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https://issues.apache.org/jira/browse/TAP5-2099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15166423#comment-15166423
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Barry Books commented on TAP5-2099:
-----------------------------------
I added some logging code to the GitHub project so you can see when get/set is
called. it's been 3 years since I looked thru the code and I don't remember how
the value is stored either.
As far not calling the set method if isInvariant() is true I don't think that
the right thing to do. isInvariant means get always returns the same value so
the binding can be cached. Suppose I wanted to create an alt: binding to
alternate between values as in
alt:red,green,blue
this binding would return isInvariant() false but the set method would still do
nothing. The selector binding I wrote also returned isInvariant() false but the
set method does nothing. I downloaded all the 5.4 source so I'll make a change,
run the test cases and submit a patch if they pass.
> Update parameters bound to literal: or symbol: from a mixin
> -----------------------------------------------------------
>
> Key: TAP5-2099
> URL: https://issues.apache.org/jira/browse/TAP5-2099
> Project: Tapestry 5
> Issue Type: Improvement
> Affects Versions: 5.3.6, 5.4
> Reporter: Lance
> Labels: patch
> Attachments: TAP52099-1.patch
>
>
> Currently, I cannot update a component component parameter that is
> initialized with a literal: or symbol: binding from a mixin. If I try to
> @BindParameter the param and change it's value, I get a "Binding %s is
> read-only" exception (originating from AbstractBinding).
> I propose that literal and symbol bindings are sourced from a PerThreadValue
> that can be updated by a mixin.
> My original need for this was to create a "SinglePage" mixin for the Grid
> component which would set the rowsPerPage parameter to Integer.MAX_VALUE. I
> can't currently do this because by default, the parameter is a symbol:
> binding.
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