gt:                     && (!maxThreads.isDefined() || maxThreads.asInt() <= 0)) {
context: /*
   * JBoss, Home of Professional Open Source.
   * Copyright 2013, Red Hat, Inc., and individual contributors
   * as indicated by the @author tags. See the copyright.txt file in the
   * distribution for a full listing of individual contributors.
   *
   * This is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as
   * published by the Free Software Foundation; either version 2.1 of
   * the License, or (at your option) any later version.
   *
   * This software is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this software; if not, write to the Free
   * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
   * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
   */
  package org.jboss.as.ee.subsystem;
  
  import org.glassfish.enterprise.concurrent.AbstractManagedExecutorService;
  import org.glassfish.enterprise.concurrent.ManagedExecutorServiceAdapter;
  import org.jboss.as.controller.AttributeDefinition;
  import org.jboss.as.controller.OperationContext;
  import org.jboss.as.controller.OperationFailedException;
  import org.jboss.as.controller.OperationStepHandler;
  import org.jboss.as.controller.PathAddress;
  import org.jboss.as.controller.PathElement;
  import org.jboss.as.controller.ReloadRequiredWriteAttributeHandler;
  import org.jboss.as.controller.ServiceRemoveStepHandler;
  import org.jboss.as.controller.SimpleAttributeDefinition;
  import org.jboss.as.controller.SimpleAttributeDefinitionBuilder;
  import org.jboss.as.controller.SimpleResourceDefinition;
  import org.jboss.as.controller.capability.RuntimeCapability;
  import org.jboss.as.controller.client.helpers.MeasurementUnit;
  import org.jboss.as.controller.descriptions.ResourceDescriptionResolver;
  import org.jboss.as.controller.operations.validation.EnumValidator;
  import org.jboss.as.controller.operations.validation.IntRangeValidator;
  import org.jboss.as.controller.operations.validation.LongRangeValidator;
  import org.jboss.as.controller.operations.validation.StringLengthValidator;
  import org.jboss.as.controller.registry.AttributeAccess;
  import org.jboss.as.controller.registry.ManagementResourceRegistration;
  import org.jboss.as.controller.registry.Resource;
  import org.jboss.as.controller.transform.description.DiscardAttributeChecker;
  import org.jboss.as.controller.transform.description.RejectAttributeChecker;
  import org.jboss.as.controller.transform.description.ResourceTransformationDescriptionBuilder;
  import org.jboss.as.ee.concurrent.service.ManagedExecutorServiceService;
  import org.jboss.as.ee.logging.EeLogger;
  import org.jboss.dmr.ModelNode;
  import org.jboss.dmr.ModelType;
  
  /**
   * @author Eduardo Martins
   */
  public class ManagedExecutorServiceResourceDefinition extends SimpleResourceDefinition {
  
      /**
       * the resource definition's dynamic runtime capability
       */
      public static final RuntimeCapability<Void> CAPABILITY = RuntimeCapability.Builder.of("org.wildfly.ee.concurrent.executor", true, ManagedExecutorServiceAdapter.class)
              .build();
  
      public static final String JNDI_NAME = "jndi-name";
      public static final String CONTEXT_SERVICE = "context-service";
      public static final String THREAD_FACTORY = "thread-factory";
      public static final String THREAD_PRIORITY = "thread-priority";
      public static final String HUNG_TASK_TERMINATION_PERIOD = "hung-task-termination-period";
      public static final String HUNG_TASK_THRESHOLD = "hung-task-threshold";
      public static final String LONG_RUNNING_TASKS = "long-running-tasks";
      public static final String CORE_THREADS = "core-threads";
      public static final String MAX_THREADS = "max-threads";
      public static final String KEEPALIVE_TIME = "keepalive-time";
      public static final String QUEUE_LENGTH = "queue-length";
      public static final String REJECT_POLICY = "reject-policy";
  
      public static final SimpleAttributeDefinition JNDI_NAME_AD =
              new SimpleAttributeDefinitionBuilder(JNDI_NAME, ModelType.STRING, false)
                      .setAllowExpression(true)
                      .setFlags(AttributeAccess.Flag.RESTART_RESOURCE_SERVICES)
                      .build();
  
      public static final SimpleAttributeDefinition CONTEXT_SERVICE_AD =
              new SimpleAttributeDefinitionBuilder(CONTEXT_SERVICE, ModelType.STRING, true)
                      .setAllowExpression(false)
                      .setValidator(new StringLengthValidator(0, true))
                      .setFlags(AttributeAccess.Flag.RESTART_RESOURCE_SERVICES)
                      .setCapabilityReference(ContextServiceResourceDefinition.CAPABILITY.getName(), CAPABILITY)
                      .build();
  
