Refactor: Worker-Pool-Zugriff über öffentliche Getter statt private Modul-Globals

get_saxon_worker_pool() und get_fop_worker_pool() in transform.py hinzugefügt.
worker_pool.py greift nicht mehr direkt auf transform._saxon_worker_pool /
transform._fop_worker_pool zu, sondern verwendet die Getter/Setter konsistent.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ui/mixins/worker_pool.py

@@ -10,7 +10,7 @@ import logging
 from PySide6.QtWidgets import QMessageBox
 
 from conf import app_settings, XsltVersion
-from transform import TransformationJob, set_saxon_worker_pool
+from transform import TransformationJob, get_saxon_worker_pool, set_saxon_worker_pool, get_fop_worker_pool, set_fop_worker_pool
 from saxon_pool import SaxonWorkerPool
 from saxon_pool_s9api import SaxonWorkerPoolS9Api
 
@@ -90,12 +90,10 @@ class WorkerPoolMixin:
     def _shutdown_saxon_worker_pool(self):
         """Beendet den Saxon-Worker-Pool sauber."""
         try:
-            # Importiere transform um Zugriff auf globalen Pool zu haben
-            import transform
-
-            if transform._saxon_worker_pool:
+            pool = get_saxon_worker_pool()
+            if pool:
                 logger.info("Beende Saxon-Worker-Pool...")
-                transform._saxon_worker_pool.shutdown()
+                pool.shutdown()
                 set_saxon_worker_pool(None)
                 logger.info("Saxon-Worker-Pool beendet")
 
@@ -136,7 +134,6 @@ class WorkerPoolMixin:
 
             # Importiere FopWorkerPool
             from fop_pool import FopWorkerPool
-            from transform import set_fop_worker_pool
 
             # Erstelle Worker-Pool
             num_workers = app_settings.max_workers
@@ -165,15 +162,10 @@ class WorkerPoolMixin:
     def _shutdown_fop_worker_pool(self):
         """Beendet den FOP-Worker-Pool sauber."""
         try:
-            # Importiere transform um Zugriff auf globalen Pool zu haben
-            import transform
-
-            if transform._fop_worker_pool:
+            pool = get_fop_worker_pool()
+            if pool:
                 logger.info("Beende FOP-Worker-Pool...")
-                transform._fop_worker_pool.shutdown()
-                # Importiere set_fop_worker_pool
-                from transform import set_fop_worker_pool
-
+                pool.shutdown()
                 set_fop_worker_pool(None)
                 logger.info("FOP-Worker-Pool beendet")