Imixs-Workflow 5.2 Supports Asynchronous Events

With the new release v5.2.0, the open source workflow engine Imixs-Workflow now supports the asynchronous execution of BPMN events.

This feature is a big step forward especially in a microservice architecture. The new so called AsyncEvents make it much more easier to decouple a Rest API call from the processing life cycle of the workflow engine. In this way the request-response pattern shows better performance and allows a very clear design of complex business processes.

The AsyncEvents were already part of the Imixs-Microservice project in a pre-release and become now a core feature of the Imixs-Workflow engine. Especially in more complex architectures, the use of the so-called SAGA Pattern is an important building block. With asynchronous events Imixs-Workflow is now supporting this design pattern as a core feature. Read also our blog about building powerful microservice solutions with the SAGA Pattern.

Microservice Saga Pattern with Imixs-Workflow

In my last blog I explained the core concepts behind the Microservice Saga Pattern. In this blog I will address the problem from a more practical perspective by demonstrating how Imixs-Workflow can be used as a Saga Orchestrator within a Microservice architecture. First, I would like to give a brief review of the main concepts of the saga pattern. Later I show some implementation examples.

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Cloud Native and Business Transactions

Everyone is talking about cloud technologies and of course every modern project relies on a microservice architecture. A variety of technologies and methods contribute to the success of this architecture pattern. But what does cloud native actually mean for the business world? How do companies and organizations implement business processes successfully beyond the big technology promises?

The basic idea of a microservice architecture is to break down the technical requirements of a software system into the smallest possible and therefore manageable services. The advantage: services created in this way can be developed independently of each other with different technologies by different teams. At the same time, we see new methods and technologies to connect, monitor and scale these services.

But just looking at the technology does’t mean that software can be developed faster and better. I would therefore like to compare some of these methods and technologies from the microservice architecture with the requirements for the development of business applications.

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Imixs-Workflow – Version 5.0.2 Released

Today we released version 5.0.2 of the Open Source Workflow Engine Imixs-Workflow.

The new release includes – beside the general new support of Eclipse Microprofile – some important new features. The main feature of this release is a new implementation of Imixs Adapter API. This API supports now two kinds of adapter interfaces.

  • The SignalAdapter can be used to implement a fine grained control of the event processing life cycle.
  • The GenericAdapter interface provides a model independent extension point to implement generic API features.

One of the first implementations is the new AccessAdapter class. This adapter controls the ACL defined by the Imixs-BPMN Model definition. This adapter can also be a good starting point of custom generic adapters.

Together with the Imixs Plugin API the Adapter API now provides developers with a strong and flexible extension mechanism to implement all kind of human-centric and microservice based workflow applications.

Hexagonal Architecture in Imixs-Workflow

The hexagonal architecture is a design pattern introduced by Dr. Alistair Cockburn.
A hexagon is a closed body and according to his pattern, an application is assumed to be a hexagon. Whatever is relevant to the business logic of an application gets to reside inside the hexagon and the rest is arranged outside. In this way, the business logic can be easily tested without worrying too much about external factors. So and this matches perfectly into the world of microservices.

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