A Microservice based Architecture for a Presence Service in the Cloud

Presence service enables sharing of, and a subscription to the end users presence (online or offline) status. Primarily used for instant messaging applications, the presence service now finds its way into innovative solutions for domains such as wireless sensor networks and Internet of Things. The growth in users of instant messaging applications is ever increasing since the advent of social media networks. Presence service needs to be highly scalable to handle growing load of the users. Moreover, the user activity is inherently dynamic in nature which requires the presence service to be highly elastic to utilise resources efficiently. Traditional presence services are built as monoliths. Monolithic architectures by design are difficult to scale, lacks elasticity and are resource inefficient. Moreover, overprovisioning of resources to handle unanticipated loads further adds to resource inefficiency. Cloud computing and microservices are emerging paradigms that can help tackling the challenges above. Cloud computing with three key facets: Infrastructure-as-a-Service (IaaS), Platform-as-a-Service (PaaS), and Software-as-a-Service (SaaS) enable rapid provisioning and release of resources (e.g. storage, compute, network) on demand. Microservices is an approach of developing applications as a set of smaller, independent, and individually scalable services which communicate with each other using lightweight protocols. The on-demand nature of cloud computing provides a platform to achieve elastic scalability whereas microservices increase the scalability of the architecture. This thesis presents a microservice architecture for a presence service in the cloud. The architecture is based on a state of the art business model. The proposed architecture has three main components: A stateless front-end, a repository and a cache. The front end is built as a set of microservices exposed as SaaS. The front end, to remain technology agnostic, communicates with the repository using the Representational State Transfer (REST) interface. The cache provides fast data access to the front end. The front end microservices use message queues to communicate with each other. Besides, to check the feasibility of the architecture, a proof of concept prototype is implemented for a Session Initiation Protocol for Instant Messaging and Presence (SIMPLE) based presence service. Performance measurements have been made for the proposed and traditional architectures. Also, a comparative analysis of the results is done. The analysis of the results shows that the proposed architecture provides the desired scalability and elasticity to the presence service. Moreover, the proposed architecture provides lower response time and higher throughput in comparison to the traditional architecture

Remote service discovery and control for ubiquitous service environments in next-generation networks

Doktorgradsavhandling i informasjons- og kommunikasjonsteknologi, Universitetet i Agder, Grimstad, 201

Remote service discovery and control for ubiquitous service environments in next-generation networks

Doktorgradsavhandling i informasjons- og kommunikasjonsteknologi, Universitetet i Agder, Grimstad, 201

Study, Analysis and Modeling of IP Multimedia systems on next generation networks providing mobile and fixed multimedia services

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