added BufferedJSON

dap/utils/bufjson.py

@@ -0,0 +1,35 @@
+import os
+from time import sleep
+
+from .utils import json_load
+
+
+class BufferedJSON:
+
+    def __init__(self, fname):
+        self.fname = fname
+        self.last_time = self.get_time()
+        self.last_data = self.get_data()
+
+
+    def load(self):
+        current_time = self.get_time()
+        time_delta = current_time - self.last_time
+        if time_delta <= 2: #TODO: is that a good time?
+            return self.last_data
+
+        sleep(0.5) #TODO: why?
+        current_data = self.get_data()
+        self.last_time = current_time
+        self.last_data = current_data
+        return current_data
+
+
+    def get_time(self):
+        return os.path.getmtime(self.fname)
+
+    def get_data(self, *args, **kwargs):
+        return json_load(self.fname, *args, **kwargs)
+
+
+