Saverio Giallorenzo

Saverio Giallorenzo
University of Bologna | UNIBO · Department of Computer Science and Engineering DISI

PhD

About

62
Publications
19,748
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,361
Citations
Introduction
Skills and Expertise

Publications

Publications (62)
Article
Full-text available
The adoption of edge and fog systems, along with the introduction of privacy-preserving regulations, compel the usage of tools for expressing complex data queries in an ephemeral way. That is, queried data should not persist. Database engines partially address this need, as they provide domain-specific languages for querying data. Unfortunately, us...
Chapter
We formally define and implement a translation from domain models in the LEMMA modelling framework to microservice APIs in the Jolie programming language. Our tool enables a software development process whereby microservice architectures can first be designed with the leading method of Domain-Driven Design (DDD), and then corresponding data types a...
Preprint
Full-text available
State-of-the-art serverless platforms use hardcoded scheduling policies that are unaware of the possible topological constraints of functions. Considering these constraints when scheduling functions leads to sensible performance improvements, e.g., minimising loading times or data-access latencies. This issue becomes more pressing when considered i...
Conference Paper
Full-text available
Increased levels of digitalization in society expose companies to new security threats, requiring them to establish adequate security and privacy measures. Additionally, the presence of exogenous forces like new regulations, e.g., GDPR and the global COVID-19 pandemic, pose new challenges for companies that should preserve an adequate level of secu...
Preprint
We formally define and implement a translation from domain models in the LEMMA modelling framework to microservice APIs in the Jolie programming language. Our tool enables a software development process whereby microservice architectures can first be designed with the leading method of Domain-Driven Design, and then corresponding data types and ser...
Article
Full-text available
Microservices is an emerging paradigm for developing distributed systems. With their widespread adoption, more and more work investigated the relation between microservices and security. Alas, the literature on this subject does not form a well-defined corpus : it is spread over many venues and composed of contributions mainly addressing specific s...
Article
Full-text available
DevOps advocates the usage of Virtualization Technologies (VT), such as Virtual Machines and Containers. However, it is complex to predict how the usage of a given VT will impact on the performance of an application. In this paper, we present a collection of reference benchmarks that developers can use to orient when looking for the best-performing...
Chapter
Full-text available
In microservices, Model-Driven Engineering (MDE) has emerged as a powerful methodology for architectural design. Independently, the community of programming languages has investigated new linguistic abstractions for effective microservice development. Here, we present the first preliminary study of how the two approaches can cross-pollinate, taking...
Chapter
We develop a novel approach for run-time global adaptation of microservice applications, based on synthesis of architecture-level reconfiguration orchestrations. More precisely, we devise an algorithm for automatic reconfiguration that reaches a target system Maximum Computational Load by performing optimal deployment orchestrations. To conceive an...
Preprint
We develop a novel approach for run-time global adaptation of microservice applications, based on synthesis of architecture-level reconfiguration orchestrations. More precisely, we devise an algorithm for automatic reconfiguration that reaches a target system Maximum Computational Load by performing optimal deployment orchestrations. To conceive an...
Preprint
Full-text available
Increased levels of digitalization in society expose companies to new security threats, requiring them to establish adequate security and privacy measures. Additionally, the presence of exogenous forces like new regulations, e.g., GDPR and the global COVID-19 pandemic, pose new challenges for companies that should preserve an adequate level of secu...
Preprint
Full-text available
In the field of microservices, Model-Driven Engineering has emerged as a powerful methodology for architectural design, and new programming languages have introduced language abstractions to deal with microservice development more effectively. In this article, we present the first preliminary investigation of how the two approaches can be married,...
Conference Paper
Serverless computing is a paradigm for programming cloud applications in terms of stateless functions, executed and scaled in proportion to inbound requests. Here, we revisit SKC, a calculus capturing the essential features of serverless programming. By exploring the design space of the language, we refined the integration between the fundamental f...
Chapter
Serverless computing is a Cloud development paradigm where developers write and compose stateless functions, abstracting from their deployment and scaling. In this paper, we address the problem of function-execution scheduling, i.e., how to schedule the execution of Serverless functions to optimise their performance against some user-defined goals....
Preprint
Full-text available
Following previous work on the automated deployment orchestration of component based applications, where orchestrations are expressed in terms of behaviours satisfying component interface functional dependences, we develop a formal model specifically tailored for microservice architectures. The first result that we obtain is decidability of the pro...
Cover Page
Full-text available
We present the proceedings of the AMP 2020 workshop, co-located with XP 2020, and report our main insights from its conduction. The workshop focused on exploring the interplay between agile methods and microservice architectures. Due to the COVID outbreak, AMP 2020 was moved online, divided into two parts: a live presentation session and a three-we...
Preprint
Full-text available
We present Choral, the first framework for programming choreographies (multiparty protocols) that builds on top of mainstream programming abstractions: in Choral, choreographies are objects. Given a choreography that defines interactions among some roles (Alice, Bob, etc.), an implementation for each role in the choreography is automatically genera...
