<?php
namespace W3TC;
/**
* class Db
* Database access mediator
*/
class DbCache_Wpdb extends DbCache_WpdbBase {
/**
* Returns object instance. Called by WP engine
*
* @return DbCache_Wpdb
*/
static function instance() {
static $instance = null;
if ( is_null( $instance ) ) {
$processors = array();
$call_default_constructor = true;
// no caching during activation
$is_installing = ( defined( 'WP_INSTALLING' ) && WP_INSTALLING );
$config = Dispatcher::config();
if ( !$is_installing && $config->get_boolean( 'dbcache.enabled' ) ) {
$processors[] = new DbCache_WpdbInjection_QueryCaching();
}
if ( Util_Environment::is_dbcluster() ) {
$processors[] = new Enterprise_Dbcache_WpdbInjection_Cluster();
}
$processors[] = new DbCache_WpdbInjection();
$class = __CLASS__;
$o = new $class( $processors );
$next_injection = new _CallUnderlying( $o );
foreach ( $processors as $processor ) {
$processor->initialize_injection( $o, $next_injection );
}
// initialize after processors configured
$o->initialize();
$instance = $o;
}
return $instance;
}
private $processor_number;
private $active_processor;
private $active_processors;
private $debug;
private $request_time_start = 0;
/*
* @param boolean $call_default_constructor
*/
public function __construct( $processors = null ) {
// cant force empty parameter list due to wp requirements
if ( !is_array( $processors ) )
throw new Exception( 'called incorrectly, use instance()' );
$this->processors = $processors;
$this->active_processor = $processors[0];
$this->active_processor_number = 0;
$c = Dispatcher::config();
$this->debug = $c->get_boolean( 'dbcache.debug' );
if ( $this->debug )
$this->_request_time_start = microtime( true );
}
/**
* Called by Root_Loader when all w3tc plugins loaded,
* i.e. later that object instantiated
*/
function on_w3tc_plugins_loaded() {
$o = $this;
if ( $this->debug ) {
add_action( 'shutdown', array( $o, 'debug_shutdown' ) );
}
add_filter( 'w3tc_footer_comment', array(
$o, 'w3tc_footer_comment' ) );
add_action( 'w3tc_usage_statistics_of_request', array(
$o, 'w3tc_usage_statistics_of_request' ), 10, 1 );
}
function w3tc_footer_comment( $strings ) {
foreach ( $this->processors as $processor )
$strings = $processor->w3tc_footer_comment( $strings );
return $strings;
}
function debug_shutdown() {
$strings = array();
foreach ( $this->processors as $processor )
$strings = $processor->w3tc_footer_comment( $strings );
$request_time_total = microtime( true ) - $this->request_time_start;
$data = sprintf( "\n[%s] [%s] [%s]\n", date( 'r' ),
$_SERVER['REQUEST_URI'], round( $request_time_total, 4 ) ) .
implode( "\n", $strings ) . "\n";
$data = strtr( $data, '<>', '..' );
$filename = Util_Debug::log_filename( 'dbcache' );
@file_put_contents( $filename, $data, FILE_APPEND );
}
function w3tc_usage_statistics_of_request( $storage ) {
foreach ( $this->processors as $processor )
$processor->w3tc_usage_statistics_of_request( $storage );
}
function flush_cache() {
$v = true;
foreach ( $this->processors as $processor )
$v &= $processor->flush_cache();
return $v;
}
/**
* Initializes object after processors configured. Called from instance() only
*/
function initialize() {
return $this->active_processor->initialize();
}
/**
* Overriten logic of wp_db by processor.
*/
function insert( $table, $data, $format = null ) {
do_action( 'w3tc_db_insert', $table, $data, $format );
return $this->active_processor->insert( $table, $data, $format );
}
/**
* Overriten logic of wp_db by processor.
*/
function query( $query ) {
return $this->active_processor->query( $query );
}
/**
* Overriten logic of wp_db by processor.
