remove `default` parameter from max_value/min_value stats methods, update docs, and add new methods to dummy collector

docs/topics/stats.rst

@@ -50,11 +50,11 @@ Increment global stat value::
 
 Set global stat value only if greater than previous::
 
-    stats.max_value('max_items_scraped', value, default=0)
+    stats.max_value('max_items_scraped', value)
 
 Set global stat value only if lower than previous::
 
-    stats.min_value('min_free_memory_percent', value, default=100)
+    stats.min_value('min_free_memory_percent', value)
 
 Get global stat value::
 
@@ -78,11 +78,11 @@ Increment domain-specific stat value::
 
 Set domain-specific stat value only if greater than previous::
 
-    stats.max_value('max_items_scraped', value, default=0, domain='example.com')
+    stats.max_value('max_items_scraped', value, domain='example.com')
 
 Set domain-specific stat value only if lower than previous::
 
-    stats.min_value('min_free_memory_percent', value, default=100, domain='example.com')
+    stats.min_value('min_free_memory_percent', value, domain='example.com')
 
 Get domain-specific stat value::
 
@@ -116,12 +116,6 @@ class (which they all inherit from).
         domain specific one is. If the domain is not yet opened a ``KeyError``
         exception is raised.
 
-    .. method:: set_value(key, value, domain=None)
-
-        Set the given value for the given stats key. If domain is ``None`` the
-        global stat table is used, otherwise the domain-specific one is, which
-        must be opened or a ``KeyError`` will be raised.
-
     .. method:: get_stats(domain=None)
 
         Get all stats from the given domain/spider (if domain is given) or all
@@ -147,15 +141,17 @@ class (which they all inherit from).
         stats table is used, which must be opened or a ``KeyError`` will be
         raised.
 
-    .. method:: max_value(key, value, default, domain=None)
+    .. method:: max_value(key, value, domain=None)
 
-        Set the given value for the given stats only if previous value for same
-        key (or default if not seted) is lower than value.
+        Set the given value for the given key only if current value for the
+        same key is lower than value. If there is no current value for the
+        given key, the value values is always set.
 
-    .. method:: min_value(key, value, default, domain=None)
+    .. method:: min_value(key, value, domain=None)
 
-        Set the given value for the given stats only if previous value for same
-        key (or default if not seted) is greater than value.
+        Set the given value for the given key only if current value for the
+        same key is greater than value. If there is no current value for the
+        given key, the value values is always set.
 
     .. method:: clear_stats(domain=None)
 

scrapy/core/scraper.py

@@ -85,7 +85,7 @@ class Scraper(object):
         site = self.sites[spider.domain_name]
         dfd = site.add_response_request(response, request)
         stats.max_value('scraper/max_active_size', \
-                site.active_size, 0, domain=spider.domain_name),
+                site.active_size, domain=spider.domain_name),
         def finish_scraping(_):
             site.finish_response(response)
             self._scrape_next(spider, site)
@@ -161,7 +161,7 @@ class Scraper(object):
                 item=output, spider=spider, response=response)
             self.sites[domain].itemproc_size += 1
             stats.max_value('scraper/max_itemproc_size', \
-                    self.sites[domain].itemproc_size, 0, domain=domain)
+                    self.sites[domain].itemproc_size, domain=domain)
             dfd = self.itemproc.process_item(output, spider)
             dfd.addBoth(self._itemproc_finished, output, spider)
             return dfd

scrapy/stats/collector/__init__.py

@@ -37,13 +37,13 @@ class StatsCollector(object):
         d = self._stats[domain]
         d[key] = d.setdefault(key, start) + count
 
-    def max_value(self, key, value, default, domain=None):
+    def max_value(self, key, value, domain=None):
         d = self._stats[domain]
-        d[key] = max(d.setdefault(key, default), value)
+        d[key] = max(d.setdefault(key, value), value)
 
-    def min_value(self, key, value, default, domain=None):
+    def min_value(self, key, value, domain=None):
         d = self._stats[domain]
-        d[key] = min(d.setdefault(key, default), value)
+        d[key] = min(d.setdefault(key, value), value)
 
     def clear_stats(self, domain=None):
         self._stats[domain].clear()
@@ -95,3 +95,11 @@ class DummyStatsCollector(StatsCollector):
 
     def inc_value(self, key, count=1, start=0, domain=None):
         pass
+
+    def max_value(self, key, value, domain=None):
+        pass
+
+    def min_value(self, key, value, domain=None):
+        pass
+
+