<?php
if (!defined('ABSPATH')) exit;
class ActionScheduler_FatalErrorMonitor {
 private $claim = NULL;
 private $store = NULL;
 private $action_id = 0;
 public function __construct( ActionScheduler_Store $store ) {
 $this->store = $store;
 }
 public function attach( ActionScheduler_ActionClaim $claim ) {
 $this->claim = $claim;
 add_action( 'shutdown', array( $this, 'handle_unexpected_shutdown' ) );
 add_action( 'action_scheduler_before_execute', array( $this, 'track_current_action' ), 0, 1 );
 add_action( 'action_scheduler_after_execute', array( $this, 'untrack_action' ), 0, 0 );
 add_action( 'action_scheduler_execution_ignored', array( $this, 'untrack_action' ), 0, 0 );
 add_action( 'action_scheduler_failed_execution', array( $this, 'untrack_action' ), 0, 0 );
 }
 public function detach() {
 $this->claim = NULL;
 $this->untrack_action();
 remove_action( 'shutdown', array( $this, 'handle_unexpected_shutdown' ) );
 remove_action( 'action_scheduler_before_execute', array( $this, 'track_current_action' ), 0 );
 remove_action( 'action_scheduler_after_execute', array( $this, 'untrack_action' ), 0 );
 remove_action( 'action_scheduler_execution_ignored', array( $this, 'untrack_action' ), 0 );
 remove_action( 'action_scheduler_failed_execution', array( $this, 'untrack_action' ), 0 );
 }
 public function track_current_action( $action_id ) {
 $this->action_id = $action_id;
 }
 public function untrack_action() {
 $this->action_id = 0;
 }
 public function handle_unexpected_shutdown() {
 if ( $error = error_get_last() ) {
 if ( in_array( $error['type'], array( E_ERROR, E_PARSE, E_COMPILE_ERROR, E_USER_ERROR, E_RECOVERABLE_ERROR ) ) ) {
 if ( !empty($this->action_id) ) {
 $this->store->mark_failure( $this->action_id );
 do_action( 'action_scheduler_unexpected_shutdown', $this->action_id, $error );
 }
 }
 $this->store->release_claim( $this->claim );
 }
 }
}