Drools github

Drools github DEFAULT

Chapter 3. Getting Involved

We are often asked "How do I get involved". Luckily the answer is simple, just write some code and submit it :) There are no hoops you have to jump through or secret handshakes. We have a very minimal "overhead" that we do request to allow for scalable project development. Below we provide a general overview of the tools and "workflow" we request, along with some general advice.

If you contribute some good work, don't forget to blog about it :)

3.1. Sign up to jboss.org

Signing to jboss.org will give you access to the JBoss wiki, forums and Jira. Go to http://www.jboss.org/ and click "Register".

3.2. Sign the Contributor Agreement

The only form you need to sign is the contributor agreement, which is fully automated via the web. As the image below says "This establishes the terms and conditions for your contributions and ensures that source code can be licensed appropriately"

https://cla.jboss.org/

3.3. Submitting issues via JIRA

To be able to interact with the core development team you will need to use JIRA, the issue tracker. This ensures that all requests are logged and allocated to a release schedule and all discussions captured in one place. Bug reports, bug fixes, feature requests and feature submissions should all go here. General questions should be undertaken at the mailing lists.

Minor code submissions, like format or documentation fixes do not need an associated JIRA issue created.

https://issues.jboss.org/browse/JBRULES (Drools)

https://issues.jboss.org/browse/JBPM

https://issues.jboss.org/browse/GUVNOR

With the contributor agreement signed and your requests submitted to jira you should now be ready to code :) Create a github account and fork any of the drools, jbpm or guvnor sub modules. The fork will create a copy in your own github space which you can work on at your own pace. If you make a mistake, don't worry blow it away and fork again. Note each github repository provides you the clone (checkout) URL, github will provide you URLs specific to your fork.

https://github.com/droolsjbpm

When writing tests, try and keep them minimal and self contained. We prefer to keep the drl fragments within the test, as it makes for quicker reviewing. If their are a large number of rules then using a String is not practical so then by all means place them in separate drl files instead to be loaded from the classpath. If your tests need to use a model, please try to use those that already exist for other unit tests; such as Person, Cheese or Order. If no classes exist that have the fields you need, try and update fields of existing classes before adding a new class.

There are a vast number of tests to look over to get an idea, MiscTest is a good place to start.

https://github.com/droolsjbpm/drools/blob/master/drools-compiler/src/test/java/org/drools/integrationtests/MiscTest.java

3.6. Commit with Correct Conventions

When you commit, make sure you use the correct conventions. The commit must start with the JIRA issue id, such as JBRULES-220. This ensures the commits are cross referenced via JIRA, so we can see all commits for a given issue in the same place. After the id the title of the issue should come next. Then use a newline, indented with a dash, to provide additional information related to this commit. Use an additional new line and dash for each separate point you wish to make. You may add additional JIRA cross references to the same commit, if it's appropriate. In general try to avoid combining unrelated issues in the same commit.

Don't forget to rebase your local fork from the original master and then push your commits back to your fork.

3.7. Submit Pull Requests

With your code rebased from original master and pushed to your personal github area, you can now submit your work as a pull request. If you look at the top of the page in github for your work area their will be a "Pull Request" button. Selecting this will then provide a gui to automate the submission of your pull request.

The pull request then goes into a queue for everyone to see and comment on. Below you can see a typical pull request. The pull requests allow for discussions and it shows all associated commits and the diffs for each commit. The discussions typically involve code reviews which provide helpful suggestions for improvements, and allows for us to leave inline comments on specific parts of the code. Don't be disheartened if we don't merge straight away, it can often take several revisions before we accept a pull request. Luckily github makes it very trivial to go back to your code, do some more commits and then update your pull request to your latest and greatest.

It can take time for us to get round to responding to pull requests, so please be patient. Submitted tests that come with a fix will generally be applied quite quickly, where as just tests will often way until we get time to also submit that with a fix. Don't forget to rebase and resubmit your request from time to time, otherwise over time it will have merge conflicts and core developers will general ignore those.

