20.500.12556/RUL-187359 Razvoj mikrostoritvene aplikacije z ogrodjem Quarkus in s sporočilnim sistemom NATS JetStream Development of a microservices application using the Quarkus framework and the NATS JetStream messaging system V mikrostoritveni arhitekturi poslovni proces pogosto sega prek meja ene same storitve. Klic, ki je bil v enoviti aplikaciji navaden klic metode, tedaj postane omrežna komunikacija, s čimer se odpreta vprašanji zanesljivosti in usklajenosti podatkov. V diplomskem delu smo z ogrodjem Quarkus in sporočilnim sistemom NATS JetStream izdelali sistem za souporabo vozil, v katerem rezervacija spreminja stanje vozila v drugi storitvi. Storitve so podatkovno avtonomne in komunicirajo sinhrono prek vmesnikov REST ter asinhrono z dogodki. S poskusom smo preverili obnašanje sistema ob izpadu storitve, ki dogodke prevzema. Poskus je pokazal, da so bila po ponovnem zagonu obdelana vsa sporočila, vendar ne v vrstnem redu objave, zaradi česar je vozilo ostalo v napačnem stanju. Ugotovili smo, da porabnik, ki nastavlja absolutno ciljno stanje, sicer prenese podvojeno dostavo, ni pa neodvisen od vrstnega reda. Težavo smo odpravili tako, da v vozilo zapišemo doseženo stopnjo življenjskega cikla rezervacije; porabnik na tej podlagi prezgodnji dogodek zavrne in ga prepusti ponovni dostavi. Po popravku sistem konvergira v pravilno stanje tudi ob najbolj neugodnem zaporedju obdelave. In a microservice architecture a business process often crosses the boundaries of a single service. What used to be a method call in a monolithic application becomes network communication, which raises questions of reliability and data consistency. This thesis presents a car sharing system built with the Quarkus framework and the NATS JetStream messaging system, in which a booking changes the state of a vehicle owned by another service. The services are data autonomous and communicate both synchronously over REST interfaces and asynchronously through events. We tested the system’s behaviour while the consuming service was down. The experiment showed that all messages were processed after the restart, but not in the order in which they had been published, leaving the vehicle in an incorrect state. We found that a consumer setting an absolute target state tolerates duplicate delivery but is not independent of ordering. We addressed this by recording the booking lifecycle stage reached so far, on the basis of which a consumer rejects a premature event and leaves it to redelivery. After the fix the system converges to the correct state even under the least favourable processing order. mikrostoritve Quarkus NATS JetStream sporočilni sistem asinhrona komunikacija Java microservices Quarkus NATS JetStream messaging system asynchronous communication Java true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-09-10 11:35:22 2026-09-10 11:35:28 2026-09-25 06:51:13 0000-00-00 00:00:00 2026 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 39016 292438275 Aubersek_Matjaz_-_Razvoj_mikrostoritvene_aplikacije_z_ogrodjem_Quarkus_in_s_sporocilnim_sistemom.pdf Aubersek_Matjaz_-_Razvoj_mikrostoritvene_aplikacije_z_ogrodjem_Quarkus_in_s_sporocilnim_sistemom.pdf 1 87CFA5D9BDA37FF3118DDCD96E9F2BAF a5bac575af09fcf9658e7c2ac35739b740c0d85127ace2a8d387be3c4532306e ef27d1ce-acfa-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=246974 Fakulteta za računalništvo in informatiko 0 0 0