io.silverware.microservices.providers.cluster.internal.message.responder.MicroserviceSearchResponder Maven / Gradle / Ivy

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/*
 * -----------------------------------------------------------------------\
 * SilverWare
 *  
 * Copyright (C) 2016 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
 *
 *      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 io.silverware.microservices.providers.cluster.internal.message.responder;

import static io.silverware.microservices.providers.cluster.internal.message.response.MicroserviceSearchResponse.Result.EXCEPTION_THROWN_DURING_LOOKUP;
import static io.silverware.microservices.providers.cluster.internal.message.response.MicroserviceSearchResponse.Result.FOUND;
import static io.silverware.microservices.providers.cluster.internal.message.response.MicroserviceSearchResponse.Result.MULTIPLE_IMPLEMENTATIONS_FOUND;
import static io.silverware.microservices.providers.cluster.internal.message.response.MicroserviceSearchResponse.Result.NOT_FOUND;
import static io.silverware.microservices.providers.cluster.internal.message.response.MicroserviceSearchResponse.Result.WRONG_VERSION;

import io.silverware.microservices.Context;
import io.silverware.microservices.MicroserviceMetaData;
import io.silverware.microservices.providers.cluster.internal.message.response.MicroserviceSearchResponse;
import io.silverware.microservices.silver.cluster.LocalServiceHandle;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.jgroups.Address;

import java.util.List;
import java.util.stream.Collectors;

/**
 * This class is responsible for retrieving correct microservices
 *
 * @author Slavomír Krupa ([email protected])
 */
public class MicroserviceSearchResponder extends AbstractResponder {

   /**
    * Logger.
    */
   protected static Logger log = LogManager.getLogger(MicroserviceSearchResponder.class);

   public MicroserviceSearchResponder(Context context) {
      super(context);
   }

   @Override
   MicroserviceSearchResponse doProcessMessage(Address source, MicroserviceMetaData query) {
      try {
         List localServiceHandles = context.assureLocalHandles(query);
         List serviceHandles = filterVersionCompatible(localServiceHandles, query);

         if (serviceHandles.size() > 1) {
            log.error("Multiple implementations found.", serviceHandles);
            return new MicroserviceSearchResponse(MULTIPLE_IMPLEMENTATIONS_FOUND);
         }
         if (serviceHandles.isEmpty()) {
            log.trace("No services found for metadata: {} ", query);
            return new MicroserviceSearchResponse(localServiceHandles.isEmpty() ? NOT_FOUND : WRONG_VERSION);
         } else {
            log.trace("{} services found for {}", serviceHandles, query);
         }
         return new MicroserviceSearchResponse(serviceHandles.get(0).getHandle(), FOUND);
      } catch (Throwable e) {
         log.error("Exception thrown during service lookup. ", e);
         return new MicroserviceSearchResponse(EXCEPTION_THROWN_DURING_LOOKUP);
      }

   }

   private List filterVersionCompatible(List localServiceHandles, MicroserviceMetaData query) {
      return localServiceHandles.stream().filter(handle -> handle.getMetaData().satisfies(query)).collect(Collectors.toList());
   }

}