Sours: https://docs.jboss.org/drools/release/5.4.0.Final/droolsjbpm-introduction-docs/html/gettingstarted.html

How to change the Drools git repository from default

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Ram Mittala

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Jan 18, 2016, 1:49:54 AM1/18/16

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Hi,

I would like to used my own git repository to have the rules . Can you pls help to me find how to update the Drools workbench configuration to change the Git repository URL ?

Regards

Ram

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Michael Anstis

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Jan 18, 2016, 1:57:59 AM1/18/16

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Go to Administration Perspective and choose the Repository->Clone to clone an existing git repository or New for a new (empty) one.

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Gita Guntaka

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Jan 18, 2016, 9:59:33 PM1/18/16

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Hi ,

Thanks for reply , actually I am able to download my remote repository . Howerver , it is showing me as git://localhost:9418/uf-playground

How can I change the localhost to point my git url ?

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Michael Anstis

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Jan 18, 2016, 11:49:20 PM1/18/16

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Can you try rephrasing your issue?

If you clone an existing Repository using the Administration Perspective you'll get a new Repository with URL based on the name you gave it when cloning.

Unless you intentionally used "uf-playground" as your cloned repository name; the URL you show is that of the repository created automatically when deploying the Workbench.

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Gita Guntaka

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Jan 19, 2016, 9:46:53 PM1/19/16

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to Drools Setup

Hi Michael,

I am able to clone the repository form my git url and successfully cloned. 

However , after clone is done , it showing the URL as "git://localhost:9418/rule-engine" instead for my git url.

So that I am not able to sync the latest updates which are commit to git into Workbench ?

Regards

RAM


On Sunday, January 17, 2016 at 2:49:54 PM UTC-8, Ram Mittala wrote:

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Michael Anstis

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Jan 19, 2016, 10:29:17 PM1/19/16

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The URL shown in the Workbench *after* cloning is that of the local clone; not remote/origin. You can use this URL if you want to further clone the Workbench repository into, for example, Eclipse etc.

If you want to sync the Workbench clone with remote/origin you'll need to cd into the .niogit folder (normally in the Application Servers /bin folder; but could be elsewhere depending on how you've installed the AS - e.g. IIRC Ubuntu likes to scatter Tomcat all over the place, if installed through Synaptic), cd into your repository folder e.g rule-engine and git push origin.

With kind regards,

Mike

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Vikrant Chaudhary

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Dec 21, 2016, 8:03:04 AM12/21/16

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to Drools Setup

Hi Michael,

When I am trying to push to origin i am getting below error :

git.exe push --progress "origin" master:master

fatal: Could not read from remote repository.

Please make sure you have the correct access rights

and the repository exists.

Please help me in resolving this.

Thanks,

Vikrant

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Abhijit Humbe

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Dec 21, 2016, 2:12:40 PM12/21/16

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To push changes back to server git repository you have to ssh protocol. Try with SSH protocol.

Sours: https://groups.google.com/
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Overview

Drools is a Business Rules Management System (BRMS) solution. It provides a core Business Rules Engine (BRE), a web authoring and rules management application (Drools Workbench), full runtime support for Decision Model and Notation (DMN) models at Conformance level 3 and an Eclipse IDE plugin for core development.

Drools is open source software, released under the Apache License 2.0. It is written in 100% pure Java™, runs on any JVM and is available in the Maven Central repository too.

More information can be found on the following links:

These projects have community releases from JBoss.org that come without support. Community releases focus on fast paced innovation to give you the latest and greatest, with releases every few months that include both features and fixes. Red Hat JBoss BRMS is our enterprise product for mission critical releases, with a multi year commitment for backport of fixes, based off a sanitised community release of Drools. A range of support packages are available including up to mission critical 24/7, as well as training and consultancy via our Global Professional Services unit. Check Red Hat Process Automation Managerfor more details.
Sours: https://www.drools.org/
Drools Tutorial Part - 1- Java based Rule Engine - Drools getting started - Basic Setup

Drools

In order to familiarise myself with the Drools language I have spent several weeks working through various examples to understand

  • syntax
  • functionality
  • domain specific languages

This repository contains my full set of working examples.

