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Generic message consumer for event handling in KIT Data Manager 2.0 services

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/*
 * Copyright 2018 Karlsruhe Institute of Technology.
 *
 * 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 edu.kit.datamanager.messaging.client.configuration;

import java.util.ArrayList;
import java.util.List;
import lombok.Data;
import org.springframework.amqp.core.AmqpAdmin;
import org.springframework.amqp.core.Binding;
import org.springframework.amqp.core.BindingBuilder;
import org.springframework.amqp.core.Queue;
import org.springframework.amqp.core.TopicExchange;
import org.springframework.amqp.rabbit.connection.CachingConnectionFactory;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.core.RabbitAdmin;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * RabbitMQ consumer configuration bean. The configuration allows to configure
 * the RabbitMQ server hostname as well as the binding used to connect to a
 * certain exchange. Furthermore, this bean contains all messaging-related
 * beans, e.g. {@link #rabbitTemplate()}, {@link #queue()} and {@link #exchange()
 * }. The configuration is assumed to be located below repo.messaging
 *
 * @author jejkal
 */
@Configuration
@ConfigurationProperties(prefix = "repo.messaging")
@Data
public class RabbitMQConsumerConfiguration{

  /**
   * The hostname of the RabbitMQ server. (default: localhost)
   */
  @Value("${repo.messaging.hostname:localhost}")
  private String hostname;

  /**
   * The consumer binding used to connect to a certain exchange, establishing a
   * queue and linking both by one or more routing keys.
   */
  private ConsumerBinding binding;

  @Bean
  public ConnectionFactory connectionFactory(){
    return new CachingConnectionFactory(hostname);
  }

  @Bean
  public AmqpAdmin amqpAdmin(){
    return new RabbitAdmin(connectionFactory());
  }

  @Bean
  public RabbitTemplate rabbitTemplate(){
    return new RabbitTemplate(connectionFactory());
  }

  @Bean
  public Queue queue(){
    return new Queue(binding.getQueue());
  }

  @Bean
  public TopicExchange exchange(){
    return new TopicExchange(binding.getExchange());
  }

  @Bean
  List bindings(Queue queue, TopicExchange exchange){
    List amqpBindings = new ArrayList<>();

    for(String routingKey : binding.getRoutingKeys()){
      amqpBindings.add(BindingBuilder.bind(queue()).to(exchange()).with(routingKey));
    }

    return amqpBindings;
  }
}