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Developer(s) | Red Hat |
---|---|
Stable release | 8.44.0.Final / September 5, 2023 [1] |
Repository | |
Written in | Java |
Operating system | Cross-platform |
Type | Rules engine |
License | ASL 2 |
Website | www |
Drools is a business rule management system (BRMS) with a forward and backward chaining inference-based rules engine, more correctly known as a production rule system, using an enhanced implementation of the Rete algorithm.
Drools supports the Java Rules Engine API (Java Specification Request 94) standard for its business rule engine and enterprise framework for the construction, maintenance, and enforcement of business policies in an organization, application, or service.
Drools, as part of the Kie Community [2] has entered Apache Incubator in January, 2023. [3]
Red Hat Decision Manager (formerly Red Hat JBoss BRMS [4] ) is a business rule management system and reasoning engine for business policy and rules development, access, and change management. [5] JBoss Enterprise BRMS is a productized version of Drools with enterprise-level support available. JBoss Rules is also a productized version of Drools, but JBoss Enterprise BRMS is the flagship product. [6]
Components of the enterprise version: [7]
Drools and Guvnor are JBoss Community open source projects. As they are mature, they are brought into the enterprise-ready product JBoss Enterprise BRMS.
Components of the JBoss Community version: [10]
This example [11] illustrates a simple rule to print out information about a holiday in July. It checks a condition on an instance of the Holiday
class, and executes Java code if that condition is true.
rule"validate holiday"when$h1 : Holiday( month == "july" ) thenSystem.out.println($h1.name + ":" + $h1.month); end
The purpose of dialect "mvel
" is to point the getter and setters of the variables of your Plain Old Java Object (POJO) classes. Consider the above example, in which a Holiday
class is used and inside the circular brackets (parentheses) "month
" is used. So with the help of dialect "mvel
" the getter and setters of the variable "month
" can be accessed.
Dialect "java
" is used to help us write our Java code in our rules. There is one restriction or characteristic on this. We cannot use Java code inside the "when" part of the rule but we can use Java code in the "then" part.
We can also declare a Reference variable $h1
without the $
symbol. There is no restriction on this. The main purpose of putting the $
symbol before the variable is to mark the difference between variables of POJO classes and Rules.
Red Hat, Inc. is an American software company that provides open source software products to enterprises and is a subsidiary of IBM. Founded in 1993, Red Hat has its corporate headquarters in Raleigh-Durham, North Carolina, with other offices worldwide.
Jess is a rule engine for the Java platform that was developed by Ernest Friedman-Hill of Sandia National Labs. It is a superset of the CLIPS programming language. It was first written in late 1995. The language provides rule-based programming for the automation of an expert system, and is frequently termed as an expert system shell. In recent years, intelligent agent systems have also developed, which depend on a similar capability.
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An application server is a server that hosts applications or software that delivers a business application through a communication protocol. For a typical web application, the application server sits behind the web servers.
A web container is the component of a web server that interacts with Jakarta Servlets. A web container is responsible for managing the lifecycle of servlets, mapping a URL to a particular servlet and ensuring that the URL requester has the correct access-rights. A web container handles requests to servlets, Jakarta Server Pages (JSP) files, and other types of files that include server-side code. The Web container creates servlet instances, loads and unloads servlets, creates and manages request and response objects, and performs other servlet-management tasks. A web container implements the web component contract of the Jakarta EE architecture. This architecture specifies a runtime environment for additional web components, including security, concurrency, lifecycle management, transaction, deployment, and other services.
A business rules engine is a software system that executes one or more business rules in a runtime production environment. The rules might come from legal regulation, company policy, or other sources. A business rule system enables these company policies and other operational decisions to be defined, tested, executed and maintained separately from application code.
A BRMS or business rule management system is a software system used to define, deploy, execute, monitor and maintain the variety and complexity of decision logic that is used by operational systems within an organization or enterprise. This logic, also referred to as business rules, includes policies, requirements, and conditional statements that are used to determine the tactical actions that take place in applications and systems.
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JBoss Developer Studio (JBDS) is a development environment created and currently developed by JBoss and Exadel.
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JBoss Operations Network is free software/open-source Java EE-based network management software. JBoss Operations Network is part of the JBoss Enterprise Middleware portfolio of software. JBoss ON is an administration and management platform for the development, testing, deployment, and monitoring of the application lifecycle. Because it is Java-based, the JBoss application server operates cross-platform: usable on any operating system that supports Java. JBoss ON was developed by JBoss, now a division of Red Hat.
The JBoss Enterprise SOA Platform is free software/open-source Java EE-based service-oriented architecture (SOA) software. The JBoss Enterprise SOA Platform is part of the JBoss Enterprise Middleware portfolio of software. The JBoss Enterprise SOA Platform enables enterprises to integrate services, handle business events, and automate business processes, linking IT resources, data, services and applications. Because it is Java-based, the JBoss application server operates cross-platform: usable on any operating system that supports Java. The JBoss SOA Platform was developed by JBoss, now a division of Red Hat.
The JBoss Enterprise Application Platform is a subscription-based/open-source Java EE-based application server runtime platform used for building, deploying, and hosting highly-transactional Java applications and services developed and maintained by Red Hat. The JBoss Enterprise Application Platform is part of Red Hat's Enterprise Middleware portfolio of software. Because it is Java-based, the JBoss application server operates across platforms; it is usable on any operating system that supports Java. JBoss Enterprise Application Platform was originally called JBoss and was developed by the eponymous company JBoss, acquired by Red Hat in 2006.
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