Add a barrier constraining execution order for notifications. #21
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Update the batch call test to verify that the reply to a batch containing a notification correctly omits the notification.
This test exercises the problem described in #20, where notification handlers can issue out of order relative to their receipt. At this commit the test fails.
When issuing a batch of requests, keep track of the number that are valid notifications, and do not issue to any handler for the batch until all notifications received in previous batches have completed. This ensures a sensible partial order on notifications. Multiple notifications in a single batch can still be executed in parallel, but notifications across batches are no longer concurrent.
When the channel to the client closes, the server discards any calls that are pending in the queue, but retains notifications. The logic for pruning the queue was incorrect, and would handle items in the wrong order.
radeksimko
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Jul 13, 2020
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GitHub seems to have lost sync between the branch and the PR. I'm going to try closing and reopening the PR to see if that enables it to resync. |
creachadair
commented
Jul 15, 2020
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An attempt to address #20.
When issuing a batch of requests, keep track of the number that are valid notifications, and do not issue to any handler for the batch until all notifications received in previous batches have completed.
This ensures a sensible partial order on notifications. Multiple notifications in a single batch can still be executed in parallel, but notifications across batches are no longer concurrent.
TODO before merging: