/*-
 * ============LICENSE_START=======================================================
 * SDC
 * ================================================================================
 * Copyright (C) 2019 AT&T Intellectual Property. 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.openecomp.sdc.be.components.scheduledtasks;

import org.openecomp.sdc.common.log.wrappers.Logger;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.TimeUnit;


public abstract class AbstractScheduleTaskRunner {
    private static final Logger log = Logger.getLogger(AbstractScheduleTaskRunner.class);
    public abstract ExecutorService getExecutorService();

    protected void shutdownExecutor() {
        ExecutorService executorService = getExecutorService();
        if (executorService == null)
            return;

        executorService.shutdown(); // Disable new tasks from being submitted
        try {
            // Wait a while for existing tasks to terminate
            if (!executorService.awaitTermination(60, TimeUnit.SECONDS)) {
                executorService.shutdownNow(); // Cancel currently executing
                                                // tasks
                // Wait a while for tasks to respond to being cancelled
                if (!executorService.awaitTermination(60, TimeUnit.SECONDS))
                    log.debug("Pool did not terminate");
            }
        } catch (InterruptedException ie) {
            // (Re-)Cancel if current thread also interrupted
            executorService.shutdownNow();
            // Preserve interrupt status
            Thread.currentThread().interrupt();
        }
    }
}