gt:     protected boolean requiresRuntime(OperationContext context) {
context: /*
   * JBoss, Home of Professional Open Source.
   * Copyright 2011, 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.controller;
  
  import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.NAME;
  import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.VALUE;
  import static org.jboss.as.controller.logging.ControllerLogger.MGMT_OP_LOGGER;
  
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.Map;
  
  import org.jboss.as.controller.descriptions.ModelDescriptionConstants;
  import org.jboss.as.controller.operations.validation.ParametersValidator;
  import org.jboss.as.controller.registry.AttributeAccess;
  import org.jboss.as.controller.registry.Resource;
  import org.jboss.dmr.ModelNode;
  import org.wildfly.common.Assert;
  
  /**
   * Abstract handler for the write aspect of a
   * {@link org.jboss.as.controller.registry.ManagementResourceRegistration#registerReadWriteAttribute(AttributeDefinition, OperationStepHandler, OperationStepHandler) read-write attribute}.
   *
   * @param <T> the type of an object that, if stored by the
   * {@link AbstractWriteAttributeHandler#applyUpdateToRuntime(OperationContext, ModelNode, String, ModelNode, ModelNode, HandbackHolder)}
   * implementation, will be passed to
   * {@link AbstractWriteAttributeHandler#revertUpdateToRuntime(OperationContext, ModelNode, String, ModelNode, ModelNode, Object)}.
   *
   * @author Brian Stansberry (c) 2011 Red Hat Inc.
   */
  public abstract class AbstractWriteAttributeHandler<T> implements OperationStepHandler {
  
      private final ParametersValidator nameValidator = new ParametersValidator();
  
      private final Map<String, AttributeDefinition> attributeDefinitions;
  
      protected AbstractWriteAttributeHandler(final AttributeDefinition... definitions) {
          Assert.assertNotNull(definitions);
          attributeDefinitions = new HashMap<String, AttributeDefinition>();
          for (AttributeDefinition def : definitions) {
              attributeDefinitions.put(def.getName(), def);
          }
  
      }
  
      protected AbstractWriteAttributeHandler(final Collection<AttributeDefinition> definitions) {
          this(definitions.toArray(new AttributeDefinition[definitions.size()]));
      }
  
      @Override
      public void execute(OperationContext context, ModelNode operation) throws OperationFailedException {
  
          nameValidator.validate(operation);
          final String attributeName = operation.require(NAME).asString();
          // Don't require VALUE. Let the validator decide if it's bothered by an undefined value
          ModelNode newValue = operation.hasDefined(VALUE) ? operation.get(VALUE) : new ModelNode();
          final Resource resource = context.readResourceForUpdate(PathAddress.EMPTY_ADDRESS);
          final ModelNode submodel = resource.getModel();
          final ModelNode currentValue = submodel.get(attributeName).clone();
  
          final AttributeDefinition attributeDefinition = getAttributeDefinition(attributeName);
          final ModelNode defaultValue;
          if (attributeDefinition != null) {
              defaultValue = attributeDefinition.getDefaultValue();
              final ModelNode syntheticOp = new ModelNode();
              syntheticOp.get(attributeName).set(newValue);
              attributeDefinition.validateAndSet(syntheticOp, submodel);
              newValue = submodel.get(attributeName);
              recordCapabilitiesAndRequirements(context, attributeDefinition, newValue, currentValue);
          } else {
              defaultValue = null;
              submodel.get(attributeName).set(newValue);
          }
  
          finishModelStage(context, operation, attributeName, newValue, currentValue, resource);
  
          if (requiresRuntime(context)) {
              final ModelNode updatedValue = newValue;
              context.addStep(operation, new OperationStepHandler() {
                  @Override
                  public void execute(OperationContext context, ModelNode operation) throws OperationFailedException {
                      final ModelNode resolvedValue = attributeDefinition != null ? attributeDefinition.resolveModelAttribute(context, submodel) : context.resolveExpressions(updatedValue);
                      final HandbackHolder<T> handback = new HandbackHolder<T>();
                      final boolean reloadRequired = applyUpdateToRuntime(context, operation, attributeName, resolvedValue, currentValue, handback);
                      if (reloadRequired) {
                          if (attributeDefinition != null && attributeDefinition.getImmutableFlags().contains(AttributeAccess.Flag.RESTART_JVM)){
                              context.restartRequired();
                          }else{
                              context.reloadRequired();
                          }
                      }
  
                      context.completeStep(new OperationContext.RollbackHandler() {
                          @Override
                          public void handleRollback(OperationContext context, ModelNode operation) {
                              try {
                                  ModelNode valueToRestore = context.resolveExpressions(currentValue);
                                  if (valueToRestore.isDefined() == false && defaultValue != null) {
                                      valueToRestore = defaultValue;
                                  }
                                  revertUpdateToRuntime(context, operation, attributeName, valueToRestore, resolvedValue, handback.handback);
                              } catch (Exception e) {
                                  MGMT_OP_LOGGER.errorRevertingOperation(e, getClass().getSimpleName(),
                                          operation.require(ModelDescriptionConstants.OP).asString(),
                                          context.getCurrentAddress());
                              }
                              if (reloadRequired) {
                                  if (attributeDefinition != null && attributeDefinition.getImmutableFlags().contains(AttributeAccess.Flag.RESTART_JVM)) {
                                      context.revertRestartRequired();
                                  } else {
                                      context.revertReloadRequired();
                                  }
  
