drools | rule engine , DMN engine | Code Analyzer library

 by   kiegroup Java Version: 7.74.0.Final License: No License

kandi X-RAY | drools Summary

kandi X-RAY | drools Summary

drools is a Java library typically used in Code Quality, Code Analyzer applications. drools has no bugs, it has build file available and it has high support. However drools has 2 vulnerabilities. You can download it from GitHub, Maven.

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.

            kandi-support Support

              drools has a highly active ecosystem.
              It has 5249 star(s) with 2399 fork(s). There are 296 watchers for this library.
              It had no major release in the last 12 months.
              drools has no issues reported. There are 26 open pull requests and 0 closed requests.
              It has a positive sentiment in the developer community.
              The latest version of drools is 7.74.0.Final

            kandi-Quality Quality

              drools has no bugs reported.

            kandi-Security Security

              drools has 2 vulnerability issues reported (1 critical, 1 high, 0 medium, 0 low).

            kandi-License License

              drools does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              drools releases are not available. You will need to build from source code and install.
              Deployable package is available in Maven.
              Build file is available. You can build the component from source.

            Top functions reviewed by kandi - BETA

            kandi has reviewed drools and discovered the below as its top functions. This is intended to give you an instant insight into drools implemented functionality, and help decide if they suit your requirements.
            • matchTimeInterval
            • assumes primary key
            • identifier suffix
            • Compute the time after the given date .
            • Match a variable definition
            • Build the trait map field .
            • Convert an expression to a typed expression
            • From an accumulator .
            • Creates a new XStream .
            • parses a floating pointLiteral
            Get all kandi verified functions for this library.

            drools Key Features

            No Key Features are available at this moment for drools.

            drools Examples and Code Snippets

            SQL BOM Tree Joining
            Lines of Code : 61dot img1License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            CREATE TABLE dbo.ImagineThis
              SKU   varchar(32),
              BOM   varchar(32), 
              CLASS varchar(32)
            INSERT dbo.ImagineThis(SKU,BOM,CLASS) VALUES
            ('RM123' , '',       'D'),
            ('WPR123', 'RM123' , 'C'),
            ('WPR456', 'RM123' , 'C'),
            ('123'   , 'WPR
            UTF8 support for robocopy in bat file
            Lines of Code : 39dot img2License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            @ECHO OFF
            SETLOCAL EnableExtensions DisableDelayedExpansion
            @REM Get the current code page and remember it with the environment variable InitialCodePage.
            FOR /F "tokens=*" %%I IN ('%SystemRoot%\System32\chcp.com') DO FOR %%J IN (%%I) DO SE
            copy iconCopy
            JsonSerializer.Serialize(payload, requestStream);
            public void Serialize(T instance, Stream stream)
               using(var streamWriter = new StreamWriter(stream, Encoding.UTF8) // <-- Adds a BOM
               using(var jsonWriter 
            I can't read the results of the openstreetmap api with vba
            Lines of Code : 47dot img4License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            xmlhttpRequest.Open "GET", "http://nominatim.openstreetmap.org/search?q=" & Replace(address, " ", "+") & "&format=xml&polygon=1&addressdetails=1"
            xmlhttpRequest.Open "GET", "http://nominatim.ope
            Combine SQL rows into one column based off two other columns
            Lines of Code : 21dot img5License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
                 bs.ITEMNAME AS Item
                ,bom.ITEM AS PartNumber
            INTO #tempBomList
            FROM vwAXBOM bom
                LEFT JOIN S2BOMSTR bs 
                    ON bom.POSITION = bs.ITEMNUM
                LEFT JOIN vwExtendedDescriptionMFG ed
                    ON bom.ITEM = ed.itemid
            Copy specific cells from range into new worksheet range
            Lines of Code : 56dot img6License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            Option Explicit
            Sub BuildBOM()
                ' Assign the source of the estimate I want to copy
                Dim SourceSht As Worksheet
                Set SourceSht = ThisWorkbook.Sheets("Estimate")
                Dim sourceCols() As String
                ' Which Cells do I want to co
            How to set Encoding
            Lines of Code : 15dot img7License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            # The StreamWriter class by default uses Utf8 without BOM encoding
            # get a StreamWriter to a new or existing file to append text to
            $streamWriter = [System.IO.File]::AppendText('D:\Test\Blah.txt')
            # or if you want to overwrite an existin
            JDBC from Camel and Spring Boot to MS SQL Server
            Lines of Code : 213dot img8License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            package com.bw;
            import org.apache.camel.builder.RouteBuilder;
            import org.springframework.beans.factory.annotation.Autowired;
            import org.springframework.jdbc.datasource.AbstractDataSource;
            import org.springframework.stereotype.Component;
            Write Excel range to UTF-8 text file
            Lines of Code : 82dot img9License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            Sub CreateUTFTxtFile() 'it looks to return UTF-16 LE-BOM
             Dim rng As Range, LastRow As Long, i As Long
             Dim fso As Object, MyFile As Object, boolUnicode As Boolean
             Dim myFileName As String
                myFileName = "C:\Users\user1\Desktop\temp\o
            Rearranging SQL Query Results
            Lines of Code : 5dot img10License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            SELECT a.* FROM bom a
            LEFT JOIN bom b
            ON a.bomitem = b.partID
            ORDER BY ISNULL (b.partID, a.partID), a.partID

