tornado 的 coroutine 能和自定义的装饰器一起使用吗?? - V2EX
triThirty

tornado 的 coroutine 能和自定义的装饰器一起使用吗??

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  •   triThirty Apr 7, 2016 11403 views
    This topic created in 3688 days ago, the information mentioned may be changed or developed.

    试了下使用 tornado 的 coroutine 和自已定义的一个 decorator 一起使用,但发现不会在 yield 出挂起,而是向上返回。 就是说,如果有多层嵌套的话,在运行到最底层的 yield 处之后,程序不会运行 yield 之后的代码,而是向上返回一个空的 future ,而且上层代码也不会执行 yield 之后的代码而是继续向上返回。 不知道有没有大神能给出一个例子,将 coroutine 和自定义的装饰器一起使用的例子,或者说能指出怎么使用。谢谢

    3 replies    2016-04-12 10:17:53 +08:00
    calease
        1
    calease  
       Apr 7, 2016
    decorator 只不过是把原先的 function 替换成 wrapper ,唯一要注意的就是你的 decorator 最好放在上面,并且自己也要是 coroutine 。比如:

    def sleeper(func):
    @coroutine
    def wrapper(*args, **kwargs):
    yield tornado.gen.sleep(1)
    # here func is actually a get wrapped by coroutine, so yield it
    yield func(*args, **kwargs)
    return wrapper

    @sleeper
    @coroutine
    def get(*args, **kwargs):
    # code goes here
    self.write("just get it")


    放下面的情况比较复杂一时说不完,且听下回分解。
    triThirty
        2
    triThirty  
    OP
       Apr 7, 2016
    @calease 感谢大神~~~~~
    wingyiu
        3
    div class="sep3"> wingyiu  
       Apr 12, 2016
    @calease
    import
    inspect.isgeneratorfunction(foo)

    如果是就 yield 咯 不是就随意咯
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