VOL-351: Assign unique ID to Channelgroup xPON object for HA
Change-Id: I14bb71dde475aaaafc7c8b53ec9fbc3d1a3dc3cc
diff --git a/common/utils/indexpool.py b/common/utils/indexpool.py
new file mode 100644
index 0000000..24f57ff
--- /dev/null
+++ b/common/utils/indexpool.py
@@ -0,0 +1,36 @@
+from bitstring import BitArray
+import structlog
+
+log = structlog.get_logger()
+
+class IndexPool(object):
+ def __init__(self, max_entries, offset):
+ self.max_entries = max_entries
+ self.offset = offset
+ self.indices = BitArray(self.max_entries)
+
+ def get_next(self):
+ try:
+ _pos = self.indices.find('0b0')
+ self.indices.set(1, _pos)
+ return self.offset + _pos[0]
+ except IndexError:
+ log.info("exception-fail-to-allocate-id-all-bits-in-use")
+ return None
+
+ def release(self, index):
+ index -= self.offset
+ _pos = (index,)
+ try:
+ self.indices.set(0, _pos)
+ except IndexError:
+ log.info("bit-position-{}-out-of-range".format(index))
+
+ #index or multiple indices to set all of them to 1 - need to be a tuple
+ def pre_allocate(self, index):
+ if(isinstance(index, tuple)):
+ _lst = list(index)
+ for i in range(len(_lst)):
+ _lst[i] -= self.offset
+ index = tuple(_lst)
+ self.indices.set(1, index)