我想编写一个在后台处理请求的Web服务。该服务将请求放入队列中并立即响应客户端。
我在下面的代码中的问题是 while 循环在 BackgroundThread().run() 函数中不起作用。
而 BackgroundThread.run() 方法中的循环不像无限。它只进入 while 循环一次。
谢谢。
法典:
class BackgroundThread(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
def run(self):
global queue
while True:
item = queue.get()
if item is not None:
#long running process
time.sleep(random.randint(10, 100) / 1000.0)
print "task", item, "finished"
queue = Queue.Queue()
class MyHandler(tornado.web.RequestHandler):
@gen.coroutine
def get(self):
global queue
self.write('OK')
self.finish()
filePath = self.get_arguments("filePath")
queue.put(filePath)
print queue.qsize()
if __name__=='__main__':
try:
BackgroundThread().start()
BackgroundThread().start()
app = tornado.web.Application([(r'/', MyHandler)])
print("server opened on port : 8000")
server = tornado.httpserver.HTTPServer(app)
server.bind(8000)
server.start(4) # Specify number of subprocesses
tornado.ioloop.IOLoop.current().start()
except KeyboardInterrupt:
print '^C received, shutting down the web server'
sys.exit(1)
我只是添加 try except 块,因为当队列在 while 循环中为空时,它会得到异常并且不会迭代。
我得到了答案,这是代码:
class BackgroundThread(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
def run(self):
global queue
print("qwerqwer0")
while 1==1:
print("qwerqwer1")
print("qwerqwer2")
try:
item = queue.get()
queue.task_done()
except Queue.Empty:
print("empty")
pass
if item is not None:
print("qwerqwerqwer")
#long running process
print "task ", item, " finished"
queue = Queue.Queue()
class MyHandler(tornado.web.RequestHandler):
@gen.coroutine
def get(self):
global queue
self.write('OK')
self.finish()
filePath = self.get_arguments("filePath")
queue.put(filePath)
print queue.qsize()
if __name__=='__main__':
try:
#BackgroundThread().start()
BackgroundThread().start()
app = tornado.web.Application([(r'/', MyHandler)])
print("server opened on port : 8000")
server = tornado.httpserver.HTTPServer(app)
server.bind(8000)
server.start(4) # Specify number of subprocesses
tornado.ioloop.IOLoop.current().start()
except KeyboardInterrupt:
print '^C received, shutting down the web server'
sys.exit(1)