function _batch_process

Processes sets in a batch.

If the batch was marked for progressive execution (default), this executes as many operations in batch sets until an execution time of 1 second has been exceeded. It will continue with the next operation of the same batch set in the next request.

Return value

array An array containing a completion value (in percent) and a status message.

File

core/includes/batch.inc, line 251

Code

function _batch_process() {
    $batch =& batch_get();
    $current_set =& _batch_current_set();
    // Indicate that this batch set needs to be initialized.
    $set_changed = TRUE;
    $task_message = '';
    // If this batch was marked for progressive execution (e.g. forms submitted by
    // \Drupal::formBuilder()->submitForm(), initialize a timer to determine
    // whether we need to proceed with the same batch phase when a processing time
    // of 1 second has been exceeded.
    if ($batch['progressive']) {
        Timer::start('batch_processing');
    }
    if (empty($current_set['start'])) {
        $current_set['start'] = microtime(TRUE);
    }
    $queue = _batch_queue($current_set);
    while (!$current_set['success']) {
        // If this is the first time we iterate this batch set in the current
        // request, we check if it requires an additional file for functions
        // definitions.
        if ($set_changed && isset($current_set['file']) && is_file($current_set['file'])) {
            include_once \Drupal::root() . '/' . $current_set['file'];
        }
        $task_message = '';
        // Assume a single pass operation and set the completion level to 1 by
        // default.
        $finished = 1;
        if ($item = $queue->claimItem()) {
            list($callback, $args) = $item->data;
            // Build the 'context' array and execute the function call.
            $batch_context = [
                'sandbox' => &$current_set['sandbox'],
                'results' => &$current_set['results'],
                'finished' => &$finished,
                'message' => &$task_message,
            ];
            call_user_func_array($callback, array_merge($args, [
                &$batch_context,
            ]));
            if ($finished >= 1) {
                // Make sure this step is not counted twice when computing $current.
                $finished = 0;
                // Remove the processed operation and clear the sandbox.
                $queue->deleteItem($item);
                $current_set['count']--;
                $current_set['sandbox'] = [];
            }
        }
        // When all operations in the current batch set are completed, browse
        // through the remaining sets, marking them 'successfully processed'
        // along the way, until we find a set that contains operations.
        // _batch_next_set() executes form submit handlers stored in 'control'
        // sets (see \Drupal::service('form_submitter')), which can in turn add new
        // sets to the batch.
        $set_changed = FALSE;
        $old_set = $current_set;
        while (empty($current_set['count']) && ($current_set['success'] = TRUE) && _batch_next_set()) {
            $current_set =& _batch_current_set();
            $current_set['start'] = microtime(TRUE);
            $set_changed = TRUE;
        }
        // At this point, either $current_set contains operations that need to be
        // processed or all sets have been completed.
        $queue = _batch_queue($current_set);
        // If we are in progressive mode, break processing after 1 second.
        if ($batch['progressive'] && Timer::read('batch_processing') > 1000) {
            // Record elapsed wall clock time.
            $current_set['elapsed'] = round((microtime(TRUE) - $current_set['start']) * 1000, 2);
            break;
        }
    }
    if ($batch['progressive']) {
        // Gather progress information.
        // Reporting 100% progress will cause the whole batch to be considered
        // processed. If processing was paused right after moving to a new set,
        // we have to use the info from the new (unprocessed) set.
        if ($set_changed && isset($current_set['queue'])) {
            // Processing will continue with a fresh batch set.
            $remaining = $current_set['count'];
            $total = $current_set['total'];
            $progress_message = $current_set['init_message'];
            $task_message = '';
        }
        else {
            // Processing will continue with the current batch set.
            $remaining = $old_set['count'];
            $total = $old_set['total'];
            $progress_message = $old_set['progress_message'];
        }
        // Total progress is the number of operations that have fully run plus the
        // completion level of the current operation.
        $current = $total - $remaining + $finished;
        $percentage = _batch_api_percentage($total, $current);
        $elapsed = isset($current_set['elapsed']) ? $current_set['elapsed'] : 0;
        $values = [
            '@remaining' => $remaining,
            '@total' => $total,
            '@current' => floor($current),
            '@percentage' => $percentage,
            '@elapsed' => \Drupal::service('date.formatter')->formatInterval($elapsed / 1000),
            // If possible, estimate remaining processing time.
'@estimate' => $current > 0 ? \Drupal::service('date.formatter')->formatInterval($elapsed * ($total - $current) / $current / 1000) : '-',
        ];
        $message = strtr($progress_message, $values);
        return [
            $percentage,
            $message,
            $task_message,
        ];
    }
    else {
        // If we are not in progressive mode, the entire batch has been processed.
        return _batch_finished();
    }
}