Journal of Computer Sciences Institute

67-74

Authors: Wojciech Łasocha, Marcin Badurowicz

The aim of the author of this article is analyze the performance of WebSocket and HTTP protocol and their comparison. For this purpose, was used equipment working in a local network consisting of server, two client computers, switch and self-created research web application. Using a test application was measured time of data transfer between clients and server as well server and clients. The tests included transmission 100-character texts in specified number of copies considering speed of hardware (laptops) and software (web browsers). Additionally, was investigated the impact of overhead and TLS encryption to performance. The obtained results have illustrated in the form of charts, discussed and appropriate conclusions drawn.

81-88

Authors: Wojciech Stasiak, Mariusz Dzieńkowski

The accessibility of websites consists in ensuring the possibility of using the information posted there by all users, especially by disabled people. The aim of the study was to examine the levels of accessibility of websites of Lublin universities and compare them with the websites of two universities in Poland selected for the purpose of the study. With this aim in view, an experiment was developed, which consisted of two parts. In the first part of the experiment, a specially made original checklist was used containing questions about specific functionalities of websites corresponding to important accessibility issues. In the second part, automated tools were used to with a view to assessing the accessibility. The research material consisted of eight websites of universities from Lublin and two websites of universities from other cities in Poland that were compared in the study. Those two universities in contrast to the eight ones additionally had special sets of websites for people with disabilities. Such additional sets of websites specifically designed for the needs of people with disabilities were also included in the research. After conducting the experiment, it was possible to identify the universities which have the best and the worst websites in terms of accessibility results. Furthermore, the study revealed specific pages of these websites that were characterized by the highest and the lowest average accessibility ratings. The results of the expert analysis showed that the examined university websites do not have an attached declaration of accessibility, contain documents in the PDF format that are not accessible, often do not allow for changes of colour and do not have a mobile version.

95-99

Authors: Marcin Górski, Wojciech Andrzej Piwowarski, Mariusz Dzieńkowski

The article presents a comparative analysis of popular ASP.NET Core MVC and Symfony 4 frameworks. Two web applications, containing the same functionalities and acting as a simple system for managing articles, were implemented in these technologies. The applications underwent time performance tests during typical operations performed by means of a simple form such as entering, editing, viewing and deleting data. These actions were performed automatically using commands from the Puppeteer library. The listed operations were repeated 10, 100 and 1,000 times in order to obtain precise mean times. On the basis of the obtained results, it was difficult to clearly state which of the compared programming tools is better. The ASP.NET Core MVC framework coped much better with two time-consuming operations, i.e. entering and editing data. Its results in this regard (the average from 1,000 repetitions) were respectively approximately 28% and 25% better compared to the Symphony 4 framework. However, for the two less time-consuming operations, i.e. displaying and deleting articles, the Symphony 4 framework proved to be considerably better. Its results with regard to displaying and deleting articles (the average for 1,000 measurements) were respectively 15% and 36% lower compared to the other of the tested frameworks.

107-113

Authors: Damian Gałan, Konrad Fisz, Piotr Kopniak

This publication presents a multi-criteria comparison of two mobile applications built with the use of Android and Flutter SDK. The former has been implemented with Kotlin and the latter with Dart. The benchmarking process examines factors such as execution time and CPU usage during data and disk operations. During the analysis, attention was paid to the length and volume the source code, community support and the availability of libraries. The comparative analysis shows that a mobile application written using Android SDK is often not only faster and more efficient, but also has greater community support and the number of libraries available. In addition, an analysis of the source code volume showed that Flutter has more concise but more difficult to navigate code than Android.

121-125

Authors: Marcin Grudniak, Mariusz Dzieńkowski

The aim of the work was to compare two technologies for creating server applications based on the JavaScript programming language. For the purposes of the research, two test applications were created. The first one was built on the basis of the Express programming framework and the second one on the basis of the Hapi framework. The client part of both applications was prepared using the React library. The client and server parts communicated with each other by means of REST API – the universal HTTP interface. The client application sent requests to the server application which then performed basic operations on the MongoDB basis and returned the result. As part of the work, an experiment consisting of four scenarios was developed. In each scenario, a different type of data was taken into consideration: a string of characters, an array, an object and an array of objects. The research focused on the efficiency aspect – measuring the response time of requests during GET, POST, PUT and DELETE operations. The tests were performed on two computers and the measurements were made in two ways: using a single code embedded in test applications and using the Postman tool. The obtained results, after averaging and analyzing them allowed for the conclusion that the Express framework proved to be more efficient than Hapi due to the shorter response time of requests. Only in the scenario where operations with large datasets were performed was the response time of requests at a similar level.

132-143

Authors: Łukasz Rutkowski, Piotr Kopniak

This paper analyzes possibility of using open-source tools to compile iOS frameworks in Linux operating system. The purpose of this analysis was to determine how compilation in Linux could be performed and identify possible limita- tions when using LLVM compiler. The analysis has been performed on own frameworks written using Objective-C and Swift languages containing graphic and text files in different formats and sizes. Results of the analysis show that compi- lation of iOS frameworks under Linux operating system is possible unless the compiler frameworks use interface com- ponents written in xib format for which there are no compilation tools available on Linux operating system.

144-150

Authors: Dmytro Salahor, Jakub Smołka

Classification of work’s subject area by keywords is an actual and important task. This article describes algorithms for classifying keywords by subject area. A model was developed using both algorithms and tested on test data. The results were compared with the results of other existing algorithms suitable for this tasks. The obtained results of the model were analysed. This algorithm can be used in real-life tasks.

159-164

Authors: Michał Błaszczyk, Marek Pucek, Piotr Kopniak

There are many frameworks available in the IT environment that differ in performance, security, complexity, and speed. The user who wants to start working with the selected framework should know whether it will meet the architectural requirements and business assumptions. The aim of this work is to compare the performance and complexity of web applications built using different lightweight frameworks for the Java language. Spring Boot, Micronaut, Quarkus and Javalin frameworks will be compared. At the beginning of the work, the main problems related to the creation of modern applications were discussed. In the following sections, basic analysis of the complexity of the syntax and conventions of the selected skeletons was performed. Then, experiments were conducted to compare performance - response and build times and memory consumption during application development and use. A wide cross-section of efficiency has been obtained in selected lightweight framework usages. The prepared comparison can be used to select the appropriate framework for the project.