Nathaniel Catchpole has proposed merging
lp:~catch-drupal/pressflow/pressflow_implements into lp:pressflow.
Requested reviews:
Pressflow Administrators (pressflow)
For more details, see:
https://code.launchpad.net/~catch-drupal/pressflow/pressflow_implements/+merge/49769
Backport of Drupal 7 module_implements() caching. Adds one extra change to
path.inc since the return value of $modules is now an associative array instead
of numeric, otherwise identical to the core patch.
On a site with 150 modules instead, this reduced page execution time of
module_implements() from around 4% of the request to less than 1%.
--
https://code.launchpad.net/~catch-drupal/pressflow/pressflow_implements/+merge/49769
Your team Registry Administrators is subscribed to branch lp:pressflow.
=== modified file 'includes/common.inc'
--- includes/common.inc 2010-12-16 19:39:23 +0000
+++ includes/common.inc 2011-02-15 06:34:01 +0000
@@ -1620,6 +1620,8 @@
if ($cache != CACHE_DISABLED && $cache != CACHE_EXTERNAL) {
page_set_cache();
}
+ // Update the hook implementation cache.
+ module_implements('', FALSE, FALSE, TRUE);
module_invoke_all('exit');
}
=== modified file 'includes/module.inc'
--- includes/module.inc 2010-12-16 19:28:18 +0000
+++ includes/module.inc 2011-02-15 06:34:01 +0000
@@ -406,27 +406,78 @@
* @param $sort
* By default, modules are ordered by weight and filename, settings this option
* to TRUE, module list will be ordered by module name.
- * @param $refresh
+ * @param $reset
* For internal use only: Whether to force the stored list of hook
* implementations to be regenerated (such as after enabling a new module,
* before processing hook_enable).
+ * @param $write_cache
+ * For internal use only: Update the persistent cache of hook implementations.
* @return
* An array with the names of the modules which are implementing this hook.
*/
-function module_implements($hook, $sort = FALSE, $refresh = FALSE) {
+function module_implements($hook, $sort = FALSE, $reset = FALSE, $write_cache = FALSE) {
static $implementations;
- if ($refresh) {
+ // We maintain a persistent cache of hook implementations in addition to the
+ // static cache to avoid looping through every module and every hook on each
+ // request. Benchmarks show that the benefit of this caching outweighs the
+ // additional database hit even when using the default database caching
+ // backend and only a small number of modules are enabled. The cost of the
+ // cache_get() is more or less constant and reduced further when non-database
+ // caching backends are used, so there will be more significant gains when a
+ // large number of modules are installed or hooks invoked, since this can
+ // quickly lead to module_hook() being called several thousand times
+ // per request.
+ if ($reset) {
$implementations = array();
- return;
+ cache_set('module_implements', array());
+ return;
+ }
+
+ if ($write_cache) {
+ // Check whether we should write the cache. We do not want to cache hooks
+ // which are only invoked on HTTP POST requests since these do not need to
+ // be optimized as tightly, and not doing so keeps the cache entry smaller.
+ if (isset($implementations['#write_cache']) && ($_SERVER['REQUEST_METHOD'] == 'GET' || $_SERVER['REQUEST_METHOD'] == 'HEAD')) {
+ unset($implementations['#write_cache']);
+ cache_set('module_implements', $implementations);
+ }
+ return;
+ }
+
+ // Fetch implementations from cache.
+ if (empty($implementations)) {
+ $cache = cache_get('module_implements');
+ if (!$cache) {
+ $implementations = array();
+ }
+ else {
+ $implementations = $cache->data;
+ }
}
if (!isset($implementations[$hook])) {
+ // The hook is not cached, so ensure that whether or not it has
+ // implementations, that the cache is updated at the end of the request.
+ $implementations['#write_cache'] = TRUE;
$implementations[$hook] = array();
$list = module_list(FALSE, TRUE, $sort);
foreach ($list as $module) {
if (module_hook($module, $hook)) {
- $implementations[$hook][] = $module;
+ $implementations[$hook][$module] = $module;
+ }
+ }
+ }
+ else {
+ foreach ($implementations[$hook] as $module) {
+ // It is possible that a module removed a hook implementation without the
+ // implementations cache being rebuilt yet, so we check module_hook() on
+ // each request to avoid undefined function errors.
