com.expedia.www.haystack.attributor.ManagedApplication.scala Maven / Gradle / Ivy
/*
* Copyright 2020 Expedia Group
*
* 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.
*
*/
package com.expedia.www.haystack.attributor
import com.codahale.metrics.JmxReporter
import com.expedia.www.haystack.attributor.http.ManagedHttpService
import com.expedia.www.haystack.commons.kstreams.app.ManagedService
import com.expedia.www.haystack.commons.logger.LoggerUtils
import org.slf4j.LoggerFactory
import scala.util.Try
/**
* Application lifecycle. Creation and destroy tasks
*
* @param stream Kafka Stream
* @param httpService http service
* @param jmxReporter metrics jmxreporter
*/
class ManagedApplication(stream: ManagedService,
httpService: ManagedHttpService,
jmxReporter: JmxReporter) {
private val LOGGER = LoggerFactory.getLogger(classOf[ManagedApplication])
require(stream != null)
require(jmxReporter != null)
def start(): Unit = {
try {
jmxReporter.start()
LOGGER.info("Starting the given topology and service")
stream.start()
LOGGER.info("kafka stream started successfully")
httpService.start()
LOGGER.info("http service started successfully")
} catch {
case ex: Exception =>
LOGGER.error("Observed fatal exception while starting the app", ex)
stop()
System.exit(1)
}
}
/**
* This method stops the given `StreamsRunner` and `JmxReporter` is they have been
* previously started. If not, this method does nothing
*/
def stop(): Unit = {
LOGGER.info("Shutting down kafka stream")
Try(stream.stop())
LOGGER.info("Shutting down http service")
Try(httpService.close())
LOGGER.info("Shutting down jmxReporter")
Try(jmxReporter.close())
LOGGER.info("Shutting down logger. Bye!")
Try(LoggerUtils.shutdownLogger())
}
}