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/*
 * Copyright 2012-2015 the original author or authors.
 *
 * 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 net.nicoll.boot.daemon;

import java.io.IOException;

import javax.management.InstanceNotFoundException;
import javax.management.MBeanServerConnection;
import javax.management.remote.JMXConnector;

import org.springframework.boot.SpringApplication;
import org.springframework.util.ClassUtils;

/**
 * Basic daemon implementation for a Spring Boot app.
 *
 * @author Stephane Nicoll
 */
class SpringBootService {

    void start(final String[] args) throws Exception {
        if (args.length == 0) {
            throw new IllegalStateException(
                    "Spring Boot application class must be provided.");
        }
        Class springBootApp = ClassUtils.resolveClassName(args[0],
                SpringBootService.class.getClassLoader());
        System.out.println(
                "Starting Spring Boot application [" + springBootApp.getName()
                        + "]");
        SpringApplication.run(springBootApp);
    }

    void stop(final String[] args) throws IOException {
        System.out.println("Stopping Spring Boot application...");
        int jmxPort = Integer.parseInt(args[0]);
        String jmxName = SpringApplicationAdminClient.DEFAULT_OBJECT_NAME;
        try (JMXConnector connector = SpringApplicationAdminClient.connect(
                jmxPort)) {
            MBeanServerConnection connection
                    = connector.getMBeanServerConnection();
            try {
                new SpringApplicationAdminClient(connection, jmxName).stop();
            } catch (InstanceNotFoundException ex) {
                throw new IllegalStateException(
                        "Spring application lifecycle JMX bean not "
                                + "found, could not stop application "
                                + "gracefully", ex);
            }
        }
    }

}