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-\chapter{Summary}%
-\label{chp:summary}
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+The number of computers around us is growing exponentially, thus increasing the complexity of the systems in which they operate.
+Many of these computers are \emph{edge devices} operating in \gls{IOT} systems.
+Within these orchestras of computers, they interact with their environment using sensors and actuators.
+Edge devices often use cheap microcontrollers designed for embedded applications.
+They, therefore, have little memory, unhurried processors, and slow communication but are tiny and energy efficient.
+Programming \gls{IOT} systems is complex due to their dynamic, interactive, distributed, collaborative, multi-tiered, and multitasking nature.
+This is impeded even more by semantic friction that arises through different hardware and software characteristics between the tiers.
-\noindent%
-This is a summary of 350--400 words.
+A solution is found in \gls{TOP}.
+%A solution is found in the declarative programming paradigm \gls{TOP}.%, a declarative programming paradigm.
+In \gls{TOP}, the main building blocks are tasks, an abstract representation of work.
+During execution, the current value of the task is observable, and other tasks can act upon it.
+Collaboration patterns can be modelled by combinding and transforming tasks into compound tasks.
+From this declarative description of the work, a ready-for-work computer system is generated that guides the user in doing the work.
+An example of a \gls{TOP} system is \gls{ITASK}, a language for describing interactive web applications.
+Programming edge devices would benefit from \gls{TOP} as well.
+However, it is not straightforward to run \gls{TOP} systems on resource-constrained edge devices.
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+This dissertation shows how to orchestrate complete \gls{IOT} systems using \gls{TOP}.
+%
+First, I present advanced \gls{DSL} embedding techniques.
+Then \gls{MTASK} is shown, a \gls{TOP} \gls{DSL} for \gls{IOT} edge devices, embedded in \gls{ITASK}.
+Tasks are constructed and compiled at run time.
+This allows tasks to be tailor-made for the work that needs to be done.
+The compiled task is sent to the device for interpretation.
+For a device to be used in an \gls{MTASK} system, it needs to be programmed once with a lightweight domain-specific \gls{OS}.
+This \gls{OS} executes tasks in an energy-efficient way and automates all communication and data sharing.
+All aspects of the \gls{MTASK} system are shown: example applications, language design, implementation details, integration with \gls{ITASK}, and green computing facilities.
+When using \gls{MTASK} in conjunction with \gls{ITASK}, entire \gls{IOT} systems are programmed tierlessly from a single source, language, paradigm, high abstraction level, and type system.
+The dissertation concludes with a comparison between tierless programming, in particular in \gls{MTASK}, and traditional tiered programming.
+It shows that many problems such as semantic friction, maintainability, robustness, and interoperation safety are mitigated when using tierless programming.
+%This is a summary of 350--400 words.
+%\end{center}
\end{document}
repositories / phd-thesis.git / blobdiff