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<?php
/**
 * Elgg Cron trigger.
 * When enabled this plugin provides "poor man's cron" functionality to trigger
 * elgg cron scripts without the need to install the cron script.
 *
 * Note, this is a substitute and not a replacement for the cron script.
 * It is recommended that you use the cron script where possible.
 *
 * @package ElggCronTrigger
 */

elgg_register_event_handler('init', 'system', 'crontrigger_init');

function crontrigger_init() {
	elgg_register_event_handler('shutdown', 'system', 'crontrigger_shutdownhook');
}

function crontrigger_trigger($period) {
	elgg_trigger_plugin_hook('cron', $period);
}

function crontrigger_minute() {
	crontrigger_trigger('minute');
}

function crontrigger_fiveminute() {
	crontrigger_trigger('fiveminute');
}

function crontrigger_fifteenmin() {
	crontrigger_trigger('fifteenmin');
}

function crontrigger_halfhour() {
	crontrigger_trigger('halfhour');
}

function crontrigger_hourly() {
	crontrigger_trigger('hourly');
}

function crontrigger_daily() {
	crontrigger_trigger('daily');
}

function crontrigger_weekly() {
	crontrigger_trigger('weekly');
}

function crontrigger_monthly() {
	crontrigger_trigger('monthly');
}

function crontrigger_yearly() {
	crontrigger_trigger('yearly');
}

/**
 * Call cron hooks after a page has been displayed (so user won't notice any slowdown).
 *
 * If people are not viewing pages quickly enough, the scheduled triggers will
 * not occur.
 */
function crontrigger_shutdownhook() {

	$minute = 60;
	$fiveminute = $minute * 5;
	$fifteenmin = $minute * 15;
	$halfhour = $minute * 30;
	$hour = 3600;
	$day = $hour * 24;
	$week = $day * 7;
	$month = $week * 4;
	$year = $month * 12;

	$now = time();

	ob_start();
	run_function_once('crontrigger_minute', $now - $minute);
	run_function_once('crontrigger_fiveminute', $now - $fiveminute);
	run_function_once('crontrigger_fifteenmin', $now - $fifteenmin);
	run_function_once('crontrigger_halfhour', $now - $halfhour);
	run_function_once('crontrigger_hourly', $now - $hour);
	run_function_once('crontrigger_daily', $now - $day);
	run_function_once('crontrigger_weekly', $now - $week);
	run_function_once('crontrigger_monthly', $now - $month);
	run_function_once('crontrigger_yearly', $now - $year);
	ob_clean();
}