nested async yield

nested_async_yield

def asyncsleep(t, callback=None):
    ioloop.add_timeout( time.time() + t, callback )

class NestedYieldAsync(tornado.web.RequestHandler):

    @tornado.web.asynchronous
    @tornado.gen.engine
    def get(self):
        yield gen.Task( self.lots_of_waits )
        yield gen.Task( self.lots_of_waits )
        self.finish()

    @tornado.gen.engine
    def lots_of_waits(self, callback=None):
        for i in range(3):
            print 'sleep',i
            yield gen.Task( asyncsleep, 1 )
        callback()