Convert deprecated legacy cron task to Tasks API

Author: jcharaoui

classes/task/update_dirty_sets.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace mod_wwassignment\task;
+
+defined('MOODLE_INTERNAL') || die();
+
+class update_dirty_sets extends \core\task\scheduled_task {
+    public function get_name() {
+        return get_string('updatedirtysets', 'mod_wwassignment');
+    }
+
+    public function execute() {
+        global $CFG;
+        require_once($CFG->dirroot . '/mod/wwassignment/locallib.php');
+
+        _wwassignment_update_dirty_sets();
+    }
+}

db/tasks.php

@@ -0,0 +1,15 @@
+<?php
+
+defined('MOODLE_INTERNAL') || die();
+
+$tasks = array(
+    array(
+        'classname' => 'mod_wwassignment\task\updatedirtysets',
+        'blocking' => 0,
+        'minute' => 'R',
+        'hour' => '4',
+        'day' => '*',
+        'month' => '*',
+        'dayofweek' => '*'
+    )
+);

lib.php

@@ -508,25 +508,6 @@ function wwassignment_print_recent_activity($course, $isteacher, $timestart) {
         return false;  //  True if anything was printed, otherwise false 
 }
 
-/**
-* @desc Function that is run by the cron job. This makes sure that 
-* the grades and all other data are pulled from webwork.
-* returns true if successful
-*/
-function wwassignment_cron() {	
-    traceLog("-------------Begin wwassignment_cron-------------------------");
-
-    //FIXME: Add a call that updates all events with dates (in case people forgot to push)
-    //wwassignment_refresh_events();
-    //FIXME: Add a call that updates all grades in all courses
-    //wwassignment_update_grades(null,0); 
-   //try {    // try didn't work on some php systems -- leave it out.
-    	 _wwassignment_update_dirty_sets();
-    traceLog("---------------------End wwassignment_cron------------------------");
-    return true;
-}
-
-
 // reference material for improving update dirty sets:
 //  from wiki/lib /print_recent_activity 
 //  $sql = "SELECT l.*, cm.instance FROM {$CFG->prefix}log l 

version.php

@@ -24,9 +24,8 @@
 
 // 3.0+
 defined('MOODLE_INTERNAL') || die();
-$plugin->version   = 2015030918;  // The current module version (Date: YYYYMMDDXX)
+$plugin->version   = 2015030919;  // The current module version (Date: YYYYMMDDXX)
 $plugin->requires  = 2014110400;        // Requires this Moodle version
-$plugin->cron      = 300;         // Period for cron to check this module (secs) -- every 5 minutes
 $plugin->component = 'mod_wwassignment';
 $plugin->maturity  = MATURITY_STABLE;