/*
 * 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.server.operations;


import org.jboss.as.controller.OperationContext;
import org.jboss.as.controller.OperationDefinition;
import org.jboss.as.controller.OperationFailedException;
import org.jboss.as.controller.OperationStepHandler;
import org.jboss.as.controller.SimpleOperationDefinition;
import org.jboss.as.controller.SimpleOperationDefinitionBuilder;
import org.jboss.as.controller.descriptions.ModelDescriptionConstants;
import org.jboss.as.controller.registry.OperationEntry;
import org.jboss.as.server.controller.descriptions.ServerDescriptions;
import org.jboss.as.server.suspend.SuspendController;
import org.jboss.dmr.ModelNode;
import org.jboss.msc.service.ServiceController;
import org.jboss.msc.service.ServiceRegistry;

/**
 * Handler that suspends server operations
 *
 * @author Stuart Douglas
 */
public class ServerResumeHandler implements OperationStepHandler {
    protected static final String OPERATION_NAME = ModelDescriptionConstants.RESUME;

    public static final ServerResumeHandler INSTANCE = new ServerResumeHandler();

    public static final SimpleOperationDefinition DEFINITION = new SimpleOperationDefinitionBuilder(ModelDescriptionConstants.RESUME, ServerDescriptions.getResourceDescriptionResolver())
            .setRuntimeOnly()
            .build();

    public static final OperationDefinition DOMAIN_DEFINITION = new SimpleOperationDefinitionBuilder(OPERATION_NAME, ServerDescriptions.getResourceDescriptionResolver())
            .setPrivateEntry() // For now
            .withFlags(OperationEntry.Flag.HOST_CONTROLLER_ONLY, OperationEntry.Flag.RUNTIME_ONLY)
            .build();

    /**
     * {@inheritDoc}
     */
    @Override
    public void execute(OperationContext context, ModelNode operation) throws OperationFailedException {
        // Acquire the controller lock to prevent new write ops and wait until current ones are done
        context.acquireControllerLock();
        context.addStep(new OperationStepHandler() {
            @Override
            public void execute(OperationContext context, ModelNode operation) throws OperationFailedException {
                // Even though we don't read from the service registry, we have a reference to a
                // service-fronted 'processState' so tell the controller we are modifying a service
                final ServiceRegistry registry = context.getServiceRegistry(true);
                context.completeStep(new OperationContext.ResultHandler() {
                    @Override
                    public void handleResult(OperationContext.ResultAction resultAction, OperationContext context, ModelNode operation) {
                        if(resultAction == OperationContext.ResultAction.KEEP) {
                            //even if the timeout is zero we still pause the server
                            //to stop new requests being accepted as it is shutting down
                            ServiceController<SuspendController> shutdownController = (ServiceController<SuspendController>) registry.getRequiredService(SuspendController.SERVICE_NAME);
                            shutdownController.getValue().resume();
                        }
                    }
                });
            }
        }, OperationContext.Stage.RUNTIME);
    }
}