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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * 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
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog.scheduler.clock;

import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;

import java.time.Instant;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.util.concurrent.TimeUnit;

/**
 * A clock that provides access to the current {@link DateTime}.
 */
public interface JobSchedulerClock {
    /**
     * Returns the current UTC time.
     *
     * @return current time
     */
    DateTime nowUTC();

    /**
     * Returns the current java.time.Instant.
     *
     * @return current time as {@link Instant}
     */
    Instant instantNow();

    /**
     * Returns the current time for the give time zone.
     *
     * @return current time
     */
    DateTime now(DateTimeZone zone);

    /**
     * Returns the current time for the give time zone.
     *
     * @return current time
     */
    ZonedDateTime now(ZoneId zone);

    /**
     * Causes the current execution thread to sleep for the given duration.
     *
     * @param duration duration value
     * @param unit     duration unit
     * @throws InterruptedException
     */
    void sleep(long duration, TimeUnit unit) throws InterruptedException;

    /**
     * Causes the current execution thread to sleep uninterruptibly for the given duration.
     *
     * @param duration duration value
     * @param unit     duration unit
     */
    void sleepUninterruptibly(long duration, TimeUnit unit);
}