      public static final SimpleAttributeDefinition THREAD_FACTORY_AD =
              new SimpleAttributeDefinitionBuilder(THREAD_FACTORY, ModelType.STRING, true)
                      .setAllowExpression(false)
                      .setValidator(new StringLengthValidator(0, true))
                      .setFlags(AttributeAccess.Flag.RESTART_RESOURCE_SERVICES)
                      .setCapabilityReference(ManagedThreadFactoryResourceDefinition.CAPABILITY.getName(), CAPABILITY)
                      .setDeprecated(EESubsystemModel.Version.v5_0_0)
                      .setAlternatives(THREAD_PRIORITY)
                      .build();
  
      public static final SimpleAttributeDefinition THREAD_PRIORITY_AD =
              new SimpleAttributeDefinitionBuilder(THREAD_PRIORITY, ModelType.INT, true)
                      .setAllowExpression(true)
                      .setValidator(new IntRangeValidator(Thread.MIN_PRIORITY, Thread.MAX_PRIORITY, true, true))
                      .setDefaultValue(new ModelNode(Thread.NORM_PRIORITY))
                      .setFlags(AttributeAccess.Flag.RESTART_RESOURCE_SERVICES)
                      .setAlternatives(THREAD_FACTORY)
                      .build();
      public static final SimpleAttributeDefinition HUNG_TASK_TERMINATION_PERIOD_AD =
              new SimpleAttributeDefinitionBuilder(HUNG_TASK_TERMINATION_PERIOD, ModelType.LONG, true)
                      .setAllowExpression(true)
                      .setValidator(new LongRangeValidator(0, Long.MAX_VALUE, true, true))
                      .setMeasurementUnit(MeasurementUnit.MILLISECONDS)
                      .setDefaultValue(ModelNode.ZERO)
                      .setFlags(AttributeAccess.Flag.RESTART_RESOURCE_SERVICES)
                      .build();
  
      public static final SimpleAttributeDefinition HUNG_TASK_THRESHOLD_AD =
              new SimpleAttributeDefinitionBuilder(HUNG_TASK_THRESHOLD, ModelType.LONG, true)
                      .setAllowExpression(true)
                      .setValidator(new LongRangeValidator(0, Long.MAX_VALUE, true, true))
                      .setMeasurementUnit(MeasurementUnit.MILLISECONDS)
                      .setDefaultValue(ModelNode.ZERO)
                      .setFlags(AttributeAccess.Flag.RESTART_RESOURCE_SERVICES)
                      .build();
  
      public static final SimpleAttributeDefinition LONG_RUNNING_TASKS_AD =
              new SimpleAttributeDefinitionBuilder(LONG_RUNNING_TASKS, ModelType.BOOLEAN, true)
                      .setAllowExpression(true)
                      .setDefaultValue(ModelNode.FALSE)
                      .setFlags(AttributeAccess.Flag.RESTART_RESOURCE_SERVICES)
                      .build();
  
      public static final SimpleAttributeDefinition CORE_THREADS_AD =
              new SimpleAttributeDefinitionBuilder(CORE_THREADS, ModelType.INT, true)
                      .setAllowExpression(true)
                      .setValidator(new IntRangeValidator(0, Integer.MAX_VALUE, true, true))
                      .setFlags(AttributeAccess.Flag.RESTART_RESOURCE_SERVICES)
                      .build();
  
      public static final SimpleAttributeDefinition MAX_THREADS_AD =
              new SimpleAttributeDefinitionBuilder(MAX_THREADS, ModelType.INT, true)
                      .setAllowExpression(true)
                      .setValidator(new IntRangeValidator(0, Integer.MAX_VALUE, true, true))
                      .setFlags(AttributeAccess.Flag.RESTART_RESOURCE_SERVICES)
                      .build();
  
      public static final SimpleAttributeDefinition KEEPALIVE_TIME_AD =
              new SimpleAttributeDefinitionBuilder(KEEPALIVE_TIME, ModelType.LONG, true)
                      .setAllowExpression(true)
                      .setValidator(new LongRangeValidator(0, Long.MAX_VALUE, true, true))
                      .setMeasurementUnit(MeasurementUnit.MILLISECONDS)
                      .setFlags(AttributeAccess.Flag.RESTART_RESOURCE_SERVICES)
                      .setDefaultValue(new ModelNode(60000))
                      .build();
  
      public static final SimpleAttributeDefinition QUEUE_LENGTH_AD =
              new SimpleAttributeDefinitionBuilder(QUEUE_LENGTH, ModelType.INT, true)
                      .setAllowExpression(true)
                      .setValidator(new IntRangeValidator(0, Integer.MAX_VALUE, true, true))
                      .setFlags(AttributeAccess.Flag.RESTART_RESOURCE_SERVICES)
                      .build();
  
