Introducing Kogito
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The document discusses the transformation of Java projects into serverless components, specifically highlighting the integration of Drools and Kogito with Quarkus for improved business automation. It covers GraalVM's features, limitations, and the benefits of using a native compilation approach for faster processes and lower resource usage. Demonstrations and code examples illustrate the practical application of these technologies and the implementation of dynamic rule definitions.
![GraalVM Limitations
Dynaminc Classloading
Deloying jars, wars, etc. at runtime impossible
public class InternalClassLoader extends ClassLoader {
public Class<?> defineClass( String name, byte[] bytecode ) {
return defineClass( name, bytecode, 0, bytecode.length );
}
}](https://image.slidesharecdn.com/kogitodevnation-190718161939/85/Introducing-Kogito-8-320.jpg)
![GraalVM Limitations
Dynaminc Classloading
Deloying jars, wars, etc. at runtime impossible
public class InternalClassLoader extends ClassLoader {
public Class<?> defineClass( String name, byte[] bytecode ) {
return defineClass( name, bytecode, 0, bytecode.length );
}
}](https://image.slidesharecdn.com/kogitodevnation-190718161939/85/Introducing-Kogito-9-320.jpg)
![GraalVM Limitations
Dynaminc Classloading
Deloying jars, wars, etc. at runtime impossible
public class InternalClassLoader extends ClassLoader {
public Class<?> defineClass( String name, byte[] bytecode ) {
return defineClass( name, bytecode, 0, bytecode.length );
}
}
JVMTI, JMX + other
native VM interfaces
No agents â No JRebel, Byteman, profilers, tracers
Miscellaneous
âą
Security Manager
âą finalize() (depreceated anyway)
âą InvokeDynamic and MethodHandle](https://image.slidesharecdn.com/kogitodevnation-190718161939/85/Introducing-Kogito-10-320.jpg)
![GraalVM Limitations
Dynaminc Classloading
Deloying jars, wars, etc. at runtime impossible
public class InternalClassLoader extends ClassLoader {
public Class<?> defineClass( String name, byte[] bytecode ) {
return defineClass( name, bytecode, 0, bytecode.length );
}
}
JVMTI, JMX + other
native VM interfaces
No agents â No JRebel, Byteman, profilers, tracers
Miscellaneous
âą
Security Manager
âą finalize() (depreceated anyway)
âą InvokeDynamic and MethodHandle](https://image.slidesharecdn.com/kogitodevnation-190718161939/85/Introducing-Kogito-11-320.jpg)
![GraalVM Limitations
Dynaminc Classloading
Deloying jars, wars, etc. at runtime impossible
public class InternalClassLoader extends ClassLoader {
public Class<?> defineClass( String name, byte[] bytecode ) {
return defineClass( name, bytecode, 0, bytecode.length );
}
}
JVMTI, JMX + other
native VM interfaces
No agents â No JRebel, Byteman, profilers, tracers
Miscellaneous
âą
Security Manager
âą finalize() (depreceated anyway)
âą InvokeDynamic and MethodHandle
Reflection
Requires registration (closed world assumption)](https://image.slidesharecdn.com/kogitodevnation-190718161939/85/Introducing-Kogito-12-320.jpg)
![GraalVM Limitations
Dynaminc Classloading
Deloying jars, wars, etc. at runtime impossible
public class InternalClassLoader extends ClassLoader {
public Class<?> defineClass( String name, byte[] bytecode ) {
return defineClass( name, bytecode, 0, bytecode.length );
}
}
JVMTI, JMX + other
native VM interfaces
No agents â No JRebel, Byteman, profilers, tracers
Miscellaneous
âą
Security Manager
âą finalize() (depreceated anyway)
âą InvokeDynamic and MethodHandle
[
{
"name" : "org.domain.model.Person",
"allPublicConstructors" : true,
"allPublicMethods" : true
}
]
Reflection
Requires registration (closed world assumption)
-H:ReflectionConfigurationFiles=src/main/resources/reflection.json](https://image.slidesharecdn.com/kogitodevnation-190718161939/85/Introducing-Kogito-13-320.jpg)
![public class InternalClassLoader extends ClassLoader {
public Class<?> defineClass( String name, byte[] bytecode ) {
throw new UnsupportedOperationException();
}
}
Drools on GraalVM â other refactors
Dynamic class definition
is no longer necessary](https://image.slidesharecdn.com/kogitodevnation-190718161939/85/Introducing-Kogito-18-320.jpg)
