gerrit.onap Code Review - policy/common.git/blob

   1 /*
   2  * ============LICENSE_START=======================================================
   3  * Copyright (C) 2022 Nordix Foundation.
   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
   8  *
   9  *      http://www.apache.org/licenses/LICENSE-2.0
  10  *
  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=========================================================
  17  */
  18
  19 package org.onap.policy.common.endpoints.event.comm.bus;
  20
  21 import com.google.re2j.Pattern;
  22 import java.util.ArrayList;
  23 import java.util.HashMap;
  24 import java.util.List;
  25 import java.util.Properties;
  26 import org.apache.commons.lang3.StringUtils;
  27 import org.onap.policy.common.endpoints.event.comm.bus.internal.BusTopicParams;
  28 import org.onap.policy.common.endpoints.event.comm.bus.internal.InlineKafkaTopicSink;
  29 import org.onap.policy.common.endpoints.properties.PolicyEndPointProperties;
  30 import org.onap.policy.common.endpoints.utils.KafkaPropertyUtils;
  31 import org.onap.policy.common.endpoints.utils.PropertyUtils;
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34
  35 /**
  36  * Factory of KAFKA Reader Topics indexed by topic name.
  37  */
  38 class IndexedKafkaTopicSinkFactory implements KafkaTopicSinkFactory {
  39     private static final Pattern COMMA_SPACE_PAT = Pattern.compile("\\s*,\\s*");
  40     private static final String MISSING_TOPIC = "A topic must be provided";
  41
  42     /**
  43      * Logger.
  44      */
  45     private static Logger logger = LoggerFactory.getLogger(IndexedKafkaTopicSinkFactory.class);
  46
  47     /**
  48      * KAFKA Topic Name Index.
  49      */
  50     protected HashMap<String, KafkaTopicSink> kafkaTopicSinks = new HashMap<>();
  51
  52     @Override
  53     public KafkaTopicSink build(BusTopicParams busTopicParams) {
  54
  55         if (busTopicParams.getServers() == null || busTopicParams.getServers().isEmpty()) {
  56             throw new IllegalArgumentException("KAFKA Server(s) must be provided");
  57         }
  58
  59         if (StringUtils.isBlank(busTopicParams.getTopic())) {
  60             throw new IllegalArgumentException(MISSING_TOPIC);
  61         }
  62
  63         synchronized (this) {
  64             if (kafkaTopicSinks.containsKey(busTopicParams.getTopic())) {
  65                 return kafkaTopicSinks.get(busTopicParams.getTopic());
  66             }
  67
  68             KafkaTopicSink kafkaTopicWriter = makeSink(busTopicParams);
  69             if (busTopicParams.isManaged()) {
  70                 kafkaTopicSinks.put(busTopicParams.getTopic(), kafkaTopicWriter);
  71             }
  72
  73             return kafkaTopicWriter;
  74         }
  75     }
  76
  77
  78     @Override
  79     public KafkaTopicSink build(List<String> servers, String topic) {
  80         return this.build(BusTopicParams.builder()
  81                 .servers(servers)
  82                 .topic(topic)
  83                 .managed(true)
  84                 .useHttps(false)
  85                 .build());
  86     }
  87
  88
  89     @Override
  90     public List<KafkaTopicSink> build(Properties properties) {
  91
  92         String writeTopics = properties.getProperty(PolicyEndPointProperties.PROPERTY_KAFKA_SINK_TOPICS);
  93         if (StringUtils.isBlank(writeTopics)) {
  94             logger.info("{}: no topic for KAFKA Sink", this);
  95             return new ArrayList<>();
  96         }
  97
  98         List<KafkaTopicSink> newKafkaTopicSinks = new ArrayList<>();
  99         synchronized (this) {
 100             for (String topic : COMMA_SPACE_PAT.split(writeTopics)) {
 101                 addTopic(newKafkaTopicSinks, topic, properties);
 102             }
 103             return newKafkaTopicSinks;
 104         }
 105     }
 106
 107     private void addTopic(List<KafkaTopicSink> newKafkaTopicSinks, String topic, Properties properties) {
 108         if (this.kafkaTopicSinks.containsKey(topic)) {
 109             newKafkaTopicSinks.add(this.kafkaTopicSinks.get(topic));
 110             return;
 111         }
 112
 113         String topicPrefix = PolicyEndPointProperties.PROPERTY_KAFKA_SINK_TOPICS + "." + topic;
 114
 115         var props = new PropertyUtils(properties, topicPrefix,
 116             (name, value, ex) -> logger.warn("{}: {} {} is in invalid format for topic {} ", this, name, value, topic));
 117
 118         String servers = properties.getProperty(topicPrefix + PolicyEndPointProperties.PROPERTY_TOPIC_SERVERS_SUFFIX);
 119         if (StringUtils.isBlank(servers)) {
 120             logger.error("{}: no KAFKA servers configured for sink {}", this, topic);
 121             return;
 122         }
 123
 124         KafkaTopicSink kafkaTopicWriter = this.build(KafkaPropertyUtils.makeBuilder(props, topic, servers)
 125                 .partitionId(props.getString(PolicyEndPointProperties.PROPERTY_TOPIC_SINK_PARTITION_KEY_SUFFIX, null))
 126                 .build());
 127         newKafkaTopicSinks.add(kafkaTopicWriter);
 128     }
 129
 130     @Override
 131     public void destroy(String topic) {
 132
 133         if (topic == null || topic.isEmpty()) {
 134             throw new IllegalArgumentException(MISSING_TOPIC);
 135         }
 136
 137         KafkaTopicSink kafkaTopicWriter;
 138         synchronized (this) {
 139             if (!kafkaTopicSinks.containsKey(topic)) {
 140                 return;
 141             }
 142
 143             kafkaTopicWriter = kafkaTopicSinks.remove(topic);
 144         }
 145
 146         kafkaTopicWriter.shutdown();
 147     }
 148
 149     @Override
 150     public void destroy() {
 151         List<KafkaTopicSink> writers = this.inventory();
 152         for (KafkaTopicSink writer : writers) {
 153             writer.shutdown();
 154         }
 155
 156         synchronized (this) {
 157             this.kafkaTopicSinks.clear();
 158         }
 159     }
 160
 161     @Override
 162     public KafkaTopicSink get(String topic) {
 163
 164         if (topic == null || topic.isEmpty()) {
 165             throw new IllegalArgumentException(MISSING_TOPIC);
 166         }
 167
 168         synchronized (this) {
 169             if (kafkaTopicSinks.containsKey(topic)) {
 170                 return kafkaTopicSinks.get(topic);
 171             } else {
 172                 throw new IllegalStateException("KafkaTopicSink for " + topic + " not found");
 173             }
 174         }
 175     }
 176
 177     @Override
 178     public synchronized List<KafkaTopicSink> inventory() {
 179         return new ArrayList<>(this.kafkaTopicSinks.values());
 180     }
 181
 182     /**
 183      * Makes a new sink.
 184      *
 185      * @param busTopicParams parameters to use to configure the sink
 186      * @return a new sink
 187      */
 188     protected KafkaTopicSink makeSink(BusTopicParams busTopicParams) {
 189         return new InlineKafkaTopicSink(busTopicParams);
 190     }
 191
 192
 193     @Override
 194     public String toString() {
 195         return "IndexedKafkaTopicSinkFactory " + kafkaTopicSinks.keySet();
 196     }
 197
 198 }