我想知道Python中是否有用于异步方法调用的库。如果你能做点什么就太好了
@async
def longComputation():
<code>
token = longComputation()
token.registerCallback(callback_function)
# alternative, polling
while not token.finished():
doSomethingElse()
if token.finished():
result = token.result()
或者异步调用非异步例程
def longComputation()
<code>
token = asynccall(longComputation())
如果在语言核心中有一个更精细的策略就太好了。考虑过这个问题吗?
您可以使用Python 2.6中添加的多处理模块。您可以使用进程池,然后通过以下方式异步获取结果:
apply_async(func[, args[, kwds[, callback]]])
例如:
from multiprocessing import Pool
def f(x):
return x*x
if __name__ == '__main__':
pool = Pool(processes=1) # Start a worker processes.
result = pool.apply_async(f, [10], callback) # Evaluate "f(10)" asynchronously calling callback when finished.
这只是一种选择。这个模块提供了很多工具来实现你想要的。此外,它将很容易从这做一个装饰。
您可以使用Python 2.6中添加的多处理模块。您可以使用进程池,然后通过以下方式异步获取结果:
apply_async(func[, args[, kwds[, callback]]])
例如:
from multiprocessing import Pool
def f(x):
return x*x
if __name__ == '__main__':
pool = Pool(processes=1) # Start a worker processes.
result = pool.apply_async(f, [10], callback) # Evaluate "f(10)" asynchronously calling callback when finished.
这只是一种选择。这个模块提供了很多工具来实现你想要的。此外,它将很容易从这做一个装饰。
我的解决方案是:
import threading
class TimeoutError(RuntimeError):
pass
class AsyncCall(object):
def __init__(self, fnc, callback = None):
self.Callable = fnc
self.Callback = callback
def __call__(self, *args, **kwargs):
self.Thread = threading.Thread(target = self.run, name = self.Callable.__name__, args = args, kwargs = kwargs)
self.Thread.start()
return self
def wait(self, timeout = None):
self.Thread.join(timeout)
if self.Thread.isAlive():
raise TimeoutError()
else:
return self.Result
def run(self, *args, **kwargs):
self.Result = self.Callable(*args, **kwargs)
if self.Callback:
self.Callback(self.Result)
class AsyncMethod(object):
def __init__(self, fnc, callback=None):
self.Callable = fnc
self.Callback = callback
def __call__(self, *args, **kwargs):
return AsyncCall(self.Callable, self.Callback)(*args, **kwargs)
def Async(fnc = None, callback = None):
if fnc == None:
def AddAsyncCallback(fnc):
return AsyncMethod(fnc, callback)
return AddAsyncCallback
else:
return AsyncMethod(fnc, callback)
并完全按要求工作:
@Async
def fnc():
pass