127 lines
5 KiB
PHP
127 lines
5 KiB
PHP
<?php
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/**
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* @file
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* Callbacks provided by the form system.
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*/
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/**
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* @addtogroup callbacks
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* @{
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*/
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/**
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* Perform a single batch operation.
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*
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* Callback for batch_set().
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*
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* @param $MULTIPLE_PARAMS
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* Additional parameters specific to the batch. These are specified in the
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* array passed to batch_set().
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* @param $context
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* The batch context array, passed by reference. This contains the following
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* properties:
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* - 'finished': A float number between 0 and 1 informing the processing
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* engine of the completion level for the operation. 1 (or no value
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* explicitly set) means the operation is finished: the operation will not
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* be called again, and execution passes to the next operation or the
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* callback_batch_finished() implementation. Any other value causes this
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* operation to be called again; however it should be noted that the value
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* set here does not persist between executions of this callback: each time
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* it is set to 1 by default by the batch system.
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* - 'sandbox': This may be used by operations to persist data between
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* successive calls to the current operation. Any values set in
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* $context['sandbox'] will be there the next time this function is called
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* for the current operation. For example, an operation may wish to store a
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* pointer in a file or an offset for a large query. The 'sandbox' array key
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* is not initially set when this callback is first called, which makes it
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* useful for determining whether it is the first call of the callback or
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* not:
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* @code
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* if (empty($context['sandbox'])) {
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* // Perform set-up steps here.
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* }
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* @endcode
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* The values in the sandbox are stored and updated in the database between
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* http requests until the batch finishes processing. This avoids problems
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* if the user navigates away from the page before the batch finishes.
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* - 'message': A text message displayed in the progress page.
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* - 'results': The array of results gathered so far by the batch processing.
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* This array is highly useful for passing data between operations. After
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* all operations have finished, this is passed to callback_batch_finished()
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* where results may be referenced to display information to the end-user,
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* such as how many total items were processed.
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*/
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function callback_batch_operation($MULTIPLE_PARAMS, &$context) {
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if (!isset($context['sandbox']['progress'])) {
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$context['sandbox']['progress'] = 0;
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$context['sandbox']['current_node'] = 0;
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$context['sandbox']['max'] = db_query('SELECT COUNT(DISTINCT nid) FROM {node}')->fetchField();
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}
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// For this example, we decide that we can safely process
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// 5 nodes at a time without a timeout.
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$limit = 5;
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// With each pass through the callback, retrieve the next group of nids.
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$result = db_query_range("SELECT nid FROM {node} WHERE nid > %d ORDER BY nid ASC", $context['sandbox']['current_node'], 0, $limit);
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while ($row = db_fetch_array($result)) {
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// Here we actually perform our processing on the current node.
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$node = node_load($row['nid'], NULL, TRUE);
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$node->value1 = $options1;
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$node->value2 = $options2;
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node_save($node);
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// Store some result for post-processing in the finished callback.
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$context['results'][] = check_plain($node->title);
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// Update our progress information.
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$context['sandbox']['progress']++;
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$context['sandbox']['current_node'] = $node->nid;
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$context['message'] = t('Now processing %node', array('%node' => $node->title));
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}
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// Inform the batch engine that we are not finished,
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// and provide an estimation of the completion level we reached.
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if ($context['sandbox']['progress'] != $context['sandbox']['max']) {
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$context['finished'] = $context['sandbox']['progress'] / $context['sandbox']['max'];
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}
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}
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/**
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* Complete a batch process.
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*
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* Callback for batch_set().
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*
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* This callback may be specified in a batch to perform clean-up operations, or
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* to analyze the results of the batch operations.
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*
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* @param $success
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* A boolean indicating whether the batch has completed successfully.
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* @param $results
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* The value set in $context['results'] by callback_batch_operation().
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* @param $operations
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* If $success is FALSE, contains the operations that remained unprocessed.
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*/
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function callback_batch_finished($success, $results, $operations) {
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if ($success) {
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// Here we do something meaningful with the results.
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$message = t("!count items were processed.", array(
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'!count' => count($results),
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));
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$message .= theme('item_list', array('items' => $results));
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drupal_set_message($message);
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}
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else {
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// An error occurred.
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// $operations contains the operations that remained unprocessed.
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$error_operation = reset($operations);
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$message = t('An error occurred while processing %error_operation with arguments: @arguments', array(
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'%error_operation' => $error_operation[0],
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'@arguments' => print_r($error_operation[1], TRUE)
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));
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drupal_set_message($message, 'error');
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}
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}
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