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Drupal example source code file (simple.inc)

This example Drupal source code file (simple.inc) is included in the DevDaily.com "Drupal Source Code Warehouse" project. The intent of this project is to help you "Learn Drupal by Example".

PHP - Drupal tags/keywords

args, array, cache, cid, conf, contexts, display, function, id, if, isset, pane, php, return

The simple.inc Drupal example source code

<?php
// $Id: simple.inc,v 1.1.2.5 2011/01/07 20:59:09 merlinofchaos Exp $

/**
 * @file
 * Provides a simple time-based caching option for panel panes.
 */

// Plugin definition
$plugin = array(
  'title' => t("Simple cache"),
  'description' => t('Simple caching is a time-based cache. This is a hard limit, and once cached it will remain that way until the time limit expires.'),
  'cache get' => 'panels_simple_cache_get_cache',
  'cache set' => 'panels_simple_cache_set_cache',
  'cache clear' => 'panels_simple_cache_clear_cache',
  'settings form' => 'panels_simple_cache_settings_form',
  'settings form submit' => 'panels_simple_cache_settings_form_submit',
  'defaults' => array(
    'lifetime' => 15,
    'granularity' => 'none',
  ),
);

/**
 * Get cached content.
 */
function panels_simple_cache_get_cache($conf, $display, $args, $contexts, $pane = NULL) {
  $cid = panels_simple_cache_get_id($conf, $display, $args, $contexts, $pane);
  $cache = cache_get($cid, 'cache');
  if (!$cache) {
    return FALSE;
  }

  if ((time() - $cache->created) > $conf['lifetime']) {
    return FALSE;
  }

  return $cache->data;
}

/**
 * Set cached content.
 */
function panels_simple_cache_set_cache($conf, $content, $display, $args, $contexts, $pane = NULL) {
  $cid = panels_simple_cache_get_id($conf, $display, $args, $contexts, $pane);
  cache_set($cid, $content);
}

/**
 * Clear cached content.
 *
 * Cache clears are always for an entire display, regardless of arguments.
 */
function panels_simple_cache_clear_cache($display) {
  $cid = 'panels_simple_cache';

  // This is used in case this is an in-code display, which means did will be something like 'new-1'.
  if (isset($display->owner) && isset($display->owner->id)) {
    $cid .= ':' . $display->owner->id;
  }
  $cid .= ':' . $display->did;

  cache_clear_all($cid, 'cache', TRUE);
}

/**
 * Figure out an id for our cache based upon input and settings.
 */
function panels_simple_cache_get_id($conf, $display, $args, $contexts, $pane) {
  $id = 'panels_simple_cache';

  // This is used in case this is an in-code display, which means did will be something like 'new-1'.
  if (isset($display->owner) && isset($display->owner->id)) {
    $id .= ':' . $display->owner->id;
  }
  $id .= ':' . $display->did;

  if ($pane) {
    $id .= ':' . $pane->pid;
  }

  if (user_access('view pane admin links')) {
    $id .= ':admin';
  }

  switch ($conf['granularity']) {
    case 'args':
      foreach ($args as $arg) {
        $id .= ':' . $arg;
      }
      break;

    case 'context':
      if (!is_array($contexts)) {
        $contexts = array($contexts);
      }
      foreach ($contexts as $context) {
        if (isset($context->argument)) {
          $id .= ':' . $context->argument;
        }
      }
  }
  if (module_exists('locale')) {
    global $language;
    $id .= ':' . $language->language;
  }
  
  if($pane->configuration['use_pager'] == 1) {
    $id .= ':p' . check_plain($_GET['page']);
  }
  
  return $id;
}

function panels_simple_cache_settings_form($conf, $display, $pid) {
  $options = drupal_map_assoc(array(15, 30, 60, 120, 180, 240, 300, 600, 900, 1200, 1800, 3600, 7200, 14400, 28800, 43200, 86400, 172800, 259200, 345600, 604800), 'format_interval');
  $form['lifetime'] = array(
    '#title' => t('Lifetime'),
    '#type' => 'select',
    '#options' => $options,
    '#default_value' => $conf['lifetime'],
  );

  $form['granularity'] = array(
    '#title' => t('Granularity'),
    '#type' => 'select',
    '#options' => array(
      'args' => t('Arguments'),
      'context' => t('Context'),
      'none' => t('None'),
    ),
    '#description' => t('If "arguments" are selected, this content will be cached per individual argument to the entire display; if "contexts" are selected, this content will be cached per unique context in the pane or display; if "neither" there will be only one cache for this pane.'),
    '#default_value' => $conf['granularity'],
  );

  return $form;
}

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