2 * ========================LICENSE_START=================================
5 * Copyright (C) 2021 Nordix Foundation
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
11 * http://www.apache.org/licenses/LICENSE-2.0
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===================================
21 package org.oran.dmaapadapter.tasks;
23 import java.time.Duration;
25 import org.oran.dmaapadapter.clients.AsyncRestClient;
26 import org.oran.dmaapadapter.clients.AsyncRestClientFactory;
27 import org.oran.dmaapadapter.configuration.ApplicationConfig;
28 import org.oran.dmaapadapter.repository.InfoType;
29 import org.oran.dmaapadapter.repository.Jobs;
30 import org.slf4j.Logger;
31 import org.slf4j.LoggerFactory;
33 import reactor.core.publisher.Flux;
34 import reactor.core.publisher.FluxSink;
35 import reactor.core.publisher.Mono;
38 * The class fetches incoming requests from DMAAP and sends them further to the
39 * consumers that has a job for this InformationType.
42 public class DmaapTopicConsumer {
43 private static final Duration TIME_BETWEEN_DMAAP_RETRIES = Duration.ofSeconds(10);
44 private static final Logger logger = LoggerFactory.getLogger(DmaapTopicConsumer.class);
46 private final AsyncRestClient dmaapRestClient;
47 private final InfiniteFlux infiniteSubmitter = new InfiniteFlux();
48 protected final ApplicationConfig applicationConfig;
49 protected final InfoType type;
50 protected final Jobs jobs;
52 /** Submits new elements until stopped */
53 private static class InfiniteFlux {
54 private FluxSink<Integer> sink;
55 private int counter = 0;
57 public synchronized Flux<Integer> start() {
59 return Flux.create(this::next).doOnRequest(this::onRequest);
62 public synchronized void stop() {
63 if (this.sink != null) {
69 void onRequest(long no) {
70 logger.debug("InfiniteFlux.onRequest {}", no);
71 for (long i = 0; i < no; ++i) {
76 void next(FluxSink<Integer> sink) {
77 logger.debug("InfiniteFlux.next");
83 public DmaapTopicConsumer(ApplicationConfig applicationConfig, InfoType type, Jobs jobs) {
84 AsyncRestClientFactory restclientFactory = new AsyncRestClientFactory(applicationConfig.getWebClientConfig());
85 this.dmaapRestClient = restclientFactory.createRestClientNoHttpProxy("");
86 this.applicationConfig = applicationConfig;
92 infiniteSubmitter.start() //
93 .flatMap(notUsed -> getFromMessageRouter(getDmaapUrl()), 1) //
94 .flatMap(this::pushDataToConsumers) //
97 throwable -> logger.error("DmaapMessageConsumer error: {}", throwable.getMessage()), //
98 () -> logger.warn("DmaapMessageConsumer stopped {}", type.getId())); //
102 private String getDmaapUrl() {
103 return this.applicationConfig.getDmaapBaseUrl() + type.getDmaapTopicUrl();
106 private Mono<String> handleDmaapErrorResponse(Throwable t) {
107 logger.debug("error from DMAAP {} {}", t.getMessage(), type.getDmaapTopicUrl());
108 return Mono.delay(TIME_BETWEEN_DMAAP_RETRIES) //
109 .flatMap(notUsed -> Mono.empty());
112 private Mono<String> getFromMessageRouter(String topicUrl) {
113 logger.trace("getFromMessageRouter {}", topicUrl);
114 return dmaapRestClient.get(topicUrl) //
115 .filter(body -> body.length() > 3) // DMAAP will return "[]" sometimes. That is thrown away.
116 .doOnNext(message -> logger.debug("Message from DMAAP topic: {} : {}", topicUrl, message)) //
117 .onErrorResume(this::handleDmaapErrorResponse); //
120 private Mono<String> handleConsumerErrorResponse(Throwable t) {
121 logger.warn("error from CONSUMER {}", t.getMessage());
125 protected Flux<String> pushDataToConsumers(String body) {
126 logger.debug("Received data {}", body);
127 final int CONCURRENCY = 50;
129 // Distibute the body to all jobs for this type
130 return Flux.fromIterable(this.jobs.getJobsForType(this.type)) //
131 .doOnNext(job -> logger.debug("Sending to consumer {}", job.getCallbackUrl())) //
132 .flatMap(job -> job.getConsumerRestClient().post("", body), CONCURRENCY) //
133 .onErrorResume(this::handleConsumerErrorResponse);