de.hadesrofl.mqtt_client.App.java Source code

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Here is the source code for de.hadesrofl.mqtt_client.App.java

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/**
 * Copyright 2016   Rene Kremer
 *
 * 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.hadesrofl.mqtt_client;

import java.util.ArrayList;
import java.util.List;

import org.json.JSONException;
import org.json.JSONObject;

import de.hadesrofl.database.Database;
import de.hadesrofl.json.JsonReader;

/**
 *
 *
 * <b>Project:</b> mqtt-client
 * <p>
 * <b>Packages:</b> de.hadesrofl.mqtt_client
 * </p>
 * <p>
 * <b>File:</b> App.java
 * </p>
 * <p>
 * <b>last update:</b> 04.11.2016
 * </p>
 * <p>
 * <b>Time:</b> 20:38:00
 * </p>
 * <b>Description:</b>
 * <p>
 * This Class starts a simple Mqtt Connection to a given server and topic and
 * subscribes to that or publishes to it.
 * </p>
 *
 * @author Rene Kremer
 *         <p>
 *         Copyright (c) 2016 by Rene Kremer
 *         </p>
 *         <p>
 *         Licensed under the Apache License, Version 2.0
 *         </p>
 * @version 0.21
 *
 */
public class App {
    public static void main(String[] args) {
        String cf = "";
        if (args.length > 0) {
            cf = args[0];
        } else {
            cf = "config.json";
        }
        JSONObject config = JsonReader.readFile(cf);
        if (config == null)
            System.exit(-1);
        JSONObject broker = config.getJSONObject("broker");
        JSONObject topics = broker.getJSONObject("topics");
        Database db = null;
        try {
            JSONObject database = config.getJSONObject("database");
            db = new Database(database.getString("dbHost"), database.getString("dbPort"),
                    database.getString("dbName"), database.getString("dbUser"), database.getString("dbPass"));
        } catch (JSONException e) {
            System.err.println("No database mentioned in config file");
        }
        List<ClientMqtt> clients = new ArrayList<ClientMqtt>();
        List<Thread> clientThreads = new ArrayList<Thread>();
        for (String topic : topics.keySet()) {
            ClientMqtt client = null;
            if (db == null) {
                client = new ClientMqtt(broker.getString("address"), broker.getInt("port"),
                        topics.getString(topic));
            } else {
                client = new ClientMqtt(broker.getString("address"), broker.getInt("port"), topics.getString(topic),
                        db);
            }
            Thread clientThread = new Thread(client);
            client.setSubscriber(broker.getBoolean("subscribe"));
            clients.add(client);
            clientThreads.add(clientThread);
            clientThread.start();
            // Need to wait a bit as the client needs to connect first
            try {
                Thread.sleep(5000);
            } catch (InterruptedException e) {
                System.err.println("Thread can't sleep, need to take painkillers");
            }
            client.publishMessage("Ground control to Major Tom", 1);
        }
    }
}