more simple downstream queue interface

scrapy/pqueues.py

@@ -52,11 +52,9 @@ class ScrapyPriorityQueue(object):
 
         self.curprio = min(p for p in startprios)
 
-    def qfactory(self, key, startprios=()):
+    def qfactory(self, key):
         return self.downstream_queue_cls(self.crawler,
-                                         None,
-                                         self.key + '/' + str(key),
-                                         startprios)
+                                         self.key + '/' + str(key))
 
     def push(self, request):
         priority = -request.priority

scrapy/squeues.py

@@ -47,7 +47,7 @@ def _scrapy_serialization_queue(queue_class):
 
     class ScrapyRequestQueue(queue_class):
 
-        def __init__(self, crawler, downstream_queue_cls, key, startprios):
+        def __init__(self, crawler, key):
             self.spider = crawler.spider
             super(ScrapyRequestQueue, self).__init__(key)
 
@@ -70,7 +70,7 @@ def _scrapy_serialization_queue(queue_class):
 def _scrapy_in_memory_queue(queue_class):
 
     class ScrapyRequestQueue(queue_class):
-        def __init__(self, crawler, downstream_queue_cls, key, startprios):
+        def __init__(self, crawler, key):
             super(ScrapyRequestQueue, self).__init__()
 
     return ScrapyRequestQueue