+ if (!module_hook($module, $hook)) {
+ // Clear out the stale implementation from the cache and force a cache
+ // refresh to forget about no longer existing hook implementations.
+ unset($implementations[$hook][$module]);
+ $implementations['#write_cache'] = TRUE;
}
}
}
=== modified file 'includes/path.inc'
--- includes/path.inc 2010-12-16 19:39:23 +0000
+++ includes/path.inc 2011-02-15 06:34:01 +0000
@@ -51,7 +51,7 @@
if (!isset($hook_module)) {
$modules = module_implements('lookup_path');
if (count($modules) > 0) {
- $hook_module = $modules[0];
+ $hook_module = reset($modules);
} else {
$hook_module = FALSE;
}
=== modified file 'install.php'
--- install.php 2010-12-16 19:39:23 +0000
+++ install.php 2011-02-15 06:34:01 +0000
@@ -48,6 +48,18 @@
drupal_load('module', 'system');
drupal_load('module', 'filter');
+ // Load the cache infrastructure using a "fake" cache implementation that
+ // does not attempt to write to the database. We need this during the initial
+ // part of the installer because the database is not available yet. We
+ // continue to use it even when the database does become available, in order
+ // to preserve consistency between interactive and command-line installations
+ // (the latter complete in one page request and therefore are forced to
+ // continue using the cache implementation they started with) and also
+ // because any data put in the cache during the installer is inherently
+ // suspect, due to the fact that Drupal is not fully set up yet.
+ require_once './includes/cache-install.inc';
+ $conf['cache_inc'] = './includes/cache-install.inc';
+
// Install profile chosen, set the global immediately.
// This needs to be done before the theme cache gets
// initialized in drupal_maintenance_theme().
@@ -62,12 +74,6 @@
$verify = install_verify_settings();
if ($verify) {
- // Since we have a database connection, we use the normal cache system.
- // This is important, as the installer calls into the Drupal system for
- // the clean URL checks, so we should maintain the cache properly.
- require_once './includes/cache.inc';
- $conf['cache_inc'] = './includes/cache.inc';
-
// Establish a connection to the database.
require_once './includes/database.inc';
db_set_active();
@@ -79,13 +85,6 @@
}
}
else {
- // Since no persistent storage is available yet, and functions that check
- // for cached data will fail, we temporarily replace the normal cache
- // system with a stubbed-out version that short-circuits the actual
- // caching process and avoids any errors.
- require_once './includes/cache-install.inc';
- $conf['cache_inc'] = './includes/cache-install.inc';
-
$task = NULL;
}
@@ -816,17 +815,14 @@
// The end of the install process. Remember profile used.
if ($task == 'done') {
- // Rebuild menu to get content type links registered by the profile,
- // and possibly any other menu items created through the tasks.
- menu_rebuild();
+ // Flush all caches to ensure that any full bootstraps during the installer
+ // do not leave stale cached data, and that any content types or other items
+ // registered by the install profile are registered correctly.
+ drupal_flush_all_caches();
// Register actions declared by any modules.
actions_synchronize();
- // Randomize query-strings on css/js files, to hide the fact that
- // this is a new install, not upgraded yet.
- _drupal_flush_css_js();
-
variable_set('install_profile', $profile);
}
=== modified file 'update.php'
--- update.php 2010-12-16 19:39:23 +0000
+++ update.php 2011-02-15 06:34:01 +0000
@@ -595,7 +595,7 @@
$op = isset($_REQUEST['op']) ? $_REQUEST['op'] : '';
if (empty($op)) {
// Minimum load of components.
- drupal_bootstrap(DRUPAL_BOOTSTRAP_CONFIGURATION);
+ drupal_bootstrap(DRUPAL_BOOTSTRAP_DATABASE);
require_once './includes/install.inc';
require_once './includes/file.inc';
@@ -606,6 +606,8 @@
$module_list['system']['filename'] = 'modules/system/system.module';
$module_list['filter']['filename'] = 'modules/filter/filter.module';
module_list(TRUE, FALSE, FALSE, $module_list);
+ module_implements('', FALSE, TRUE);
+
drupal_load('module', 'system');
drupal_load('module', 'filter');
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