com.example.SenderApplication.java Source code

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Here is the source code for com.example.SenderApplication.java

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/*
 * Copyright 2017-2018 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
 *
 *      https://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 com.example;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.gcp.pubsub.core.PubSubTemplate;
import org.springframework.cloud.gcp.pubsub.integration.outbound.PubSubMessageHandler;
import org.springframework.context.annotation.Bean;
import org.springframework.integration.annotation.MessagingGateway;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.messaging.MessageHandler;
import org.springframework.util.concurrent.ListenableFutureCallback;

/**
 * Spring Integration Channel Adapters for Google Cloud Pub/Sub code sample.
 *
 * @author Joo Andr Martins
 */
@SpringBootApplication
public class SenderApplication {

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

    public static void main(String[] args) {
        SpringApplication.run(SenderApplication.class, args);
    }

    @Bean
    @ServiceActivator(inputChannel = "pubSubOutputChannel")
    public MessageHandler messageSender(PubSubTemplate pubsubTemplate) {
        PubSubMessageHandler adapter = new PubSubMessageHandler(pubsubTemplate, "exampleTopic");
        adapter.setPublishCallback(new ListenableFutureCallback<String>() {
            @Override
            public void onFailure(Throwable ex) {
                LOGGER.info("There was an error sending the message.");
            }

            @Override
            public void onSuccess(String result) {
                LOGGER.info("Message was sent successfully.");
            }
        });

        return adapter;
    }

    /**
     * interface for sending a message to Pub/Sub.
     */
    @MessagingGateway(defaultRequestChannel = "pubSubOutputChannel")
    public interface PubSubOutboundGateway {

        void sendToPubSub(String text);
    }
}