File "ActionScheduler_FatalErrorMonitor.php"

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<?php

class ActionScheduler_FatalErrorMonitor
{
    private $claim = NULL;
    private $store = NULL;
    private $action_id = 0;
    public function __construct(ActionScheduler_Store $store)
    {
        $this->store = $store;
    }
    public function attach(ActionScheduler_ActionClaim $claim)
    {
        $this->claim = $claim;
        add_action('shutdown', array($this, 'handle_unexpected_shutdown'));
        add_action('action_scheduler_before_execute', array($this, 'track_current_action'), 0, 1);
        add_action('action_scheduler_after_execute', array($this, 'untrack_action'), 0, 0);
        add_action('action_scheduler_execution_ignored', array($this, 'untrack_action'), 0, 0);
        add_action('action_scheduler_failed_execution', array($this, 'untrack_action'), 0, 0);
    }
    public function detach()
    {
        $this->claim = NULL;
        $this->untrack_action();
        remove_action('shutdown', array($this, 'handle_unexpected_shutdown'));
        remove_action('action_scheduler_before_execute', array($this, 'track_current_action'), 0);
        remove_action('action_scheduler_after_execute', array($this, 'untrack_action'), 0);
        remove_action('action_scheduler_execution_ignored', array($this, 'untrack_action'), 0);
        remove_action('action_scheduler_failed_execution', array($this, 'untrack_action'), 0);
    }
    public function track_current_action($action_id)
    {
        $this->action_id = $action_id;
    }
    public function untrack_action()
    {
        $this->action_id = 0;
    }
    public function handle_unexpected_shutdown()
    {
        if ($error = error_get_last()) {
            if (in_array($error['type'], array(E_ERROR, E_PARSE, E_COMPILE_ERROR, E_USER_ERROR, E_RECOVERABLE_ERROR))) {
                if (!empty($this->action_id)) {
                    $this->store->mark_failure($this->action_id);
                    do_action('action_scheduler_unexpected_shutdown', $this->action_id, $error);
                }
            }
            $this->store->release_claim($this->claim);
        }
    }
}