org.springframework.integration.samples.mqtt.Application.java Source code

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Here is the source code for org.springframework.integration.samples.mqtt.Application.java

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/*
 * Copyright 2016-2018 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 org.springframework.integration.samples.mqtt;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.integration.dsl.IntegrationFlow;
import org.springframework.integration.dsl.IntegrationFlows;
import org.springframework.integration.dsl.Pollers;
import org.springframework.integration.endpoint.MessageProducerSupport;
import org.springframework.integration.handler.LoggingHandler;
import org.springframework.integration.mqtt.core.DefaultMqttPahoClientFactory;
import org.springframework.integration.mqtt.core.MqttPahoClientFactory;
import org.springframework.integration.mqtt.inbound.MqttPahoMessageDrivenChannelAdapter;
import org.springframework.integration.mqtt.outbound.MqttPahoMessageHandler;
import org.springframework.integration.mqtt.support.DefaultPahoMessageConverter;
import org.springframework.integration.stream.CharacterStreamReadingMessageSource;
import org.springframework.messaging.MessageHandler;

/**
 * Starts the Spring Context and will initialize the Spring Integration message flow.
 *
 * @author Gary Russell
 *
 */
@SpringBootApplication
public class Application {

    private static final Log LOGGER = LogFactory.getLog(Application.class);

    /**
     * Load the Spring Integration Application Context
     *
     * @param args - command line arguments
     */
    public static void main(final String... args) {

        LOGGER.info("\n========================================================="
                + "\n                                                         "
                + "\n          Welcome to Spring Integration!                 "
                + "\n                                                         "
                + "\n    For more information please visit:                   "
                + "\n    https://spring.io/projects/spring-integration        "
                + "\n                                                         "
                + "\n=========================================================");

        LOGGER.info("\n========================================================="
                + "\n                                                          "
                + "\n    This is the MQTT Sample -                             "
                + "\n                                                          "
                + "\n    Please enter some text and press return. The entered  "
                + "\n    Message will be sent to the configured MQTT topic,    "
                + "\n    then again immediately retrieved from the Message     "
                + "\n    Broker and ultimately printed to the command line.    "
                + "\n                                                          "
                + "\n=========================================================");

        SpringApplication.run(Application.class, args);
    }

    @Bean
    public MqttPahoClientFactory mqttClientFactory() {
        DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
        MqttConnectOptions options = new MqttConnectOptions();
        options.setServerURIs(new String[] { "tcp://localhost:1883" });
        options.setUserName("guest");
        options.setPassword("guest".toCharArray());
        factory.setConnectionOptions(options);
        return factory;
    }

    // publisher

    @Bean
    public IntegrationFlow mqttOutFlow() {
        return IntegrationFlows
                .from(CharacterStreamReadingMessageSource.stdin(), e -> e.poller(Pollers.fixedDelay(1000)))
                .transform(p -> p + " sent to MQTT").handle(mqttOutbound()).get();
    }

    @Bean
    public MessageHandler mqttOutbound() {
        MqttPahoMessageHandler messageHandler = new MqttPahoMessageHandler("siSamplePublisher",
                mqttClientFactory());
        messageHandler.setAsync(true);
        messageHandler.setDefaultTopic("siSampleTopic");
        return messageHandler;
    }

    // consumer

    @Bean
    public IntegrationFlow mqttInFlow() {
        return IntegrationFlows.from(mqttInbound()).transform(p -> p + ", received from MQTT").handle(logger())
                .get();
    }

    private LoggingHandler logger() {
        LoggingHandler loggingHandler = new LoggingHandler("INFO");
        loggingHandler.setLoggerName("siSample");
        return loggingHandler;
    }

    @Bean
    public MessageProducerSupport mqttInbound() {
        MqttPahoMessageDrivenChannelAdapter adapter = new MqttPahoMessageDrivenChannelAdapter("siSampleConsumer",
                mqttClientFactory(), "siSampleTopic");
        adapter.setCompletionTimeout(5000);
        adapter.setConverter(new DefaultPahoMessageConverter());
        adapter.setQos(1);
        return adapter;
    }

}