Design and implementation of a flexible RBAC-service in an object-oriented scripting language

Ruby - an Object-Oriented scripting language - is used world-wide because of its ease of use. However, the current interpreter is slow. To solve this problem, some virtual machines were developed, but none with adequate performance or functionality. To fill this gap, I have developed a Ruby interpreter called YARV (Yet Another Ruby VM). YARV is based on a stack machine architecture and features optimizations for high speed execution of Ruby programs. In this poster, I introduce the Ruby programming language, discuss certain characteristics of Ruby from the aspect of a Ruby interpreter implementer, and explain methods of implementation and optimization. Benchmark results are given at the end.

Object-oriented scripting languages like Javascript and Python are popular partly because of their dynamic features. These include the runtime modification of objects and classes through addition of fields or updating of methods. These features make static typing difficult and so usually dynamic typing is used. Consequently, errors such as access to non-existent members are not detected until runtime.We first develop a formalism for an object based language, JS0 with features from Javascript, including dynamic addition of fields and updating of methods. We give an operational semantics and static type system for JS0using structural types. Our types allow objects to evolve in a controlled manner by classifying members as definite or potential.We define a type inference algorithm for JS0 that is sound with respect to the type system. If the type inference algorithm succeeds, then the program is typeable. Therefore, programmers can benefit from the safety offered by the type system, without the need to write explicitly types in their programs.

<p> Due to the great freedom in contemporary structural design, conventional design techniques cannot be applied to all spatial compositions and new materials. Widely available CAE software often tries to automate more common check methods found in (inter)national norms, but does not provide universal solutions. The complexity of modern structures, while economical and aesthetically appealing, requires that the engineer often write his/her own checks or perform manual calculations.</p><p> Design Forms (SDF) is a new software technology that enables the easy, on-the-fly writing of customised engineering algorithms and design checks by means of simplified programming. The application uses a C#-based, object-oriented scripting language, and is furnished with an intuitive UI, a full set of mathematical and logical operators, possibilities to include text and graphical descriptions, tables, charts and extensive reports. Built-in toolboxes with engineering formulae and libraries help the user-developer create standalone solutions that can be reused, shared, sold commercially, and linked to CAE software where advanced GUI and 3D visualisation possibilities may be used while pre- and post-processing. This paper presents the SDF tool and illustrates its use by means of practical examples of structural design and detailing.</p>

Dynamic segmentation is commonly viewed as one of the most effective aspects of GIS for transportation applications. To date, much of this effort has focused on relational data models, with object data models receiving far less attention. This paper presents an object model that provides a natural representation of dynamically segmented features by extending the Object Database Management Group (ODMG) standard with a special mechanism, called parametric polymorphism. This mechanism supports the shifting of a conventional data type into a linear type to maintain knowledge about events (e.g. pavement condition, traffic volumes and traffic accidents) that change spatially along linear features. An associated object query language unavailable in current GIS packages is also provided for data analyses relevant to dynamic segmentation. The model and query language have been implemented using an object-oriented scripting language in a GIS environment.

Dynamic type-checking and object-oriented programming often go hand-in-hand; scripting languages such as Python, Ruby, and JavaScript all embrace object-oriented (OO) programming. When scripts written in such languages grow and evolve into large programs, the lack of a static type discipline reduces maintainability. A programmer may thus wish to migrate parts of such scripts to a sister language with a static type system. Unfortunately, existing type systems neither support the flexible OO composition mechanisms found in scripting languages nor accommodate sound interoperation with untyped code. In this paper, we present the design of a gradual typing system that supports sound interaction between statically- and dynamically-typed units of class-based code. The type system uses row polymorphism for classes and thus supports mixin-based OO composition. To protect migration of mixins from typed to untyped components, the system employs a novel form of contracts that partially seal classes. The design comes with a theorem that guarantees the soundness of the type system even in the presence of untyped components.

Core FOBS: A hybrid functional and object-oriented language

General Information Quick Overview This chapter is not a comprehensive manual of Python. Its sole aim is to provide sufficient information to give you a good start if you are unfamiliar with Python. If you know another computer language, and presumably you do, it is not difficult to pick up the rest as you go. Python is an object-oriented language that was developed in late 1980s as a scripting language (the name is derived from the British television show Monty Python's Flying Circus). Although Python is not as well known in engineering circles as some other languages, it has a considerable following in the programming community—in fact, Python is considerably more widespread than Fortran. Python may be viewed as an emerging language, since it is still being developed and refined. In the current state, it is an excellent language for developing engineering applications—it possesses a simple elegance that other programming languages cannot match. Python programs are not compiled into machine code, but are run by an interpreter . The great advantage of an interpreted language is that programs can be tested and debugged quickly, allowing the user to concentrate more on the principles behind the program and less on programming itself. Since there is no need to compile, link and execute after each correction, Python programs can be developed in a much shorter time than equivalent Fortran or C programs.

The management and booking of Rooms in hotels is a tedious and complicated task especially if it is done manually. Keeping track of large customers and all their details requires an inordinate space for file cabinets, not to mention the time the hotel administrator would spend going back and forth to file cabinets so as to look up each customer’s information. This is why a good hotel reservation system is needed to make this task as easy as possible. This paper shows how the noted complicated human task can be solved by using a database Management System together with scripting and programming languages like Html and PHP respectively as the key tools in the development of a hotel reservation System. The system was developed using the object-oriented software development approach which includes the use of object-oriented analysis, object- oriented design and object-oriented programming. This was done so that the developed software can be maintainable, reliable and scalable. Keywords: reservation, management, system DOI : 10.7176/JIEA/9-3-01 Publication date :May 31 st 2019

The management and booking of Rooms in hotels is a tedious and complicated task especially if it is done manually. Keeping track of large customers and all their details requires an inordinate space for file cabinets, not to mention the time the hotel administrator would spend going back and forth to file cabinets so as to look up each customer’s information. This is why a good hotel reservation system is needed to make this task as easy as possible. This paper shows how the noted complicated human task can be solved by using a database Management System together with scripting and programming languages like Html and PHP respectively as the key tools in the development of a hotel reservation System. The system was developed using the object-oriented software development approach which includes the use of object-oriented analysis, object- oriented design and object-oriented programming. This was done so that the developed software can be maintainable, reliable and scalable. Keywords: reservation, management, system DOI : 10.7176/CEIS/10-4-05 Publication date :May 31 st 2019

Lua is a scripting language used in many industrial applications, with an emphasis on embedded systems and games. Two key points in the design of the language that led to its widely adoption are flexibility and small size. To achieve these two conflicting goals, the design emphasizes the use of few but powerful mechanisms, such as first-class functions, associative arrays, coroutines, and reflexive capabilities. As a consequence of this design, although Lua is primarily a procedural language, it is frequently used in several different programming paradigms, such as functional, object-oriented, goal-oriented, and concurrent programming, and also for data description.In this paper we discuss what mechanisms Lua features to achieve its flexibility and how programmers use them for different paradigms.KeywordsFunctional ProgrammingConcurrent ProgrammingTuple SpaceAlternative GoalProcedural LanguageThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

As an object-oriented dynamic scripting language, Python has been widely applied in scientific computation, image processing and network communication fields, etc.However, there is no enough attention paid to it in automated test.A Python-based client/server auto-dial testing mode, which is successfully applied in actual wireless network optimization testing, is introduced.The actual application shows that this mode brings flexible and high-efficiency features of Python programming into full play and significantly improves the efficiency of testing system.