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https://issues.apache.org/jira/browse/TAPESTRY-2244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12576681#action_12576681
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Andreas Andreou commented on TAPESTRY-2244:
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So, does this mean that it suffers from the same issue/feature, or not?
I've read that T5 doesn't rewind, so i dont know if getEntities() will ever get
called
BEFORE the form ends processing, but if it does, then the issue/feature i
describe will exist.
For reference, here's the T4 situation:
Assuming a form that displays a list of entities and also allows me to add a
new one
and i do submit a new one, here's what will happen:
- the new entity will be added to the db.
- the rendering of the page will NOT show me the new entity
because getEntities() will (probably - depends on how components are laid out)
have been cached before
> Add @Cached annotation for caching method values
> ------------------------------------------------
>
> Key: TAPESTRY-2244
> URL: https://issues.apache.org/jira/browse/TAPESTRY-2244
> Project: Tapestry
> Issue Type: New Feature
> Components: tapestry-core
> Affects Versions: 5.0.10
> Reporter: Dan Adams
> Assignee: Dan Adams
> Fix For: 5.0.11
>
>
> The @Once annotation can be used on methods to cache the value or cache the
> value based on some other value changing (great for loops). We've been using
> it in our internal CMS library and it's immensly useful, especially when
> getting things out of any kind of database or doing queries. Here's a typical
> usage:
> class:
> @Once
> public List<Entities> getEntities() {
> // get and return the objects from the database or something
> }
> in the template:
> <t:if test="!entities.empty">
> do something
> </t:if>
> <t:loop source="entities">
> loop through and do something
> </t:loop>
> In this example, getEntities gets cached on the if test and then the value is
> cached so it doesn't get called again on the loop. You can also use it this
> way:
> @Property
> private Entity loopValue;
> @Once(watch="loopValue")
> public Object getSomeDependentValue() {
> // do some expensive operation based on loopValue
> }
> which will only execute the method each time loopValue changes.
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