[jira] [Assigned] (IGNITE-14269) Design conditional multi update functionality for meta storage client

["Kirill Gusakov (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-14269?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kirill Gusakov reassigned IGNITE-14269:
---------------------------------------

    Assignee: Kirill Gusakov  (was: Andrey N. Gura)

> Design conditional multi update functionality for meta storage client
> ---------------------------------------------------------------------
>
>                 Key: IGNITE-14269
>                 URL: https://issues.apache.org/jira/browse/IGNITE-14269
>             Project: Ignite
>          Issue Type: New Feature
>            Reporter: Andrey N. Gura
>            Assignee: Kirill Gusakov
>            Priority: Major
>              Labels: iep-61, ignite-3
>
> Define entities required for implementation of conditional multi updates (aka "transactions") for meta storage.
> Requirements:
> - Design should provide possibility to define conditional updates in if-then-else manner with nested branches.
> - Update always starts with condition.
> - Any nested branch must start with condition. 
> - Update can't precede to condition.
> - Every branch can yield exactly one custom result (limited by number of simple types) and any number of entries. Corresponding expression always must be at the end of branch.
> - Condition for entry revision allows the following comparisons: equal, !equal, less, greater.
> - Condition for entry value allows the following operations (byte-wise): equal, !equal.
> - Update allows the following operations: put, remove, no-op.
> - Condition can not use previously defined condition instance again because it will lead to graph cycle and infinite update execution.
> Assumptions:
> - It seems that conditions and updates entities can be conveniently linked using chaining.
> Simple example (pseudocode):
> {code}
>     CompletableFuture<Result, List<Entry>> = invoke(valCond(EQUAL, perstEnabled, true)._then(
>              valCond(EQUAL, walEnabled, true)._then(
>                      update(walEnabled, true)).
>              _else(
>                      update(walEnabled, false))
>             )._else(NoopUpdate))
> {code}



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