com.github.kagkarlsson.scheduler.RunUntilShutdown Maven / Gradle / Ivy

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Simple persistent scheduler for scheduled tasks, recurring or ad-hoc.

There is a newer version: 15.0.0

/**
 * Copyright (C) Gustav Karlsson
 *
 * 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.github.kagkarlsson.scheduler;

import com.github.kagkarlsson.scheduler.stats.StatsRegistry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

class RunUntilShutdown implements Runnable {
    private static final Logger LOG = LoggerFactory.getLogger(RunUntilShutdown.class);
    private final Runnable toRun;
    private final Waiter waitBetweenRuns;
    private final SchedulerState schedulerState;
    private final StatsRegistry statsRegistry;

    public RunUntilShutdown(Runnable toRun, Waiter waitBetweenRuns, SchedulerState schedulerState, StatsRegistry statsRegistry) {
        this.toRun = toRun;
        this.waitBetweenRuns = waitBetweenRuns;
        this.schedulerState = schedulerState;
        this.statsRegistry = statsRegistry;
    }

    @Override
    public void run() {
        while (!schedulerState.isShuttingDown()) {
            if (!schedulerState.isPaused()) {
                try {
                    toRun.run();
                } catch (Throwable e) {
                    LOG.error("Unhandled exception. Will keep running.", e);
                    statsRegistry.register(StatsRegistry.SchedulerStatsEvent.UNEXPECTED_ERROR);
                }
            }

            try {
                waitBetweenRuns.doWait();
            } catch (InterruptedException interruptedException) {
                if (schedulerState.isShuttingDown()) {
                    LOG.debug("Thread '{}' interrupted due to shutdown.", Thread.currentThread().getName());
                } else {
                    LOG.error("Unexpected interruption of thread. Will keep running.", interruptedException);
                    statsRegistry.register(StatsRegistry.SchedulerStatsEvent.UNEXPECTED_ERROR);
                }
            }
        }
    }
}