Reorganized render_queue.py

src/render_queue.py

@@ -29,18 +29,37 @@ class RenderQueue:
     maximum_renderer_instances = {'blender': 1, 'aerender': 1, 'ffmpeg': 4}
     last_saved_counts = {}
     is_running = False
-    __eval_thread = None
 
     # --------------------------------------------
-    # Start / Stop Background Updates
+    # Render Queue Evaluation:
     # --------------------------------------------
 
     @classmethod
     def start(cls):
+        """Start evaluating the render queue"""
         logger.debug("Starting render queue updates")
         cls.is_running = True
         cls.evaluate_queue()
 
+    @classmethod
+    def evaluate_queue(cls):
+        try:
+            not_started = cls.jobs_with_status(RenderStatus.NOT_STARTED, priority_sorted=True)
+            for job in not_started:
+                if cls.is_available_for_job(job.renderer, job.priority):
+                    cls.start_job(job)
+
+            scheduled = cls.jobs_with_status(RenderStatus.SCHEDULED, priority_sorted=True)
+            for job in scheduled:
+                if job.scheduled_start <= datetime.now():
+                    logger.debug(f"Starting scheduled job: {job}")
+                    cls.start_job(job)
+
+            if cls.last_saved_counts != cls.job_counts():
+                cls.save_state()
+        except DetachedInstanceError:
+            pass
+
     @classmethod
     def __local_job_status_changed(cls, job_id, old_status, new_status):
         render_job = RenderQueue.job_with_id(job_id, none_ok=True)
@@ -54,20 +73,9 @@ class RenderQueue:
         cls.is_running = False
 
     # --------------------------------------------
-    # Queue Management
+    # Fetch Jobs:
     # --------------------------------------------
 
-    @classmethod
-    def add_to_render_queue(cls, render_job, force_start=False):
-        logger.info(f"Adding job to render queue: {render_job}")
-        cls.job_queue.append(render_job)
-        if cls.is_running and force_start and render_job.status in (RenderStatus.NOT_STARTED, RenderStatus.SCHEDULED):
-            cls.start_job(render_job)
-        cls.session.add(render_job)
-        cls.save_state()
-        if cls.is_running:
-            cls.evaluate_queue()
-
     @classmethod
     def all_jobs(cls):
         return cls.job_queue
@@ -97,12 +105,15 @@ class RenderQueue:
         return found_job
 
     @classmethod
-    def clear_history(cls):
-        to_remove = [x for x in cls.all_jobs() if x.status in [RenderStatus.CANCELLED,
-                                                               RenderStatus.COMPLETED, RenderStatus.ERROR]]
-        for job_to_remove in to_remove:
-            cls.delete_job(job_to_remove)
-        cls.save_state()
+    def job_counts(cls):
+        job_counts = {}
+        for job_status in RenderStatus:
+            job_counts[job_status.value] = len(cls.jobs_with_status(job_status))
+        return job_counts
+
+    # --------------------------------------------
+    # Startup / Shutdown:
+    # --------------------------------------------
 
     @classmethod
     def load_state(cls, database_directory):
@@ -127,6 +138,16 @@ class RenderQueue:
         cls.save_state()
         cls.session.close()
 
+    # --------------------------------------------
+    # Renderer Availability:
+    # --------------------------------------------
+
+    @classmethod
+    def renderer_instances(cls):
+        from collections import Counter
+        all_instances = [x.renderer for x in cls.running_jobs()]
+        return Counter(all_instances)
+
     @classmethod
     def is_available_for_job(cls, renderer, priority=2):
 
@@ -136,24 +157,20 @@ class RenderQueue:
         maxed_out_instances = renderer in instances.keys() and instances[renderer] >= max_allowed_instances
         return not maxed_out_instances and not higher_priority_jobs
 
+    # --------------------------------------------
+    # Job Lifecycle Management:
+    # --------------------------------------------
+
     @classmethod
-    def evaluate_queue(cls):
-        try:
-            not_started = cls.jobs_with_status(RenderStatus.NOT_STARTED, priority_sorted=True)
-            for job in not_started:
-                if cls.is_available_for_job(job.renderer, job.priority):
-                    cls.start_job(job)
-
-            scheduled = cls.jobs_with_status(RenderStatus.SCHEDULED, priority_sorted=True)
-            for job in scheduled:
-                if job.scheduled_start <= datetime.now():
-                    logger.debug(f"Starting scheduled job: {job}")
-                    cls.start_job(job)
-
-            if cls.last_saved_counts != cls.job_counts():
-                cls.save_state()
-        except DetachedInstanceError:
-            pass
+    def add_to_render_queue(cls, render_job, force_start=False):
+        logger.info(f"Adding job to render queue: {render_job}")
+        cls.job_queue.append(render_job)
+        if cls.is_running and force_start and render_job.status in (RenderStatus.NOT_STARTED, RenderStatus.SCHEDULED):
+            cls.start_job(render_job)
+        cls.session.add(render_job)
+        cls.save_state()
+        if cls.is_running:
+            cls.evaluate_queue()
 
     @classmethod
     def start_job(cls, job):
@@ -176,15 +193,14 @@ class RenderQueue:
         cls.save_state()
         return True
 
-    @classmethod
-    def renderer_instances(cls):
-        from collections import Counter
-        all_instances = [x.renderer for x in cls.running_jobs()]
-        return Counter(all_instances)
+    # --------------------------------------------
+    # Miscellaneous:
+    # --------------------------------------------
 
     @classmethod
-    def job_counts(cls):
-        job_counts = {}
-        for job_status in RenderStatus:
-            job_counts[job_status.value] = len(cls.jobs_with_status(job_status))
-        return job_counts
+    def clear_history(cls):
+        to_remove = [x for x in cls.all_jobs() if x.status in [RenderStatus.CANCELLED,
+                                                               RenderStatus.COMPLETED, RenderStatus.ERROR]]
+        for job_to_remove in to_remove:
+            cls.delete_job(job_to_remove)
+        cls.save_state()