2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2016-2018 Ericsson. All rights reserved.
4 * Modifications Copyright (C) 2019 Nordix Foundation.
5 * ================================================================================
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
18 * SPDX-License-Identifier: Apache-2.0
19 * ============LICENSE_END=========================================================
22 package org.onap.policy.apex.plugins.event.carrier.kafka;
24 import java.time.Duration;
25 import java.util.Arrays;
26 import java.util.Collection;
27 import java.util.Properties;
30 import org.apache.commons.lang3.StringUtils;
31 import org.apache.kafka.clients.producer.internals.DefaultPartitioner;
32 import org.onap.policy.apex.service.parameters.carriertechnology.CarrierTechnologyParameters;
33 import org.onap.policy.common.parameters.GroupValidationResult;
34 import org.onap.policy.common.parameters.ValidationStatus;
35 import org.onap.policy.common.parameters.annotations.Min;
36 import org.onap.policy.common.parameters.annotations.NotBlank;
39 * Apex parameters for Kafka as an event carrier technology.
41 * @author Liam Fallon (liam.fallon@ericsson.com)
45 public class KafkaCarrierTechnologyParameters extends CarrierTechnologyParameters {
47 /** The label of this carrier technology. */
48 public static final String KAFKA_CARRIER_TECHNOLOGY_LABEL = "KAFKA";
50 /** The producer plugin class for the Kafka carrier technology. */
51 public static final String KAFKA_EVENT_PRODUCER_PLUGIN_CLASS = ApexKafkaProducer.class.getName();
53 /** The consumer plugin class for the Kafka carrier technology. */
54 public static final String KAFKA_EVENT_CONSUMER_PLUGIN_CLASS = ApexKafkaConsumer.class.getName();
56 // Repeated strings in messages
57 private static final String ENTRY = "entry ";
58 private static final String KAFKA_PROPERTIES = "kafkaProperties";
60 // Default parameter values
61 private static final String DEFAULT_ACKS = "all";
62 private static final String DEFAULT_BOOT_SERVERS = "localhost:9092";
63 private static final int DEFAULT_RETRIES = 0;
64 private static final int DEFAULT_BATCH_SIZE = 16384;
65 private static final int DEFAULT_LINGER_TIME = 1;
66 private static final long DEFAULT_BUFFER_MEMORY = 33554432;
67 private static final String DEFAULT_GROUP_ID = "default-group-id";
68 private static final boolean DEFAULT_ENABLE_AUTOCMIT = true;
69 private static final int DEFAULT_AUTO_COMMIT_TIME = 1000;
70 private static final int DEFAULT_SESSION_TIMEOUT = 30000;
71 private static final String DEFAULT_PROD_TOPIC = "apex-out";
72 private static final int DEFAULT_CONS_POLL_TIME = 100;
73 private static final String[] DEFAULT_CONS_TOPICLIST = {"apex-in"};
74 private static final String DEFAULT_STRING_SERZER = "org.apache.kafka.common.serialization.StringSerializer";
75 private static final String DEFAULT_STRING_DESZER = "org.apache.kafka.common.serialization.StringDeserializer";
76 private static final String DEFAULT_PARTITIONR_CLASS = DefaultPartitioner.class.getName();
78 // Parameter property map tokens
79 private static final String PROPERTY_BOOTSTRAP_SERVERS = "bootstrap.servers";
80 private static final String PROPERTY_ACKS = "acks";
81 private static final String PROPERTY_RETRIES = "retries";
82 private static final String PROPERTY_BATCH_SIZE = "batch.size";
83 private static final String PROPERTY_LINGER_TIME = "linger.ms";
84 private static final String PROPERTY_BUFFER_MEMORY = "buffer.memory";
85 private static final String PROPERTY_GROUP_ID = "group.id";
