FINAL suepr merge step : added all modules to this super repos
This commit is contained in:
Bachir Soussi Chiadmi
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sites/all/libraries/getid3/extension.cache.dbm.php
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222
sites/all/libraries/getid3/extension.cache.dbm.php
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<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <info@getid3.org> //
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// available at http://getid3.sourceforge.net //
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// or http://www.getid3.org //
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/////////////////////////////////////////////////////////////////
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// //
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// extension.cache.dbm.php - part of getID3() //
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// Please see readme.txt for more information //
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// ///
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/////////////////////////////////////////////////////////////////
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// //
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// This extension written by Allan Hansen <ah<61>artemis*dk> //
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// ///
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/////////////////////////////////////////////////////////////////
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/**
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* This is a caching extension for getID3(). It works the exact same
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* way as the getID3 class, but return cached information very fast
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*
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* Example:
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*
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* Normal getID3 usage (example):
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*
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* require_once 'getid3/getid3.php';
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* $getID3 = new getID3;
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* $getID3->encoding = 'UTF-8';
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* $info1 = $getID3->analyze('file1.flac');
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* $info2 = $getID3->analyze('file2.wv');
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*
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* getID3_cached usage:
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*
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* require_once 'getid3/getid3.php';
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* require_once 'getid3/getid3/extension.cache.dbm.php';
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* $getID3 = new getID3_cached('db3', '/tmp/getid3_cache.dbm',
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* '/tmp/getid3_cache.lock');
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* $getID3->encoding = 'UTF-8';
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* $info1 = $getID3->analyze('file1.flac');
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* $info2 = $getID3->analyze('file2.wv');
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*
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*
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* Supported Cache Types
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*
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* SQL Databases: (use extension.cache.mysql)
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*
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* cache_type cache_options
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* -------------------------------------------------------------------
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* mysql host, database, username, password
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*
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*
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* DBM-Style Databases: (this extension)
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*
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* cache_type cache_options
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* -------------------------------------------------------------------
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* gdbm dbm_filename, lock_filename
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* ndbm dbm_filename, lock_filename
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* db2 dbm_filename, lock_filename
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* db3 dbm_filename, lock_filename
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* db4 dbm_filename, lock_filename (PHP5 required)
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*
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* PHP must have write access to both dbm_filename and lock_filename.
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*
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*
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* Recommended Cache Types
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*
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* Infrequent updates, many reads any DBM
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* Frequent updates mysql
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*/
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class getID3_cached_dbm extends getID3
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{
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// public: constructor - see top of this file for cache type and cache_options
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function getID3_cached_dbm($cache_type, $dbm_filename, $lock_filename) {
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// Check for dba extension
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if (!extension_loaded('dba')) {
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die('PHP is not compiled with dba support, required to use DBM style cache.');
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}
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// Check for specific dba driver
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if (function_exists('dba_handlers')) { // PHP 4.3.0+
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if (!in_array('db3', dba_handlers())) {
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die('PHP is not compiled --with '.$cache_type.' support, required to use DBM style cache.');
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}
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}
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else { // PHP <= 4.2.3
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ob_start(); // nasty, buy the only way to check...
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phpinfo();
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$contents = ob_get_contents();
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ob_end_clean();
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if (!strstr($contents, $cache_type)) {
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die('PHP is not compiled --with '.$cache_type.' support, required to use DBM style cache.');
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}
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}
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// Create lock file if needed
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if (!file_exists($lock_filename)) {
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if (!touch($lock_filename)) {
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die('failed to create lock file: ' . $lock_filename);
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}
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}
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// Open lock file for writing
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if (!is_writeable($lock_filename)) {
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die('lock file: ' . $lock_filename . ' is not writable');
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}
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$this->lock = fopen($lock_filename, 'w');
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// Acquire exclusive write lock to lock file
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flock($this->lock, LOCK_EX);
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// Create dbm-file if needed
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if (!file_exists($dbm_filename)) {
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if (!touch($dbm_filename)) {
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die('failed to create dbm file: ' . $dbm_filename);
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}
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}
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// Try to open dbm file for writing
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$this->dba = @dba_open($dbm_filename, 'w', $cache_type);
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if (!$this->dba) {
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// Failed - create new dbm file
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$this->dba = dba_open($dbm_filename, 'n', $cache_type);
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if (!$this->dba) {
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die('failed to create dbm file: ' . $dbm_filename);
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}
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// Insert getID3 version number
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dba_insert(GETID3_VERSION, GETID3_VERSION, $this->dba);
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}
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// Init misc values
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$this->cache_type = $cache_type;
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$this->dbm_filename = $dbm_filename;
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// Register destructor
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register_shutdown_function(array($this, '__destruct'));
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// Check version number and clear cache if changed
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if (dba_fetch(GETID3_VERSION, $this->dba) != GETID3_VERSION) {
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$this->clear_cache();
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}
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parent::getID3();
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}
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// public: destuctor
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function __destruct() {
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// Close dbm file
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@dba_close($this->dba);
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// Release exclusive lock
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@flock($this->lock, LOCK_UN);
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// Close lock file
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@fclose($this->lock);
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}
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// public: clear cache
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function clear_cache() {
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// Close dbm file
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dba_close($this->dba);
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// Create new dbm file
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$this->dba = dba_open($this->dbm_filename, 'n', $this->cache_type);
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if (!$this->dba) {
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die('failed to clear cache/recreate dbm file: ' . $this->dbm_filename);
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}
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// Insert getID3 version number
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dba_insert(GETID3_VERSION, GETID3_VERSION, $this->dba);
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// Reregister shutdown function
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register_shutdown_function(array($this, '__destruct'));
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}
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// public: analyze file
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function analyze($filename) {
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if (file_exists($filename)) {
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// Calc key filename::mod_time::size - should be unique
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$key = $filename . '::' . filemtime($filename) . '::' . filesize($filename);
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// Loopup key
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$result = dba_fetch($key, $this->dba);
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// Hit
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if ($result !== false) {
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return unserialize($result);
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}
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}
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// Miss
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$result = parent::analyze($filename);
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// Save result
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if (file_exists($filename)) {
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dba_insert($key, serialize($result), $this->dba);
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}
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return $result;
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}
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}
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?>
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