![public class InternalClassLoader extends ClassLoader {
public Class<?> defineClass( String name, byte[] bytecode ) {
throw new UnsupportedOperationException();
}
}
Drools on GraalVM â other refactors
Dynamic class definition
is no longer necessary
<?xml version="1.0" encoding="UTF-8"?>
<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule">
<kbase name="simpleKB"
packages="org.drools.simple.project">
<ksession name="simpleKS" default="true"/>
</kbase>
</kmodule>
var m = KieServices.get().newKieModuleModel();
var kb = m.newKieBaseModel("simpleKB");
kb.setEventProcessingMode(CLOUD);
kb.addPackage("org.drools.simple.project");
var ks = kb.newKieSessionModel("simpleKS");
ks.setDefault(true);
ks.setType(STATEFUL);
ks.setClockType(ClockTypeOption.get("realtime"));](https://image.slidesharecdn.com/kogitodevnation-190718161939/85/Introducing-Kogito-19-320.jpg)
![public class InternalClassLoader extends ClassLoader {
public Class<?> defineClass( String name, byte[] bytecode ) {
throw new UnsupportedOperationException();
}
}
Drools on GraalVM â other refactors
Dynamic class definition
is no longer necessary
<?xml version="1.0" encoding="UTF-8"?>
<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule">
<kbase name="simpleKB"
packages="org.drools.simple.project">
<ksession name="simpleKS" default="true"/>
</kbase>
</kmodule>
var m = KieServices.get().newKieModuleModel();
var kb = m.newKieBaseModel("simpleKB");
kb.setEventProcessingMode(CLOUD);
kb.addPackage("org.drools.simple.project");
var ks = kb.newKieSessionModel("simpleKS");
ks.setDefault(true);
ks.setType(STATEFUL);
ks.setClockType(ClockTypeOption.get("realtime"));
org.kie.api.io.KieResources =
org.drools.core.io.impl.ResourceFactoryServiceImpl
org.kie.api.marshalling.KieMarshallers =
org.drools.core.marshalling.MarshallerProviderImpl
org.kie.api.concurrent.KieExecutors =
org.drools.core.concurrent.ExecutorProviderImpl
Map<Class<?>, Object> serviceMap = new HashMap<>();
void wireServices() {
serviceMap.put( ServiceInterface.class,
Class.forName("org.drools.ServiceImpl")
.newInstance());
// ⊠more services here
}](https://image.slidesharecdn.com/kogitodevnation-190718161939/85/Introducing-Kogito-20-320.jpg)
Introducing Kogito
- 1. How and why I turned my old Java projects into a first-class serverless component by Mario Fusco Red Hat â Principal Software Engineer @mariofusco
- 2. â A cloud-native development, deployment and execution platform for business automation: â Rules and Decisions (Drools) â Processes and Cases (jBPM) â ... under the covers â the backbone is code generation based on business assets â executable model for the process/rule/decision definitions â type safe data model that encapsulates variables â REST api for each public business process/decision/rule Introducing
- 4. Cool, but ... how did we get there? A minimal agenda âźGraalVM features and limitations âźHow (and why) we made Drools natively compilable on GraalVM âźHow we integrated Kogito with Quarkus: creating a Quarkus extension âźEnabling hot reload of rules, decision tables and processes âźOne last demo
- 5. What is used by Quarkus âą A polyglot VM with cross-language JIT supporting â Java Bytecode and JVM languages â Interop with different languages â Dynamic languages through Truffle API âą Cross-language interop out of the box â Simple AST-based interpreter â JIT across language boundaries âą Support for native binary compilation (SubstrateVM) â faster boot-up â lower memory footprint
- 6. AoT compilation with GraalVM âą Static analysis âą Closed world assumption âą Dead code elimination: Â Â Â Â classes, fields, methods, branches
- 7. AoT compilation with GraalVM âą Static analysis âą Closed world assumption âą Dead code elimination:     classes, fields, methods, branches đ Fast process start đŹ Less memory đŸ Small size on disk
- 8. GraalVM Limitations Dynaminc Classloading Deloying jars, wars, etc. at runtime impossible public class InternalClassLoader extends ClassLoader { public Class<?> defineClass( String name, byte[] bytecode ) { return defineClass( name, bytecode, 0, bytecode.length ); } }
