refactor(physical-restore): Manage a single instance of filewarmer

Author: tanmoysrt

agent/database_physical_restore.py

@@ -59,6 +59,9 @@ def __init__(
 
     @job("Physical Restore Database")
     def create_restore_job(self):
+        from filewarmer import FWUP
+
+        self.fwup = FWUP()
         self.validate_backup_files()
         self.validate_connection_to_target_db()
         self.warmup_myisam_files()
@@ -324,8 +327,6 @@ def unlock_all_tables(self):
         self._get_target_db_for_myisam().execute_sql("UNLOCK TABLES;")
 
     def _warmup_files(self, file_paths: list[str]):
-        from filewarmer import FWUP
-
         """
         Once the snapshot is converted to disk and attached to the instance,
         All the files are not immediately available to the system.
@@ -338,8 +339,7 @@ def _warmup_files(self, file_paths: list[str]):
         Ref - https://docs.aws.amazon.com/ebs/latest/userguide/ebs-initialize.html
         """
 
-        fwup = FWUP()
-        fwup.warmup(file_paths, method="io_uring")
+        self.fwup.warmup(file_paths, method="io_uring")
 
     def _perform_file_operations(self, engine: str):
         for file in os.listdir(self.backup_db_directory):