      public static final SimpleAttributeDefinition REJECT_POLICY_AD =
              new SimpleAttributeDefinitionBuilder(REJECT_POLICY, ModelType.STRING, true)
                      .setAllowExpression(true)
                      .setFlags(AttributeAccess.Flag.RESTART_RESOURCE_SERVICES)
                      .setDefaultValue(new ModelNode(AbstractManagedExecutorService.RejectPolicy.ABORT.toString()))
                      .setValidator(EnumValidator.create(AbstractManagedExecutorService.RejectPolicy.class))
                      .build();
  
      static final SimpleAttributeDefinition[] ATTRIBUTES = {JNDI_NAME_AD, CONTEXT_SERVICE_AD, THREAD_FACTORY_AD, THREAD_PRIORITY_AD, HUNG_TASK_TERMINATION_PERIOD_AD, HUNG_TASK_THRESHOLD_AD, LONG_RUNNING_TASKS_AD, CORE_THREADS_AD, MAX_THREADS_AD, KEEPALIVE_TIME_AD, QUEUE_LENGTH_AD, REJECT_POLICY_AD};
  
      public static final PathElement PATH_ELEMENT = PathElement.pathElement(EESubsystemModel.MANAGED_EXECUTOR_SERVICE);
  
      private static final ResourceDescriptionResolver RESOLVER = EeExtension.getResourceDescriptionResolver(EESubsystemModel.MANAGED_EXECUTOR_SERVICE);
  
      /**
       * metrics op step handler
       */
      private static final ManagedExecutorServiceMetricsHandler METRICS_HANDLER = new ManagedExecutorServiceMetricsHandler.Builder<ManagedExecutorServiceService>(CAPABILITY)
              .addMetric(ManagedExecutorServiceMetricsAttributes.ACTIVE_THREAD_COUNT_AD, (context, service) -> context.getResult().set(service.getExecutorService().getRuntimeStats().getActiveThreadsCount()))
              .addMetric(ManagedExecutorServiceMetricsAttributes.COMPLETED_TASK_COUNT_AD, (context, service) -> context.getResult().set(service.getExecutorService().getRuntimeStats().getCompletedTaskCount()))
              .addMetric(ManagedExecutorServiceMetricsAttributes.CURRENT_QUEUE_SIZE_AD, (context, service) -> context.getResult().set(service.getExecutorService().getRuntimeStats().getQueueSize()))
              .addMetric(ManagedExecutorServiceMetricsAttributes.HUNG_THREAD_COUNT_AD, (context, service) -> context.getResult().set(service.getExecutorService().getRuntimeStats().getHungThreadsCount()))
              .addMetric(ManagedExecutorServiceMetricsAttributes.MAX_THREAD_COUNT_AD, (context, service) -> context.getResult().set(service.getExecutorService().getRuntimeStats().getMaxThreadsCount()))
              .addMetric(ManagedExecutorServiceMetricsAttributes.TASK_COUNT_AD, (context, service) -> context.getResult().set(service.getExecutorService().getRuntimeStats().getTaskCount()))
              .addMetric(ManagedExecutorServiceMetricsAttributes.THREAD_COUNT_AD, (context, service) -> context.getResult().set(service.getExecutorService().getRuntimeStats().getThreadsCount()))
              .build();
  
      /**
       * terminate hung threads op
       */
      private static final ManagedExecutorTerminateHungTasksOperation<ManagedExecutorServiceService> TERMINATE_HUNG_TASKS_OP = new ManagedExecutorTerminateHungTasksOperation<>(CAPABILITY, RESOLVER, service -> service.getExecutorService());
  
      /**
       *
       */
      private final boolean registerRuntimeOnly;
  
      ManagedExecutorServiceResourceDefinition(boolean registerRuntimeOnly) {
          super(new SimpleResourceDefinition.Parameters(PATH_ELEMENT, RESOLVER)
                  .setAddHandler(ManagedExecutorServiceAdd.INSTANCE)
                  .setRemoveHandler(new ServiceRemoveStepHandler(ManagedExecutorServiceAdd.INSTANCE))
                  .addCapabilities(CAPABILITY));
          this.registerRuntimeOnly = registerRuntimeOnly;
      }
  
      @Override
      public void registerOperations(ManagementResourceRegistration resourceRegistration) {
          super.registerOperations(resourceRegistration);
          TERMINATE_HUNG_TASKS_OP.registerOperation(resourceRegistration);
      }
  
