objectify

src/writer.py

@@ -7,10 +7,11 @@ class Writer:
    def __init__(self, writer):
       self.writer = writer
       self.previous = Line([])
+      self.chooser = LineChooserLatestSticky()
 
    def write(self, v):
       latest = Line(v)
-      chosen = Line.choose(self.previous, latest)
+      chosen = self.chooser.choose(self.previous, latest)
       if chosen.v != self.previous.v:
          self.writer.write(chosen)
       self.previous = chosen
@@ -73,13 +74,24 @@ class Line:
    def __str__(self):
       return json.dumps({"t":self.t, "v": self.v})
 
+   def is_nothing(self):
+      return not self.v
+
+   def is_recent(self):
+      return time.time() - self.t < 1
+
+class LineChooser:
    def choose(a, b):
       if not a:
          return b
       if not b:
          return a
+      return self._choose(a, b)
+
+class LineChooserLatestSticky(LineChooser):
+   def _choose(self, a, b):
       latest = max([a,b], key=lambda x:x.t)
       oldest = min([a,b], key=lambda x:x.t)
-      if not latest.v and time.time() - oldest.t < 1:
+      if latest.is_nothing() and oldest.is_recent():
          return oldest
       return latest