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<?php
namespace W3TC;
class UsageStatistics_Core {
private $shutdown_handler_added = false;
private $storage;
private $hotspot_flushing_state_on_exit_attempt = null;
public function __construct() {
$this->storage = new UsageStatistics_StorageWriter();
}
public function add_shutdown_handler() {
$this->shutdown_handler_added = true;
add_action( 'shutdown', array(
$this,
'shutdown'
), 100000, 0 );
if ( !is_null( $this->hotspot_flushing_state_on_exit_attempt ) )
add_action( 'init', array(
$this, 'init_when_exit_requested' ) );
}
public function is_shutdown_handler_added() {
return $this->shutdown_handler_added;
}
public function init_when_exit_requested() {
exit();
}
public function shutdown() {
if ( !is_null( $this->hotspot_flushing_state_on_exit_attempt ) )
$this->storage->finish_flush_hotspot_data();
else
$this->storage->maybe_flush_hotspot_data();
do_action( 'w3tc_usage_statistics_of_request', $this->storage );
}
/**
* $metrics_function has to be added by add_action on plugin load
*/
public function apply_metrics_before_init_and_exit( $metrics_function ) {
// plugin already loaded, metrics will be added normal way
// by shutdown
if ( $this->shutdown_handler_added ) {
return;
}
$this->hotspot_flushing_state_on_exit_attempt =
$this->storage->begin_flush_hotspot_data();
// flush wants to happen in that process, need to pass through whole
// wp request processing further
if ( $this->hotspot_flushing_state_on_exit_attempt != 'not_needed' ) {
return;
}
call_user_func( $metrics_function, $this->storage );
exit();
}
}