Chapter
Following previous work on the automated deployment of component-based applications, we present a formal model specifically tailored for reasoning on the deployment of microservice architectures. The first result that we present is a formal proof of decidability of the problem of synthesizing optimal deployment plans for microservice architectures,...
Chapter
In Choreographic Programming, a choreography specifies in a single artefact the expected behaviour of all the participants in a distributed system. The choreography is used to synthesise correct-by-construction programs for each participant. In previous work, we defined Dynamic Choreographies to support the update of distributed systems at runtime....
Chapter
Full-text available
Serverless computing, also known as Functions-as-a-Service, is a recent paradigm aimed at simplifying the programming of cloud applications. The idea is that developers design applications in terms of functions, which are then deployed on a cloud infrastructure. The infrastructure takes care of executing the functions whenever requested by remote c...
Preprint
In modern application areas for software systems --- like eHealth, the Internet-of-Things, and Edge Computing --- data is encoded in heterogeneous, tree-shaped data-formats, it must be processed in real-time, and it must be ephemeral, i.e., not persist in the system. While it is preferable to use a query language to express complex data-handling lo...
Technical Report
In modern application areas for software systems-like eHealth, the Internet-of-Things, and Edge Computing-data is encoded in heterogeneous, tree-shaped data-formats, it must be processed in real-time, and it must be ephemeral, i.e., not persist in the system. While it is preferable to use a query language to express complex data-handling logics, th...
Chapter
Microservices are highly modular and scalable Service Oriented Architectures. They underpin automated deployment practices like Continuous Deployment and Autoscaling. In this paper we formalize these practices and show that automated deployment — proven undecidable in the general case — is algorithmically treatable for microservices. Our key assump...
Preprint
Full-text available
Serverless computing, also known as Functions-as-a-Service, is a recent paradigm aimed at simplifying the programming of cloud applications. The idea is that developers design applications in terms of functions, which are then deployed on a cloud infrastructure. The infrastructure takes care of executing the functions whenever requested by remote c...
Preprint
Microservices are highly modular and scalable Service Oriented Architectures. They underpin automated deployment practices like Continuous Deployment and Autoscaling. In this paper, we formalize these practices and show that automated deployment - proven undecidable in the general case - is algorithmically treatable for microservices. Our key assum...
Preprint
Full-text available
Network Function Virtualization (NFV) and Software Defined Networking (SDN) are technologies that recently acquired a great momentum thanks to their promise of being a flexible and cost-effective solution for replacing hardware-based, vendor-dependent network middleboxes with software appliances running on general purpose hardware in the cloud. Del...
Chapter
Full-text available
Over the years, organizations acquired disparate software systems, each answering one specific need. Currently, the desirable outcomes of integrating these systems (higher degrees of automation and better system consistency) are often outbalanced by the complexity of mitigating their discrepancies. These problems are magnified in the decentralized...
Chapter
Choreographic Programming is a paradigm for distributed programming, where high-level “Alice and Bob” descriptions of communications (choreographies) are used to synthesise correct-by-construction programs. However, implementations of choreographic models use message routing technologies distant from their related theoretical models (e.g., CCS/ Ope...
Conference Paper
The Internet of Things (IoT) promotes the communication among heterogeneous entities, from small sensors to Cloud systems. However, this is realized using a wide range of communication media and data protocols, usually incompatible with each other. Thus, IoT systems tend to grow as homogeneous isolated platforms, which hardly interact. To achieve a...
Chapter
Full-text available
Microservices is an architectural style inspired by service-oriented computing that has recently started gaining popularity. Before presenting the current state-of-the-art in the field, this chapter reviews the history of software architecture, the reasons that led to the diffusion of objects and services first, and microservices later. Finally, op...
Article
Full-text available
Mobility-as-a-Service (MaaS) applies the everything-as-a-service paradigm of Cloud Computing to transportation: a MaaS provider offers to its users the dynamic composition of solutions of different travel agencies into a single, consistent interface. Traditionally, transits and data on mobility belong to a scattered plethora of operators. Thus, we...
Chapter
Full-text available
Microservices is an architectural style inspired by service-oriented computing that has recently started gaining popularity. Before presenting the current state-of-the-art in the field, this chapter reviews the history of software architecture, the reasons that led to the diffusion of objects and services first, and microservices later. Finally, op...
Chapter
Microservices is an architectural style inspired by service-oriented computing that has recently started gaining popularity. Before presenting the current state-of-the-art in the field, this chapter reviews the history of software architecture, the reasons that led to the diffusion of objects and services first, and microservices later. Finally, op...
Conference Paper
Full-text available
—Mobility as a Service (MaaS) applies the everything-as-a-service paradigm of Cloud Computing to transportation: a MaaS provider offers to its users the dynamic composition of solutions of different travel agencies into a single, consistent interface. Traditionally, transits and data on mobility belong to a scattered plethora of operators. Thus, we...
Chapter
Full-text available
