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Tango V8 – An Implementation of Microservices ArchitectureV

This article is an introduction to TANGO version 8, a major upgrade that provides full microservice integration and complete Cloud capacities.

Lusis Payments


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Our broadly used Tango software is an implementation of a microservice architecture.  Tango was not initially designed to be “microservice”, it was more properly designed to implement a transactional, mission critical, Service Oriented Architecture “that works” (SOATW!). By “that works” I mean, performant, scalable, avoiding contentions and anarchic leeway and sustainable. It is clear that to make it sustainable, a SOA system must include major concepts: a data bus or universal messaging layer to anarchy (meaning the ability to define as many interfaces than relations between services) and a load-balancer in order to avoid contentions or stress points. Some state that these 2 concepts are the key differences between SOA and microservice. However, the definition of microservice is not so clear and sometimes it is nothing more than: “it is not a monolithic architecture”. So, the first thing we will do is define it, then we will outline what applies and what does not apply in Tango and finally we will present Tango v8.

What is a microservice architecture?
A microservice application is a collection of autonomous services, each of them doing one thing well and when combined, work together to provide a global service. Instead of a single complex system (monolithic architecture), the aim is to build and manage a set of relatively simple services that might interact in complex ways. These services collaborate with each other through a messaging protocol.

The idea is quite simple: Having a collection of little ships instead of a huge one. That metaphor is not totally wrong. Lots of little ships are easy to maneuver; if one is delayed the others can progress. However, you can quickly cover more space with your multiple ships and if one is sunk (bad feature, bad design…) the others can still fight. Of course, there are some intrinsic difficulties: first a light fleet requires more coordination; second it is not as easy to make it a robust battleship.

Anyway, microservices promise a better way to sustainably deliver business impact. Rather than a single monolithic unit, applications built using microservices are made up of loosely coupled, autonomous services. Building services that do one thing well avoids the inertia and entropy of large applications.

Properties of microservices are:

An exception to our design are the concepts (load balancer and Databus) that are introduced above, which are not accepted by all publications, however, the differences with SOA are more shades than key points. For instance, microservices are responsible for coordinating actions in a system while this can be external in SOA (complex orchestration can be externalized). Others say that Microservices design is driven by business and SOA design is driven by technique (technical layers…). This is an expert’s debate…

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Lusis Tango runs successfully on the HPE Nonstop.  Lusis Payments has several customers realizing huge performance advantages running Lusis Tango on the HPE Nonstop.  In addition, our systems are highly scalable and available which is imperative in the mission critical environment. Second, we are not realizing apps, projects or custom development. We are designing and developing software that has to be economically competitive. This means for instance, that all development must look like the others, be written in the same way, with the same style, as we can’t afford “specialist developer” for this work.  This is close to the CBSD model of development that I won’t expound upon here but to say it is fundamental in our development approach.


Philippe Preval, CEO Lusis Payments