org.ownchan.server.joint.scheduler.service.SchedulerService.java Source code

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Here is the source code for org.ownchan.server.joint.scheduler.service.SchedulerService.java

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/*******************************************************************************
 * @author Stefan Gndhr <stefan@guendhoer.com>
 *
 * @copyright Copyright (c) 2017, Stefan Gndhr <stefan@guendhoer.com>
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * 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, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *******************************************************************************/
package org.ownchan.server.joint.scheduler.service;

import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;

import org.apache.commons.lang3.time.DurationFormatUtils;
import org.slf4j.Logger;
import org.springframework.stereotype.Service;
import org.springframework.util.StopWatch;

@Service
public class SchedulerService {

    private static final String MESSAGE_TEMPLATE_PROCESSED = "{} finished; waited for {} cronjob futures, {} failures occurred, took {}";

    public <T> void waitForCronjobFutures(List<Future<T>> futures, String jobName, Logger jobLogger) {
        jobLogger.debug(jobName + " started...");
        StopWatch stopWatch = new StopWatch();
        stopWatch.start();

        long countProcessed = 0;
        long countFailed = 0;
        for (Future<T> future : futures) {
            try {
                // result might be of type Void, so in fact we might not get a result at all ...
                T result = future.get();
                if (result instanceof Boolean && !(Boolean) result) {
                    ++countFailed;
                }
            } catch (Exception e) {
                Throwable t = unwrapExecutionExceptionIfPossible(e);
                jobLogger.error(t.getMessage(), t);
                ++countFailed;
            }

            ++countProcessed;
        }

        stopWatch.stop();

        jobLogger.info(MESSAGE_TEMPLATE_PROCESSED, jobName, countProcessed, countFailed,
                DurationFormatUtils.formatDurationHMS(stopWatch.getTotalTimeMillis()));
    }

    private Throwable unwrapExecutionExceptionIfPossible(Exception ex) {
        if (ex instanceof ExecutionException) {
            ExecutionException execEx = (ExecutionException) ex;
            return execEx.getCause();
        }

        return ex;
    }

}