- 9. GraalVM Limitations Dynaminc Classloading Deloying jars, wars, etc. at runtime impossible public class InternalClassLoader extends ClassLoader { public Class<?> defineClass( String name, byte[] bytecode ) { return defineClass( name, bytecode, 0, bytecode.length ); } }
- 10. GraalVM Limitations Dynaminc Classloading Deloying jars, wars, etc. at runtime impossible public class InternalClassLoader extends ClassLoader { public Class<?> defineClass( String name, byte[] bytecode ) { return defineClass( name, bytecode, 0, bytecode.length ); } } JVMTI, JMX + other native VM interfaces No agents â No JRebel, Byteman, profilers, tracers Miscellaneous âą Security Manager âą finalize() (depreceated anyway) âą InvokeDynamic and MethodHandle
- 11. GraalVM Limitations Dynaminc Classloading Deloying jars, wars, etc. at runtime impossible public class InternalClassLoader extends ClassLoader { public Class<?> defineClass( String name, byte[] bytecode ) { return defineClass( name, bytecode, 0, bytecode.length ); } } JVMTI, JMX + other native VM interfaces No agents â No JRebel, Byteman, profilers, tracers Miscellaneous âą Security Manager âą finalize() (depreceated anyway) âą InvokeDynamic and MethodHandle
- 12. GraalVM Limitations Dynaminc Classloading Deloying jars, wars, etc. at runtime impossible public class InternalClassLoader extends ClassLoader { public Class<?> defineClass( String name, byte[] bytecode ) { return defineClass( name, bytecode, 0, bytecode.length ); } } JVMTI, JMX + other native VM interfaces No agents â No JRebel, Byteman, profilers, tracers Miscellaneous âą Security Manager âą finalize() (depreceated anyway) âą InvokeDynamic and MethodHandle Reflection Requires registration (closed world assumption)
- 13. GraalVM Limitations Dynaminc Classloading Deloying jars, wars, etc. at runtime impossible public class InternalClassLoader extends ClassLoader { public Class<?> defineClass( String name, byte[] bytecode ) { return defineClass( name, bytecode, 0, bytecode.length ); } } JVMTI, JMX + other native VM interfaces No agents â No JRebel, Byteman, profilers, tracers Miscellaneous âą Security Manager âą finalize() (depreceated anyway) âą InvokeDynamic and MethodHandle [ { "name" : "org.domain.model.Person", "allPublicConstructors" : true, "allPublicMethods" : true } ] Reflection Requires registration (closed world assumption) -H:ReflectionConfigurationFiles=src/main/resources/reflection.json
- 14. Drools on GraalVM - Executable Model rule "Older than Mark" when $p1: Person( name == "Mark" ) $p2: Person( name != "Mark", age > $p1.age ) then System.out.println( $p1.getName() + " is older than " + $p2.getName() ); end Variable<Person> markV = declarationOf( Person.class ); Variable<Person> olderV = declarationOf( Person.class ); Rule rule = rule( "Older than Mark" ) .build( pattern(markV) .expr("exprA", p -> p.getName().equals( "Mark" ), alphaIndexedBy( String.class, ConstraintType.EQUAL, 1, p -> p.getName(), "Mark" ), reactOn( "name", "age" )), pattern(olderV) .expr("exprB", p -> !p.getName().equals("Mark"), alphaIndexedBy( String.class, ConstraintType.NOT_EQUAL, 1, p -> p.getName(), "Mark" ), reactOn( "name" )) .expr("exprC", markV, (p1, p2) -> p1.getAge() > p2.getAge(), betaIndexedBy( int.class, ConstraintType.GREATER_THAN, 0, p -> p.getAge(), p -> p.getAge() ), reactOn( "age" )), on(olderV, markV).execute((p1, p2) -> System.out.println( p1.getName() + " is older than " + p2.getName() )) )
- 15. Drools on GraalVM - Executable Model rule "Older than Mark" when $p1: Person( name == "Mark" ) $p2: Person( name != "Mark", age > $p1.age ) then System.out.println( $p1.getName() + " is older than " + $p2.getName() ); end Variable<Person> markV = declarationOf( Person.class ); Variable<Person> olderV = declarationOf( Person.class ); Rule rule = rule( "Older than Mark" ) .build( pattern(markV) .expr("exprA", p -> p.getName().equals( "Mark" ), alphaIndexedBy( String.class, ConstraintType.EQUAL, 1, p -> p.getName(), "Mark" ), reactOn( "name", "age" )), pattern(olderV) .expr("exprB", p -> !p.getName().equals("Mark"), alphaIndexedBy( String.class, ConstraintType.NOT_EQUAL, 1, p -> p.getName(), "Mark" ), reactOn( "name" )) .expr("exprC", markV, (p1, p2) -> p1.getAge() > p2.getAge(), betaIndexedBy( int.class, ConstraintType.GREATER_THAN, 0, p -> p.getAge(), p -> p.getAge() ), reactOn( "age" )), on(olderV, markV).execute((p1, p2) -> System.out.println( p1.getName() + " is older than " + p2.getName() )) )
