de.codecentric.boot.admin.services.SpringBootAdminRegistratorTask.java Source code

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Here is the source code for de.codecentric.boot.admin.services.SpringBootAdminRegistratorTask.java

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/*
 * Copyright 2014 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 de.codecentric.boot.admin.services;

import java.net.InetAddress;
import java.net.URL;
import java.util.ArrayList;

import javax.annotation.PostConstruct;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.util.Assert;
import org.springframework.web.client.RestTemplate;

import de.codecentric.boot.admin.model.Application;

/**
 * Scheduler that checks the registration of the application at the spring-boot-admin.
 */
public class SpringBootAdminRegistratorTask implements Runnable {

    private static final Logger LOGGER = LoggerFactory.getLogger(SpringBootAdminRegistratorTask.class);

    @Autowired
    private Environment env;

    @PostConstruct
    public void check() {
        Assert.notNull(env.getProperty("spring.boot.admin.url"),
                "The URL of the spring-boot-admin application is mandatory");
        Assert.notNull(env.getProperty("server.port"), "The server port of the application is mandatory");
        Assert.notNull(env.getProperty("info.id"), "The id of the application is mandatory");
    }

    /**
     * @see java.lang.Runnable#run()
     */
    @Override
    public void run() {
        try {
            String id = env.getProperty("info.id");
            int port = env.getProperty("server.port", Integer.class);
            String adminUrl = env.getProperty("spring.boot.admin.url");
            RestTemplate template = new RestTemplate();
            template.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
            ApplicationList list = template.getForObject(adminUrl + "/api/applications", ApplicationList.class);
            for (Application app : list) {
                if (id.equals(app.getId())) {
                    // the application is already registered at the admin tool
                    LOGGER.debug("Application already registered with ID '{}'", id);
                    return;
                }
            }
            // register the application with the used URL and port
            String url = new URL("http", InetAddress.getLocalHost().getCanonicalHostName(), port, "").toString();
            Application app = new Application();
            app.setId(id);
            app.setUrl(url);
            template.postForObject(adminUrl + "/api/applications", app, String.class);
            LOGGER.info("Application registered itself at the admin application with ID '{}' and URL '{}'", id,
                    url);
        } catch (Exception e) {
            LOGGER.warn("Failed to register application at spring-boot-admin, message={}", e.getMessage());
        }
    }

    private static class ApplicationList extends ArrayList<Application> {
        private static final long serialVersionUID = 1L;
    }

}