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CPU Upgrade
File size: 2,782 Bytes
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# Copyright 2025 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
import threading
logger = logging.getLogger(__name__)
class BackgroundTaskManager:
"""A simple manager to run and track background initialization tasks."""
def __init__(self):
self.tasks = {}
self.results = {}
self.errors = {}
self._lock = threading.Lock()
def _task_wrapper(self, key, target_func, *args, **kwargs):
"""A wrapper to run the target function and store its result or exception."""
logger.info(f"Background task '{key}' started.")
try:
result = target_func(*args, **kwargs)
with self._lock:
self.results[key] = result
logger.info(f"✅ Background task '{key}' finished successfully.")
except Exception as e:
with self._lock:
self.errors[key] = e
logger.critical(f"❌ Background task '{key}' failed with an exception.", exc_info=True)
def start_task(self, key, target_func, *args, **kwargs):
"""Starts a new background task in a daemon thread."""
if key in self.tasks:
logger.warning(f"Task '{key}' is already running.")
return
thread = threading.Thread(
target=self._task_wrapper,
args=(key, target_func) + args,
kwargs=kwargs,
daemon=True # Daemon threads exit when the main app exits
)
with self._lock:
self.tasks[key] = thread
thread.start()
def is_task_running(self, key):
"""Checks if a specific task is still active."""
with self._lock:
return self.tasks.get(key) and self.tasks[key].is_alive()
def is_task_done(self, key):
"""Checks if a task has completed (successfully or with an error)."""
with self._lock:
result = key in self.results or key in self.errors
if not result:
logger.info(f"self.results: {self.results}")
logger.info(f"self.errors: {self.errors}")
return result
def get_error(self, key):
"""Returns the exception for a failed task, if any."""
with self._lock:
return self.errors.get(key)
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