- 16. Drools on GraalVM - Executable Model rule "Older than Mark" when $p1: Person( name == "Mark" ) $p2: Person( name != "Mark", age > $p1.age ) then System.out.println( $p1.getName() + " is older than " + $p2.getName() ); end Variable<Person> markV = declarationOf( Person.class ); Variable<Person> olderV = declarationOf( Person.class ); Rule rule = rule( "Older than Mark" ) .build( pattern(markV) .expr("exprA", p -> p.getName().equals( "Mark" ), alphaIndexedBy( String.class, ConstraintType.EQUAL, 1, p -> p.getName(), "Mark" ), reactOn( "name", "age" )), pattern(olderV) .expr("exprB", p -> !p.getName().equals("Mark"), alphaIndexedBy( String.class, ConstraintType.NOT_EQUAL, 1, p -> p.getName(), "Mark" ), reactOn( "name" )) .expr("exprC", markV, (p1, p2) -> p1.getAge() > p2.getAge(), betaIndexedBy( int.class, ConstraintType.GREATER_THAN, 0, p -> p.getAge(), p -> p.getAge() ), reactOn( "age" )), on(olderV, markV).execute((p1, p2) -> System.out.println( p1.getName() + " is older than " + p2.getName() )) ) Executable model Indexes and reactivity explicitly defined
- 17. Executable Model at a glance âą A pure Java DSL for Drools rules authoring âą A pure Java canonical representation of a rule base âą Automatically generated by Maven plugin or Quarkus extension â Can be embedded in jar â Faster boot âą Improve Backward/Forward compatibility âą Allow for faster prototyping and experimentation of new features âą Prerequisite to make Drools natively compilable on GraalVM
- 18. public class InternalClassLoader extends ClassLoader { public Class<?> defineClass( String name, byte[] bytecode ) { throw new UnsupportedOperationException(); } } Drools on GraalVM â other refactors Dynamic class definition is no longer necessary
- 19. public class InternalClassLoader extends ClassLoader { public Class<?> defineClass( String name, byte[] bytecode ) { throw new UnsupportedOperationException(); } } Drools on GraalVM â other refactors Dynamic class definition is no longer necessary <?xml version="1.0" encoding="UTF-8"?> <kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule"> <kbase name="simpleKB" packages="org.drools.simple.project"> <ksession name="simpleKS" default="true"/> </kbase> </kmodule> var m = KieServices.get().newKieModuleModel(); var kb = m.newKieBaseModel("simpleKB"); kb.setEventProcessingMode(CLOUD); kb.addPackage("org.drools.simple.project"); var ks = kb.newKieSessionModel("simpleKS"); ks.setDefault(true); ks.setType(STATEFUL); ks.setClockType(ClockTypeOption.get("realtime"));
- 20. public class InternalClassLoader extends ClassLoader { public Class<?> defineClass( String name, byte[] bytecode ) { throw new UnsupportedOperationException(); } } Drools on GraalVM â other refactors Dynamic class definition is no longer necessary <?xml version="1.0" encoding="UTF-8"?> <kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule"> <kbase name="simpleKB" packages="org.drools.simple.project"> <ksession name="simpleKS" default="true"/> </kbase> </kmodule> var m = KieServices.get().newKieModuleModel(); var kb = m.newKieBaseModel("simpleKB"); kb.setEventProcessingMode(CLOUD); kb.addPackage("org.drools.simple.project"); var ks = kb.newKieSessionModel("simpleKS"); ks.setDefault(true); ks.setType(STATEFUL); ks.setClockType(ClockTypeOption.get("realtime")); org.kie.api.io.KieResources = org.drools.core.io.impl.ResourceFactoryServiceImpl org.kie.api.marshalling.KieMarshallers = org.drools.core.marshalling.MarshallerProviderImpl org.kie.api.concurrent.KieExecutors = org.drools.core.concurrent.ExecutorProviderImpl Map<Class<?>, Object> serviceMap = new HashMap<>(); void wireServices() { serviceMap.put( ServiceInterface.class, Class.forName("org.drools.ServiceImpl") .newInstance()); // ⊠more services here }