      @Override
      public void registerAttributes(ManagementResourceRegistration resourceRegistration) {
          OperationStepHandler writeHandler = new ValidatingWriteHandler(ATTRIBUTES);
          for (AttributeDefinition attr : ATTRIBUTES) {
              resourceRegistration.registerReadWriteAttribute(attr, null, writeHandler);
          }
          if (registerRuntimeOnly) {
              METRICS_HANDLER.registerAttributes(resourceRegistration);
          }
      }
  
      static void registerTransformers_4_0(final ResourceTransformationDescriptionBuilder builder) {
          final ResourceTransformationDescriptionBuilder resourceBuilder = builder.addChildResource(PATH_ELEMENT);
          resourceBuilder.getAttributeBuilder()
                  .addRejectCheck(RejectAttributeChecker.UNDEFINED, CORE_THREADS_AD)
                  .end();
      }
  
      static void registerTransformers5_0(final ResourceTransformationDescriptionBuilder builder) {
          final ResourceTransformationDescriptionBuilder resourceBuilder = builder.addChildResource(PATH_ELEMENT);
          resourceBuilder.getAttributeBuilder()
                  .setDiscard(DiscardAttributeChecker.UNDEFINED, THREAD_PRIORITY_AD)
                  .addRejectCheck(RejectAttributeChecker.DEFINED, THREAD_PRIORITY_AD)
                  .end();
      }
  
      static void registerTransformers6_0(final ResourceTransformationDescriptionBuilder builder) {
          final ResourceTransformationDescriptionBuilder resourceBuilder = builder.addChildResource(PATH_ELEMENT);
          resourceBuilder.getAttributeBuilder()
                  .setDiscard(DiscardAttributeChecker.UNDEFINED, HUNG_TASK_TERMINATION_PERIOD_AD)
                  .addRejectCheck(RejectAttributeChecker.DEFINED, HUNG_TASK_TERMINATION_PERIOD_AD)
                  .end();
      }
  
      static class ValidatingWriteHandler extends ReloadRequiredWriteAttributeHandler {
          public ValidatingWriteHandler(final AttributeDefinition... definitions) {
              super(definitions);
          }
  
          @Override
          protected void validateUpdatedModel(final OperationContext context, final Resource model) throws OperationFailedException {
              context.addStep(ExecutorQueueValidationStepHandler.MODEL_VALIDATION_INSTANCE, OperationContext.Stage.MODEL);
              super.validateUpdatedModel(context, model);
          }
      }
  
      static class ExecutorQueueValidationStepHandler implements OperationStepHandler {
          static final ExecutorQueueValidationStepHandler MODEL_VALIDATION_INSTANCE = new ExecutorQueueValidationStepHandler(false);
          private final boolean isRuntimeStage;
  
          private ExecutorQueueValidationStepHandler(final boolean isRuntimeStage) {
              this.isRuntimeStage = isRuntimeStage;
          }
  
          @Override
          public void execute(final OperationContext context, final ModelNode operation) throws OperationFailedException {
              final ModelNode model = context.readResource(PathAddress.EMPTY_ADDRESS).getModel();
  
              final ModelNode coreThreads;
              final ModelNode maxThreads;
              final ModelNode queueLength;
  
              if (isRuntimeStage) {
                  coreThreads = CORE_THREADS_AD.resolveModelAttribute(context, model);
                  maxThreads = MAX_THREADS_AD.resolveModelAttribute(context, model);
                  queueLength = QUEUE_LENGTH_AD.resolveModelAttribute(context, model);
              } else {
                  coreThreads = model.get(CORE_THREADS);
                  maxThreads = model.get(MAX_THREADS);
                  queueLength = model.get(QUEUE_LENGTH);
              }
  
              if (coreThreads.getType() == ModelType.EXPRESSION
                      || maxThreads.getType() == ModelType.EXPRESSION
                      || queueLength.getType() == ModelType.EXPRESSION) {
                  context.addStep(new ExecutorQueueValidationStepHandler(true), OperationContext.Stage.RUNTIME, true);
                  return;
              }
  
              // Validate an unbounded queue
              if ((!queueLength.isDefined() || queueLength.asInt() == Integer.MAX_VALUE)
                      && coreThreads.isDefined()
                      && coreThreads.asInt() <= 0) {
                  throw EeLogger.ROOT_LOGGER.invalidCoreThreadsSize(queueLength.asString());
              }
  
              // Validate a hand-off queue
              if (queueLength.isDefined()
                      && queueLength.asInt() == 0
                      && coreThreads.isDefined()
                      && coreThreads.asInt() <= 0) {
                  throw EeLogger.ROOT_LOGGER.invalidCoreThreadsSize(queueLength.asString());
              }
  
              // max-threads must be defined and greater than 0 if core-threads is 0
              if (coreThreads.isDefined()
                      && coreThreads.asInt() == 0
  