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توضیحات

Callback-less python async calls dispatcher

ویژگی	مقدار
سیستم عامل	-
نام فایل	adisp-0.0.3
نام	adisp
نسخه کتابخانه	0.0.3
نگهدارنده	[]
ایمیل نگهدارنده	[]
نویسنده	Ivan Sagalaev
ایمیل نویسنده	maniac@softwaremaniacs.org
آدرس صفحه اصلی	https://code.launchpad.net/~isagalaev/adisp/trunk
آدرس اینترنتی	https://pypi.org/project/adisp/
مجوز	UNKNOWN

Adisp is a library that allows structuring code with asynchronous calls and callbacks without defining callbacks as separate functions. The code then becomes sequential and easy to read. The library is not a framework by itself and can be used in other environments that provides asynchronous working model (see an example with Tornado server in proxy_example.py). Usage: ## Organizing calling code All the magic is done with Python 2.5 decorators that allow for control flow to leave a function, do sometihing else for some time and then return into the calling function with a result. So the function that makes asynchronous calls should look like this: @process def my_handler(): response = yield some_async_func() data = parse_response(response) result = yield some_other_async_func(data) store_result(result) Each `yield` is where the function returns and lets the framework around it to do its job. And the code after `yield` is what usually goes in a callback. The @process decorator is needed around such a function. It makes it callable as an ordinary function and takes care of dispatching callback calls back into it. ## Writing asynchronous function In the example above functions "some_async_func" and "some_other_async_func" are those that actually run an asynchronous process. They should follow two conditions: - accept a "callback" parameter with a callback function that they should call after an asynchronous process is finished - a callback should be called with one parameter -- the result - be wrapped in the @async decorator The @async decorator makes a function call lazy allowing the @process that calls it to provide a callback to call. Using async with @-syntax is most convenient when you write your own asynchronous function (and can make your callback parameter to be named "callback"). But when you want to call some library function you can wrap it in async in place. # call http.fetch(url, callback=callback) result = yield async(http.fetch) # call http.fetch(url, cb=safewrap(callback)) result = yield async(http.fetch, cbname='cb', cbwrapper=safewrap)(url) Here you can use two optional parameters for async: - `cbname`: a name of a parameter in which the function expects callbacks - `cbwrapper`: a wrapper for the callback iself that will be applied before calling it ## Chain calls @async function can also be @process'es allowing to effectively chain asynchronous calls as it can be done with normal functions. In this case the @async decorator shuold be the outer one: @async @process def async_calling_other_asyncs(arg, callback): # .... ## Multiple asynchronous calls The library also allows to call multiple asynchronous functions in parallel and get all their result for processing at once: @async def async_http_get(url, callback): # get url asynchronously # call callback(response) at the end @process def get_stat(): urls = ['http://.../', 'http://.../', ... ] responses = yield map(async_http_get, urls) After *all* the asynchronous calls will complete `responses` will be a list of responses corresponding to given urls.

نحوه نصب

نصب پکیج whl adisp-0.0.3:

pip install adisp-0.0.3.whl

نصب پکیج tar.gz adisp-0.0.3:

pip install adisp-0.0.3.tar.gz