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https://issues.apache.org/jira/browse/FELIX-2246?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Felix Meschberger updated FELIX-2246:
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Attachment: SimpleWebConsoleFactory.java
Variation of Valentin's SimpleWebConsoleFactory.java class:
* Moved to a different package to allow embedding in the client bundle for
truly lazy loading and wiring
* Copied the WebConsoleConstants for label and title (again for lazy wiring
to the Web Console API)
* Changed createPlugin return type to Object (for lazy wiring at service
creation time)
* Added disposePlugin method to allow for plugin disposal (supporting lazy
wiring)
WDYT ?
> Lazy initialization of plugins
> ------------------------------
>
> Key: FELIX-2246
> URL: https://issues.apache.org/jira/browse/FELIX-2246
> Project: Felix
> Issue Type: Improvement
> Components: Web Console
> Affects Versions: webconsole-3.0.0
> Reporter: Valentin Valchev
> Assignee: Felix Meschberger
> Attachments: FELIX-2246.patch, lazy-webconsole-plugins.jude,
> lazy-webconsole-plugins.png, lazyloading.patch, SimpleWebConsoleFactory.java,
> SimpleWebConsoleFactory.java
>
>
> Here at ProSyst we use a small trick to delay initialization of our services:
> When the service is quite big, and loads many resources (incl. too many
> classes), we register not a service, but a ServiceFactory instead. With that
> factory we delay the instantiation of the service, when it is actually needed
> and obtained by other bundle.
> Yes, this makes the code a little bit more complex, but it greatly improves
> the start-up time and the overall memory usage.
> This can be applied to webconsole plugins too. My idea is that Web Console
> should only track Service Reference without actually obtaining the service
> itself [not getService()].
> When the user makes request the WebConsole calls the factory to create
> instance. Instance is created and returned to the Web Console, which uses it
> to generate content for the request.
> This way a plugin is actually not initialized until it is really used. Only
> small portion of classes, from the bundle are initialized.
> Unfortunately the ServiceTracker, when notified for added service obtains the
> real service object. So it might be better to use directly ServiceListener
> for the plugins.
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