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From "Alexander Klimetschek (JIRA)" <>
Subject [jira] Commented: (COCOON-2044) servlet: protocol URIs have to be globally unique for use as cache-keys
Date Wed, 18 Apr 2007 13:57:17 GMT


Alexander Klimetschek commented on COCOON-2044:

Unfortunately, using servlet:servlet does not work.
The problem is that the XSLT processor uses the source.getURI() String and tries to parse
it himself. Thus, only a certain subset of URIs can be used here (things known to him). I
tried using servlet:12345:/some/file/path and it failed.

The thing that works are my proposed query parameters: servlet:/some/file/path?servlet-services-id=12345.
I am using a number-based ID because I use System.identityHashCode() on the current servlet
context since this is the only identifier that works.

        String id = String.valueOf(System.identityHashCode(CallFrameHelper.getContext()));

It is not possible to get the mount path or bean id of the servlet, because it is not yet
accessible in the ServletSource constructor (where the system id is set). Important to know
here is that in the case of the "outer" sitemap that handles the browser request, the ServletContext
is not a ServletServiceContext (hmmm, when writing this I am not quite sure....). At least
the Request/Response objects are the original ones (only wrapped by DynamicProxyRequestHandler);
in a servlet internal call they are BlockCallHttpServletRequest/Response.

> servlet: protocol URIs have to be globally unique for use as cache-keys
> -----------------------------------------------------------------------
>                 Key: COCOON-2044
>                 URL:
>             Project: Cocoon
>          Issue Type: Bug
>          Components: - Servlet service framework
>    Affects Versions: 2.2-dev (Current SVN)
>            Reporter: Alexander Klimetschek
>         Assigned To: Grzegorz Kossakowski
>            Priority: Critical
> All servlet protocol URIs like servlet:/some/thing or servlet:super:/foo/bar or servlet:myblock:/another/path
have to be globally unique because they are used in the cache, of which there is only one
global with globally acting keys.
> There are two caches in standard Cocoon configuration (the only ones I know of ;-), both
with a different key generation. Here are ideas how to make the keys global:
> a) EHDefaultStore for caching resources of caching pipelines: they use the uriPrefix
of the Enviroment in the key, so providing a uriPrefix (eg. the mount path of the servlet)
works here.
> b) DefaultTransientStore which caches XSLT and JX generator sources (don't know why this
is different from a)): they do not use the uriPrefix and much worse, they need correct URIs
because they are read by the XSLT processor, who does not like things like servlet:uniqueID34:/xsl/stylesheet.xsl
containing arbitrary schemes at the beginning. Appending an ID via a query parameter seems
the only working solution (tried it already): servlet:/xsl/stylesheet.xsl?servlet-services-id=12345
> Another solution would be to have one cache per sitemap, so that the keys don't have
to be unique anymore. But I don't know how to configure that and if this is feasible.

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