Using Eclipse

Eclipse has a good Drools Plugin which can be installed from: http://download.jboss.org/drools/release/5.5.0.Final/org.drools.updatesite

In eclipse -> preferences be sure to navigate to Drools -> Installed Drools Runtime and navigate to a folder. Once you have a project running the plugin will copy the necessary drools jars here.

Using Maven

I decided to lay out my working environment as a maven project rather than a typical Drools project. This was purely because in the 'real world' we use Drools as part of a larger maven application, so for me it felt more realistic to use maven from the start. use a maven project rather than a typical Drools project. It made loading the files a little harder, as the classpaths had to be taken into account, whereas with a Drools Project the compipler knows exactly where to find the drl files.

If you use a Drools project you dont need a pom as maven is not used. The drools runtime pulls in all the drools dependencies you require. The downside of this is that if you wish to use hamcrest/junit etc you need to manually add those jars to the classpath - old school ;-)

Summary

Drools seems a straighforward domain to learn. It was quick to get running and make progress.

Its easy to read the logic, the drl files act as documentation. Rather than compound rules, write seperate ones with appropriate names.

Agenda and activation groups provide a nice way to order rules without relying on salience which could be difficult to maintain over time.

Some of the features, particularly those available within Stateful Sessions are very powerful (such as modifying the working memory during runtime, obtaining facts from the session and manipulating them. I found it difficult to think of real life usecases for the templated drools files, although I'm sure there are some good ones out there.

In my opinion if you have a problem or area in your code which a rules engine could solve then drools should definitely be considered.

Main Features

DROOLS Summary

Rules Engine

  • Dynamic – rules are stored, managed and updated as data.
  • Delivers knowledge reasoning and representation to the developer.
  • 3 components – ontology (model we are using to represent our 'things' ie records/classes), rules (perform the reasoning over) and data.
  • The engine takes the rules and they are applied to data to give outcomes. Ie it matches facts and data against rules to infer a conclusion which results in actions.
  • Rule engines tell you what to do, not how so it is easier to express solutions.
  • Rules engine separate logic (rules) from data (domain) so its easier to maintain future changes as the logic is all in one place.
  • Efficient at pattern matching.
  • Provide a centralisation of knowledge – all rules live in a knowledge base.
  • Rules are stored in 'production memory' and facts are in the 'working memory' which means the facts can be modified or retracted.

Rete Algorithm

  • Uses a network to match facts against production rules.
  • The rete algorithm builds up a network of nodes, each node corresponding to a pattern on the LHS (conditional part) of the rule.
  • Each node has facts which satisfy that pattern.
  • When facts are inserted they evaluate the network and if a node is matched (ie that fact causes the rule to be true), the node is annotated. This means when fireAllRules is called all the prep work has been done upfront so the execution of the rules is fast. Its already determined which rules to run.

Stateful Session

  • A Stateful session can be modified at runtime allowing rules to be re-evaluated eg: the RHS of a rule can manipulate the working memory by calling modify(), retract() which can cause rules on the activation list to be cancelled, or new rules to be added to the activation list.
  • Supports inference – that is the engine being aware of changes and re-reasoning over the rules to take account of the changes.
  • Must call dispose() when you have finished with a stateful session so that it is destroyed. This will prevent memory leaks.

Stateless Session

  • Manipulation of facts does not cause a re-evaluation of the rules.
  • Thought of more as a method or function call – you provide input, the rules are evaluated and you get a result back - that is it.
  • The command pattern is used (execute() starts the rule execution rather than fireAllRules() which is used in the stateful session).
  • Rather than insert(fact) you pass the facts into the session as parameters in execute() using any iterable java Collection.

Knowledge Builder

  • Creates a package of compiled rules for the Knowledge Base
  • Turns the drl file into a package definition of rules
  • You need to explicity check for compilation errors – 3 levels of error are reported ERROR, WARNING, INFO.

Knowledge Base

  • Compiled rules and process definitions

LHS (Left Hand Side)

  • The LHS defines the facts/statements to be reasoned over.
  • Can have logic like AND, OR, IN, CONTAINS etc...

RHS (Right Hand Side)

  • The consequence of the rule
  • Can contain java statements.
  • Can manipulate the (stateful) session by using retract, modify, insert, new etc..

