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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.InlineKafkaTopicSink;
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 Reader Topics indexed by topic name.
*/
class IndexedKafkaTopicSinkFactory implements KafkaTopicSinkFactory {
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(IndexedKafkaTopicSinkFactory.class);
/**
* KAFKA Topic Name Index.
*/
protected HashMap<String, KafkaTopicSink> kafkaTopicSinks = new HashMap<>();
@Override
public KafkaTopicSink build(BusTopicParams busTopicParams) {
if (busTopicParams.getServers() == null || busTopicParams.getServers().isEmpty()) {
throw new IllegalArgumentException("KAFKA Server(s) must be provided");
}
if (StringUtils.isBlank(busTopicParams.getTopic())) {
throw new IllegalArgumentException(MISSING_TOPIC);
}
synchronized (this) {
if (kafkaTopicSinks.containsKey(busTopicParams.getTopic())) {
return kafkaTopicSinks.get(busTopicParams.getTopic());
}
KafkaTopicSink kafkaTopicWriter = makeSink(busTopicParams);
if (busTopicParams.isManaged()) {
kafkaTopicSinks.put(busTopicParams.getTopic(), kafkaTopicWriter);
}
return kafkaTopicWriter;
}
}
@Override
public KafkaTopicSink build(List<String> servers, String topic) {
return this.build(BusTopicParams.builder()
.servers(servers)
.topic(topic)
.managed(true)
.useHttps(false)
.build());
}
@Override
public List<KafkaTopicSink> build(Properties properties) {
String writeTopics = properties.getProperty(PolicyEndPointProperties.PROPERTY_KAFKA_SINK_TOPICS);
if (StringUtils.isBlank(writeTopics)) {
logger.info("{}: no topic for KAFKA Sink", this);
return new ArrayList<>();
}
List<KafkaTopicSink> newKafkaTopicSinks = new ArrayList<>();
synchronized (this) {
for (String topic : COMMA_SPACE_PAT.split(writeTopics)) {
addTopic(newKafkaTopicSinks, topic.toLowerCase(), properties);
}
return newKafkaTopicSinks;
}
}
private void addTopic(List<KafkaTopicSink> newKafkaTopicSinks, String topic, Properties properties) {
if (this.kafkaTopicSinks.containsKey(topic)) {
newKafkaTopicSinks.add(this.kafkaTopicSinks.get(topic));
return;
}
String topicPrefix = PolicyEndPointProperties.PROPERTY_KAFKA_SINK_TOPICS + "." + topic;
var props = new PropertyUtils(properties, topicPrefix,
(name, value, ex) -> logger.warn("{}: {} {} is in invalid format for topic sink {} ",
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 sink {}", this, topic);
return;
}
KafkaTopicSink kafkaTopicWriter = this.build(KafkaPropertyUtils.makeBuilder(props, topic, servers)
.partitionId(props.getString(PolicyEndPointProperties.PROPERTY_TOPIC_SINK_PARTITION_KEY_SUFFIX, null))
.build());
newKafkaTopicSinks.add(kafkaTopicWriter);
}
@Override
public void destroy(String topic) {
if (topic == null || topic.isEmpty()) {
throw new IllegalArgumentException(MISSING_TOPIC);
}
KafkaTopicSink kafkaTopicWriter;
synchronized (this) {
if (!kafkaTopicSinks.containsKey(topic)) {
return;
}
kafkaTopicWriter = kafkaTopicSinks.remove(topic);
}
kafkaTopicWriter.shutdown();
}
@Override
public void destroy() {
List<KafkaTopicSink> writers = this.inventory();
for (KafkaTopicSink writer : writers) {
writer.shutdown();
}
synchronized (this) {
this.kafkaTopicSinks.clear();
}
}
@Override
public KafkaTopicSink get(String topic) {
if (topic == null || topic.isEmpty()) {
throw new IllegalArgumentException(MISSING_TOPIC);
}
synchronized (this) {
if (kafkaTopicSinks.containsKey(topic)) {
return kafkaTopicSinks.get(topic);
} else {
throw new IllegalStateException("KafkaTopicSink for " + topic + " not found");
}
}
}
@Override
public synchronized List<KafkaTopicSink> inventory() {
return new ArrayList<>(this.kafkaTopicSinks.values());
}
/**
* Makes a new sink.
*
* @param busTopicParams parameters to use to configure the sink
* @return a new sink
*/
protected KafkaTopicSink makeSink(BusTopicParams busTopicParams) {
return new InlineKafkaTopicSink(busTopicParams);
}
@Override
public String toString() {
return "IndexedKafkaTopicSinkFactory " + kafkaTopicSinks.keySet();
}
}
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