Service.kt

/*
 * search-doc-service
 * Copyright (C) 2020 Memoriav
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

package org.memobase

import ch.memobase.settings.SettingsLoader
import kotlin.system.exitProcess
import org.apache.kafka.streams.KafkaStreams
import org.apache.logging.log4j.LogManager
import org.memobase.helpers.KEYS

class Service(file: String = "app.yml") {
    companion object {
        const val name = "search-doc-service"
    }
    private val log = LogManager.getLogger("SearchDocService")

    val settings = SettingsLoader(
            listOf(
                    KEYS.SettingsProps.institutionTypeLabelsPath,
                    KEYS.SettingsProps.documentTypeLabelsPath,
                    KEYS.SettingsProps.mediaUrl,
                    KEYS.SettingsProps.elasticHost,
                    KEYS.SettingsProps.elasticPort,
                    KEYS.SettingsProps.elasticIndex
            ),
            file,
            useStreamsConfig = true
    )

    val topology = KafkaTopology(settings).build()
    private val stream = KafkaStreams(topology, settings.kafkaStreamsSettings)

    fun run() {
        stream.use {
            it.start()
            while (stream.state().isRunning) {
                log.info("Service is running.")
                Thread.sleep(10_000L)
            }
            it.cleanUp()
        }
        log.error("The streams application ended.")
        exitProcess(1)
    }
}