite subscriptions, formulating the traffic cost by using the traffic analysis...
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