Adding locks and a queue in case the same domains receive another NOTIFY when the first processing is not yet completed #3

An important part of parallel-processing are locks for access on the same ressource.

There are 2 basic approaches to this:

Cancel the current processing and start the new one
This could be favoured, because the new job is more up-to-date and could/should include some of the current processing steps too
Let the current one finish and put the new one in a queue.
This is potentially alot cleaner, but will increase timing significantly.

An important part of parallel-processing are locks for access on the same ressource. There are 2 basic approaches to this: 1. Cancel the current processing and start the new one This could be favoured, because the new job is more up-to-date and could/should include some of the current processing steps too 2. Let the current one finish and put the new one in a queue. This is potentially alot cleaner, but will increase timing significantly.

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Adding locks and a queue in case the same domains receive another NOTIFY when the first processing is not yet completed #3