/*
 * Copyright 2013 Red Hat Inc. and/or its affiliates and other contributors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.switchyard.as7.extension.admin;

import static org.switchyard.as7.extension.SwitchYardModelConstants.APPLICATION_NAME;
import static org.switchyard.as7.extension.SwitchYardModelConstants.ENABLED;
import static org.switchyard.as7.extension.SwitchYardModelConstants.MAX_REQUESTS;
import static org.switchyard.as7.extension.SwitchYardModelConstants.SERVICE_NAME;
import static org.switchyard.as7.extension.SwitchYardModelConstants.THROTTLING;

import javax.xml.namespace.QName;

import org.jboss.as.controller.OperationContext;
import org.jboss.as.controller.OperationFailedException;
import org.jboss.as.controller.OperationStepHandler;
import org.jboss.dmr.ModelNode;
import org.jboss.msc.service.ServiceController;
import org.switchyard.admin.Application;
import org.switchyard.admin.Service;
import org.switchyard.admin.SwitchYard;
import org.switchyard.admin.Throttling;
import org.switchyard.as7.extension.services.SwitchYardAdminService;

/**
 * SwitchYardSubsystemStartGateway
 * 
 * Operation for starting a gateway.
 */
public final class SwitchYardSubsystemUpdateThrottling implements OperationStepHandler {

    /**
     * The global instance for this operation.
     */
    public static final SwitchYardSubsystemUpdateThrottling INSTANCE = new SwitchYardSubsystemUpdateThrottling();

    private SwitchYardSubsystemUpdateThrottling() {
        // forbidden inheritance
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.jboss.as.controller.OperationStepHandler#execute(org.jboss.as.controller
     * .OperationContext, org.jboss.dmr.ModelNode)
     */
    @Override
    public void execute(final OperationContext context, final ModelNode operation) throws OperationFailedException {

        context.addStep(new OperationStepHandler() {
            @Override
            public void execute(final OperationContext context, final ModelNode operation)
                    throws OperationFailedException {
                final ServiceController<?> controller = context.getServiceRegistry(false).getRequiredService(
                        SwitchYardAdminService.SERVICE_NAME);
                SwitchYard switchYard = SwitchYard.class.cast(controller.getService().getValue());
                final Application application = switchYard.getApplication(QName.valueOf(operation.get(APPLICATION_NAME)
                        .asString()));
                final QName serviceQName = QName.valueOf(operation.get(SERVICE_NAME).asString());
                final Service service = application.getService(serviceQName);
                try {
                    final Throttling throttling = service.getThrottling();
                    final ModelNode throttlingNode = operation.get(THROTTLING);
                    if (throttlingNode != null) {
                        final ModelNode enabled = throttlingNode.get(ENABLED);
                        final ModelNode maxRequests = throttlingNode.get(MAX_REQUESTS);
                        throttling.update(enabled == null || !enabled.isDefined() ? null : enabled.asBoolean(),
                                maxRequests == null || !maxRequests.isDefined() ? null : maxRequests.asInt());
                    }
                    context.stepCompleted();
                } catch (Throwable e) {
                    throw new OperationFailedException(new ModelNode().set("Error updating throttling: "
                            + e.getMessage()));
                }
            }
        }, OperationContext.Stage.RUNTIME);
        context.stepCompleted();
    }

}