*/
function replace( $table, $data, $format = null ) {
do_action( 'w3tc_db_replace', $table, $data, $format );
return $this->active_processor->replace( $table, $data, $format );
}
/**
* Overriten logic of wp_db by processor.
*/
function update( $table, $data, $where, $format = null, $where_format = null ) {
do_action( 'w3tc_db_update', $table, $data, $where, $format,
$where_format );
return $this->active_processor->update( $table, $data, $where, $format, $where_format );
}
/**
* Overriten logic of wp_db by processor.
*/
function delete( $table, $where, $where_format = null ) {
do_action( 'w3tc_db_delete', $table, $where, $where_format );
return $this->active_processor->delete( $table, $where, $where_format );
}
/**
* Overriten logic of wp_db by processor.
*/
function init_charset() {
return $this->active_processor->init_charset();
}
/**
* Overriten logic of wp_db by processor.
*/
function set_charset( $dbh, $charset = null, $collate = null ) {
return $this->active_processor->set_charset( $dbh, $charset, $collate );
}
/**
* Overriten logic of wp_db by processor.
*/
function flush() {
return $this->active_processor->flush();
}
/**
* Overriten logic of wp_db by processor.
*/
function check_database_version( $dbh_or_table = false ) {
return $this->active_processor->check_database_version( $dbh_or_table );
}
/**
* Overriten logic of wp_db by processor.
*/
function supports_collation( $dbh_or_table = false ) {
return $this->active_processor->supports_collation( $dbh_or_table );
}
/**
* Overriten logic of wp_db by processor.
*/
function has_cap( $db_cap, $dbh_or_table = false ) {
return $this->active_processor->has_cap( $db_cap, $dbh_or_table );
}
/**
* Overriten logic of wp_db by processor.
*/
function db_version( $dbh_or_table = false ) {
return $this->active_processor->db_version( $dbh_or_table );
}
/**
* Default initialization method, calls wp_db apropriate method
*/
function default_initialize() {
parent::__construct( DB_USER, DB_PASSWORD, DB_NAME, DB_HOST );
}
/**
* Default implementation, calls wp_db apropriate method
*/
function default_insert( $table, $data, $format = null ) {
return parent::insert( $table, $data, $format );
}
/**
* Default implementation, calls wp_db apropriate method
*/
function default_query( $query ) {
return parent::query( $query );
}
/**
* Default implementation, calls wp_db apropriate method
*/
function default_replace( $table, $data, $format = null ) {
return parent::replace( $table, $data, $format );
}
/**
* Default implementation, calls wp_db apropriate method
*/
function default_update( $table, $data, $where, $format = null, $where_format = null ) {
return parent::update( $table, $data, $where, $format, $where_format );
}
/**
* Default implementation, calls wp_db apropriate method
*/
function default_delete( $table, $where, $where_format = null ) {
return parent::delete( $table, $where, $where_format );
}
/**
* Default implementation, calls wp_db apropriate method
*/
function default_init_charset() {
return parent::init_charset();
}
/**
* Default implementation, calls wp_db apropriate method
*/
function default_set_charset( $dbh, $charset = null, $collate = null ) {
return parent::set_charset( $dbh, $charset, $collate );
}
/**
* Default implementation, calls wp_db apropriate method
*/
function default_flush() {
return parent::flush();
}
/**
* Default implementation, calls wp_db apropriate method
*/
function default_check_database_version( $dbh_or_table = false ) {
return parent::check_database_version( $dbh_or_table );
}
/**
* Default implementation, calls wp_db apropriate method
*/
function default_supports_collation( $dbh_or_table = false ) {
return parent::supports_collation( $dbh_or_table );
}
/**
* Default implementation, calls wp_db apropriate method
