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/*-
* ============LICENSE_START=======================================================
* Simulator
* ================================================================================
* Copyright (C) 2021 Nokia. 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.
* ============LICENSE_END=========================================================
*/
package org.onap.avcnmanager;
import org.apache.kafka.streams.KafkaStreams;
import org.apache.kafka.streams.Topology;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.PreDestroy;
import java.time.Duration;
import java.util.Properties;
import java.util.concurrent.locks.ReentrantLock;
@RestController
@EnableScheduling
public class AvcnManagerController {
private static final Logger LOGGER = LoggerFactory.getLogger(AvcnManagerController.class);
private final Topology topology;
private final Properties properties;
private final ReentrantLock lock = new ReentrantLock();
private KafkaStreams kafkaStreams;
public AvcnManagerController(@Qualifier("AVCNTopology") Topology topology,
@Qualifier("AVCNProperties") Properties properties) {
this.topology = topology;
this.properties = properties;
}
@GetMapping("/healthcheck")
public ResponseEntity healthcheck() {
if (kafkaStreams != null && kafkaStreams.state().isRunning()) {
return new ResponseEntity("Up", HttpStatus.OK);
} else {
return new ResponseEntity("Down", HttpStatus.EXPECTATION_FAILED);
}
}
@Scheduled(fixedDelay = 10000)
public void configureKafkaStream() {
try {
lock.lock();
if (kafkaStreams == null) {
startKafkaStream();
} else if (!kafkaStreams.state().isRunning()) {
LOGGER.info("KafkaStream is not running. Trying to restart ...");
kafkaStreams.close(Duration.ZERO);
startKafkaStream();
}
} catch (Exception e) {
LOGGER.info("Unable to configure and start KafkaStream.",e);
this.kafkaStreams = null;
} finally {
lock.unlock();
}
}
private void startKafkaStream() {
LOGGER.info("Starting KafkaStream ...");
kafkaStreams = new KafkaStreams(topology, properties);
kafkaStreams.setUncaughtExceptionHandler(
(thread, throwable) -> System.out.printf(
"Error occurs during data KafkaStream processing. Thread: %s, Throwable: %s%n",
thread, throwable)
);
kafkaStreams.start();
}
@PreDestroy
public void preDestroy() {
try {
lock.lock();
if (kafkaStreams != null) {
kafkaStreams.close(Duration.ZERO);
}
} finally {
lock.unlock();
}
}
}
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