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[r] Use cached SOMA context rather than re-creating #2988

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mojaveazure
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Cache a SOMA context during $new() as a private field when instantiating new objects. This cached context can then be used in other methods. Note, this PR is not yet changing the UX of config/context options. As the context from soma_context() is cached globally, we can modify the global one before instantiating to test customized cached contexts

Modified SOMA methods:

  • TileDBObject$new(): creates context and caches it within the object
  • TileDBGroup$create(): no longer caches context, instead uses cached context from $new()
  • TileDBGroup$open(): uses cached context rather than calling soma_context()

SC-55084

Cache a SOMA context during `$new()` as a private field when
instantiating new objects. This cached context can then be used in other
methods. Note, this PR is not yet changing the UX of config/context
options. As the context from `soma_context()` is cached globally, we can
modify the global one before instantiating to test customized cached
contexts

Modified SOMA methods:
 - `TileDBObject$new()`: creates context and caches it within the object
 - `TileDBGroup$create()`: no longer caches context, instead uses cached
   context from `$new()`
 - `TileDBGroup$open()`: uses cached context rather than calling
   `soma_context()`

[SC-55084](https://app.shortcut.com/tiledb-inc/story/55084/)
@@ -38,6 +38,13 @@ TileDBObject <- R6::R6Class(
private$.tiledbsoma_ctx <- tiledbsoma_ctx
private$.tiledb_ctx <- self$tiledbsoma_ctx$context()

# TODO: re-enable once new UX is worked out
# soma_context <- soma_context %||% soma_context()
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I think we want this active to be able to test as we just did with different regions. So let's expand the signature, and label the accessor as temporary. It's not in the 'official' user facing factory method.

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We may also want to add the 'existence proof test' in a test file, possibly commented out (and we don't call aws, usually) -- but for illustration?

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Because soma_context() caches globally, my thought process was that we could use the global context for modifications without changing the signature

soma_context(config = c(vfs.s3.region = "us-west-2"))
grp <- TileDBGroup$new(uri, ...)

If you feel strongly otherwise, I can change this

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Ah, fair, but that is kinda a hidden feature I will have to take out at some point?

But agreed, for now it can stay.

Bump develop version
Add commented existence proof via cached global context

[ci skip]
@mojaveazure mojaveazure merged commit d9bd18d into main Sep 12, 2024
@mojaveazure mojaveazure deleted the paulhoffman/sc-55084/use-cached-soma-context-in-tiledbsoma-r-objects branch September 12, 2024 23:02
@eddelbuettel
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Good additions in the last comit.

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2 participants