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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.apex.apps.uservice.test.adapt.kafka;
import java.util.Arrays;
import java.util.Properties;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.onap.policy.apex.core.infrastructure.messaging.MessagingException;
import org.onap.policy.apex.core.infrastructure.threading.ThreadUtilities;
/**
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
public class KafkaEventSubscriber implements Runnable {
private final String topic;
private final String kafkaServerAddress;
private long eventsReceivedCount = 0;
KafkaConsumer<String, String> consumer;
Thread subscriberThread;
public KafkaEventSubscriber(final String topic, final String kafkaServerAddress) throws MessagingException {
this.topic = topic;
this.kafkaServerAddress = kafkaServerAddress;
final Properties props = new Properties();
props.put("bootstrap.servers", kafkaServerAddress);
props.put("group.id", "test");
props.put("enable.auto.commit", "true");
props.put("auto.commit.interval.ms", "1000");
props.put("session.timeout.ms", "30000");
props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
consumer = new KafkaConsumer<String, String>(props);
consumer.subscribe(Arrays.asList(topic));
subscriberThread = new Thread(this);
subscriberThread.start();
}
@Override
public void run() {
System.out.println(KafkaEventSubscriber.class.getCanonicalName() + ": receiving events from Kafka server at "
+ kafkaServerAddress + " on topic " + topic);
while (subscriberThread.isAlive() && !subscriberThread.isInterrupted()) {
try {
final ConsumerRecords<String, String> records = consumer.poll(100);
for (final ConsumerRecord<String, String> record : records) {
System.out.println("******");
System.out.println("offset=" + record.offset());
System.out.println("key=" + record.key());
System.out.println("name=" + record.value());
eventsReceivedCount++;
}
} catch (final Exception e) {
// Thread interrupted
break;
}
}
System.out.println(KafkaEventSubscriber.class.getCanonicalName() + ": event reception completed");
}
public long getEventsReceivedCount() {
return eventsReceivedCount;
}
public void shutdown() {
subscriberThread.interrupt();
while (subscriberThread.isAlive()) {
ThreadUtilities.sleep(10);
}
consumer.close();
System.out.println(KafkaEventSubscriber.class.getCanonicalName() + ": stopped");
}
public static void main(final String[] args) throws MessagingException {
if (args.length != 2) {
System.err.println("usage KafkaEventSubscriber topic kafkaServerAddress");
return;
}
new KafkaEventSubscriber(args[0], args[1]);
}
}
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