[18.0][REF] queue_job: Use set.discard(...) instead of SafeSet

queue_job/jobrunner/channels.py

@@ -75,8 +75,7 @@
     def add(self, o):
         if o is None:
             raise ValueError()
-        if o in self._removed:
-            self._removed.remove(o)
+        self._removed.discard(o)
         if o in self._known:
             return
         self._known.add(o)
@@ -87,8 +86,7 @@
             raise ValueError()
         if o not in self._known:
             return
-        if o not in self._removed:
-            self._removed.add(o)
+        self._removed.add(o)
 
     def pop(self):
         while True:
@@ -104,24 +102,6 @@
                 return o
 
 
-class SafeSet(set):
-    """A set that does not raise KeyError when removing non-existent items.
-
-    >>> s = SafeSet()
-    >>> s.remove(1)
-    >>> len(s)
-    0
-    >>> s.remove(1)
-    """
-
-    def remove(self, o):
-        # pylint: disable=missing-return,except-pass
-        try:
-            super().remove(o)
-        except KeyError:
-            pass
-
-
 @total_ordering
 class ChannelJob:
     """A channel job is attached to a channel and holds the properties of a
@@ -408,8 +388,8 @@
             self.parent.children[name] = self
         self.children = {}
         self._queue = ChannelQueue()
-        self._running = SafeSet()
-        self._failed = SafeSet()
+        self._running = set()
+        self._failed = set()
         self._pause_until = 0  # utc seconds since the epoch
         self.capacity = capacity
         self.throttle = throttle  # seconds
@@ -463,8 +443,8 @@
     def remove(self, job):
         """Remove a job from the channel."""
         self._queue.remove(job)
-        self._running.remove(job)
-        self._failed.remove(job)
+        self._running.discard(job)
+        self._failed.discard(job)
         if self.parent:
             self.parent.remove(job)
 
@@ -484,8 +464,8 @@
         """
         if job not in self._queue:
             self._queue.add(job)
-            self._running.remove(job)
-            self._failed.remove(job)
+            self._running.discard(job)
+            self._failed.discard(job)
             if self.parent:
                 self.parent.remove(job)
             _logger.debug("job %s marked pending in channel %s", job.uuid, self)
@@ -498,7 +478,7 @@
         if job not in self._running:
             self._queue.remove(job)
             self._running.add(job)
-            self._failed.remove(job)
+            self._failed.discard(job)
             if self.parent:
                 self.parent.set_running(job)
             _logger.debug("job %s marked running in channel %s", job.uuid, self)
@@ -507,7 +487,7 @@
         """Mark the job as failed."""
         if job not in self._failed:
             self._queue.remove(job)
-            self._running.remove(job)
+            self._running.discard(job)
             self._failed.add(job)
             if self.parent:
                 self.parent.remove(job)