def main():
try:
client = MongoClient('localhost', 27017)
DataService.init(client)
user_download_history = DataService.retrieve_user_download_history()
all_app_id = DataService.get_all_app_id()
for one_id in all_app_id:
calculate_top_k(one_id, user_download_history.values(), 5)
recommendations = DataService.retrieve_recommended_items()
generate_recommendations(user_download_history, recommendations)
except Exception as e:
print(e)
finally:
if 'client' in locals():
client.close()
