TEXT CACHING

------------

I have a site which really needs this, so I went ahead with it already.

This add-on will cache formatted texts in the database and use them
for a specified timeperiod.

By default it is disabled.   Enable it with:

  $CFG->cachetext = 600;   // in seconds

config-dist.php

@@ -154,6 +154,14 @@ $CFG->admin = 'admin';
 // Prevent scheduled backups from operating (and hide the GUI for them)
 // Useful for webhost operators who have alternate methods of backups
 //      $CFG->disablescheduledbackups = true;
+// 
+// On busy sites that use filters (such as the glossary autolinking) this 
+// may help - it specifies time in seconds to keep copies of formatted texts.
+//      $CFG->cachetext = 600;
+// It has some disadvantages:
+// 1) Texts will take this long to regenerate, so changes to the glossary 
+//    will not be evident immediately.
+// 2) It won't work with filters that use user settings eg: multilang
 
 
 

lib/db/mysql.php

@@ -643,6 +643,17 @@ function main_upgrade($oldversion=0) {
         table_column("course", "", "lang", "varchar", "5", "", "", "", "groupmodeforce");
     }
 
+    if ($oldversion < 2004020902) {
+        modify_database("", "CREATE TABLE `prefix_text_cache` (
+                                `id` int(10) unsigned NOT NULL auto_increment,
+                                `md5key` varchar(32) NOT NULL default '',
+                                `formattedtext` longtext NOT NULL,
+                                `timemodified` int(10) unsigned NOT NULL default '0',
+                                PRIMARY KEY  (`id`),
+                                KEY `md5key` (`md5key`)
+                             ) TYPE=MyISAM COMMENT='For storing temporary copies of processed texts';");
+    }
+
     return $result;
 
 }

lib/db/mysql.sql

@@ -155,6 +155,23 @@ CREATE TABLE `prefix_event` (
   KEY `courseid` (`courseid`),
   KEY `userid` (`userid`)
 ) TYPE=MyISAM COMMENT='For everything with a time associated to it';
+# --------------------------------------------------------
+
+#
+# Table structure for table `text_cache`
+#
+
+CREATE TABLE `prefix_text_cache` (
+  `id` int(10) unsigned NOT NULL auto_increment,
+  `md5key` varchar(32) NOT NULL default '',
+  `formattedtext` longtext NOT NULL,
+  `timemodified` int(10) unsigned NOT NULL default '0',
+  PRIMARY KEY  (`id`),
+  KEY `md5key` (`md5key`)
+) TYPE=MyISAM COMMENT='For storing temporary copies of processed texts';
+# --------------------------------------------------------
+
+
 
 #
 # Table structure for table `group`

lib/db/postgres7.php

@@ -389,6 +389,15 @@ function main_upgrade($oldversion=0) {
         table_column("course", "", "lang", "varchar", "5", "", "", "", "groupmodeforce");
     }
 
+    if ($oldversion < 2004020902) {
+        modify_database("", "CREATE TABLE prefix_text_cache (
+                                id SERIAL PRIMARY KEY,
+                                md5key varchar(32) NOT NULL default '',
+                                formattedtext text,
+                                timemodified integer NOT NULL default '0'
+                             );");
+    }
+
     return $result;
 
 }

lib/db/postgres7.sql

@@ -165,6 +165,13 @@ CREATE TABLE prefix_scale (
    timemodified integer NOT NULL default '0'
 );
 
+CREATE TABLE prefix_text_cache (
+   id SERIAL PRIMARY KEY,
+   md5key varchar(32) NOT NULL default '',
+   formattedtext text,
+   timemodified integer NOT NULL default '0'
+);
+
 CREATE TABLE prefix_user (
    id SERIAL PRIMARY KEY,
    confirmed integer NOT NULL default '0',

version.php

@@ -5,7 +5,7 @@
 // database to determine whether upgrades should
 // be performed (see lib/db/*.php)
 
-$version = 2004020900;   // The current version is a date (YYYYMMDDXX)
+$version = 2004020902;   // The current version is a date (YYYYMMDDXX)
 
 $release = "1.2 development";   // User-friendly version number