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Drools5 Community Training: Module 1.5 - Drools Expert First Example
 

Drools5 Community Training: Module 1.5 - Drools Expert First Example

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for more information visit: http://salaboy.wordpress.com

for more information visit: http://salaboy.wordpress.com

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  • Full Name Full Name Comment goes here.
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  • Hi Eng,
    Sorry for the late reply. All Clips, Jess and Drools are Rule Engines, Clips is written in C, Jess is a Port to Java and Drools is also Java. The main advantage of drools is a really active developer community and the integration with other tools such as a Process Engine and Complex Event Processing.
    You can analyse data with Drools, writing rules based on your information, but it really depends on what your goals are.
    Hope this helps
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  • I am beginner at text mining field , i want to extract information from textual data , can i do that by using Drools or no , and can you help me to know different between Clips,Jess,Drools and what is the best
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    Drools5 Community Training: Module 1.5 - Drools Expert First Example Drools5 Community Training: Module 1.5 - Drools Expert First Example Presentation Transcript

    •    Drools5 Community Training Sponsored by Plugtree
    • Module 1.5: Drools Expert  First Example Drools5 Community Training version: 1.0-SNAPSHOT Release Date: 03/16/2011Under The Creative Common License
    • Module 1.5: Drools Expert First Example Drools5 Community Training Course by Mauricio "Salaboy" Salatino and Esteban Aliverti is licensed under a Creative Commons Attribution 3.0 Unported License. Based on a work at salaboy.wordpress. com. Permissions beyond the scope of this license may be available at http: //salaboy.wordpress.com/.
    • AgendaIntroductionBusiness Rule StructureDrools Expert Example ScenarioHands on lab
    • Drools Expert in 2 slidesThe core of DroolsLets us express our Knowledge -> Business RulesLets us create Sessions -> Our WorldIt will be in charge of making inferences between them andfiring the correspondent actions.Lets see how it works!
    • Drools Expert in 2 slides
    • Business Rule Structurerule "My Rule" when <LHS> Person(name == "John") <CEs> then <RHS> System.out.println("Hi John!"); <Actions>end
    • Example Scenario
    • Example ModelWe can define that a Pet will have a name, type and a position.For this example a Person will have a Pet which he/she can call. Andthis Person can also call the fire department.The Firefighter will know how to retrieve a Cat from a Tree.
    • Example Rules Rule "Call Cat when it is in a tree" When my Cat is on a limb in a tree Then I will call my Cat Rule "Call the fire department" When my Cat is on a limb and it doesnt come down when I call Then call the Fire Department Rule "Firefighter gets the cat down" When the Firefighter can reach the Cat Then the Firefighter retrieves the Cat
    • Technical View of  the Model
    • Technical View of  the Rulesrule "Call Cat when it is in a tree" when $p: Person($pet: pet, petCallCount == 0) $cat: Pet(this == $pet, position == "on a limb", type == PetType.CAT) then //$cat.getName() + " come down!" $p.setPetCallCount($p.getPetCallCount()+1); update($p);end Rule "Call Cat when it is in a tree" When my Cat is on a limb in a tree Then I will call my Cat
    • Technical View of  the Rulesrule "Call the fire department" when $p: Person($pet: pet, petCallCount > 0) $cat: Pet(this == $pet, position == "on a limb", type == PetType.CAT) then Firefighter firefighter = new Firefighter("Fred"); insert(firefighter);end Rule "Call the fire department" When my Cat is on a limb and it doesnt come down when I call Then call the Fire Department
    • Technical View of  the Rulesrule "Firefighter gets the cat down" when $f: Firefighter() $p: Person($pet: pet, petCallCount > 0) $cat: Pet(this == $pet, position == "on a limb", type == PetType.CAT) then $cat.setPosition("on the street"); retract($f); update($cat);end Rule "Firefighter gets the cat down" When the Firefighter can reach the Cat Then the Firefighter retrieves the Cat
    • Active Scenario in JavaFor the previous rules to fire in our Java world we need to have: An instance of a Person that contains a relation to its Pet An instance of a Pet that is on a limb Person person = new Person("Salaboy!"); Pet pet = new Pet("mittens", "on a limb", Pet.PetType.CAT); person.setPet(pet);
    • APIs Sneak Preview
    • Hands OnProject Name: drools5/00-Drools5-FirstExampleSources: https://github.com/Salaboy/Drools_jBPM5-Training-ExamplesCharacteristics: Java Project (jar) Uses Maven (pom.xml) Drools Dependencies (core, api, compiler) DRL File (src/test/resources/rules.drl)To do: Run the test (src/test/java/org/plugtree/example/FirstExampleTest.java) Get familiar with the output
    • Hands OnExercise 1: Create a new rule that inserts a Dog (on the street) when there is Cat on the street too. Create a new rule for the situation when a Cat and a Dog are on the street, the Dog should chase it up to the tree and then the Cat should climb the limb.
    • Hands On - Solutionrule "Cat on the street" when Pet(position == "on the street", type == PetType.CAT) then Pet dog = new Pet("doggy", "on the street" , PetType.DOG); insert (dog);endrule "Cat on the street and a dog is around" when $cat: Pet(position == "on the street", type == PetType.CAT) $dog: Pet(position == "on the street", type == PetType.DOG) then modify($cat){ setPosition("on the limb"); } modify($dog){ setPosition("under the tree"); }end
    • Hands On - What Happen?Exercise 1: What happens with the execution? Why? Try to find a solution
    • Briefing UpCovered Topics: Quick review about Drools Expert Project Dependencies A simple example that shows the key things that we need to have to use Drools
    •    Questions?
    • Enjoy! Questions and Feedback are alwaysappreciated!Stay Tuned!
    •     Contact us atwww.plugtree.com