Implement delay to (somewhat) ensure order of processing

Author: mzur

src/Jobs/PostprocessVolumeImport.php

@@ -47,20 +47,26 @@ public function handle()
             ProcessNewVolumeFiles::dispatch($volume);
         });
 
+        // Give the ProcessNewVolumeFiles jobs a head start so the file thumbnails are
+        // generated (mostly) before the annotation thumbnails.
+        $delay = now()->addSeconds(30);
+
         if (class_exists(ProcessAnnotatedImage::class)) {
             Image::whereIn('images.volume_id', $this->ids)
                 ->whereHas('annotations')
-                ->eachById(function ($image) {
+                ->eachById(function ($image) use ($delay) {
                     ProcessAnnotatedImage::dispatch($image)
+                        ->delay($delay)
                         ->onQueue(config('largo.generate_annotation_patch_queue'));
                 }, 1000);
         }
 
         if (class_exists(ProcessAnnotatedVideo::class)) {
             Video::whereIn('videos.volume_id', $this->ids)
                 ->whereHas('annotations')
-                ->eachById(function ($video) {
+                ->eachById(function ($video) use ($delay) {
                     ProcessAnnotatedVideo::dispatch($video)
+                        ->delay($delay)
                         ->onQueue(config('largo.generate_annotation_patch_queue'));
                 }, 1000);
         }