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Provide correct API for monitoring an LRO (instances). #4045

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Sep 25, 2017
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Provide correct API for monitoring an LRO (instances). #4045

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20 changes: 6 additions & 14 deletions docs/spanner/instance-usage.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -141,32 +141,24 @@ Delete an instance using its

.. _check-on-current-instance-operation:

Check on Current Instance Operation
-----------------------------------
Resolve Current Instance Operation
----------------------------------

The :meth:`~google.cloud.spanner.instance.Instance.create` and
:meth:`~google.cloud.spanner.instance.Instance.update` methods of instance
object trigger long-running operations on the server, and return instances
of the :class:`~google.cloud.spanner.instance.Operation` class.

You can check if a long-running operation has finished
by using its :meth:`~google.cloud.spanner.instance.Operation.finished`
method:
If you want to block on the completion of those operations, use the
``result`` method on the returned objects:

.. code:: python

>>> operation = instance.create()
>>> operation.finished()
True
>>> result = operation.result()

.. note::
This method will raise an exception if the operation fails.

Once an :class:`~google.cloud.spanner.instance.Operation` object
has returned :data:`True` from its
:meth:`~google.cloud.spanner.instance.Operation.finished` method, the
object should not be re-used. Subsequent calls to
:meth:`~google.cloud.spanner.instance.Operation.finished`
will result in an :exc`ValueError` being raised.

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