            Community Discussions


            How to deal with publishing promotion issues Hybris 2105?
            Asked 2022-Feb-16 at 07:14

            We have migrated our SAP Hybris from 2011 to 2105.

            There are some issues coming while publishing new promotions, which seem to work fine in the lower version.When we publish a promotion(even OOB promotion like in Conditions CMS Site and in Action 10% discount on cart) and when I publish the promotion, I get an error like:



            Answered 2022-Feb-02 at 20:56

            This is due to some changes in the drools rule engine. This causes an exception during the parsing of older Drools Rule.

            To solve this, you can

            • Make the content of all drools rules blank, and republish all rules to have correct and active drools rules for all your promotions. Example of a script: You need to disable the interceptors as they might prevent you from changing the rule content

            Source https://stackoverflow.com/questions/70929736


            Can a rules file have a dependency on other rules?
            Asked 2022-Feb-09 at 08:07

            I'm using drools rules engine for my new service. I'm looking at cleaning up the rules / making it easier to write. I was hoping to use a rules framework style of coding. I.e. I want a rules file who's sole purpose is to validate the input data (i.e. input list isn't null and contains a specific value). Then when I write new rules files I can just say import this and run the validation before all other rules.

            Also, I know I can load multiple rules file into the KieSession. Is it possible to tell it which order to run the rules files in, or which files to skip for each use case? The idea behind this is for performance. Let's say I load up an AWS lambda function with the rules service, I want to have all rules loaded already and have it run the specific one for the use case, instead of loading up a rules file for each call.

            Thanks for the help.



            Answered 2021-Dec-15 at 20:31

            You asked

            Is it possible to tell it which order to run the rules files in, or which files to skip for each use case?

            The answer is yes. The method to do this is called salience. The linked article is a good source to learn about this. This is important because salience can make it possible to change the order of execution of rules.

            Hypothetically, let say that you have a program that process transactions based on categories. So, if category == deposit, you want to add to current balance. You have another rule that if category == withdrawal you want to subtract from current balance. BUT, you want to process deposits over withdrawals. Using salience you can guarantee that the deposits rule will fire before the withdrawal rule regardless of order of transaction.

            Dependency is kind of related, but not the same. In drools, this is know as Forward or Backward Chaining depending on the order. This is all composed based on a series of facts. For example, if I was to ask a system "is my house on planet Earth?" the conclusion is reached if the following facts exist:

            1. My house is in Fort Worth
            2. Fort Worth is a city in Texas
            3. Texas is a state in the United States
            4. United States is a country on Earth

            A direct fact linking the house location to this planet is asserted based on the rules that verify the enumerated facts above. This is done using chaining. Forward or backwards is just how these are processed (top-down or bottom-up). This is in a nutshell to the best of my recollection.

            Source https://stackoverflow.com/questions/70369550


            What does a drools fact check (when) return when one uses the "in" operator
            Asked 2022-Jan-18 at 16:00

            I have the following rule



            Answered 2022-Jan-18 at 16:00

            Your rule will hit for each item in working memory that matches.

            Simplifying things, let's say that your model looks like this:

            Source https://stackoverflow.com/questions/70757530


            Drools Stream mode negative patterns
            Asked 2022-Jan-10 at 16:48

            i have a question about stream mode in Drools. I'm using this rule



            Answered 2021-Dec-26 at 23:47

            You use ruleflow-group 'default', thus you must set focus to agenda group to get rule executed, like getSession().getAgenda().getAgendaGroup("default").setFocus();

            Most likely you set focus before or after event insertion. After inserting first message you set focus but no rule was added to the agenda (rule is not yet eligible for execution) at that time, and focus get reset to main agenda group. After 10 seconds you state that no rule was triggered despite that rule was added to 'default' agenda (because main group has focus). You insert second message and set focus to 'default' agenda which executes the rule from the agenda being triggered by the first message.

