Polishing the core module by adding missing Javadoc and do some refactoring

core/src/main/java/org/jboss/intersmash/annotations/Intersmash.java

@@ -23,6 +23,10 @@
 import org.jboss.intersmash.junit5.IntersmashExtension;
 import org.junit.jupiter.api.extension.ExtendWith;
 
+/**
+ * Annotation that is applied to a test class, so that the JUnit engine would use the {@link IntersmashExtension} to
+ * run the Intersmash provisioning workflow, and execute the related tests.
+ */
 @Retention(RetentionPolicy.RUNTIME)
 @Target(ElementType.TYPE)
 @ExtendWith(IntersmashExtension.class)

core/src/main/java/org/jboss/intersmash/annotations/Service.java

@@ -23,6 +23,10 @@
 
 import org.jboss.intersmash.application.Application;
 
+/**
+ * Annotation to define an Intersmash service, i.e. the abstraction of a given runtime workload.
+ * Examples are: a WildFly application service, a Keycloak service etc. on OpenShift.
+ */
 @Retention(RetentionPolicy.RUNTIME)
 @Target(ElementType.TYPE)
 @Repeatable(Services.class)

core/src/main/java/org/jboss/intersmash/annotations/Services.java

@@ -20,6 +20,9 @@
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
+/**
+ * Annotation to define a group of Intersmash {@link Service} instances.
+ */
 @Retention(RetentionPolicy.RUNTIME)
 @Target(ElementType.TYPE)
 public @interface Services {

core/src/main/java/org/jboss/intersmash/junit5/IntersmashExecutionCondition.java

@@ -29,6 +29,10 @@
 import cz.xtf.core.openshift.OpenShifts;
 import lombok.extern.slf4j.Slf4j;
 
+/**
+ * Implements a JUnit {@link ExecutionCondition} that is used to control whether a test class workflow can be managed by
+ * {@link IntersmashExtension}
+ */
 @Slf4j
 public class IntersmashExecutionCondition implements ExecutionCondition {
 

core/src/main/java/org/jboss/intersmash/junit5/IntersmashExtension.java

@@ -47,6 +47,10 @@
 import cz.xtf.core.openshift.OpenShifts;
 import lombok.extern.slf4j.Slf4j;
 
+/**
+ * Intersmash JUnit extension that handles the process of provisioning a cross-product scenario before starting the
+ * test execution.
+ */
 @Slf4j
 public class IntersmashExtension implements BeforeAllCallback, AfterAllCallback, TestInstancePostProcessor {
 

core/src/main/java/org/jboss/intersmash/provision/Provisioner.java

@@ -20,7 +20,7 @@
 import org.jboss.intersmash.application.Application;
 
 /**
- * Application provisioner for deploying and undeploying the application.
+ * Application provisioner for deploying and undeploying a service, represented by a given {@link Application} instance.
  */
 public interface Provisioner<T extends Application> {
 

core/src/main/java/org/jboss/intersmash/provision/ProvisionerFactory.java

@@ -17,6 +17,10 @@
 
 import org.jboss.intersmash.application.Application;
 
+/**
+ * Define the contract for classes that return a suitable {@link Provisioner} for a given {@link Application} class.
+ * @param <T> The type of the {@link Provisioner} that the factory implementation shall return.
+ */
 public interface ProvisionerFactory<T extends Provisioner> {
 
 	/**

core/src/main/java/org/jboss/intersmash/provision/ProvisionerManager.java

@@ -19,8 +19,10 @@
 
 import org.jboss.intersmash.application.Application;
 
+/**
+ * Manager class to load the suitable {@link Provisioner} for a given {@link Application} instance, based on SPI.
+ */
 public class ProvisionerManager {
-
 	/**
 	 * Get application provisioner based on interfaces the application does implement.
 	 *

core/src/main/java/org/jboss/intersmash/provision/openshift/FailFastUtils.java

@@ -22,6 +22,10 @@
 import cz.xtf.core.waiting.failfast.FailFastBuilder;
 import cz.xtf.core.waiting.failfast.FailFastCheck;
 
+/**
+ * Helper class that leverages the XTF library fail-fast APIs in methods that can be used to control the
+ * Intersmash provisioning workflow.
+ */
 public class FailFastUtils {
 	private static String[] failFastEventMessages = new String[] {
 			"Failed to pull image.*",

core/src/main/java/org/jboss/intersmash/provision/openshift/OpenShiftUtils.java

@@ -19,6 +19,10 @@
 
 import cz.xtf.core.openshift.OpenShift;
 
+/**
+ * Helper class that leverages the XTF library {@link OpenShift} APIs in methods that can be used to control the
+ * Intersmash provisioning workflow.
+ */
 public class OpenShiftUtils {
 	public static void deleteResourcesWithLabel(OpenShift openShift, String labelKey, String labelValue) {
 		openShift.deploymentConfigs().withLabel(labelKey, labelValue).delete();

core/src/main/java/org/jboss/intersmash/provision/openshift/WaitersUtil.java

@@ -28,6 +28,10 @@
 import io.fabric8.kubernetes.api.model.EndpointSubset;
 import io.fabric8.kubernetes.api.model.Endpoints;
 
+/**
+ * Helper class that leverages the XTF library {@link Waiter} APIs in methods that can be used to control the
+ * Intersmash provisioning workflow.
+ */
 public class WaitersUtil {
 	public static Waiter serviceEndpointsAreReady(OpenShift openShift, String serviceName, int numOfPods, Integer... ports) {
 		return new SimpleWaiter(() -> {

core/src/main/java/org/jboss/intersmash/provision/openshift/operator/resources/CatalogSource.java

@@ -17,6 +17,9 @@
 
 import io.fabric8.openshift.api.model.operatorhub.v1alpha1.CatalogSourceBuilder;
 
+/**
+ * Wrapper for creating and using {@link io.fabric8.openshift.api.model.operatorhub.v1alpha1.CatalogSource}
+ */
 public class CatalogSource extends io.fabric8.openshift.api.model.operatorhub.v1alpha1.CatalogSource
 		implements OpenShiftResource<CatalogSource> {
 

core/src/main/java/org/jboss/intersmash/provision/openshift/operator/resources/Subscription.java

@@ -25,10 +25,9 @@
 import io.fabric8.openshift.api.model.operatorhub.v1alpha1.SubscriptionFluent;
 
 /**
- * <p>
  * The Subscription configures when and how to update a ClusterService, binds a ClusterService to a channel in a
  * CatalogSource and configures the update strategy for a ClusterService (automatic, manual approval, etc).
- * </p>
+ *
  * <p>This class is a wrapper for {@link io.fabric8.openshift.api.model.operatorhub.v1alpha1.Subscription} which
  * adds some capabilities</p>
  * <p>