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A simple library for building REST API using Vertx.

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package ph.com.nightowlstudios.service;

import io.netty.handler.codec.http.HttpResponseStatus;
import io.vertx.core.AbstractVerticle;
import io.vertx.core.Future;
import io.vertx.core.Vertx;
import io.vertx.core.json.JsonObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.Method;
import java.util.IllegalFormatException;
import java.util.NoSuchElementException;

/**
 * @author Joseph Harvey Angeles - yev
 * @since 4/4/21
 **/
public abstract class Service extends AbstractVerticle {

  protected final Logger log;

  public Service() {
    this.log = LoggerFactory.getLogger(this.getClass());
  }

  @SuppressWarnings("unchecked")
  @Override
  public void start() throws Exception {
    setup(vertx);
    vertx.eventBus()
      .consumer(this.getClass().getName())
      .handler(message -> {
        String action = message.headers().get("action");
        try {
          JsonObject body = message.body();
          Method method = this.getClass().getMethod(action, ServiceUtils.extractRequestPayloadParameterTypes(body));
          Future response = (Future) method.invoke(this, ServiceUtils.extractRequestPayloadParameters(body));
          response.onSuccess(payload -> {
            // Payload can be null, EdgeService will reply with an Optional.empty()
            if (payload == null || !payload.getClass().getName().equals(Void.class.getName())) {
              message.reply(ServiceUtils.buildReplyPayload(payload));
            }
          }).onFailure(failure -> message.fail(getFailureCode(failure), failure.getMessage()));
        } catch (NoSuchElementException | NullPointerException npe) {
          message.fail(HttpResponseStatus.NOT_FOUND.code(), npe.getMessage());
        } catch (IllegalAccessException | IllegalArgumentException ie) {
          message.fail(HttpResponseStatus.UNAUTHORIZED.code(), ie.getMessage());
        } catch (Exception e) {
          log.error(String.format("Error encountered upon handling of %s action on %s service.", action, this.getClass().getName()), e.getCause());
          message.fail(HttpResponseStatus.INTERNAL_SERVER_ERROR.code(), e.getMessage());
        }
      });
    super.start();
  }

  private int getFailureCode(Throwable failure) {
    if (failure instanceof NoSuchElementException || failure instanceof NullPointerException) {
      return HttpResponseStatus.NOT_FOUND.code();
    } else if (failure instanceof IllegalAccessException || failure instanceof IllegalFormatException) {
      return HttpResponseStatus.FORBIDDEN.code();
    } else {
      return HttpResponseStatus.INTERNAL_SERVER_ERROR.code();
    }
  }

  /**
   * Initialize Vert.x-dependent dependencies here. ie: {@link ph.com.nightowlstudios.persistence.PersistenceClient}
   *
   * @param vertx Reference to the Vert.x instance that deployed this verticle.
   */
  protected abstract void setup(Vertx vertx);

}
    

    

    

            

    

            



    
    






    
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