BUG: Doorman manager child processing fix.

src/Services/ProcessManager.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace Symbiote\QueuedJobs\Services;
+
+use AsyncPHP\Doorman\Manager\ProcessManager as BaseProcessManager;
+
+/**
+ * Class ProcessManager
+ *
+ * customise shell command to allow child tasks to persist even after manager process is terminated
+ * this lets the started jobs to finish properly in case the management process terminates
+ * fore example there are no more jobs to start or queue is paused
+ *
+ * @package Symbiote\QueuedJobs\Services
+ */
+class ProcessManager extends BaseProcessManager
+{
+    /**
+     * @param string $binary
+     * @param string $worker
+     * @param string $stdout
+     * @param string $stderr
+     * @return string
+     */
+    protected function getCommand($binary, $worker, $stdout, $stderr) // phpcs:ignore SlevomatCodingStandard.TypeHints
+    {
+        return sprintf('nohup %s %s %%s %s %s & echo $!', $binary, $worker, $stdout, $stderr);
+    }
+
+    public function __destruct()
+    {
+        // Prevent background tasks from being killed when this script finishes
+        // this is an override for the default behaviour of killing background tasks
+    }
+}

src/Tasks/Engines/DoormanRunner.php

@@ -2,12 +2,12 @@
 
 namespace Symbiote\QueuedJobs\Tasks\Engines;
 
-use AsyncPHP\Doorman\Manager\ProcessManager;
 use SilverStripe\Core\Environment;
 use SilverStripe\Core\Injector\Injector;
 use SilverStripe\ORM\FieldType\DBDatetime;
 use Symbiote\QueuedJobs\DataObjects\QueuedJobDescriptor;
 use Symbiote\QueuedJobs\Jobs\DoormanQueuedJobTask;
+use Symbiote\QueuedJobs\Services\ProcessManager;
 use Symbiote\QueuedJobs\Services\QueuedJob;
 use Symbiote\QueuedJobs\Services\QueuedJobService;