lldb/examples/summaries/cocoa/cache.py

   1 """
   2 Objective-C runtime wrapper for use by LLDB Python formatters
   3
   4 Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   5 See https://llvm.org/LICENSE.txt for license information.
   6 SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   7 """
   8 import lldb.formatters.metrics
   9
  10
  11 class Cache:
  12     def __init__(self):
  13         self.data = {}
  14         self.statistics = lldb.formatters.metrics.Metrics()
  15         self.statistics.add_metric("hit")
  16         self.statistics.add_metric("miss")
  17
  18     def look_for_key(self, key):
  19         if key in self.data:
  20             return True
  21         return False
  22
  23     def add_item(self, key, value, ok_to_replace=True):
  24         if not (ok_to_replace) and self.look_for_key(key):
  25             return False
  26         self.data[key] = value
  27         return True
  28
  29     def get_value(self, key, default=None):
  30         if self.look_for_key(key):
  31             self.statistics.metric_hit("hit", key)
  32             return self.data[key]
  33         else:
  34             self.statistics.metric_hit("miss", key)
  35             return default