event-bus/distributed/src/main/java/org/apache/james/events/KeyReconnectionHandler.java

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package org.apache.james.events;

import static org.apache.james.backends.rabbitmq.Constants.AUTO_DELETE;
import static org.apache.james.backends.rabbitmq.Constants.DURABLE;
import static org.apache.james.backends.rabbitmq.Constants.EXCLUSIVE;

import javax.inject.Inject;

import org.apache.james.backends.rabbitmq.RabbitMQConfiguration;
import org.apache.james.backends.rabbitmq.SimpleConnectionPool;
import org.reactivestreams.Publisher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;

import reactor.core.publisher.Mono;

public class KeyReconnectionHandler implements SimpleConnectionPool.ReconnectionHandler {
    private static final Logger LOGGER = LoggerFactory.getLogger(KeyReconnectionHandler.class);

    private final NamingStrategy namingStrategy;
    private final EventBusId eventBusId;
    private final RabbitMQConfiguration configuration;

    @Inject
    public KeyReconnectionHandler(NamingStrategy namingStrategy, EventBusId eventBusId, RabbitMQConfiguration configuration) {
        this.namingStrategy = namingStrategy;
        this.eventBusId = eventBusId;
        this.configuration = configuration;
    }

    @Override
    public Publisher<Void> handleReconnection(Connection connection) {
        return Mono.fromRunnable(() -> {
            try (Channel channel = connection.createChannel()) {
                channel.queueDeclare(namingStrategy.queueName(eventBusId).asString(), DURABLE, !EXCLUSIVE, AUTO_DELETE,
                    configuration.workQueueArgumentsBuilder(AUTO_DELETE).build());
            } catch (Exception e) {
                LOGGER.error("Error recovering connection", e);
            }
        });
    }
}