gerrit.onap Code Review - dcaegen2/services/sdk.git/blob

   1 /*
   2  * ============LICENSE_START====================================
   3  * DCAEGEN2-SERVICES-SDK
   4  * =========================================================
   5  * Copyright (C) 2019 Nokia. All rights reserved.
   6  * =========================================================
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *       http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  * ============LICENSE_END=====================================
  19  */
  20
  21 package org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.impl;
  22
  23 import static org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.impl.Commons.extractFailReason;
  24
  25 import com.google.gson.Gson;
  26 import com.google.gson.JsonArray;
  27 import java.nio.charset.StandardCharsets;
  28 import org.jetbrains.annotations.NotNull;
  29 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpMethod;
  30 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpRequest;
  31 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpResponse;
  32 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.ImmutableHttpRequest;
  33 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.RxHttpClient;
  34 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.api.MessageRouterSubscriber;
  35 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.ImmutableMessageRouterSubscribeResponse;
  36 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterSubscribeRequest;
  37 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterSubscribeResponse;
  38 import org.slf4j.Logger;
  39 import org.slf4j.LoggerFactory;
  40 import reactor.core.publisher.Mono;
  41
  42 /**
  43  * @author <a href="mailto:piotr.jaszczyk@nokia.com">Piotr Jaszczyk</a>
  44  * @since March 2019
  45  */
  46 public class MessageRouterSubscriberImpl implements MessageRouterSubscriber {
  47     private final RxHttpClient httpClient;
  48     private final Gson gson;
  49     private static final Logger LOGGER = LoggerFactory.getLogger(MessageRouterSubscriberImpl.class);
  50
  51     public MessageRouterSubscriberImpl(RxHttpClient httpClient, Gson gson) {
  52         this.httpClient = httpClient;
  53         this.gson = gson;
  54     }
  55
  56     @Override
  57     public Mono<MessageRouterSubscribeResponse> get(MessageRouterSubscribeRequest request) {
  58         LOGGER.debug("Requesting new items from DMaaP MR: {}", request);
  59         return httpClient.call(buildGetHttpRequest(request)).map(this::buildGetResponse);
  60     }
  61
  62
  63     private @NotNull HttpRequest buildGetHttpRequest(MessageRouterSubscribeRequest request) {
  64         return ImmutableHttpRequest.builder()
  65                 .method(HttpMethod.GET)
  66                 .url(buildSubscribeUrl(request))
  67                 .diagnosticContext(request.diagnosticContext().withNewInvocationId())
  68                 .build();
  69     }
  70
  71     private @NotNull MessageRouterSubscribeResponse buildGetResponse(HttpResponse httpResponse) {
  72         final ImmutableMessageRouterSubscribeResponse.Builder builder =
  73                 ImmutableMessageRouterSubscribeResponse.builder();
  74         return httpResponse.successful()
  75                 ? builder.items(httpResponse.bodyAsJson(StandardCharsets.UTF_8, gson, JsonArray.class)).build()
  76                 : builder.failReason(extractFailReason(httpResponse)).build();
  77     }
  78
  79
  80     private String buildSubscribeUrl(MessageRouterSubscribeRequest request) {
  81         return String.format("%s/%s/%s", request.sourceDefinition().topicUrl(), request.consumerGroup(),
  82                 request.consumerId());
  83     }
  84 }