*/
function default_has_cap( $db_cap, $dbh_or_table = false ) {
return parent::has_cap( $db_cap, $dbh_or_table );
}
/**
* Default implementation, calls wp_db apropriate method
*/
function default_db_version( $dbh_or_table = false ) {
return parent::db_version( $dbh_or_table );
}
/**
* Default implementation, calls wp_db apropriate method
*/
function switch_active_processor( $offset ) {
$new_processor_number = $this->active_processor_number + $offset;
if ( $new_processor_number <= 0 ) {
$new_processor_number = 0;
} else if ( $new_processor_number >= count( $this->processors ) ) {
$new_processor_number = count( $this->processors ) - 1;
}
$offset_made = $new_processor_number - $this->active_processor_number;
$this->active_processor_number = $new_processor_number;
$this->active_processor = $this->processors[$new_processor_number];
return $offset_made;
}
}
/**
* class CallUnderlying
*/
class _CallUnderlying {
function __construct( $manager ) {
$this->wpdb_mixin = $manager;
}
/**
* Calls underlying processor's aproptiate method of wp_db
*/
function initialize() {
$switched = $this->wpdb_mixin->switch_active_processor( 1 );
try {
$r = $this->wpdb_mixin->initialize();
$this->wpdb_mixin->switch_active_processor( -$switched );
return $r;
} catch ( \Exception $e ) {
$this->wpdb_mixin->switch_active_processor( -$switched );
throw $e;
}
}
/**
* Calls underlying processor's aproptiate method of wp_db
*/
function flush() {
$switched = $this->wpdb_mixin->switch_active_processor( 1 );
try {
$r = $this->wpdb_mixin->flush();
$this->wpdb_mixin->switch_active_processor( -$switched );
return $r;
} catch ( \Exception $e ) {
$this->wpdb_mixin->switch_active_processor( -$switched );
throw $e;
}
}
/**
* Calls underlying processor's aproptiate method of wp_db
*/
function query( $query ) {
$switched = $this->wpdb_mixin->switch_active_processor( 1 );
try {
$r = $this->wpdb_mixin->query( $query );
$this->wpdb_mixin->switch_active_processor( -$switched );
return $r;
} catch ( \Exception $e ) {
$this->wpdb_mixin->switch_active_processor( -$switched );
throw $e;
}
}
/**
* Calls underlying processor's aproptiate method of wp_db
*/
function insert( $table, $data, $format = null ) {
$switched = $this->wpdb_mixin->switch_active_processor( 1 );
try {
$r = $this->wpdb_mixin->insert( $table, $data, $format );
$this->wpdb_mixin->switch_active_processor( -$switched );
return $r;
} catch ( \Exception $e ) {
$this->wpdb_mixin->switch_active_processor( -$switched );
throw $e;
}
}
/**
* Calls underlying processor's aproptiate method of wp_db
*/
function replace( $table, $data, $format = null ) {
$switched = $this->wpdb_mixin->switch_active_processor( 1 );
try {
$r = $this->wpdb_mixin->replace( $table, $data, $format );
$this->wpdb_mixin->switch_active_processor( -$switched );
return $r;
} catch ( \Exception $e ) {
$this->wpdb_mixin->switch_active_processor( -$switched );
throw $e;
}
}
/**
* Calls underlying processor's aproptiate method of wp_db
*/
function update( $table, $data, $where, $format = null, $where_format = null ) {
$switched = $this->wpdb_mixin->switch_active_processor( 1 );
try {
$r = $this->wpdb_mixin->update( $table, $data, $where, $format, $where_format );
$this->wpdb_mixin->switch_active_processor( -$switched );
return $r;
} catch ( \Exception $e ) {
$this->wpdb_mixin->switch_active_processor( -$switched );
throw $e;
}
}
function delete( $table, $where, $where_format = null ) {
$switched = $this->wpdb_mixin->switch_active_processor( 1 );
try {
$r = $this->wpdb_mixin->delete( $table, $where, $where_format );
$this->wpdb_mixin->switch_active_processor( -$switched );
return $r;
} catch ( \Exception $e ) {
$this->wpdb_mixin->switch_active_processor( -$switched );
throw $e;
}
}
}