- 21. JVM vs. Native
- 22. Introducing âą A Framework for writing (fast and lightweight) Java applications
- 23. Introducing âą A Framework for writing (fast and lightweight) Java applications âą (Optionally) allowing generation of native executable via GraalVM *.class QUARKUS optimized jar native executable JVM Maven/Gradle plugin
- 24. Introducing âą A Framework for writing (fast and lightweight) Java applications âą (Optionally) allowing generation of native executable via GraalVM âą Based on existing standard â Servlet â JAX-RS â JPA, JDBC â CDI â Bean Validation â Transactions â Logging â Microprofile *.class QUARKUS optimized jar native executable JVM Maven/Gradle plugin
- 25. Introducing âą A Framework for writing (fast and lightweight) Java applications âą (Optionally) allowing generation of native executable via GraalVM âą Based on existing standard â Servlet â JAX-RS â JPA, JDBC â CDI â Bean Validation â Transactions â Logging â Microprofile âą Out-of-the-box integration with libraries that you already know *.class QUARKUS optimized jar native executable JVM Maven/Gradle plugin
- 26. Compile generate Java sources in memory Integrating Quarkus and Kogito Writing a Quarkus extension public class KogitoAssetProcessor { @BuildStep(providesCapabilities = "io.quarkus.kogito") public void generateModel( ArchiveRootBuildItem root, BuildProducer<GeneratedBeanBuildItem> generatedBeans, LaunchModeBuildItem launchMode) throws IOException { LaunchMode launchMode = launchModeItem.getLaunchMode(); if (hotReload(launchMode)) { return; } ApplicationGenerator appGen = createApplicationGenerator(root, launchMode); Collection<GeneratedFile> generatedFiles = appGen.generate(); if (!generatedFiles.isEmpty()) { MemoryFileSystem trgMfs = new MemoryFileSystem(); CompilationResult result = compile( root, trgMfs, generatedFiles, generatedBeans, launchMode ); register( trgMfs, generatedBeans, launchMode, result ); } } } Avoid recompiling everything during an hot reload Generate executable model source files Register generated classes into Quarkus runtime
- 27. Kogito hot reload public class KogitoCompilationProvider extends JavaCompilationProvider { @Override public final void compile(Set<File> filesToCompile, Context context) { File outputDirectory = context.getOutputDirectory(); try { ApplicationGenerator appGen = new ApplicationGenerator( appPackageName, outputDirectory ); Generator generator = addGenerator(appGen, filesToCompile, context); Collection<GeneratedFile> generatedFiles = generator.generate(); HashSet<File> generatedSourceFiles = new HashSet<>(); for (GeneratedFile file : generatedFiles) { Path path = pathOf(outputDirectory.getPath(), file.relativePath()); Files.write(path, file.contents()); generatedSourceFiles.add(path.toFile()); } super.compile(generatedSourceFiles, context); } catch (IOException e) { throw new KogitoCompilerException(e); } } } Write regenerated source in the file system Extends Java hot reload mechanism provided by Quarkus Regenerate executable model only for changed sources Pass the list of generated sources to super in order to recompile them
- 28. A simple Quarkus-based REST endpoint using Kogito @Path("/candrink/{name}/{age}") public class CanDrinkResource { @Inject @Named("canDrinkKS") RuleUnit<SessionMemory> ruleUnit; @GET @Produces(MediaType.TEXT_PLAIN) public String canDrink( @PathParam("name") String name, @PathParam("age") int age ) { SessionMemory memory = new SessionMemory(); Result result = new Result(); memory.add(result); memory.add(new Person( name, age )); ruleUnit.evaluate(memory); return result.toString(); } }
- 29. Whatâs next? Donât miss Maciej Swiderskiâs DevNationLive talk on the 5th of September: Event-driven business automation powered by cloud native Java âą Rule bases modularization via Rule Units âą Rule Units orchestration through jBPM workflows âą Seamless integration with Camel routes, Kafka streams, ... âą Automatic REST endpoint generation returning result of DRL queries
- 30. Mario Fusco Red Hat â Principal Software Engineer mario.fusco@gmail.com twitter: @mariofusco Q A Thanks ... Questions?