simpletrigger.java

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/* 
 * Copyright 2004-2005 OpenSymphony 
 * 
 * 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.
 * 
 */

/*
 * Previously Copyright (c) 2001-2004 James House
 */
package org.quartz;

import java.util.Date;


/**
 * <p>
 * A concrete <code>{@link Trigger}</code> that is used to fire a <code>{@link org.quartz.JobDetail}</code>
 * at a given moment in time, and optionally repeated at a specified interval.
 * </p>
 * 
 * @see Trigger
 * @see CronTrigger
 * @see TriggerUtils
 * 
 * @author James House
 * @author contributions by Lieven Govaerts of Ebitec Nv, Belgium.
 */
public class SimpleTrigger extends Trigger {

    /*
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     * 
     * Constants.
     * 
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     */

    /**
     * <p>
     * Instructs the <code>{@link Scheduler}</code> that upon a mis-fire
     * situation, the <code>{@link SimpleTrigger}</code> wants to be fired
     * now by <code>Scheduler</code>.
     * </p>
     * 
     * <p>
     * <i>NOTE:</i> This instruction should typically only be used for
     * 'one-shot' (non-repeating) Triggers. If it is used on a trigger with a
     * repeat count > 0 then it is equivalent to the instruction <code>{@link #MISFIRE_INSTRUCTION_RESCHEDULE_NOW_WITH_REMAINING_REPEAT_COUNT}
     * </code>.
     * </p>
     */
    public static final int MISFIRE_INSTRUCTION_FIRE_NOW = 1;

    /**
     * <p>
     * Instructs the <code>{@link Scheduler}</code> that upon a mis-fire
     * situation, the <code>{@link SimpleTrigger}</code> wants to be
     * re-scheduled to 'now' (even if the associated <code>{@link Calendar}</code>
     * excludes 'now') with the repeat count left as-is.
     * </p>
     * 
     * <p>
     * <i>NOTE:</i> Use of this instruction causes the trigger to 'forget'
     * the start-time and repeat-count that it was originally setup with (this
     * is only an issue if you for some reason wanted to be able to tell what
     * the original values were at some later time).
     * </p>
     * 
     * <p>
     * <i>NOTE:</i> This instruction could cause the <code>Trigger</code>
     * to go to the 'COMPLETE' state after firing 'now', if all the
     * repeat-fire-times where missed.
     * </p>
     */
    public static final int MISFIRE_INSTRUCTION_RESCHEDULE_NOW_WITH_EXISTING_REPEAT_COUNT = 2;

    /**
     * <p>
     * Instructs the <code>{@link Scheduler}</code> that upon a mis-fire
     * situation, the <code>{@link SimpleTrigger}</code> wants to be
     * re-scheduled to 'now' (even if the associated <code>{@link Calendar}</code>
     * excludes 'now') with the repeat count set to what it would be, if it had
     * not missed any firings.
     * </p>
     * 
     * <p>
     * <i>NOTE:</i> Use of this instruction causes the trigger to 'forget'
     * the start-time and repeat-count that it was originally setup with (this
     * is only an issue if you for some reason wanted to be able to tell what
     * the original values were at some later time).
     * </p>
     * 
     * <p>
     * <i>NOTE:</i> This instruction could cause the <code>Trigger</code>
     * to go to the 'COMPLETE' state after firing 'now', if all the
     * repeat-fire-times where missed.
     * </p>
     */
    public static final int MISFIRE_INSTRUCTION_RESCHEDULE_NOW_WITH_REMAINING_REPEAT_COUNT = 3;

    /**
     * <p>
     * Instructs the <code>{@link Scheduler}</code> that upon a mis-fire
     * situation, the <code>{@link SimpleTrigger}</code> wants to be
     * re-scheduled to the next scheduled time after 'now' - taking into
     * account any associated <code>{@link Calendar}</code>, and with the
     * repeat count set to what it would be, if it had not missed any firings.
     * </p>
     * 
     * <p>
     * <i>NOTE/WARNING:</i> This instruction could cause the <code>Trigger</code>
     * to go directly to the 'COMPLETE' state if all fire-times where missed.
     * </p>
     */
    public static final int MISFIRE_INSTRUCTION_RESCHEDULE_NEXT_WITH_REMAINING_COUNT = 4;

