July 30, 2023

tBRMS – Docs for ESB 7.x

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tBRMS

Applies Drools business rules to an incoming flow and writes the output data to an
XML file.

tBRMS retrieves
business rules from a Drools repository and applies them to a Job.

For more information about Drools, see http://drools.org/.

tBRMS Standard properties

These properties are used to configure tBRMS running in the Standard Job framework.

The Standard
tBRMS component belongs to the Processing family.

This component is available in Talend Data Management Platform, Talend Big Data Platform, Talend Real Time Big Data Platform, Talend Data Services Platform, Talend MDM Platform and Talend Data Fabric.

Basic settings

Property type

Either Built-in or
Repository
.

 

Built-in: No property data stored
centrally.

 

Repository: Select the repository
file where properties are stored. The fields that follow are
completed automatically using the fetched data.

Schema and Edit Schema

A schema is a row description, it defines the number of fields
that will be processed and passed on to the next component. The
schema is either Built-in or stored
remotely in the Repository.

Click Edit
schema to make changes to the schema. If the current schema is of the Repository type, three options are available:

  • View schema: choose this
    option to view the schema only.

  • Change to built-in property:
    choose this option to change the schema to Built-in for local changes.

  • Update repository connection:
    choose this option to change the schema stored in the repository and decide whether
    to propagate the changes to all the Jobs upon completion. If you just want to
    propagate the changes to the current Job, you can select No upon completion and choose this schema metadata
    again in the Repository Content
    window.

 

Built-in: You create and store
the schema locally for only the current component. Related topic:
see
Talend Studio User
Guide.

 

Repository: The schema already
exists and is stored in the Repository, hence can be reused in
various projects and Job flowcharts. Related topic: see

Talend Studio User
Guide.

XML Field

Select the XML field for the data to be written to the output
file.

Choose rule module

Select from the list:

– Use latest deployment from Drools
workbench: Always choose this option when you run the
Job for the first time. The Job uses the latest deployment of the rule
on the Drools repository. If the rule has been changed meanwhile, the
Job results will be different.

– Use local rules: with this option, you
execute the Job with the local rule you imported previously from the
repository to the root folder of your studio, in /studio_path/Drools/<project_name>, that is the latest
package we browse from the Drools workbench. This means, even if you
have modified the rule and deployed it on the repository, the Job
results will not be different.

Do not use this option when you run your Job for the first
time.

The fields that follow will vary according to your choice.

Drools Workbench Connection
Select the Drools distribution from the Choose
distribution list:

  • Redhat BRMS
    6.2
  • JBoss BRMS
    6.2
  • Redhat Decision Manager 7.3

You can also import Jobs that use a connection to the
deprecated Talend BRMS with TAC
authentication from previous versions of Talend Studio.

Drools Workbench URL

Enter the address of the business
rule repository.
Username and
Password

Enter the authentication information used
to connect to the Drools Workbench of interest.

To enter the password, click the […] button next to the
password field, and then in the pop-up dialog box enter the password between double quotes
and click OK to save the settings.

Module list

Click the three-dot button next to
the field to open a list of the Jars on the Drools Workbench.

Maven Deployment Path

After you select the Jar file from the Drools
Workbench, this field is automatically populated.

Class Name

After you select the Jar file, this field is automatically
populated with the name of the class in which the business rule is
stored in a Jar file.
Drools flow ID
(optional)

A Drools flow describes the order in which a series of business
rules are executed. Its flow ID is defined manually when you are
creating the Drools flow.

When you need to call a specific Drools flow via tBRMS to use the execution order it
defines, enter the corresponding flow ID in this field.

For more information about Drools flow, see the relevant Drools
manuals.

Advanced Settings

Configure XML Tree

Click […] to map the source
schema to the XML output schema.

Group by

Use the tool bar to modify the column order.

Advanced separator

Select this check box to modify the separators used for
numbers.

Encoding

Select the encoding type from the list or select Custom and define it manually. This field
is compulsory for DB data handling.

tStatCatcher Statistics

Select this check box to collect the log data at the component
level.

Global Variables

Global Variables

ERROR_MESSAGE: the error message generated by the
component when an error occurs. This is an After variable and it returns a string. This
variable functions only if the Die on error check box is
cleared, if the component has this check box.