86 private static final String PROPERTY_ENABLE_AUTO_COMMIT = "enable.auto.commit";
87 private static final String PROPERTY_AUTO_COMMIT_TIME = "auto.commit.interval.ms";
88 private static final String PROPERTY_SESSION_TIMEOUT = "session.timeout.ms";
89 private static final String PROPERTY_KEY_SERIALIZER = "key.serializer";
90 private static final String PROPERTY_VALUE_SERIALIZER = "value.serializer";
91 private static final String PROPERTY_KEY_DESERIALIZER = "key.deserializer";
92 private static final String PROPERTY_VALUE_DESERIALIZER = "value.deserializer";
93 private static final String PROPERTY_PARTITIONER_CLASS = "partitioner.class";
95 // kafka carrier parameters
97 private String bootstrapServers = DEFAULT_BOOT_SERVERS;
99 private String acks = DEFAULT_ACKS;
101 private int retries = DEFAULT_RETRIES;
103 private int batchSize = DEFAULT_BATCH_SIZE;
105 private int lingerTime = DEFAULT_LINGER_TIME;
107 private long bufferMemory = DEFAULT_BUFFER_MEMORY;
109 private String groupId = DEFAULT_GROUP_ID;
110 private boolean enableAutoCommit = DEFAULT_ENABLE_AUTOCMIT;
112 private int autoCommitTime = DEFAULT_AUTO_COMMIT_TIME;
114 private int sessionTimeout = DEFAULT_SESSION_TIMEOUT;
116 private String producerTopic = DEFAULT_PROD_TOPIC;
118 private int consumerPollTime = DEFAULT_CONS_POLL_TIME;
119 private String[] consumerTopicList = DEFAULT_CONS_TOPICLIST;
121 private String keySerializer = DEFAULT_STRING_SERZER;
123 private String valueSerializer = DEFAULT_STRING_SERZER;
125 private String keyDeserializer = DEFAULT_STRING_DESZER;
127 private String valueDeserializer = DEFAULT_STRING_DESZER;
129 private String partitionerClass = DEFAULT_PARTITIONR_CLASS;
131 // All Kafka properties can be specified as an array of key-value pairs
132 private String[][] kafkaProperties = null;
137 * Constructor to create a kafka carrier technology parameters instance and register the instance with the parameter
140 public KafkaCarrierTechnologyParameters() {
143 // Set the carrier technology properties for the kafka carrier technology
144 this.setLabel(KAFKA_CARRIER_TECHNOLOGY_LABEL);
145 this.setEventProducerPluginClass(KAFKA_EVENT_PRODUCER_PLUGIN_CLASS);
146 this.setEventConsumerPluginClass(KAFKA_EVENT_CONSUMER_PLUGIN_CLASS);
150 * Gets the kafka producer properties.
152 * @return the kafka producer properties
154 public Properties getKafkaProducerProperties() {
155 final Properties retKafkaProps = new Properties();
157 // Add properties from the Kafka property array
158 if (kafkaProperties != null) {
159 for (int i = 0; i < kafkaProperties.length; i++) {
160 retKafkaProps.setProperty(kafkaProperties[i][0], kafkaProperties[i][1]);
165 putExplicitProperty(retKafkaProps, PROPERTY_BOOTSTRAP_SERVERS, bootstrapServers, DEFAULT_BOOT_SERVERS);
166 putExplicitProperty(retKafkaProps, PROPERTY_ACKS, acks, DEFAULT_ACKS);
167 putExplicitProperty(retKafkaProps, PROPERTY_RETRIES, retries, DEFAULT_RETRIES);
168 putExplicitProperty(retKafkaProps, PROPERTY_BATCH_SIZE, batchSize, DEFAULT_BATCH_SIZE);
169 putExplicitProperty(retKafkaProps, PROPERTY_LINGER_TIME, lingerTime, DEFAULT_LINGER_TIME);
170 putExplicitProperty(retKafkaProps, PROPERTY_BUFFER_MEMORY, bufferMemory, DEFAULT_BUFFER_MEMORY);
171 putExplicitProperty(retKafkaProps, PROPERTY_KEY_SERIALIZER, keySerializer, DEFAULT_STRING_SERZER);
172 putExplicitProperty(retKafkaProps, PROPERTY_VALUE_SERIALIZER, valueSerializer, DEFAULT_STRING_SERZER);
173 putExplicitProperty(retKafkaProps, PROPERTY_PARTITIONER_CLASS, partitionerClass, DEFAULT_PARTITIONR_CLASS);
176 return retKafkaProps;
180 * Gets the kafka consumer properties.
