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From "Felix Meschberger (JIRA)" <j...@apache.org>
Subject [jira] Commented: (FELIX-2246) Lazy initialization of plugins
Date Wed, 07 Apr 2010 12:01:34 GMT

    [ https://issues.apache.org/jira/browse/FELIX-2246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12854440#action_12854440

Felix Meschberger commented on FELIX-2246:

Committed my FELIX-2246.patch with a slight modification: I have moved the getLocalizedLabelMap
method from the OsgiManager class to the PluginHolder because the PluginHolder has the internal
knowledge of registered plugins, their titles, and the providing bundles.

> 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
> 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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