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From "Radu Cotescu (Jira)" <j...@apache.org>
Subject [jira] [Closed] (SLING-8737) Add support for lazily-evaluated bindings
Date Wed, 27 Nov 2019 09:55:00 GMT

     [ https://issues.apache.org/jira/browse/SLING-8737?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Radu Cotescu closed SLING-8737.
-------------------------------

> Add support for lazily-evaluated bindings
> -----------------------------------------
>
>                 Key: SLING-8737
>                 URL: https://issues.apache.org/jira/browse/SLING-8737
>             Project: Sling
>          Issue Type: New Feature
>          Components: Scripting
>            Reporter: Radu Cotescu
>            Assignee: Radu Cotescu
>            Priority: Major
>             Fix For: Scripting Core 2.1.0, API 2.21.0, Servlets Resolver 2.5.8
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> The {{org.apache.sling.scripting.core}} module provides support for passing a {{javax.script.Bindings}}
to script engines, through the {{org.apache.sling.scripting.core.impl.DefaultSlingScript}}
implementation of the {{org.apache.sling.api.scripting.SlingScript}} interface . {{org.apache.sling.scripting.core.impl.DefaultSlingScript}}
relies directly on {{javax.script.SimpleBindings}}, which means that the values with which
the map is populated have to be computed before insertion. In some cases these computations
are not trivial, however there's no guarantee that the values will actually be used.
> In order to optimise the {{Bindings}} usage, given that Java 8 and above provide the
[{{Supplier}}|https://docs.oracle.com/javase/8/docs/api/java/util/function/Supplier.html]
functional interface, both the {{org.apache.sling.api}} and {{org.apache.sling.scripting.core}}
modules should bring support for pushing {{Suppliers}} into the {{Bindings}} maps, suppliers
which would be invoked on-demand.



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