NB_LINE: the number of rows read by an input component or
transferred to an output component. This is an After variable and it returns an
integer.

A Flow variable functions during the execution of a component while an After variable
functions after the execution of the component.

To fill up a field or expression with a variable, press Ctrl +
Space to access the variable list and choose the variable to use from it.

For further information about variables, see
Talend Studio

User Guide.

Usage

Usage rule

This component handles data flows. Therefore it requires input and
output components.

Limitation

When using the tBRMS component in subJobs with the
same value in the Class name field, select the
Use an independent process to run subJob
check box in the tRunJob component settings to be
able to run the Job correctly.

For further information about the
tRunJob component, see the documentation on
Talend Help Center (https://help.talend.com).

Applying business rules to an Excel file to filter
data

This scenario applies only to subscription-based Talend products.

This scenario describes a Job in which tBRMS applies Drools business rules to an Excel
file, in order that relevant data can be retrieved in the output. In this case, rules are
applied to input data about candidates applying for a loan. The output will show whether
the candidates are qualified or not.

tBRMS_1.png

Before you begin, the business rules to use in the Job have
been already created and deployed on the Drools repository.

You can also clone repositories in Drools to have access to
business rules stored in them.

Dropping and linking the components

  1. Drop the following components from the Palette onto the design workspace: tFileInputExcel, tMap,
    tBRMS, tExtractXMLField, tLogRow.
  2. Link tFileInputExcel to
    tMap using a Row > Main connection. Rename the link as loanAsk to better identify its function.
  3. Link tMap to tBRMS using a Row > *New Output*
    (Main)     connection.
  4. Link tBRMS to tExtractXMLField using a Row > Main connection
    and then use another Row > Main
    connection to connect tExtractXMLField to
    tLogRow.

Configuring the input component

  1. Double-click tFileInputExcel to open its Basic
    settings     view and define the component properties:

    tBRMS_2.png

  2. In the Property
    type     list, select Built-in and fill in the fields that follow.
  3. Click the three-dot button next to the File Name/Stream field and
    browse to the source file to set its path and name. The source file used in this
    example is called brmsInput and it holds
    candidate data.

    Note:
    As tBRMS does not
    support the .xlsx format, do not select Read
    excel2007 file format(xlsx)    .

  4. If needed, right-click tFileInputExcel and select Data
    viewer     to have a preview of the input data.
  5. Select the All
    sheets     check box to retrieve the data from all sheets of the
    excel file.
  6. From the Schema list, select Built-in and click Edit
    schema     to define the structure of the source data. In this
    example, five columns are defined for the input information of candidates.

    tBRMS_3.png

  7. Click OK to validate your changes and
    close the dialog box.

Configuring the tMap component

  1. Double-click tMap to
    open its Map Editor.

    tBRMS_4.png

  2. In the lower right part of the map editor, click the plus button to add
    eight columns: age, annualRevenue, loanDeposit, loanAmount,
    numberOfYears, loanInterest, monthlyPayment, rejected.

    These columns will appear in the synonyms table on the right side of the
    map editor. In this example, the table is row1.
  3. In the upper left part of the map editor (input flow), select the
    age and annualRevenue columns and drop them respectively to the
    age and annualRevenue columns in the upper right part of the map
    editor (output flow).

    Alternatively, click Auto map! to map the
    columns with the same name automatically.
  4. In the row1 table, click the Expression column in the loanDeposit row to locate the cursor, and then click the
    three-dot […] button to open the
    Expression Builder dialog box.

    Enter the following expression to calculate the loan deposit:

    tBRMS_5.png

    Click OK to close the Expression Builder dialog box.
    Now the downPayment and totalAmount fields from the incoming data flow
    are concatenated to the output column: loanDeposit.
  5. Click the Expression column in the
    loanAmount row to locate the
    cursor.

    Enter the following expression to calculate the amount of
    loan:
  6. Click the Expression column in the
    numberOfYears row to locate the
    cursor.

    Enter loanAsk.duration to concatenate
    the duration row of the input flow to the
    numberOfYears row in the output
    column.
  7. Enter 0.0 in the Expression column of the loanInterest and monthlyPayment rows respectively.
  8. Enter false in the Expression column of the rejected row.
  9. Click OK to close the map editor.

