io.watchcat.node.Watchcat.java Source code

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Here is the source code for io.watchcat.node.Watchcat.java

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/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2014 Thomas Cashman
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package io.watchcat.node;

import io.watchcat.node.util.ShellCommand;

import java.net.InetAddress;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;

import javax.annotation.PreDestroy;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.PropertySource;
import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;

/**
 * Main application entry point
 * 
 * @author Thomas Cashman
 */
@ComponentScan(basePackages = { "io.watchcat" })
@EnableAutoConfiguration
@PropertySource({ "file:/etc/watchcat/node.properties", "file:/etc/watchcat/smtp.properties" })
public class Watchcat {
    private static ScheduledExecutorService scheduledExecutorService;

    public static void main(String[] args) throws Exception {
        SpringApplication.run(Watchcat.class).registerShutdownHook();
    }

    @Bean
    public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {
        return new PropertySourcesPlaceholderConfigurer();
    }

    @Bean
    public static ScheduledExecutorService scheduledExecutorService() {
        if (scheduledExecutorService == null) {
            scheduledExecutorService = Executors.newScheduledThreadPool(Runtime.getRuntime().availableProcessors());
        }
        return scheduledExecutorService;
    }

    @Bean
    public String hostname() {
        ShellCommand getHostname = new ShellCommand("cat /etc/hostname");
        String hostname = getHostname.execute().replace("\n", "");

        if (hostname == null || hostname.length() == 0) {
            try {
                hostname = InetAddress.getLocalHost().getHostName();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return hostname;
    }

    @PreDestroy
    public void preDestroy() {
        scheduledExecutorService.shutdown();
    }
}