2 * ================================================================================
3 * Copyright (c) 2018 AT&T Intellectual Property. All rights reserved.
4 * ================================================================================
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 * ============LICENSE_END=========================================================
20 package org.onap.dcae.analytics.web.dmaap;
22 import static org.apache.commons.text.StringEscapeUtils.unescapeJava;
23 import static org.apache.commons.text.StringEscapeUtils.unescapeJson;
24 import static org.onap.dcae.analytics.model.AnalyticsHttpConstants.REQUEST_ID_HEADER_KEY;
25 import static org.onap.dcae.analytics.model.AnalyticsModelConstants.ANALYTICS_REQUEST_ID_DELIMITER;
27 import com.fasterxml.jackson.databind.JsonNode;
28 import com.fasterxml.jackson.databind.ObjectMapper;
30 import java.io.IOException;
31 import java.util.Collections;
32 import java.util.LinkedList;
33 import java.util.List;
34 import java.util.stream.IntStream;
36 import javax.annotation.Nonnull;
37 import javax.annotation.Nullable;
39 import org.onap.dcae.analytics.model.DmaapMrConstants;
40 import org.onap.dcae.analytics.web.exception.AnalyticsParsingException;
41 import org.onap.dcae.analytics.web.util.AnalyticsHttpUtils;
42 import org.slf4j.Logger;
43 import org.slf4j.LoggerFactory;
44 import org.springframework.integration.splitter.AbstractMessageSplitter;
45 import org.springframework.integration.support.MessageBuilder;
46 import org.springframework.messaging.Message;
49 * DMaaP MR message splitter split the incoming messages into batch of given batch size
51 * @author Rajiv Singla
53 public class MrMessageSplitter extends AbstractMessageSplitter {
55 private static final Logger logger = LoggerFactory.getLogger(MrMessageSplitter.class);
57 private final ObjectMapper objectMapper;
58 private final Integer batchSize;
60 public MrMessageSplitter(@Nonnull final ObjectMapper objectMapper,
61 @Nonnull final Integer batchSize) {
62 this.objectMapper = objectMapper;
63 this.batchSize = batchSize;
67 protected Object splitMessage(final Message<?> message) {
69 final List<String> dmaapMessages = convertJsonToStringMessages(String.class.cast(message.getPayload()).trim());
71 final String requestId = AnalyticsHttpUtils.getRequestId(message.getHeaders());
72 final String transactionId = AnalyticsHttpUtils.getTransactionId(message.getHeaders());
74 logger.info("Request Id: {}, Transaction Id: {}, Received new messages from DMaaP MR. Count: {}",
75 requestId, transactionId, dmaapMessages.size());
77 final List<List<String>> messagePartitions = partition(dmaapMessages, batchSize);
79 logger.debug("Request Id: {}, Transaction Id: {}, Max allowed messages per batch: {}. " +
80 "No of batches created: {}", requestId, transactionId, batchSize, messagePartitions.size());
82 // append batch id to request id header
83 return messagePartitions.isEmpty() ? null : IntStream.range(0, messagePartitions.size())
84 .mapToObj(batchIndex ->
86 .withPayload(messagePartitions.get(0))
87 .copyHeaders(message.getHeaders())
88 .setHeader(REQUEST_ID_HEADER_KEY,
89 requestId + ANALYTICS_REQUEST_ID_DELIMITER + batchIndex)
96 * Converts DMaaP MR subscriber messages json string to List of messages. If message Json String is empty
99 * @param messagesJsonString json messages String
101 * @return List containing DMaaP MR Messages
103 private List<String> convertJsonToStringMessages(@Nullable final String messagesJsonString) {
105 final LinkedList<String> messages = new LinkedList<>();
107 // If message string is not null or not empty parse json message array to List of string messages
108 if (messagesJsonString != null && !messagesJsonString.trim().isEmpty()
109 && !DmaapMrConstants.SUBSCRIBER_EMPTY_MESSAGE_RESPONSE_STRING.equals(messagesJsonString.trim())) {
113 final JsonNode rootNode = objectMapper.readTree(messagesJsonString);
114 // iterate over root node and parse arrays messages
115 for (JsonNode jsonNode : rootNode) {
116 // if array parse it is array of messages
117 final String incomingMessageString = jsonNode.toString();
118 if (jsonNode.isArray()) {
119 final List messageList = objectMapper.readValue(incomingMessageString, List.class);
120 for (Object message : messageList) {
121 final String jsonMessageString = objectMapper.writeValueAsString(message);
122 addUnescapedJsonToMessage(messages, jsonMessageString);
125 // parse it as object
126 addUnescapedJsonToMessage(messages, incomingMessageString);
130 } catch (IOException e) {
131 final String errorMessage = String.format("Unable to convert subscriber Json String to Messages. " +
132 "Subscriber Response String: %s, Json Error: %s", messagesJsonString, e);
133 logger.error(errorMessage, e);
134 throw new AnalyticsParsingException(errorMessage, e);
142 * Adds unescaped Json messages to given messages list
144 * @param messages message list in which unescaped messages will be added
145 * @param incomingMessageString incoming message string that may need to be escaped
147 private static void addUnescapedJsonToMessage(List<String> messages, String incomingMessageString) {
148 if (incomingMessageString.startsWith("\"") && incomingMessageString.endsWith("\"")) {
149 messages.add(unescapeJava(unescapeJson(
150 incomingMessageString.substring(1, incomingMessageString.length() - 1))));
152 messages.add(unescapeJava(unescapeJson(incomingMessageString)));
157 * Partition list into multiple lists
159 * @param list input list that needs to be broken into chunks
160 * @param batchSize batch size for each list
161 * @param <E> element type of the list
163 * @return List containing list of entries of specified batch size
165 private static <E> List<List<E>> partition(List<E> list, final Integer batchSize) {
167 if (list == null || batchSize == null || batchSize <= 0 || list.size() < batchSize) {
168 return Collections.singletonList(list);
171 final List<List<E>> result = new LinkedList<>();
173 for (int i = 0; i < list.size(); i++) {
175 if (i == 0 || i % batchSize == 0) {
176 List<E> sublist = new LinkedList<>();
180 final List<E> lastSubList = result.get(result.size() - 1);
181 lastSubList.add(list.get(i));