Configuring the tBRMS component

Configuring the basic settings of the tBRMS
component

  1. Click tBRMS to open its Basic settings view.

  2. Click […] next to Edit schema to open the schema editor.

    The input schema to the left is automatically retrieved from tMap.
    tBRMS_6.png

  3. In the output area to the right, click [+] to add a new column which will serve to write the output
    data to an XML file. Enter a name for the column and define the Type as String.

    Click OK to validate your changes and
    close the dialog box.
  4. From the XML Field list, select the name
    of the XML column you entered in the output schema.
  5. From the Choose rule module list, select Use latest deployment from Drools
    workbench     to download the Jar file from the Drools
    repository.

    For further information on using Drools to
    build and deploy business rules, see Talend Administration Center User Guide.
  6. From the Choose
    distribution     list, select Redhat
    Decision Manager 7.3    .
  7. In the Drools Workbench Url, enter the address of the
    Drools Workbench .
  8. Type in the user name and the password used to
    connect to the Drools Workbench.
  9. Next to Module List,
    click […] to open the Deploy Package dialog box.

    In this dialog box, the URL, Username and Password fields are already filled with the
    corresponding information you entered in the earlier steps.
  10. Click […] to browse
    the Jar files in the Select Package dialog
    box and select the jar package org.talend.bank for this
    example. tBRMS_7.png
  11. From the list next to the selected jar package,
    select the class org.talend.bank.LoanSimulator and then click OK to close the dialog box.

    A
    Talend
     programme transforms the business rule library into a form which
    can be used in the Job and creates an XSD file at the root of your studio, at
    /studio_path/Drools/<project_name>. The XSD file records
    the mapping between the incoming data flow and the objects to be handled by the
    Drools engine.
  12. In the Drools Flow ID (optional) field,
    enter, between quotation marks, the ID of Drools flow to be used when
    executing the rules of interest.

    In this example, it is loanflow.
    For more information about Drools flow, see the relevant Drools manuals.

Configuring the XML mapping

  1. Click the Advanced Settings tab to set
    the additional parameters.

    tBRMS_8.png

  2. In the XML Mapping area, click […] to configure the XML tree.

    Right-click the first row in the Link
    target     table and select Import XML
    Tree    .

    tBRMS_9.png

  3. Browse to and select the XSD file from the root of your studio. The
    XML Tree schema is completed
    automatically.

    tBRMS_10.png

  4. Drop all of the relevant columns from the Schema
    List     onto the corresponding related column fields in the
    Link target schema.

    From the dialog box which appears, select the Add
    linker to target node     option.
    tBRMS_11.png

    Alternatively, you can click Auto map! to
    concatenate automatically the columns between the Linker source and Link
    target    .
  5. Right-click the reason field and select
    Set As Loop Element from the
    list.

    tBRMS_12.png

  6. Click OK to close the dialog box.

Configuring the output flow

To extract the data of interest, you need to configure the output flow. The
operations to be performed are as follows:

  1. Double-click tExtractXMLField to open its
    Basic settings view.
  2. Click Edit schema to open the schema
    editor.

    tBRMS_13.png

  3. In the Output schema to the right of the editor, add and define the
    columns which correspond to those columns in the tBRMS input schema. The sequence and names of columns may
    vary according to your need.
  4. Click OK to close the editor.
  5. In the Loop XPath query field, enter the
    name of the XML Tree root tag, as it
    appears in the Configure XML Tree editor of
    the tBRMS component, preceded by the
    forward slash symbol and between double quotation marks, for example:
    “/loanSimulator”.
  6. In the XPath query fields, next to the
    corresponding columns, enter the fields exactly as they appear in the
    XML Tree fields of the tBRMS component, in the Link Target area of the Configure XML
    tree     editor, between double quotation marks.
  7. Double-click tLogRow to open its
    Basic settings view:

    tBRMS_14.png

  8. In the Mode area, select the Table (print values in cells of a table)
    option.

Saving and executing the Job

  1. Press Ctrl+S to save your Job.
  2. Press F6 or click Run on the Run console to
    launch the Job.

    tBRMS_15.png

    The business rule has been applied to the input data and the table of
    results indicates which candidates have been rejected. The Reason column indicates the reason for which the
    candidate has been rejected.
Document get from Talend https://help.talend.com
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Docs 7.x
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