                              }
                          }
                      });
                  }
              }, OperationContext.Stage.RUNTIME);
          }
      }
  
  
      /**
       * Hook to allow subclasses to make runtime changes to effect the attribute value change.
       *
       * @param context the context of the operation
       * @param operation the operation
       * @param attributeName the name of the attribute being modified
       * @param resolvedValue the new value for the attribute, after any {@link org.jboss.dmr.ValueExpression} has been resolved
       * @param currentValue the existing value for the attribute
       * @param handbackHolder holder for an arbitrary object to pass to
       *             {@link #revertUpdateToRuntime(OperationContext, ModelNode, String, ModelNode, ModelNode, Object)} if
       *             the operation needs to be rolled back
       *
       * @return {@code true} if the server requires reload to effect the attribute
       *         value change; {@code false} if not
       */
      protected abstract boolean applyUpdateToRuntime(OperationContext context, ModelNode operation, String attributeName,
                                                      ModelNode resolvedValue, ModelNode currentValue, HandbackHolder<T> handbackHolder)
              throws OperationFailedException;
  
      /**
       * Hook to allow subclasses to revert runtime changes made in
       * {@link #applyUpdateToRuntime(OperationContext, ModelNode, String, ModelNode, ModelNode, HandbackHolder)}.
       *
       * @param context the context of the operation
       * @param operation the operation
       * @param attributeName the name of the attribute being modified
       * @param valueToRestore the previous value for the attribute, before this operation was executed
       * @param valueToRevert the new value for the attribute that should be reverted
       * @param handback an object, if any, passed in to the {@code handbackHolder} by the {@code applyUpdateToRuntime}
       *                 implementation
       */
      protected abstract void revertUpdateToRuntime(OperationContext context, ModelNode operation, String attributeName,
                                                    ModelNode valueToRestore, ModelNode valueToRevert, T handback)
              throws OperationFailedException;
  
      /**
       * Record any new requirements for other {@link org.jboss.as.controller.capability.RuntimeCapability capabilities}
       * that now exist as a result of this operation, or remove any existing requirements that no longer exist.
       *
       * @param context the context. Will not be {@code null}
       * @param attributeDefinition the definition of the attribute being modified. Will not be {@code null}
       * @param newValue the new value of the attribute
       * @param oldValue the previous value of the attribute
       */
      protected void recordCapabilitiesAndRequirements(OperationContext context, AttributeDefinition attributeDefinition,
                                                       ModelNode newValue, ModelNode oldValue) {
          Resource resource = context.readResource(PathAddress.EMPTY_ADDRESS);
          attributeDefinition.removeCapabilityRequirements(context, resource, oldValue);
          attributeDefinition.addCapabilityRequirements(context, resource, newValue);
      }
  
      /**
       * Hook to allow subclasses to do any final {@link OperationContext.Stage#MODEL} processing following the
       * application of the new attribute value. This default implementation calls
       * {@link #validateUpdatedModel(OperationContext, Resource)}.
       * <p>
       * <strong>NOTE:</strong> Implementations must not call
       * {@link OperationContext#completeStep(OperationContext.ResultHandler)} or any of its variants. The method that
       * calls this one handles step completion.
       * </p>
       *
       *
       * @param context the operation context
       * @param operation the operation
       * @param attributeName the name of the attribute being modified
       * @param newValue the new value for the attribute
       * @param oldValue the previous value for the attribute
       * @param model the updated model resource
       * @throws OperationFailedException
       */
      protected void finishModelStage(final OperationContext context, final ModelNode operation, String attributeName,
                                      ModelNode newValue, ModelNode oldValue, final Resource model) throws OperationFailedException {
          validateUpdatedModel(context, model);
      }
  
      /**
       * Hook to allow subclasses to validate the model following the application of the new attribute value.
       * This default implementation does nothing.
       *
       * @param context the operation context
       * @param model the updated model resource
       * @throws OperationFailedException
       */
      protected void validateUpdatedModel(final OperationContext context, final Resource model) throws OperationFailedException {
          // default impl does nothing
      }
  
  
      /**
       * Gets whether a {@link OperationContext.Stage#RUNTIME} handler should be added. This default implementation
       * returns true if the process is a {@link OperationContext#isNormalServer() normal server} and the process
       * is not {@link OperationContext#isBooting() booting}. The rationale for the latter check is if the process is
       * booting, the resource being modified will have been added as a previous step in the same context, and
       * the Stage.RUNTIME handling for that add will see a model the reflects the changes made by this handler and
       * will apply them to the runtime.
       *
       * @param context operation context
       * @return {@code true} if a runtime stage handler should be added; {@code false} otherwise.
       */
  