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✏️ Editing: file_progress.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Simple interface for receiving progress during long-running file
 * operations.
 *
 * In some cases progress can be reported precisely. In other cases,
 * progress is indeterminate which means that the progress function is called
 * periodically but without information on completion.
 *
 * @package core_files
 * @copyright 2013 The Open University
 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
interface file_progress {
    /**
     * @var int Constant used for indeterminate progress.
     */
    const INDETERMINATE = -1;

/**
     * Called during a file processing operation that reports progress.
     *
     * This function will be called periodically during the operation, assuming
     * it is successful.
     *
     * The $max value will be the same for each call to progress() within an
     * operation.
     *
     * If numbers (rather than INDETERMINATE) are provided, then:
     * - The $progress value will either be the same as last call, or increased
     *   by some value (not necessarily 1)
     * - The $progress value will be less than or equal to the $max value.
     *
     * There is no guarantee that this function will be called for every value
     * in the range, or that it will be called with $progress == $max.
     *
     * The function may be called very frequently (e.g. after each file) or
     * quite rarely (e.g. after each large file).
     *
     * When creating an implementation of this function, you probably want to
     * do the following:
     *
     * 1. Check the current time and do not do anything if it's less than a
     *    second since the last time you reported something.
     * 2. Update the PHP timeout (i.e. set it back to 2 minutes or whatever)
     *    so that the system will not time out.
     * 3. If the progress is unchanged since last second, still display some
     *    output to the user. (Setting PHP timeout is not sufficient; some
     *    front-end servers require that data is output to the browser every
     *    minute or so, or they will time out on their own.)
     *
     * @param int $progress Current progress, or INDETERMINATE if unknown
     * @param int $max Max progress, or INDETERMINATE if unknown
     */
    public function progress($progress = self::INDETERMINATE, $max = self::INDETERMINATE);
}

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