/*
 * ============LICENSE_START=======================================================
 * dcaegen2-collectors-veshv
 * ================================================================================
 * Copyright (C) 2019 NOKIA
 * ================================================================================
 * 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.dcae.collectors.veshv.utils

import java.util.concurrent.atomic.AtomicReference

/**
 * @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
 * @since January 2019
 */

private val currentShutdownHook = AtomicReference<Thread>()

fun registerShutdownHook(job: () -> Unit) {
    val runtime = Runtime.getRuntime()
    val newShutdownHook = Thread({ job() }, "GracefulShutdownThread")
    currentShutdownHook.get()?.run(runtime::removeShutdownHook)
    currentShutdownHook.set(newShutdownHook)
    runtime.addShutdownHook(newShutdownHook)
}