    /**
     * <p>
     * Instructs the <code>{@link Scheduler}</code> that upon a mis-fire
     * situation, the <code>{@link SimpleTrigger}</code> wants to be
     * re-scheduled to the next scheduled time after 'now' - taking into
     * account any associated <code>{@link Calendar}</code>, and with the
     * repeat count left unchanged.
     * </p>
     * 
     * <p>
     * <i>NOTE:</i> Use of this instruction causes the trigger to 'forget'
     * the repeat-count that it was originally setup with (this is only an
     * issue if you for some reason wanted to be able to tell what the original
     * values were at some later time).
     * </p>
     * 
     * <p>
     * <i>NOTE/WARNING:</i> This instruction could cause the <code>Trigger</code>
     * to go directly to the 'COMPLETE' state if all fire-times where missed.
     * </p>
     */
    public static final int MISFIRE_INSTRUCTION_RESCHEDULE_NEXT_WITH_EXISTING_COUNT = 5;

    /**
     * <p>
     * Used to indicate the 'repeat count' of the trigger is indefinite. Or in
     * other words, the trigger should repeat continually until the trigger's
     * ending timestamp.
     * </p>
     */
    public static int REPEAT_INDEFINITELY = -1;

    /*
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     * 
     * Data members.
     * 
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     */

    private Date startTime = null;

    private Date endTime = null;

    private Date nextFireTime = null;

    private Date previousFireTime = null;

    private int repeatCount = 0;

    private long repeatInterval = 0;

    private int timesTriggered = 0;

    private boolean complete = false;

    /*
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     * 
     * Constructors.
     * 
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     */

    /**
     * <p>
     * Create a <code>SimpleTrigger</code> with no settings.
     * </p>
     */
    public SimpleTrigger() {
        super();
    }

    /**
     * <p>
     * Create a <code>SimpleTrigger</code> that will occur immediately, and
     * not repeat.
     * </p>
     */
    public SimpleTrigger(String name, String group) {
        this(name, group, new Date(), null, 0, 0);
    }

    /**
     * <p>
     * Create a <code>SimpleTrigger</code> that will occur immediately, and
     * repeat at the the given interval the given number of times.
     * </p>
     */
    public SimpleTrigger(String name, String group, int repeatCount,
            long repeatInterval) {
        this(name, group, new Date(), null, repeatCount, repeatInterval);
    }

    /**
     * <p>
     * Create a <code>SimpleTrigger</code> that will occur at the given time,
     * and not repeat.
     * </p>
     */
    public SimpleTrigger(String name, String group, Date startTime) {
        this(name, group, startTime, null, 0, 0);
    }

    /**
     * <p>
     * Create a <code>SimpleTrigger</code> that will occur at the given time,
     * and repeat at the the given interval the given number of times, or until
     * the given end time.
     * </p>
     * 
     * @param startTime
     *          A <code>Date</code> set to the time for the <code>Trigger</code>
     *          to fire.
     * @param endTime
     *          A <code>Date</code> set to the time for the <code>Trigger</code>
     *          to quit repeat firing.
     * @param repeatCount
     *          The number of times for the <code>Trigger</code> to repeat
     *          firing, use {@link #REPEAT_INDEFINITELY}for unlimitted times.
     * @param repeatInterval
     *          The number of milliseconds to pause between the repeat firing.
     */
    public SimpleTrigger(String name, String group, Date startTime,
            Date endTime, int repeatCount, long repeatInterval) {
        super(name, group);

        setStartTime(startTime);
        setEndTime(endTime);
        setRepeatCount(repeatCount);
        setRepeatInterval(repeatInterval);
    }

