function advagg_find_existing_bundle

Given a list of files, see if a bundle already exists containing all of those files. If in strict mode then the file count has to be the same.

Paramètres

$files: List of files in the proposed bundle.

$bundle_md5: Bundle's machine name.

Fichier

./advagg.module, line 1021

Code

function advagg_find_existing_bundle(&$files, &$bundle_md5) {
    // Sort files for better cache hits.
    $temp_files = $files;
    sort($temp_files);
    $schema = advagg_get_server_schema();
    $cached_data_key = 'advagg_existing_' . md5($schema . implode('', $temp_files));
    // Try cache first; cache table is cache_advagg_bundle_reuse. string is debug name.
    $cached_data = advagg_cached_bundle_get($cached_data_key, 'advagg_find_existing_bundle');
    if (!empty($cached_data)) {
        $files = $cached_data[0]['files'];
        $bundle_md5 = $cached_data[0]['bundle_md5'];
        return;
    }
    // Build union query.
    $query = 'SELECT root.bundle_md5 FROM {advagg_bundles} AS root';
    $joins = array();
    $wheres = array();
    $args = array();
    $counter = 0;
    foreach ($files as $filename) {
        // Use alpha for table aliases; numerics do not work.
        $key = strtr($counter, '01234567890', 'abcdefghij');
        $joins[$key] = "\nINNER JOIN {advagg_bundles} AS {$key} USING(bundle_md5)\n";
        if ($counter == 0) {
            $wheres[$key] = "WHERE {$key}.filename_md5 = '%s'";
        }
        else {
            $wheres[$key] = "AND {$key}.filename_md5 = '%s'";
        }
        $args[$key] = md5($filename);
        $counter++;
    }
    $query .= implode("\n", $joins);
    $query .= implode("\n", $wheres);
    $query .= ' GROUP BY bundle_md5';
    // Find matching bundles and select first good one.
    $files_count = count($files);
    $results = db_query($query, $args);
    while ($new_md5 = $results->fetchField()) {
        $count = db_query("SELECT count(*) FROM {advagg_bundles} WHERE bundle_md5 = :bundle_md5", array(
            ':bundle_md5' => $new_md5,
        ))->fetchField();
        // Make sure bundle has the same number of files if using strict matching.
        if (!empty($count) && $count == $files_count) {
            $bundle_md5 = $new_md5;
            $data = array(
                array(
                    'files' => $files,
                    'bundle_md5' => $bundle_md5,
                ),
            );
            cache_set($cached_data_key, $data, 'cache_advagg_bundle_reuse', CACHE_TEMPORARY);
            return;
        }
    }
}