close method for api

parsl/dataflow/dflow.py

@@ -1260,6 +1260,7 @@ def cleanup(self) -> None:
 
         self.log_task_states()
 
+        # TODO: do this in the basic memoizer
         # Checkpointing takes priority over the rest of the tasks
         # checkpoint if any valid checkpoint method is specified
         if self.checkpoint_mode is not None:
@@ -1272,6 +1273,10 @@ def cleanup(self) -> None:
                 logger.info("Stopping checkpoint timer")
                 self._checkpoint_timer.close()
 
+        logger.info("Closing memoizer")
+        self.memoizer.close()
+        logger.info("Closed memoizer")
+
         # Send final stats
         logger.info("Sending end message for usage tracking")
         self.usage_tracker.send_end_message()

parsl/dataflow/memoization.py

@@ -161,6 +161,9 @@ class Memoizer:
     def start(self, *, dfk: DataFlowKernel, memoize: bool = True, checkpoint_files: Sequence[str], run_dir: str) -> None:
         raise NotImplementedError
 
+    def close(self) -> None:
+        raise NotImplementedError
+
     def update_memo(self, task: TaskRecord, r: Future[Any]) -> None:
         raise NotImplementedError
 
@@ -236,6 +239,9 @@ def start(self, *, dfk: DataFlowKernel, memoize: bool = True, checkpoint_files:
             logger.info("App caching disabled for all apps")
             self.memo_lookup_table = {}
 
+    def close(self) -> None:
+        pass   # nothing to close but more should move here
+
     def check_memo(self, task: TaskRecord) -> Optional[Future[Any]]:
         """Create a hash of the task and its inputs and check the lookup table for this hash.