Microservices is an architectural style inspired by service-oriented computing that has recently started gaining popularity. Before presenting the current state-of-the-art in the field, this chapter reviews the history of software architecture, the reasons that led to the diffusion of objects and services first, and microservices later. Finally, op...
Article
Full-text available
Programming distributed applications free from communication deadlocks and race conditions is complex. Preserving these properties when applications are updated at runtime is even harder. We present a choreographic approach for programming updatable, distributed applications. We define a choreography language, called Dynamic Interaction-Oriented Ch...
Article
Full-text available
Mobility as a Service (MaaS) applies the everything-as-a-service paradigm of Cloud Computing to transportation: a MaaS provider offers to its users the dynamic composition of solutions of different travel agencies into a single, consistent interface. Traditionally, transits and data on mobility belong to a scattered plethora of operators. Thus, we...
Conference Paper
Mobility as a Service takes the concept of XaaS to transportation: a MaaS provider shall merge transport options from different mobility providers, seamlessly handling the whole experience of traveling, from providing information, to travel planning, and payments handling. To effectively support the creation of a market of MaaS providers, we envisi...
Chapter
Full-text available
The microservice architecture is a style inspired by service-oriented computing that has recently started gaining popularity. Before presenting the current state-of-the-art in the field, this chapter reviews the history of software architecture, the reasons that led to the diffusion of objects and services first, and microservices later. Finally, o...
Article
Full-text available
The microservice architecture is a style inspired by service-oriented computing that has recently started gaining popularity. Before presenting the current state-of-the-art in the field, this chapter reviews the history of software architecture, the reasons that led to the diffusion of objects and services first, and microservices later. Finally, o...
Thesis
Since the early days of the Internet, distributed software applications have become one of the leading forces behind the development and economic growth of our society. Nonetheless, the practice of programming distributed systems is one of the most error-prone. Developers strive to correctly implement separate components that, put together, enact a...
Chapter
Microservices is an emerging paradigm for the development of distributed systems that, originating from Service-Oriented Architecture, focuses on the small dimension, the loose coupling, and the dynamic topology of services. Microservices are particularly appropriate for the development of distributed systems in the Cloud. However, their dynamic na...
Article
Full-text available
Choreographic Programming is a methodology for the development of concurrent software based on a correctness-by-construction approach which, given a global description of a system (a choreography), automatically generates deadlock-free communicating programs via an EndPoint Projection (EPP). Previous works use target-languages for EPP that, like th...
Conference Paper
Programming distributed applications free from communication deadlocks and races is complex. Preserving these properties when applications are updated at runtime is even harder. We present DIOC, a language for programming distributed applications that are free from deadlocks and races by construction. A DIOC program describes a whole distributed ap...
Article
Full-text available
Application Programming Interfaces (APIs) are a standard feature of any application that exposes its functionalities to external invokers. APIs can be composed thus obtaining new programs with new functionalities. However API composition easily becomes a frustrating and time-costly task that hinders API reuse. The issue derives from technology-depe...
Article
Full-text available
In Service-Oriented Architectures (SOA) services are composed by coordinating their communications into a flow of interactions. Coloured Petri nets (CPN) offer a formal yet easy tool for modelling abstract SOAs. Still, mapping abstract SOAs into executable ones requires a non-trivial and time-costly analysis. Here, we propose a methodology that map...
Article
We develop a methodology for verifying distributed, adaptive software systems.•The cornerstone of our framework is the use of choreography languages.•We integrate also different techniques based on abstract interpretation and on dynamic verification.
Article
Full-text available
Proving deadlock freedom for distributed applications is complex. It becomes even harder if those applications dynamically adapt to face needs which were unexpected when the application was deployed or even started. We present a framework ensuring this key property by construction. Our framework includes a language called Adaptive Interaction-Orien...
Conference Paper
Full-text available
We present AIOCJ, a framework for programming distributed adaptive applications. Applications are programmed using AIOC, a choreographic language suited for expressing patterns of interaction from a global point of view. AIOC allows the programmer to specify which parts of the application can be adapted. Adaptation takes place at runtime by means o...
Article
Full-text available
In Service-Oriented Architectures (SOA), services are composed by coordinating their communications into a flow of interactions. Coloured Petri nets (CPN) offer a formal yet easy tool for modelling interactions in SOAs, however mapping abstract SOAs into executable ones requires a non-trivial and time-costly analysis. Here, we propose a methodology...

Network

Cited By

Projects

Projects (4)
Project
The Assessment on the Status of CyberSecurity in Denmark (ASCD) is a research project conducted by the IT University of Copenhagen and the University of Southern Denmark and funded by the Danish Centre for CyberSecurity. The project aims to study and report on the existing cybersecurity and privacy protection practices used in large Danish companies and SMEs, identifying the most important challenges the developers in Denmark face in developing secure and privacy-preserving solutions, and providing guidelines for securing critical infrastructures. For more information, see https://ascd.dk.