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3.4. Executable rule models

Rule assets in Red Hat Decision Manager are built from executable rule models by default with the standard kie-maven-plugin plugin. Executable rule models are embedded models that provide a Java-based representation of a rule set for execution at build time. The executable model is a more efficient alternative to the standard asset packaging in previous versions of Red Hat Decision Manager and enables KIE containers and KIE bases to be created more quickly, especially when you have large lists of DRL (Drools Rule Language) files and other Red Hat Decision Manager assets.

If you do not use the kie-maven-plugin plugin or if the required drools-model-compiler dependency is missing from your project, then rule assets are built without executable models. Therefore, to generate the executable model during build time, ensure that the kie-maven-plugin plugin and drools-model-compiler dependency are added in your project pom.xml file.

Executable rule models provide the following specific advantages for your projects:

  • Compile time: Traditionally, a packaged Red Hat Decision Manager project (KJAR) contains a list of DRL files and other Red Hat Decision Manager artifacts that define the rule base together with some pre-generated classes implementing the constraints and the consequences. Those DRL files must be parsed and compiled when the KJAR is downloaded from the Maven repository and installed in a KIE container. This process can be slow, especially for large rule sets. With an executable model, you can package within the project KJAR the Java classes that implement the executable model of the project rule base and re-create the KIE container and its KIE bases out of it in a much faster way. In Maven projects, you use the kie-maven-plugin plugin to automatically generate the executable model sources from the DRL files during the compilation process.
  • Run time: In an executable model, all constraints are defined as Java lambda expressions. The same lambda expressions are also used for constraints evaluation, so you no longer need to use mvel expressions for interpreted evaluation nor the just-in-time (JIT) process to transform the mvel-based constraints into bytecode. This creates a quicker and more efficient run time.
  • Development time: An executable model enables you to develop and experiment with new features of the decision engine without needing to encode elements directly in the DRL format or modify the DRL parser to support them.
注記

For query definitions in executable rule models, you can use up to 10 arguments only.

For variables within rule consequences in executable rule models, you can use up to 24 bound variables only (including the built-in drools variable). For example, the following rule consequence uses more than 24 bound variables and creates a compilation error: 

...
then
  $input.setNo25Count(functions.sumOf(new Object[]{$no1Count_1, $no2Count_1, $no3Count_1, ..., $no25Count_1}).intValue());
  $input.getFirings().add("fired");
  update($input);

3.4.1. Modifying or disabling executable rule models in a Red Hat Decision Manager project
リンクのコピー

Rule assets in Red Hat Decision Manager are built from executable rule models by default with the standard kie-maven-plugin plugin. The executable model is a more efficient alternative to the standard asset packaging in previous versions of Red Hat Decision Manager. However, if needed, you can modify or disable executable rule models to build a Red Hat Decision Manager project as a DRL-based KJAR instead of the default model-based KJAR.

Procedure

Build your Red Hat Decision Manager project in the usual way, but provide an alternate build option, depending on the type of project:

  • For a Maven project, navigate to your Maven project directory in a command terminal and run the following command: 

    mvn clean install -DgenerateModel=<VALUE>

    Replace <VALUE> with one of three values:

    • YES_WITHDRL: (Default) Generates the executable model corresponding to the DRL files in the original project and also adds the DRL files to the generated KJAR for documentation purposes (the KIE base is built from the executable model regardless).
    • YES: Generates the executable model corresponding to the DRL files in the original project and excludes the DRL files from the generated KJAR.
    • NO: Does not generate the executable model.

    Example build command to disable the default executable model behavior: 

    mvn clean install -DgenerateModel=NO

  • For a Java application configured programmatically, the executable model is disabled by default. Add rule assets to the KIE virtual file system KieFileSystem and use KieBuilder with one of the following buildAll() methods:

    • buildAll() (Default) or buildAll(DrlProject.class): Does not generate the executable model.
    • buildAll(ExecutableModelProject.class): Generates the executable model corresponding to the DRL files in the original project.

    Example code to enable executable model behavior: 

    import org.kie.api.KieServices;
import org.kie.api.builder.KieFileSystem;
import org.kie.api.builder.KieBuilder;

  KieServices ks = KieServices.Factory.get();
  KieFileSystem kfs = ks.newKieFileSystem()
  kfs.write("src/main/resources/KBase1/ruleSet1.drl", stringContainingAValidDRL)
  .write("src/main/resources/dtable.xls",
    kieServices.getResources().newInputStreamResource(dtableFileStream));

  KieBuilder kieBuilder = ks.newKieBuilder( kfs );
  // Enable executable model
  kieBuilder.buildAll(ExecutableModelProject.class)
  assertEquals(0, kieBuilder.getResults().getMessages(Message.Level.ERROR).size());
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