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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2022-2023 Nordix Foundation.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.common.endpoints.event.comm.bus;
import com.google.re2j.Pattern;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Properties;
import org.apache.commons.lang3.StringUtils;
import org.onap.policy.common.endpoints.event.comm.bus.internal.BusTopicParams;
import org.onap.policy.common.endpoints.event.comm.bus.internal.SingleThreadedKafkaTopicSource;
import org.onap.policy.common.endpoints.properties.PolicyEndPointProperties;
import org.onap.policy.common.endpoints.utils.KafkaPropertyUtils;
import org.onap.policy.common.endpoints.utils.PropertyUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Factory of KAFKA Source Topics indexed by topic name.
*/
class IndexedKafkaTopicSourceFactory implements KafkaTopicSourceFactory {
private static final Pattern COMMA_SPACE_PAT = Pattern.compile("\\s*,\\s*");
private static final String MISSING_TOPIC = "A topic must be provided";
/**
* Logger.
*/
private static final Logger logger = LoggerFactory.getLogger(IndexedKafkaTopicSourceFactory.class);
/**
* KAFKA Topic Name Index.
*/
protected HashMap<String, KafkaTopicSource> kafkaTopicSources = new HashMap<>();
@Override
public KafkaTopicSource build(BusTopicParams busTopicParams) {
if (busTopicParams.getServers() == null || busTopicParams.getServers().isEmpty()) {
throw new IllegalArgumentException("KAFKA Server(s) must be provided");
}
if (busTopicParams.getTopic() == null || busTopicParams.getTopic().isEmpty()) {
throw new IllegalArgumentException(MISSING_TOPIC);
}
synchronized (this) {
if (kafkaTopicSources.containsKey(busTopicParams.getTopic())) {
return kafkaTopicSources.get(busTopicParams.getTopic());
}
var kafkaTopicSource = makeSource(busTopicParams);
kafkaTopicSources.put(busTopicParams.getTopic(), kafkaTopicSource);
return kafkaTopicSource;
}
}
@Override
public List<KafkaTopicSource> build(Properties properties) {
String readTopics = properties.getProperty(PolicyEndPointProperties.PROPERTY_KAFKA_SOURCE_TOPICS);
if (StringUtils.isBlank(readTopics)) {
logger.info("{}: no topic for KAFKA Source", this);
return new ArrayList<>();
}
List<KafkaTopicSource> newKafkaTopicSources = new ArrayList<>();
synchronized (this) {
for (String topic : COMMA_SPACE_PAT.split(readTopics)) {
addTopic(newKafkaTopicSources, topic.toLowerCase(), properties);
}
}
return newKafkaTopicSources;
}
@Override
public KafkaTopicSource build(List<String> servers, String topic) {
return this.build(BusTopicParams.builder()
.servers(servers)
.topic(topic)
.managed(true)
.fetchTimeout(PolicyEndPointProperties.DEFAULT_TIMEOUT_MS_FETCH)
.fetchLimit(PolicyEndPointProperties.DEFAULT_LIMIT_FETCH)
.useHttps(false).build());
}
private void addTopic(List<KafkaTopicSource> newKafkaTopicSources, String topic, Properties properties) {
if (this.kafkaTopicSources.containsKey(topic)) {
newKafkaTopicSources.add(this.kafkaTopicSources.get(topic));
return;
}
String topicPrefix = PolicyEndPointProperties.PROPERTY_KAFKA_SOURCE_TOPICS + "." + topic;
var props = new PropertyUtils(properties, topicPrefix,
(name, value, ex) -> logger.warn("{}: {} {} is in invalid format for topic source {} ",
this, name, value, topic));
String servers = properties.getProperty(topicPrefix + PolicyEndPointProperties.PROPERTY_TOPIC_SERVERS_SUFFIX);
if (StringUtils.isBlank(servers)) {
logger.error("{}: no KAFKA servers configured for source {}", this, topic);
return;
}
var kafkaTopicSource = this.build(KafkaPropertyUtils.makeBuilder(props, topic, servers)
.consumerGroup(props.getString(
PolicyEndPointProperties.PROPERTY_TOPIC_SOURCE_CONSUMER_GROUP_SUFFIX, null))
.consumerInstance(props.getString(
PolicyEndPointProperties.PROPERTY_TOPIC_SOURCE_CONSUMER_INSTANCE_SUFFIX, null))
.fetchTimeout(props.getInteger(
PolicyEndPointProperties.PROPERTY_TOPIC_SOURCE_FETCH_TIMEOUT_SUFFIX,
PolicyEndPointProperties.DEFAULT_TIMEOUT_MS_FETCH))
.fetchLimit(props.getInteger(PolicyEndPointProperties.PROPERTY_TOPIC_SOURCE_FETCH_LIMIT_SUFFIX,
PolicyEndPointProperties.DEFAULT_LIMIT_FETCH))
.build());
newKafkaTopicSources.add(kafkaTopicSource);
}
/**
* Makes a new source.
*
* @param busTopicParams parameters to use to configure the source
* @return a new source
*/
protected KafkaTopicSource makeSource(BusTopicParams busTopicParams) {
return new SingleThreadedKafkaTopicSource(busTopicParams);
}
@Override
public void destroy(String topic) {
if (topic == null || topic.isEmpty()) {
throw new IllegalArgumentException(MISSING_TOPIC);
}
KafkaTopicSource kafkaTopicSource;
synchronized (this) {
if (!kafkaTopicSources.containsKey(topic)) {
return;
}
kafkaTopicSource = kafkaTopicSources.remove(topic);
}
kafkaTopicSource.shutdown();
}
@Override
public void destroy() {
List<KafkaTopicSource> readers = this.inventory();
for (KafkaTopicSource reader : readers) {
reader.shutdown();
}
synchronized (this) {
this.kafkaTopicSources.clear();
}
}
@Override
public KafkaTopicSource get(String topic) {
if (topic == null || topic.isEmpty()) {
throw new IllegalArgumentException(MISSING_TOPIC);
}
synchronized (this) {
if (kafkaTopicSources.containsKey(topic)) {
return kafkaTopicSources.get(topic);
} else {
throw new IllegalStateException("KafkaTopiceSource for " + topic + " not found");
}
}
}
@Override
public synchronized List<KafkaTopicSource> inventory() {
return new ArrayList<>(this.kafkaTopicSources.values());
}
@Override
public String toString() {
return "IndexedKafkaTopicSourceFactory " + kafkaTopicSources.keySet();
}
}
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