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<?php defined("SYSPATH") or die("No direct script access.");
/**
* Gallery - a web based photo album viewer and editor
* Copyright (C) 2000-2013 Bharat Mediratta
*
* This program 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 2 of the License, or (at
* your option) any later version.
*
* 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 GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
*/
class task_Core {
/**
* Get all available tasks
*/
static function get_definitions() {
$tasks = array();
foreach (module::active() as $module) {
$class_name = "{$module->name}_task";
if (class_exists($class_name) && method_exists($class_name, "available_tasks")) {
foreach (call_user_func(array($class_name, "available_tasks")) as $task) {
$tasks[$task->callback] = $task;
}
}
}
return $tasks;
}
static function start($task_callback, $context=array()) {
$tasks = task::get_definitions();
$task = task::create($tasks[$task_callback], array());
$task->log(t("Task %task_name started (task id %task_id)",
array("task_name" => $task->name, "task_id" => $task->id)));
return $task;
}
static function create($task_def, $context) {
$task = ORM::factory("task");
$task->callback = $task_def->callback;
$task->name = $task_def->name;
$task->percent_complete = 0;
$task->status = "";
$task->state = "started";
$task->owner_id = identity::active_user()->id;
$task->context = serialize($context);
$task->save();
return $task;
}
static function cancel($task_id) {
$task = ORM::factory("task", $task_id);
if (!$task->loaded()) {
throw new Exception("@todo MISSING_TASK");
}
$task->done = 1;
$task->state = "cancelled";
$task->log(t("Task %task_name cancelled (task id %task_id)",
array("task_name" => $task->name, "task_id" => $task->id)));
$task->save();
return $task;
}
static function remove($task_id) {
$task = ORM::factory("task", $task_id);
if ($task->loaded()) {
$task->delete();
}
}
static function run($task_id) {
$task = ORM::factory("task", $task_id);
if (!$task->loaded()) {
throw new Exception("@todo MISSING_TASK");
}
try {
$task->state = "running";
call_user_func_array($task->callback, array(&$task));
if ($task->done) {
$task->log($task->status);
}
$task->save();
} catch (Exception $e) {
Kohana_Log::add("error", (string)$e);
// Ugh. I hate to use instanceof, But this beats catching the exception separately since
// we mostly want to treat it the same way as all other exceptions
if ($e instanceof ORM_Validation_Exception) {
Kohana_Log::add("error", "Validation errors: " . print_r($e->validation->errors(), 1));
}
$task->log((string)$e);
$task->state = "error";
$task->done = true;
$task->status = substr($e->getMessage(), 0, 255);
$task->save();
}
return $task;
}
}
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