Activation

  • The activation list holds all the rules whose LHS (condtions) are true and are therefore candidates to be run.
  • As you add facts to the working memory, the rete algorithm is reasoning over the rules and building up the activation list ready for when fireAllRules() is called.
  • When fireAllRules() is called the rules on the activation list are worked through. One rule may cause other rules to be cancelled or added to the activation list.

Agenda

  • Agendas are used for grouping rules together and can be used to control ordering of activations especially conflicting rules – it can be used to specify what order to execute the conflicting rules in.
  • When rules are fully matched and eligible for execution they are placed on an activation list and placed on the agenda for firing.
  • When fireAllRules() is called, focus switches to evaluate the Agenda (Agenda evaluation phase). This selects a rule to fire. If no rules exist, exit.
  • Firing a rule may change the working memory, similarly there could be several rules on the agenda. The rules engine needs to know which order to fire the rules. For this agenda groups can be used.
  • Agenda-Groups – Used to partition rules on the agenda. One agenda group will have focus at a time.
  • If you have rules which should be grouped together, you can use agenda groups. When you call setFocus(onThatAgendaGroup), that AgendaGroup is pushed onto the stack. Agenda groups can therefore be used to provide a flow between rules.
  • MAIN is the default agenda group. Any rule without an explicit Agenda Group will belong to Main.

Globals

  • Declaring global variable(s) provides a way of returning results to your calling code.
  • Should not be used on LHS for reasoning over.

SetFocus

  • If you set the focus to an agenda which does not exist, no compilation error is displayed.
  • The 'bad' group is put on the activation stack it will contain no rules so will simply be skipped over.

Domain Specific Language (DSL)

  • seful if you want BA's to define the rules rather than development team.
  • An extra layer which provides a mapping from a human-readable (ubiquitous domain) language to drools language.
  • The compiler does an in memory translation to produce a drl file (no actual physical file is created).
  • Useful if a lot of rules have a similar structure or behaviour.

Template

  • You can create templated drl files so you can generate a complete drl on the fly.
  • Can have java expand the template and just pass in the fact objects which are substituted and flesh the drl out.
  • Can't think of any useful usecases for this, perhaps some sort of book categorisation?

Functions

  • Drools allows you to define functions (and queries) which rules can call (and java can call).
  • eval(functionName) can only be used with functions returning a boolean.
  • For non-booleans you call the function directly using its name.

Defining types

  • You can declare types within a drools file to store results or create objects that are only needed within the session.
  • You can access the defined type from outside the session in the calling code, and manipulate its values which can be powerful – ie you can define a new type in drools, have no java class, yet reference it and change its state from java.
Sours: https://github.com/gemcfadyen/Drools

Github drools

Developing Drools and jBPM

An open source rule engine, DMN engine and complex event processing (CEP) engine for Java™ and the JVM Platform.

Drools is a business rule management system with a forward-chaining and backward-chaining inference based rules engine, allowing fast and reliable evaluation of business rules and complex event processing. A rule engine is also a fundamental building block to create an expert system which, in artificial intelligence, is a computer system that emulates the decision-making ability of a human expert.

Be sure to check out the Drools' project website and documentation!

If you want to build or contribute to a kiegroup project, read this document.

It will save you and us a lot of time by setting up your development environment correctly. It solves all known pitfalls that can disrupt your development. It also describes all guidelines, tips and tricks. If you want your pull requests (or patches) to be merged, please respect those guidelines.

Sours: https://github.com/kiegroup/drools
Drools Tutorial Part - 1- Java based Rule Engine - Drools getting started - Basic Setup

SWRLAPI Drools Engine

Build StatusMaven Central

Drools implementation of a SWRLAPI-based OWL 2 RL reasoner and SWRL rule engine.

Documentation can be found at the SWRLAPI Drools Engine Wiki.

Getting Started

This library provides SWRL rule and SQWRL engine implementations for the SWRLAPI library. See the SWRLAPI README for usage instructions.