    /**
     * <p>
     * Create a <code>SimpleTrigger</code> that will occur at the given time,
     * fire the identified <code>Job</code> and repeat at the the given
     * interval the given number of times, or until the given end time.
     * </p>
     * 
     * @param startTime
     *          A <code>Date</code> set to the time for the <code>Trigger</code>
     *          to fire.
     * @param endTime
     *          A <code>Date</code> set to the time for the <code>Trigger</code>
     *          to quit repeat firing.
     * @param repeatCount
     *          The number of times for the <code>Trigger</code> to repeat
     *          firing, use {@link #REPEAT_INDEFINITELY}for unlimitted times.
     * @param repeatInterval
     *          The number of milliseconds to pause between the repeat firing.
     */
    public SimpleTrigger(String name, String group, String jobName,
            String jobGroup, Date startTime, Date endTime, int repeatCount,
            long repeatInterval) {
        super(name, group, jobName, jobGroup);

        setStartTime(startTime);
        setEndTime(endTime);
        setRepeatCount(repeatCount);
        setRepeatInterval(repeatInterval);
    }

    /*
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     * 
     * Interface.
     * 
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     */

    /**
     * <p>
     * Get the time at which the <code>SimpleTrigger</code> should occur.
     * </p>
     */
    public Date getStartTime() {
        return startTime;
    }

    /**
     * <p>
     * Set the time at which the <code>SimpleTrigger</code> should occur.
     * </p>
     * 
     * @exception IllegalArgumentException
     *              if startTime is <code>null</code>.
     */
    public void setStartTime(Date startTime) {
        if (startTime == null)
                throw new IllegalArgumentException("Start time cannot be null");

        Date eTime = getEndTime();
        if (eTime != null && startTime != null && eTime.before(startTime))
            throw new IllegalArgumentException(
            "End time cannot be before start time");

        this.startTime = startTime;
    }

    /**
     * <p>
     * Get the time at which the <code>SimpleTrigger</code> should quit
     * repeating - even if repeastCount isn't yet satisfied.
     * </p>
     * 
     * @see #getFinalFireTime()
     */
    public Date getEndTime() {
        return endTime;
    }

    /**
     * <p>
     * Set the time at which the <code>SimpleTrigger</code> should quit
     * repeating (and be automatically deleted).
     * </p>
     * 
     * @exception IllegalArgumentException
     *              if endTime is before start time.
     */
    public void setEndTime(Date endTime) {
        Date sTime = getStartTime();
        if (sTime != null && endTime != null && sTime.after(endTime))
                throw new IllegalArgumentException(
                        "End time cannot be before start time");

        this.endTime = endTime;
    }

    /**
     * <p>
     * Get the the number of times the <code>SimpleTrigger</code> should
     * repeat, after which it will be automatically deleted.
     * </p>
     * 
     * @see #REPEAT_INDEFINITELY
     */
    public int getRepeatCount() {
        return repeatCount;
    }

    /**
     * <p>
     * Set the the number of time the <code>SimpleTrigger</code> should
     * repeat, after which it will be automatically deleted.
     * </p>
     * 
     * @see #REPEAT_INDEFINITELY
     * @exception IllegalArgumentException
     *              if repeatCount is < 0
     */
    public void setRepeatCount(int repeatCount) {
        if (repeatCount < 0 && repeatCount != REPEAT_INDEFINITELY)
                throw new IllegalArgumentException(
                        "Repeat count must be >= 0, use the "
                                + "constant REPEAT_INDEFINITELY for infinite.");

        this.repeatCount = repeatCount;
    }

    /**
     * <p>
     * Get the the time interval (in milliseconds) at which the <code>SimpleTrigger</code>
     * should repeat.
     * </p>
     */
    public long getRepeatInterval() {
        return repeatInterval;
    }

    /**
     * <p>
     * Set the the time interval (in milliseconds) at which the <code>SimpleTrigger</code>
     * should repeat.
     * </p>
     * 
     * @exception IllegalArgumentException
     *              if repeatInterval is <= 0
     */
    public void setRepeatInterval(long repeatInterval) {
        if (repeatInterval < 0)
                throw new IllegalArgumentException(
                        "Repeat interval must be >= 0");

        this.repeatInterval = repeatInterval;
    }

    /**
     * <p>
     * Get the number of times the <code>SimpleTrigger</code> has already
     * fired.
     * </p>