MZA

DESK System is iteo’s original solution, modified according to the client’s needs.
It enabled us to create the Dispatcher Communication System, a key IT-telecom used by Miejskie Zakłady Autobusowe (Public Transport Authority) in Warsaw.

Project has started by winning public proceedings (73/PN/AB/20) announced in August 2020 by MZA, a municipal entity in the ZTM group belonging to the City of Warsaw.

Project’s main goals:

Programming languages:

Server technologies:

Technologies and client libraries:

Message broker and databus:

Databases:

Reliability

In order to ensure highest possible availability and eliminate single points of failure, we used Load Balancer with a floating IP mechanism which, in case of failure, redirects the traffic from the active server to the backup one.

Thanks to clustering, the telephone switchboard allows both telephone and radio connections to still be operated by the central backup server when the main server is damaged or temporarily unavailable.

Capability

We reduced the number of necessary database queries thanks to the use of persistence mechanism in cache memory in the PBX Proxy system cooperating with the telephone central. Thereby time for the systems capability operations handling calls and conferences was reduced as well.

As a part of the main application system, the most important business efficiency entities are stored using the InMemory database. It allowed us to minimize the time of performing the most demanding operations related to conference management, and reduce the risk of losing information about the current state of these entities using database clustering.

Scalability

Extracting the low-level logic related to integration with the PBX into a separate PBX Proxy system allowed us to design the application in stateless architecture, enabling its scalability without losing performance as the number of application instances grows.

Interoperability

Designing the application to unify multiple types of connections allowed us to integrate with radio adapters, thanks to which the system enables handling both telephone and radio calls.

It’s also possible to send SMS messages via the dispatcher panel. Thanks to the design of the system open to new integrations, the current GSM gateway can be replaced with another gateway that can handle such messages.

The solution is also fully open to integration with other external systems, including client’s dedicated ones.

The usability project featured creating a console for the dispatcher. The interface was designed for touch screens with resolution determined by the Client.

Special requirements included in the project:

Graphic interface project featured preparing a complex Design System used as a base to style all product views created by UX Team.

We designed custom side navigation icons along with an automated reusable components system, based on variants and autolayouts. Whole project was well-thought to assure maximum readability and 100% of available space on the screen.

The biggest challenge was adjusting the size of text and color style so that every view was intuitive and functional in everyday use.

The DESK system for MZA is an example of a project, in which the tester is involved in the software development process from the earliest stage of work. Starting from the requirements analysis, where the planned system functionalities were verified, through ongoing implementation correctness testing, the entire production process, to regression tests and support for customer acceptance tests.

The project was based on extensive ,”OPZ” documentation including a set of functionalities indicated by the client, which was the so-called test oracle. It is worth mentioning that the precise requirements, a wide range of functionalities and the dynamics of changes required a large commitment from the tester, as well as frequent regression tests to verify full functional and operational efficiency of the system. It was essential to ensure the correct operation of the functionality of the developed software, with particular emphasis on the verification of its operation for a dedicated touch screen, mobile radio and headset.

In order to verify the correctness of the functionality we analyzed the client’s documentation, requirements andreal and highly complex test cases. We performed:

We also secured the activities allowed for the user during connection handling and designed acceptance tests scenarios and submitted them for the client’s verification.

The developed system is always fully available, ensures continuity and multithreaded communication. It guarantees reliability and safety.