            Rule is getting executed if you

            1. remove ruleflow-group (latest documentation promote agenda-group)
            2. add auto-focus true to the rule
            3. set agenda group focus after 10 seconds

            See how agenda group works

            Source https://stackoverflow.com/questions/70450846


            Optaplanner's benchmark warm up - OutOfMemory
            Asked 2022-Jan-04 at 12:50

            While trying to test the solution's solvers using a benchmark configuration, I encounter the follow exception :



            Answered 2021-Dec-23 at 20:43

            Increase memory, for example with VM option -Xmx4g

            Also note that parallelBenchmarkCount AUTO currently doesn't take into account that moveThreadCount is not NONE. So your benchmarks will not be accurate, because if you have 16 cores, parallelBenchmarkCount AUTO will resolve to 8. With moveThreadCount 4 (+ 1 solver thread), you'll be using 32+ cores but only have 16 cores. This probably should be reported as an issue in optaplanner's jira for parallelBenchmarkCount AUTO.

            Source https://stackoverflow.com/questions/70450791


            Generic classes within Drools-WorkBench
            Asked 2022-Jan-03 at 22:55

            I am currently working on a project that require that the input into Drools-Workbench for validation up against, is Generic.

            So in essence what should be happening is the following;

            1. receive object from an RabbitMQ channel.
            2. Validate object with Drools-WB.
            3. Upload the validation results (obtained from Drools-WB) to a RabbitMQ channel.

            I have the following class, wherein the input is the "generic part", and the ruleSet should specify which rulesheet should be used from the Drools-WB instance.



            Answered 2022-Jan-03 at 22:55

            I was able to reproduce NullPointerException for the first example only when I inserted objects without proper initialization. For the second case, indeed, this["DyrAlder"] < $param doesn't work, but this.get("DyrAlder") < $param, this.DyrAlder < $param and even DyrAlder < $param works for me.

            According to your description I complicated your rules with desired ruleSet parameter to get working POC for your requirements. Out of 10 objects being inserted, only 5 fit condition DyrAlder < 5 and only 1 fits ruseSet == "set3", thus you have the rule triggered only once.

            Test 1 (InputObject)

            Source https://stackoverflow.com/questions/70480906


            Is Drools Business Rules Management impacted by CVE-2021-44228
            Asked 2021-Dec-13 at 19:08

            We are using Drools for our business rules. Is Drools impacted/expose to the CVE-2021-44228 (Log4Shell or Log4J/Apache/Java vulnerability



            Answered 2021-Dec-13 at 16:45

            Looks like its not the case. In this thread you can find all apps impacted : https://gist.github.com/SwitHak/b66db3a06c2955a9cb71a8718970c592

            Source https://stackoverflow.com/questions/70335441


            drools getting error : handle not found for object is it in working memory
            Asked 2021-Dec-02 at 15:24

            This question is in continuation to an earlier question here so my data structure is as earlier :



            Answered 2021-Dec-02 at 15:24

            InsuranceType is not in working memory -- Premium is. So you need to modify Premium, not insurance type.

            There's really not a good way to do this. You could call update, but this will refire all rules (it's the equivalent of starting over with new data in working memory.)

            Source https://stackoverflow.com/questions/70193124


            Drools - how do I compare a string value present in a Java Object which is present inside a List
            Asked 2021-Nov-30 at 15:42

            I am new to Drools and am having a tough time writing rules Here is my data structure :



            Answered 2021-Nov-30 at 15:42

            I'm going to assume there's a public getName method on the InsuranceType class, and a public getInsuranceTypes method on the Premium class. If either of those isn't true, you need to add either getters or make those properties public.

            Your rule was pretty close. However the problem you have is that insuranceTypes is a list but you were treating it as an object.

            You have several options here, depending on your needs. However I'd go with the simplest, which is this:

            Source https://stackoverflow.com/questions/70163217


            How to loop through a list to check if an item is a memberOf another list
            Asked 2021-Nov-25 at 08:46

            I want to check if any item from a list of diagnosis codes exists in another list.

            I am new to Drools and I'm still trying to decide on the best approach as the current one isn't working (the output says null when it should be returning 'true').

            Java POJO



            Answered 2021-Nov-22 at 15:56

            I was able to solve it using the 'from' keyword

            Source https://stackoverflow.com/questions/70060458

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            Install drools

            You can download it from GitHub, Maven.
            You can use drools like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the drools component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .


            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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