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wp-content/plugins/gravitysmtp/includes/routing/class-routing-service-provider.php

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+<?php
+
+namespace Gravity_Forms\Gravity_SMTP\Routing;
+
+use Gravity_Forms\Gravity_SMTP\Connectors\Connector_Service_Provider;
+use Gravity_Forms\Gravity_SMTP\Logging\Logging_Service_Provider;
+use Gravity_Forms\Gravity_SMTP\Routing\Handlers\Primary_Backup_Handler;
+use Gravity_Forms\Gravity_Tools\Service_Container;
+use Gravity_Forms\Gravity_Tools\Service_Provider;
+
+class Routing_Service_Provider extends Service_Provider {
+
+	const PRIMARY_BACKUP_HANDLER = 'primary_backup_handler';
+
+	const HOOK_PRIORITY_PRIMARY_BACKUP = 10;
+
+	public function register( Service_Container $container ) {
+		$container->add( self::PRIMARY_BACKUP_HANDLER, function() use ( $container ) {
+			return new Primary_Backup_Handler( $container->get( Connector_Service_Provider::DATA_STORE_ROUTER ), $container->get( Logging_Service_Provider::DEBUG_LOGGER ) );
+		});
+	}
+
+	public function init( Service_Container $container ) {
+		add_filter( 'gravitysmtp_connector_for_sending', function( $current_connector, $email_args ) use ( $container ) {
+			if ( $current_connector ) {
+				return $current_connector;
+			}
+			return $container->get( self::PRIMARY_BACKUP_HANDLER )->handle( $current_connector, $email_args );
+		}, self::HOOK_PRIORITY_PRIMARY_BACKUP, 2 );
+
+		add_action( 'gravitysmtp_before_email_send', function() use ( $container ) {
+			$container->get( self::PRIMARY_BACKUP_HANDLER )->reset();
+		}, 0 );
+	}
+
+}