Nir Soffer has posted comments on this change.

Change subject: storage: Introduce guarded utilities
......................................................................


Patch Set 6:

(3 comments)

https://gerrit.ovirt.org/#/c/61435/6/lib/vdsm/storage/guarded.py
File lib/vdsm/storage/guarded.py:

Line 135:     def __hash__(self):
Line 136:         return hash(self._key())
Line 137: 
Line 138:     def _key(self):
Line 139:         return type(self), self.ns, self.name, self.mode
> Not sure I follow.  There is a bug in VolumeLease (see below) but once that
_key cannot be implemented by the superclass since it does not know anything 
about the subclass properties. See the example implementation bellow.
Line 140: 
Line 141: 
Line 142: class ResourceManagerLock(LockInterface):
Line 143:     def __init__(self, ns, name, mode):


Line 160:     def acquire(self):
Line 161:         rmanager.acquireResource(self.ns, self.name, self.mode)
Line 162: 
Line 163:     def release(self):
Line 164:         rmanager.releaseResource(self.ns, self.name)
Here is the _key for this class:

    def _key(self):
        return (type(self), self._ns, self._name, self._mode)
Line 165: 
Line 166: 
Line 167: class VolumeLease(LockInterface):
Line 168:     MODE = "exclusive"  # All volume leases are exclusive


Line 190:         dom.acquireVolumeLease(self._host_id, self._img_id, 
self._vol_id)
Line 191: 
Line 192:     def release(self):
Line 193:         dom = sdCache.produce_manifest(self._sd_id)
Line 194:         dom.releaseVolumeLease(self._img_id, self._vol_id)
Here is the key for this class:

    def _key(self):
        return (type(self), self._host_id, self._sd_id, self._img_id, 
self._vol_id)


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Gerrit-MessageType: comment
Gerrit-Change-Id: I2b0a204818d44b6205515277f4c2834cb2b7a057
Gerrit-PatchSet: 6
Gerrit-Project: vdsm
Gerrit-Branch: master
Gerrit-Owner: Adam Litke <[email protected]>
Gerrit-Reviewer: Adam Litke <[email protected]>
Gerrit-Reviewer: Freddy Rolland <[email protected]>
Gerrit-Reviewer: Jenkins CI
Gerrit-Reviewer: Liron Aravot <[email protected]>
Gerrit-Reviewer: Nir Soffer <[email protected]>
Gerrit-Reviewer: gerrit-hooks <[email protected]>
Gerrit-HasComments: Yes
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