182 * @return the kafka consumer properties
184 public Properties getKafkaConsumerProperties() {
185 final Properties retKafkaProps = new Properties();
187 // Add properties from the Kafka property array
188 if (kafkaProperties != null) {
189 for (int i = 0; i < kafkaProperties.length; i++) {
190 retKafkaProps.setProperty(kafkaProperties[i][0], kafkaProperties[i][1]);
195 putExplicitProperty(retKafkaProps, PROPERTY_BOOTSTRAP_SERVERS, bootstrapServers, DEFAULT_BOOT_SERVERS);
196 putExplicitProperty(retKafkaProps, PROPERTY_GROUP_ID, groupId, DEFAULT_GROUP_ID);
197 putExplicitProperty(retKafkaProps, PROPERTY_ENABLE_AUTO_COMMIT, enableAutoCommit, DEFAULT_ENABLE_AUTOCMIT);
198 putExplicitProperty(retKafkaProps, PROPERTY_AUTO_COMMIT_TIME, autoCommitTime, DEFAULT_AUTO_COMMIT_TIME);
199 putExplicitProperty(retKafkaProps, PROPERTY_SESSION_TIMEOUT, sessionTimeout, DEFAULT_SESSION_TIMEOUT);
200 putExplicitProperty(retKafkaProps, PROPERTY_KEY_DESERIALIZER, keyDeserializer, DEFAULT_STRING_DESZER);
201 putExplicitProperty(retKafkaProps, PROPERTY_VALUE_DESERIALIZER, valueDeserializer, DEFAULT_STRING_DESZER);
204 return retKafkaProps;
208 * Gets the consumer topic list.
210 * @return the consumer topic list
212 public Collection<String> getConsumerTopicListAsCollection() {
213 return Arrays.asList(consumerTopicList);
217 * Gets the consumer poll duration.
218 * @return The poll duration
220 public Duration getConsumerPollDuration() {
221 return Duration.ofMillis(consumerPollTime);
228 public GroupValidationResult validate() {
229 final GroupValidationResult result = super.validate();
231 validateConsumerTopicList(result);
233 validateKafkaProperties(result);
239 * Validate the consumer topic list.
241 * @param result the result of the validation.
243 private void validateConsumerTopicList(final GroupValidationResult result) {
244 if (consumerTopicList == null || consumerTopicList.length == 0) {
245 result.setResult("consumerTopicList", ValidationStatus.INVALID,
246 "not specified, must be specified as a list of strings");
250 StringBuilder consumerTopicStringBuilder = new StringBuilder();
251 for (final String consumerTopic : consumerTopicList) {
252 if (StringUtils.isBlank(consumerTopic)) {
253 consumerTopicStringBuilder.append(consumerTopic + "/");
256 if (consumerTopicStringBuilder.length() > 0) {
257 result.setResult("consumerTopicList", ValidationStatus.INVALID,
258 "invalid consumer topic list entries found: /" + consumerTopicStringBuilder.toString());
263 * Validate the kafka properties.
265 * @param result the result of the validation.
267 private void validateKafkaProperties(final GroupValidationResult result) {
268 // Kafka properties are optional
269 if (kafkaProperties == null || kafkaProperties.length == 0) {
273 for (int i = 0; i < kafkaProperties.length; i++) {
274 if (kafkaProperties[i].length != 2) {
275 result.setResult(KAFKA_PROPERTIES, ValidationStatus.INVALID,
276 ENTRY + i + " invalid, kafka properties must be name-value pairs");
279 if (StringUtils.isBlank(kafkaProperties[i][0])) {
280 result.setResult(KAFKA_PROPERTIES, ValidationStatus.INVALID,
281 ENTRY + i + " invalid, key is null or blank");
284 if (StringUtils.isBlank(kafkaProperties[i][1])) {
285 result.setResult(KAFKA_PROPERTIES, ValidationStatus.INVALID,
286 ENTRY + i + " invalid, value is null or blank");
292 * Put a property into the properties if it is not already defined and is not the default value.
294 * @param returnKafkaProperties the properties to set the value in
295 * @param property the property to put
296 * @param value the value of the property to put
297 * @param defaultValue the default value of the property to put
299 private void putExplicitProperty(final Properties returnKafkaProperties, final String property,
300 final Object value, final Object defaultValue) {
302 // Check if the property is already in the properties
303 if (!returnKafkaProperties.containsKey(property)) {
304 // Not found, so add it
305 returnKafkaProperties.setProperty(property, value.toString());
307 // Found, only overwrite if the property does not have the default value
309 returnKafkaProperties.setProperty(property, defaultValue.toString());
310 } else if (!value.toString().contentEquals(defaultValue.toString())) {
311 returnKafkaProperties.setProperty(property, value.toString());