Add Trait to write an 'OpaqueView' to the TES which makes the underlying object inaccessible

Provide the ability to write an object into the TES that for all intents and purposes is unreadable. Useful in case it is eg. purely the 'backing store' for a view, and the original should never be accessed directly, and only through the separately written view. Possible use-cases for this are the ability to write multiple views all using the same backing store -- which cannot be achieved using writeViewFor, which assumes a one-to-one-invertible relation between view and backing store. Also allows for views which cannot be automatically constructed from their backing store as required by writeViewFor, in which case a dedicate view can be created and stored, separately from the backing store which can be hidden behind an opaqueView.

I guess the use case comes in a separate merge request and will make it clearer how this is intended to be used?

that MR already exists: lhcb/LHCb!3390 (closed) -- this just moves the functionality into Gaudi, where it can sit together with the other 'traits'. So this is just (re)packaging things 'the right way'.

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• 313d4cd3 - Add Trait to write an 'OpaqueView' to the TES which makes the underlying object inaccessible

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approved this merge request

changed milestone to %v36r5

added lhcb-gaudi-head label

assigned to @clemenci

The only comment I have is that we should stop using the ProduceConsume.py example to test all Gaudi::Functional features... But it can wait for the day I manage to rename GaudiExamples to GaudiTests.

• [2022-03-24 00:04] Automatic merge failed in [lhcb-gaudi-head#3196](https://lhcb-nightlies.web.cern.ch/nightly/lhcb-gaudi-head/3196/Gaudi/checkout
• [2022-03-24 00:34] Automatic merge failed in [lhcb-run2-gaudi-head#295](https://lhcb-nightlies.web.cern.ch/nightly/lhcb-run2-gaudi-head/295/Gaudi/checkout
• [2022-03-25 00:06] Automatic merge failed in [lhcb-gaudi-head#3197](https://lhcb-nightlies.web.cern.ch/nightly/lhcb-gaudi-head/3197/Gaudi/checkout
• [2022-03-25 00:39] Automatic merge failed in [lhcb-run2-gaudi-head#296](https://lhcb-nightlies.web.cern.ch/nightly/lhcb-run2-gaudi-head/296/Gaudi/checkout
• [2022-03-26 00:04] Automatic merge failed in [lhcb-gaudi-head#3198](https://lhcb-nightlies.web.cern.ch/nightly/lhcb-gaudi-head/3198/Gaudi/checkout
• [2022-03-26 00:42] Automatic merge failed in [lhcb-run2-gaudi-head#297](https://lhcb-nightlies.web.cern.ch/nightly/lhcb-run2-gaudi-head/297/Gaudi/checkout
• [2022-03-26 00:53] Automatic merge failed in [lhcb-gaudi-head#3198](https://lhcb-nightlies.web.cern.ch/nightly/lhcb-gaudi-head/3198/Gaudi/checkout
• [2022-03-29 00:05] Automatic merge failed in [lhcb-gaudi-head#3199](https://lhcb-nightlies.web.cern.ch/nightly/lhcb-gaudi-head/3199/Gaudi/checkout
• [2022-03-29 00:25] Automatic merge failed in [lhcb-run2-gaudi-head#298](https://lhcb-nightlies.web.cern.ch/nightly/lhcb-run2-gaudi-head/298/Gaudi/checkout
• [2022-03-29 00:35] Automatic merge failed in [lhcb-gaudi-head#3199](https://lhcb-nightlies.web.cern.ch/nightly/lhcb-gaudi-head/3199/Gaudi/checkout
• [2022-03-29 00:47] Automatic merge failed in [lhcb-gaudi-head#3199](https://lhcb-nightlies.web.cern.ch/nightly/lhcb-gaudi-head/3199/Gaudi/checkout
• [2022-03-30 00:04] Automatic merge failed in [lhcb-gaudi-head#3200](https://lhcb-nightlies.web.cern.ch/nightly/lhcb-gaudi-head/3200/Gaudi/checkout
• [2022-03-30 00:23] Automatic merge failed in [lhcb-run2-gaudi-head#299](https://lhcb-nightlies.web.cern.ch/nightly/lhcb-run2-gaudi-head/299/Gaudi/checkout
• [2022-03-31 00:06] Validation started with lhcb-gaudi-head#3201
• [2022-03-31 00:49] Validation started with lhcb-run2-gaudi-head#300
• [2022-04-01 00:03] Validation started with lhcb-gaudi-head#3202
• [2022-04-01 00:53] Validation started with lhcb-run2-gaudi-head#301

added 40 commits

• 313d4cd3...3ef4ac76 - 39 commits from branch master
• 92b36d59 - Add Trait to write an 'OpaqueView' to the TES which makes the underlying object inaccessible

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added 1 commit

• a1a07f33 - Add Trait to write an 'OpaqueView' to the TES which makes the underlying object inaccessible

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approved this merge request

merged

mentioned in commit bd7f63c2

mentioned in commit lhcb/LHCb@af0097fe

mentioned in commit lhcb/LHCb@063d1a2f