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https://issues.apache.org/jira/browse/WICKET-4718?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13437745#comment-13437745
]
Martin Grigorov commented on WICKET-4718:
-----------------------------------------
The default impl of
org.apache.wicket.request.resource.ResourceStreamResource#getResourceStream()
is:
/**
* Lazy or dynamic initialization of the wrapped IResourceStream(Writer)
* @return the underlying IResourceStream
*/
protected IResourceStream getResourceStream()
{
return stream;
}
Since you override it then it will do whatever you do in your implementation.
I see two solutions for your case:
1) Use
org.apache.wicket.request.resource.ResourceStreamResource#ResourceStreamResource(IResourceStream)
constructor and thus the 'stream' will be created just once and reused many
times later.
2) Cache the created value of the 'stream' in your #getResourceStream() impl
and reuse it. This will make the instantiation of 'stream' lazy.
> ResourceStreamResource#getResourceStream() is called multiple times
> -------------------------------------------------------------------
>
> Key: WICKET-4718
> URL: https://issues.apache.org/jira/browse/WICKET-4718
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 6.0.0-beta3
> Environment: Mac OS X 10.7.4 Lion, Java 6, IntelliJ Idea 11.1, Tomcat
> 7 & Jetty 7.5.0
> Reporter: Carsten Dräger
>
> When a ResourceStreamResource is implemented to return a IResourceStream
> dynamically, by returning a new instance of an extended
> AbstractResourceStream, that ResourceStream is instantiated multiple times
> when a ResourceLink is clicked.
> In my case, that ResourceStream returns an AttachmentInputStream from the
> Ektorp library (for CouchDB interaction). This behavior results in multiple
> queries (currently up to four) when I click once on a ResourceLink to that
> resource.
> Code Examples
> Extended ResourceStreamResource: http://pastebin.com/9BB7LEiV
> Extended IResouceStream: http://pastebin.com/Z7GvzGja
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