django-dumbwaiter Asynchronous function execution with cached results
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Asynchronous function execution function execution cached results

django-dumbwaiter Description

Asynchronous function execution with cached results Optimizing expensive queries and calculations in web applications is a complex and tedious problem. django-dumbwaiter is designed to enable simple caching of data while relieving the dogpile effect.Numerous functions can be run in the background on a periodic basis, and will persist the results of their evaluation to the database.How to use dumbwaiterThe easiest way to get started with dumbwaiter is to add `dumbwaiter` to the INSTALLED_APPS list in your `settings.py` and to add a setting called `DUMBWAITER_FUNCTION_LIST` that conforms to the following standard::: DUMBWAITER_FUNCTION_LIST = Each member of the function list can contain the following attributes:function: An actual function or a string containing the path by which a function can be accessed.name: The name by which the function will be referenced. This name must be unique.frequency: The number of seconds between invocations of `function`. Defaults to 'DUMBWAITER_DEFAULT_FREQUENCY`.args: The arguments to be passed to `function`. Defaults to an empty list.kwargs: The keyword arguments to be passed to `function`. Defaults to an empty dict.max_saved: The depth of the history of cached data. This data is not accessible through the standard API, and currently only applied when using the database storage backend. Defaults to `DUMBWAITER_DEFAULT_SAVED`.After the function list has been established the `run_dumbwaiter` management command will run the specified functions at the specified intervals.:: ./manage.py run_dumbwaiterOnce the run_dumbwaiter management command is started, it will begin to record the values for each function. It is possible to retrieve the most recent value through the use of `get_value`::: import dumbwaiter my_value = dumbwaiter.get_value("count")Additional settingsThere are several additional settings that may be customized.DUMBWAITER_SERIALIZER: The name of a module containing the serializer to be used to store the value returned by functions in the function list. The serializer must be named `serializer` in the module specified. It must additionally support the `serialize` and `deserialize` methods. The default serializer lives in `dumbwaiter.serializers.pickler`.DUMBWAITER_THREADED: The Dumbwaiter can run in threaded and non-threaded modes. The primary advantage of threaded operation is that functions do not block one another. The default is True.DUMBWAITER_DEFAULT_SAVED: The default depth of the history of cached data. Defaults to 10.DUMBWAITER_DEFAULT_FREQUENCY: The default number of seconds between invocation of functions. Defaults to five minutes.PICKLE_PROTOCOL: If using the `dumbwaiter.serializers.pickler` serializer, this specifies the version of the pickle protocol that will be used. Requirements: · Python · Django

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