Drools is a hybrid rule engine, allowing both data-driven forward chaining (rules match facts in the working memory producing other facts that in turn activate other rules) and goal-driven backward chaining (queries match facts in the working memory, eventually invoking other queries to retrieve them). This second usage pattern is also available in streaming modeRead more →
Decision Model and Notation (DMN) is designed to catch the crucial business logic which affects decisions. It’s not meant to be a replacement for a general purpose programming language. FEEL is a powerful expression, but it is on purpose designed to be an expression language and not an imperative language to avoid bringing in theRead more →
In this post I want to share an interesting use case of data enrichment, using DMN with BPMN and other open standards. The typical usage pattern for data enrichment is the following: a complex data structure containing several attributes is provided as input; based on some computations and decision results, the original structure is enrichedRead more →
As part of our effort to make Kogito usable in an event-driven fashion, this article introduces a new addon: the event-driven rules addon. It is available since Kogito v1.12.0 and its behavior resembles what the event-driven decisions addon (presented here) already does for decisions. Key concepts The new addon enables the evaluation of DRL ruleRead more →
In my last post I described the principles guiding the design of the new programmatic API. As I promised last time, in this blog post I would like to give an overview of new API capabilities that this new design would enable. One downside of having an API that is tightly-coupled with the implementation ofRead more →
Introducing Smart Scroll Creating and managing BPMN/DMN resources can be a daunting task. Projects can come in many shapes and sizes and with varying levels of complexity. Consequently, being able to locate and identify nodes is of utmost importance. Focusing on easing the load of such demands, we introduce Smart Scroll for BPMN/DMN editors. AvailableRead more →
Apache Camel is an Open Source integration framework that supports the implementation of the Enterprise Integration patterns (EIP). The Message Filter EIP allows you to eliminate undesired messages from a channel based on a set of criteria. The pattern uses a predicate to decide if the messages should be dropped or not. Oftentimes the predicateRead more →
Drools community discusses various usage, issues and questions on google group (https://groups.google.com/g/drools-usage , https://groups.google.com/g/drools-setup) and zulip chat (https://kie.zulipchat.com/#narrow/stream/232677-drools) daily basis. When we discuss the usage of a specific feature or syntax (for example, "accumulate"), our documentation (https://docs.jboss.org/drools/release/latest/drools-docs/html_single/) is the best resource but there may be cases where users stumble when they try a little different thing fromRead more →
In the previous post we showed how to use our fancy new Public API, but I threatened promised you we would get back to the design rationale. So, here we are. This blog post is rather long, so I decided to break down into two parts. It is loosely based on the presentation I gaveRead more →
In this article we’ll introduce you to a powerful feature of Drools, CEP (Complex Event Processing) To understand the context, let me introduce the idea about real time computing, a specific branch of computing in which the response of the system is a key component of the result. In other terms, in a real-time systemRead more →