The engine's dependency information can be found here:

Maven Central

Building from Source

To build this project you must have the following items installed:

Get a copy of the latest code:

Change into the swrlapi-drools-engine directory:

Then build it with Maven:

On build completion your local Maven repository will contain the generated swrlapi-drools-engine-${version}.jar file.

This JAR is used by the ProtégéSWRLTab Plugin and by the standalone SWRLTab tool.

A Build Project is provided to build core SWRLAPI-related components. A project containing a library of integration tests is also provided. A sample project that used this rule engine can be found here.

License

The software is licensed under the BSD 2-clause License.

Questions

If you have questions about this library, please go to the main Protégé website and subscribe to the Protégé Developer Support mailing list. After subscribing, send messages to protege-dev at lists.stanford.edu.

Sours: https://github.com/protegeproject/swrlapi-drools-engine

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Mastering JBoss Drools 6

Mastering JBoss Drools 6

This is the code repository for Mastering JBoss Drools 6, published by Packt.

What is this book about?

Mastering JBoss Drools 6 will provide you with the knowledge to develop applications involving complex scenarios. You will learn how to use KIE modules to create and execute Business Rules, and how the PHREAK algorithm internally works to drive the Rule Engine decisions. This book will also cover the relationship between Drools and jBPM, which allows you to enrich your applications by using Business Processes. You will be briefly introduced to the concept of complex event processing (Drools CEP) where you will learn how to aggregate and correlate your data based on temporal conditions. You will also learn how to define rules using domain-specific languages, such as spreadsheets, database entries, PMML, and more.

Towards the end, this book will take you through the integration of Drools with the Spring and Camel frameworks for more complex applications.

This book covers the following exciting features:

  • Automate your application’s decisions, such as promotion applying, discount policies, fraud detection, and more
  • Quickly get started with writing your first rules using the DRL full syntax
  • Discover the power of the new syntax components of the rule language
  • Define inferences in your business rules to simplify complex decisions
  • Write decision tables, templates,domain-specific languages, and scorecards, and learn how to map them to the Drools framework

If you feel this book is for you, get your copy today!

https://www.packtpub.com/

Get to Know the Author

Mauricio Salatino is a Senior software engineer at JBoss/RedHat. Mauricio works full time as a Drools and jBPM Core Developer and is in charge of developing the new generation Business Process Management Suite, along with contributing to the evolution of Drools and jBPM. Mauricio is the author of three Packt Publishing books about jBPM: jBPM6 Developer Guide, jBPM5 Developer Guide, and jBPM Developer Guide. Mauricio is based in London, UK, and in his spare time he likes to meet community members of different open source projects to build interesting projects.

Mariano De Maio is an IT consultant and software developer with over eleven years of experience in Java and open source frameworks. He has been working with Drools and jBPM for the last six years and has collaborated with the Drools and jBPM projects several items, including Infinispan's persistence modules, extensions to the jBPM APIs, and different add-ons to the tooling functionality. In 2013, he wrote jBPM6 Developer Guide for Packt Publishing, along with Mauricio Salatino and Esteban Aliverti. In 2015, he co-founded jWoop, http://www.jwoop.com, which is a company that provides consultancy and training around the world. He has participated in international conferences, such as Decision Camp and other Decision Management webinars. Mariano is based in Buenos Aires, where he is happily married to his wife, Tamara, and takes care of his beautiful daughter, Sofia. In his free time, he likes to work on contributions to the open source projects he is using. He also runs his personal blog, http://marianbuenosayres.wordpress.com, about jBPM, Drools, and Decision Management. You can find him through the official Drools IRC channel #drools at irc.freenode.net, under the nickname mariano or mariano84.

Esteban Aliverti is a software engineer and a former Drools/JBPM consultant. He is also a fervent open source promoter and developer with meaningful contributions to the JBoss Drools and JBPM frameworks for the past six years. He is the coauthor of jBPM5 Developer Guide and jBPM6 Developer Guide by Packt Publishing and was awarded the JBoss' Community Recognition Award in 2012 and 2013.


Suggestions and Feedback

Click here if you have any feedback or suggestions.

Sours: https://github.com/PacktPublishing/Mastering-JBoss-Drools-6


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