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From "Arkadi Shishlov (JIRA)" <>
Subject [jira] [Commented] (CAMEL-4009) Fast @Converter loading in uber-jar
Date Sat, 28 May 2011 20:08:47 GMT


Arkadi Shishlov commented on CAMEL-4009:

bq. We cannot break the API as there are 3rd party type converter loaders that depend on the
current API.

Could you please point me to them so I could evaluate the impact?

bq. So if you can find a way without breaking the API we may consider the patch. And yes we
prefer patches that have been polished and documented.

I believe the public API is not broken. I only changed _protected find()_ signatures and semantic
of _customResourceLocator()_ is left intact. I can add original _find(String package)_ if
you wish.

Otherwise, is it ok?

> Fast @Converter loading in uber-jar
> -----------------------------------
>                 Key: CAMEL-4009
>                 URL:
>             Project: Camel
>          Issue Type: Improvement
>          Components: camel-core
>    Affects Versions: 2.7.0
>            Reporter: Arkadi Shishlov
>            Priority: Minor
>              Labels: uber-jar
>             Fix For: Future
>         Attachments: apache-camel-r1127037-fast-TypeConverter-loading-in-uber-jar.diff
> Currently, the @Converter converters are loaded as follows
> {noformat}
> for package in TypeConverter meta-inf resource
>   get package url from classloader
>   if url is jar
>     for entries in jar
>       if entry match package
>         check annotation
> {noformat}
> This is very inefficient approach when application is packaged into uber-jar as expensive
iteration is performed multiple times over same jar.
> The attached patch changes loop into:
> {noformat}
> for package in TypeConverter meta-inf resource
>   get package url from classloader
>   create map url -> package names
>   for url in distinct url
>     if jar
>       for entries in jar
>         for package in packages
>           if entry match package
>             check annotation
> {noformat}
> With this patch I was able to cut startup time significantly from 15sec spent on @Converter-s
load to 2sec on 45MB 29k entries uber-jar.
> I understand that the solution is not pretty but resolves a very practical problem. Let
me know if you want me to polish it and update the javadoc.

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