From 6c7c556770527f6cef8ffc1a8b7fd732b1a3ad7c Mon Sep 17 00:00:00 2001
From: Wieland Hoffmann <themineo@gmail.com>
Date: Sat, 4 Jun 2016 15:44:50 +0200
Subject: [PATCH] Add a subclass of Retry providing linear backoff time

Signed-off-by: Wieland Hoffmann <themineo@gmail.com>
---
 musicbrainzngs/musicbrainz.py | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/musicbrainzngs/musicbrainz.py b/musicbrainzngs/musicbrainz.py
index 127e937..fb9172b 100644
--- a/musicbrainzngs/musicbrainz.py
+++ b/musicbrainzngs/musicbrainz.py
@@ -23,9 +23,27 @@
 _version = "0.7dev"
 _log = logging.getLogger("musicbrainzngs")
 
-_retry = Retry(total=8,
-               status_forcelist=[500, 502, 503],
-               backoff_factor=0.1)
+
+class MBRetry(Retry):
+    """Retry class whose backoff time is::
+
+         { number of observed errors } * 2.0
+
+    """
+
+    def get_backoff_time(self):
+        """ Formula for computing the current backoff
+
+        :rtype: float
+        """
+        if self._observed_errors <= 1:
+            return 0
+
+        return self._observed_errors * 2.0
+
+
+_retry = MBRetry(total=8,
+               status_forcelist=[500, 502, 503])
 
 LUCENE_SPECIAL = r'([+\-&|!(){}\[\]\^"~*?:\\\/])'