2 * ========================LICENSE_START=================================
5 * Copyright (C) 2020 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.oransc.policyagent.dmaap;
23 import com.google.common.collect.Iterables;
24 import com.google.gson.JsonArray;
25 import com.google.gson.JsonElement;
26 import com.google.gson.JsonParser;
28 import java.time.Duration;
29 import java.util.ArrayList;
30 import java.util.List;
32 import org.oransc.policyagent.clients.AsyncRestClient;
33 import org.oransc.policyagent.configuration.ApplicationConfig;
34 import org.oransc.policyagent.exceptions.ServiceException;
35 import org.slf4j.Logger;
36 import org.slf4j.LoggerFactory;
37 import org.springframework.beans.factory.annotation.Autowired;
38 import org.springframework.beans.factory.annotation.Value;
39 import org.springframework.http.ResponseEntity;
40 import org.springframework.stereotype.Component;
43 * The class fetches incoming requests from DMAAP. It uses the timeout parameter
44 * that lets the MessageRouter keep the connection with the Kafka open until
45 * requests are sent in.
48 * this service will regularly check the configuration and start polling DMaaP
49 * if the configuration is added. If the DMaaP configuration is removed, then
50 * the service will stop polling and resume checking for configuration.
53 * Each received request is processed by {@link DmaapMessageHandler}.
56 public class DmaapMessageConsumer {
58 protected static final Duration TIME_BETWEEN_DMAAP_RETRIES = Duration.ofSeconds(10);
60 private static final Logger logger = LoggerFactory.getLogger(DmaapMessageConsumer.class);
62 private final ApplicationConfig applicationConfig;
64 private DmaapMessageHandler dmaapMessageHandler = null;
66 @Value("${server.http-port}")
67 private int localServerHttpPort;
70 public DmaapMessageConsumer(ApplicationConfig applicationConfig) {
71 this.applicationConfig = applicationConfig;
75 * Starts the consumer. If there is a DMaaP configuration, it will start polling
76 * for messages. Otherwise it will check regularly for the configuration.
78 * @return the running thread, for test purposes.
80 public Thread start() {
81 Thread thread = new Thread(this::messageHandlingLoop);
86 private void messageHandlingLoop() {
87 while (!isStopped()) {
89 if (isDmaapConfigured()) {
90 Iterable<String> dmaapMsgs = fetchAllMessages();
91 if (dmaapMsgs != null && Iterables.size(dmaapMsgs) > 0) {
92 logger.debug("Fetched all the messages from DMAAP and will start to process the messages");
93 for (String msg : dmaapMsgs) {
98 sleep(TIME_BETWEEN_DMAAP_RETRIES); // wait for configuration
100 } catch (Exception e) {
101 logger.warn("{}", e.getMessage());
102 sleep(TIME_BETWEEN_DMAAP_RETRIES);
107 protected boolean isStopped() {
111 protected boolean isDmaapConfigured() {
112 String producerTopicUrl = applicationConfig.getDmaapProducerTopicUrl();
113 String consumerTopicUrl = applicationConfig.getDmaapConsumerTopicUrl();
114 return (!producerTopicUrl.isEmpty() && !consumerTopicUrl.isEmpty());
117 private static List<String> parseMessages(String jsonString) {
118 JsonArray arrayOfMessages = JsonParser.parseString(jsonString).getAsJsonArray();
119 List<String> result = new ArrayList<>();
120 for (JsonElement element : arrayOfMessages) {
121 if (element.isJsonPrimitive()) {
122 result.add(element.getAsString());
124 String messageAsString = element.toString();
125 result.add(messageAsString);
131 protected Iterable<String> fetchAllMessages() throws ServiceException {
132 String topicUrl = this.applicationConfig.getDmaapConsumerTopicUrl();
133 AsyncRestClient consumer = getMessageRouterConsumer();
134 ResponseEntity<String> response = consumer.getForEntity(topicUrl).block();
135 logger.debug("DMaaP consumer received {} : {}", response.getStatusCode(), response.getBody());
136 if (response.getStatusCode().is2xxSuccessful()) {
137 return parseMessages(response.getBody());
139 throw new ServiceException("Cannot fetch because of Error respons: " + response.getStatusCode().toString()
140 + " " + response.getBody());
144 private void processMsg(String msg) {
145 logger.debug("Message Reveived from DMAAP : {}", msg);
146 getDmaapMessageHandler().handleDmaapMsg(msg);
149 protected DmaapMessageHandler getDmaapMessageHandler() {
150 if (this.dmaapMessageHandler == null) {
151 String agentBaseUrl = "http://localhost:" + this.localServerHttpPort;
152 AsyncRestClient agentClient = new AsyncRestClient(agentBaseUrl);
153 AsyncRestClient producer = new AsyncRestClient(this.applicationConfig.getDmaapProducerTopicUrl(),
154 this.applicationConfig.getWebClientConfig());
155 this.dmaapMessageHandler = new DmaapMessageHandler(producer, agentClient);
157 return this.dmaapMessageHandler;
160 protected void sleep(Duration duration) {
162 Thread.sleep(duration.toMillis());
163 } catch (Exception e) {
164 logger.error("Failed to put the thread to sleep", e);
168 protected AsyncRestClient getMessageRouterConsumer() {
169 return new AsyncRestClient("", this.applicationConfig.getWebClientConfig());