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Provisions an nginx Webserver based on a CRD with give html

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package io.javaoperatorsdk.operator.sample;

import java.util.Arrays;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import io.fabric8.kubernetes.api.model.ConfigMap;
import io.javaoperatorsdk.operator.api.reconciler.*;
import io.javaoperatorsdk.operator.processing.dependent.kubernetes.KubernetesDependentResourceConfigBuilder;
import io.javaoperatorsdk.operator.processing.dependent.workflow.Workflow;
import io.javaoperatorsdk.operator.processing.dependent.workflow.WorkflowBuilder;
import io.javaoperatorsdk.operator.processing.event.source.EventSource;
import io.javaoperatorsdk.operator.sample.customresource.WebPage;
import io.javaoperatorsdk.operator.sample.dependentresource.*;

import static io.javaoperatorsdk.operator.sample.Utils.*;
import static io.javaoperatorsdk.operator.sample.WebPageManagedDependentsReconciler.SELECTOR;

/**
 * Shows how to implement reconciler using standalone dependent resources.
 */
@ControllerConfiguration
public class WebPageStandaloneDependentsReconciler
    implements Reconciler, ErrorStatusHandler, EventSourceInitializer {

  private static final Logger log =
      LoggerFactory.getLogger(WebPageStandaloneDependentsReconciler.class);

  private Workflow workflow;

  public WebPageStandaloneDependentsReconciler() {
    workflow = createDependentResourcesAndWorkflow();
  }

  @Override
  public Map prepareEventSources(EventSourceContext context) {
    return EventSourceInitializer.eventSourcesFromWorkflow(context, workflow);
  }

  @Override
  public UpdateControl reconcile(WebPage webPage, Context context)
      throws Exception {
    simulateErrorIfRequested(webPage);

    if (!isValidHtml(webPage)) {
      return UpdateControl.patchStatus(setInvalidHtmlErrorMessage(webPage));
    }

    workflow.reconcile(webPage, context);

    webPage.setStatus(
        createStatus(
            context.getSecondaryResource(ConfigMap.class).orElseThrow().getMetadata().getName()));
    return UpdateControl.patchStatus(webPage);
  }

  @Override
  public ErrorStatusUpdateControl updateErrorStatus(
      WebPage resource, Context retryInfo, Exception e) {
    return handleError(resource, e);
  }

  @SuppressWarnings({"unchecked", "rawtypes"})
  private Workflow createDependentResourcesAndWorkflow() {
    var configMapDR = new ConfigMapDependentResource();
    var deploymentDR = new DeploymentDependentResource();
    var serviceDR = new ServiceDependentResource();
    var ingressDR = new IngressDependentResource();

    Arrays.asList(configMapDR, deploymentDR, serviceDR, ingressDR)
        .forEach(dr -> dr.configureWith(new KubernetesDependentResourceConfigBuilder()
            .withLabelSelector(SELECTOR + "=true").build()));

    return new WorkflowBuilder()
        .addDependentResource(configMapDR)
        .addDependentResource(deploymentDR)
        .addDependentResource(serviceDR)
        .addDependentResource(ingressDR)
        .withReconcilePrecondition(new ExposedIngressCondition())
        .build();
  }


}