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Common Library of Object and Algorithms for Evento Framework

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package com.evento.common.messaging.gateway;

import com.evento.common.messaging.bus.EventoServer;
import com.evento.common.modeling.messaging.message.application.Message;
import com.evento.common.modeling.messaging.message.application.Metadata;
import com.evento.common.modeling.messaging.message.application.QueryMessage;
import com.evento.common.modeling.messaging.payload.Query;
import com.evento.common.modeling.messaging.query.QueryResponse;
import com.evento.common.modeling.messaging.query.SerializedQueryResponse;

import java.util.concurrent.CompletableFuture;

/**
 * The QueryGatewayImpl class implements the QueryGateway interface
 * and provides a way to send queries and receive the corresponding responses asynchronously.
 */
public class QueryGatewayImpl implements QueryGateway {
	private final EventoServer eventoServer;

	/**
	 * The QueryGatewayImpl class implements the QueryGateway interface
	 * and provides a way to send queries and receive the corresponding responses asynchronously.
     * @param eventoServer an instance of evento server connection
     */
	public QueryGatewayImpl(EventoServer eventoServer) {
		this.eventoServer = eventoServer;
	}

	/**
	 * Queries the system with the given Query object and returns a CompletableFuture representing the response.
	 *
	 * @param query          The Query object to be sent to the system.
	 * @param metadata       The metadata associated with the query.
	 * @param handledMessage The handled message associated with the query.
	 * @param             The type parameter of the QueryResponse expected as the response.
	 * @return A CompletableFuture that resolves to the response of the query.
	 */
	@Override
	@SuppressWarnings("unchecked")
	public > CompletableFuture query(Query query, Metadata metadata,
																   Message handledMessage) {
		try
		{
			var message = new QueryMessage<>((query));
			message.setMetadata(metadata);
			return eventoServer.request(message).thenApply(r -> ((T) ((SerializedQueryResponse) r).getObject()));
		} catch (Exception e)
		{
			var future = new CompletableFuture();
			future.completeExceptionally(e);
			return future;
		}
	}
}