[jira] Resolved: (CLK-703) Load pages and templates on demand

["Bob Schellink (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CLK-703?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bob Schellink resolved CLK-703.
-------------------------------

    Resolution: Won't Fix

I've spent some time creating a lazy class loading scheme using various approaches. Couldn't find an easy way which preserved the simplicity and performance of ConfigService. I'm sure with enough time and effort the performance and locking issues could be resolved, however the complexity goes up drastically when dealing with multiple threads. This is especially true for services dependent on page class metadata such as SpringClickServlet. Under an eager loading scheme, SpringClickServlet can cache page class metadata (ie page setters) during the Servlet init() event without concern for synchronization. Under a lazy loading scheme, metadata has to be obtained at runtime, pushing synchronization handling onto this class. Not something I'd like to face.

My main motivation for this change was to address an issue with Google App Engine where it doesn't allow Click to lookup template files under the root ("/") web folder. However it seems that GAE does allow looking up resources under subfolders of root. By introducing a convention where pages are located under the 'page' or 'pages' folder, we can again support automapping in production environments, albeit with a small caveat.

> Load pages and templates on demand
> ----------------------------------
>
>                 Key: CLK-703
>                 URL: https://issues.apache.org/jira/browse/CLK-703
>             Project: Click
>          Issue Type: Improvement
>          Components: core
>            Reporter: Bob Schellink
>            Assignee: Bob Schellink
>             Fix For: 2.3.0-M1
>
>
> At startup time Click eagerly loads templates (and associated page classes) found under the web folder. 
> The proposed change is to switch to a lazy loading scheme where pages and templates are only loaded when requested. Scenarios needed to be catered for include:
> - HTTP Request
> - Page.setRedirect
> - Page.setForward
> There is also an outstanding bug which depends on this proposal: https://issues.apache.org/jira/browse/CLK-639

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