Mark Nelson ffd7798c96 MDL-56139 core: changes after peer review
- No longer use the Fibonacci sequence for delaying the timeout.
  It is too aggressive.
- The backoff_timer AMD module now expects the callback AND the
  backoff function to be passed to the constructor.
- Added ability to specify polling frequency in config.php.
- Added helper function to return the cache key.
- Reworded the parameters for clarity.
2016-11-16 10:22:52 +08:00
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