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Diffstat (limited to 'heat/engine/resource.py')
| -rw-r--r-- | heat/engine/resource.py | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/heat/engine/resource.py b/heat/engine/resource.py index 4795ca42b..69f6479e6 100644 --- a/heat/engine/resource.py +++ b/heat/engine/resource.py @@ -1459,6 +1459,23 @@ class Resource(status.ResourceStatus): new_requires=new_requires) runner(timeout=timeout, progress_callback=progress_callback) + def handle_preempt(self): + """Pre-empt an in-progress update when a new update is available. + + This method is called when a previous convergence update is in + progress but a new update for the resource is available. By default + it does nothing, but subclasses may override it to cancel the + in-progress update if it is safe to do so. + + Note that this method does not run in the context of the in-progress + update and has no access to runtime information about it; nor is it + safe to make changes to the Resource in the database. If implemented, + this method should cause the existing update to complete by external + means. If this leaves the resource in a FAILED state, that should be + taken into account in needs_replace_failed(). + """ + return + def preview_update(self, after, before, after_props, before_props, prev_resource, check_init_complete=False): """Simulates update without actually updating the resource. |