This article will check some of the most popular rule engines in Java. Rule engine makes it easy to separate business logic from source code. We may view a rule engine as a sophisticated if/then statement interpreted by an expert system. In Java, most of the popular rule engines implement JSR94.
It is an expert-system program that runs the rules on the data and if any condition matches, it executes the corresponding actions
This follows a basic approach; the “Human Expert defines the rule sets”. Then when the user requests any data/query, it goes to the rules engine interface, where it processes the request data and then gets the output/response from the ruleset files.
In the Java world, most of the rule engines are written in Java and many of these rule engines follow the JSR94 standard. Here is the list of Rule Engine
Find details here.
Java Configuration
Maven Dependency <dependency> <groupId>org.drools</groupId> <artifactId>drools-decisiontables</artifactId> <version>${drools-version}</version> </dependency> <dependency> <groupId>org.drools</groupId> <artifactId>drools-core</artifactId> <version>${drools-version}</version> </dependency> <dependency> <groupId>org.drools</groupId> <artifactId>drools-compiler</artifactId> <version>${drools-version}</version> </dependency>
This is an in-memory file system provided by the framework, we set the path of the file to read and initialize.
Next, we need to set the KieContainer, a placeholder for all the KieBases for a particular KieModule. KieContainer is built with the help of other beans, including KieFileSystem, KieModule, and KieBuilder
The rules are fired by opening a KieSession bean – which can be retrieved from KieContainer.
We hope you enjoyed our article about Drools, Java’s most advanced rule engine. We know that this post will be helpful to you if you’re looking to build a business system using Java. So what are you waiting for?
This Blog was written by all the members of the Mindbowser mobility team and modified by the Mindbowser Content team for publication purposes.
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