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From "Niclas Hedhman (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ZEST-105) ValueSerialization Type Lookup is wrong.
Date Thu, 23 Jul 2015 01:04:04 GMT
Niclas Hedhman created ZEST-105:

             Summary: ValueSerialization Type Lookup is wrong.
                 Key: ZEST-105
                 URL: https://issues.apache.org/jira/browse/ZEST-105
             Project: Zest
          Issue Type: Bug
    Affects Versions: 2.0, 2.1
            Reporter: Niclas Hedhman
             Fix For: 3.0

The ValueSerialization extensions are dependent on type lookup when deserializing values,
but they go about it in the wrong way. They make the type lookup relative to their own Module,
which completely breaks everything, and it can't even be worked around in many cases.

Entities that has values in them, are not prone to this, since a slightly different approach
is done in the entity store, although I am not sure it is immune to this Visibility/TypeLookup

There is even a "Value Type Finder" feature in the whole subsystem, which is a hack-ish work-around
the short-comings of the actual API.

At a minimum, a Module needs to be provided for which the Visibility should be computed from.
It is likely that the Module used is dynamic, and changes as the Value Type tree is traversed,
i.e. when a nested type is "found" its Module (i.e. the module it was found in) should be
used for its further TypeLookup operations. This mimics the UnitOfWork to a much closer degree.

The necessary model elements are present, and to correct the implementations shouldn't be
too hard, but there will be a change in the ValueSerialization API/SPI, and we should simply
delay the change until 3.0. There might be many over wanted changes that could affect the
new design.

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