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Provisions Tomcat Pods and deploys Webapplications in them

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package io.javaoperatorsdk.operator.sample;

import java.util.Objects;

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

import io.fabric8.kubernetes.api.model.apps.Deployment;
import io.fabric8.kubernetes.api.model.apps.DeploymentStatus;
import io.javaoperatorsdk.operator.api.reconciler.Context;
import io.javaoperatorsdk.operator.api.reconciler.ControllerConfiguration;
import io.javaoperatorsdk.operator.api.reconciler.Reconciler;
import io.javaoperatorsdk.operator.api.reconciler.UpdateControl;
import io.javaoperatorsdk.operator.api.reconciler.dependent.Dependent;

/**
 * Runs a specified number of Tomcat app server Pods. It uses a Deployment to create the Pods. Also
 * creates a Service over which the Pods can be accessed.
 */
@ControllerConfiguration(
    dependents = {
        @Dependent(type = DeploymentDependentResource.class),
        @Dependent(type = ServiceDependentResource.class)
    })
public class TomcatReconciler implements Reconciler {

  private final Logger log = LoggerFactory.getLogger(getClass());

  @Override
  public UpdateControl reconcile(Tomcat tomcat, Context context) {
    return context.getSecondaryResource(Deployment.class).map(deployment -> {
      Tomcat updatedTomcat = updateTomcatStatus(tomcat, deployment);
      log.info(
          "Updating status of Tomcat {} in namespace {} to {} ready replicas",
          tomcat.getMetadata().getName(),
          tomcat.getMetadata().getNamespace(),
          tomcat.getStatus().getReadyReplicas());
      return UpdateControl.patchStatus(updatedTomcat);
    }).orElseGet(UpdateControl::noUpdate);
  }

  private Tomcat updateTomcatStatus(Tomcat tomcat, Deployment deployment) {
    DeploymentStatus deploymentStatus =
        Objects.requireNonNullElse(deployment.getStatus(), new DeploymentStatus());
    int readyReplicas = Objects.requireNonNullElse(deploymentStatus.getReadyReplicas(), 0);
    TomcatStatus status = new TomcatStatus();
    status.setReadyReplicas(readyReplicas);
    tomcat.setStatus(status);
    return tomcat;
  }
}