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Date: Fri, 8 Oct 2010 20:08:29 +0200
Message-ID: <AANLkTi=PavvPS0GDfTwdrr_HStLBCW1KwZ1iOfpWDfd_@mail.gmail.com>
Subject: Re: [DISCUSS] Containerisms
From: Guillaume Nodet <gnodet@gmail.com>
To: dev@felix.apache.org
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On Fri, Oct 8, 2010 at 18:43, Felix Meschberger <fmeschbe@gmail.com> wrote:

> Hi,
>
> First of all: I agree with Richard in that we should at all cost prevent
> containerisms.
>
> Second: I do not really understand what the problem is, that must be
> solved with this containerism and which cannot be solved with regular
> OSGi API.
>

The real problem is to be able to discover resources in the bundle class
space. For example, i want to know all resources in foo/bar/**/*.xml The
OSGi API does not provide any way to do that atm and a lot of libraries use
 some custom things based on jars / file urls to actually iterate and
discover those resources.

The problem is just about a way to actually do things.  It seems in the
enterprise world (JEE, middleware),  we're more keen on bending the purity a
bit to the benfit of being able to achieve our goals and we're also more
keen on doing that for third party libraries.

It's true that if you write the whole osgi application from scratch, you
don't really care about supporting third party libraries.  Unfortunately,
people just won't rewrite a third party product they already use just
because they want to play nicely in OSGi.  That's my use case, and it seems
it doesn't fit well with Felix goals, so I guess i'll have to support a
custom felix version in order to do that or only support equinox.

I think I'll revert my commit as if the plan is to ditch it in the next
felix version, there's really no point in even using such a hack from my
pov.


>
> Third: For us outsiders of the specification process it is very hard to
> understand what insiders are talking of with respect to upcoming
> specifications (I only learned 5 minutes ago, that there is a public
> draft for 4.3). This issue must probably be solved by OSGi...
>
> Regards
> Felix
>
> On 08.10.2010 16:37, Guillaume Nodet wrote:
> > I was planning to start a discussion around that, so let's do that now.
> >
> > I'm not convinced we should remove this hack when classpath scanning is
> > implemented, mostly because even if then ultimately try to solve the same
> > problem, they will certainly do it in a different way.  What I mean is
> that
> > AFAIK, the classpath scanning stuff will result in a new api on the
> bundle
> > or bundleContext to iterate through resources, which means that in order
> to
> > support existing libraries, you kinda have to rewrite the whole thing in
> > order to accomodate those apis (especially if they are written so that
> they
> > work outside of osgi).
> > I think the hack i've written allows a smoother integration of those
> > libraries, with the drawback that you know it can break in certain
> > conditions.
> >
> > Also, your comment says "Do not make containerisms public."
> > In that case, it's not really public because the public face of the Felix
> > Framework is the OSGi api.
> > I guess the question comes down to wether we want Felix to remain pure
> > (without containerisms) or make it easier for people to use it (by
> bending
> > the edges when it makes sense to allow people to deploy their existing
> > libraries without rewriting the whole thing).
> > Imho, Felix is not a research prototype, nor supposed to be the cleaneest
> > reference implementation of OSGi, so adapting to the users makes sense
> imho,
> > provided that it's done conciensouly by the user by activating a flag or
> > accessing a non public api (we fall in that case here imho).
> >
> > Thoughts?
> >
> > On Fri, Oct 8, 2010 at 16:22, <rickhall@apache.org> wrote:
> >
> >> Author: rickhall
> >> Date: Fri Oct  8 14:22:39 2010
> >> New Revision: 1005843
> >>
> >> URL: http://svn.apache.org/viewvc?rev=1005843&view=rev
> >> Log:
> >> Do not make containerisms public. (FELIX-2645)
> >>
> >> Modified:
> >>
> >>
>  felix/trunk/framework/src/main/java/org/apache/felix/framework/ExtensionManager.java
> >>
> >>
>  felix/trunk/framework/src/main/java/org/apache/felix/framework/ModuleImpl.java
> >>
> >>
>  felix/trunk/framework/src/main/java/org/apache/felix/framework/URLHandlersBundleURLConnection.java
> >>
> >>
>  felix/trunk/framework/src/main/java/org/apache/felix/framework/cache/ContentDirectoryContent.java
> >>
> >>
>  felix/trunk/framework/src/main/java/org/apache/felix/framework/cache/DirectoryContent.java
> >>
> >>
>  felix/trunk/framework/src/main/java/org/apache/felix/framework/cache/JarContent.java
> >>
> >>
>  felix/trunk/framework/src/main/java/org/apache/felix/framework/resolver/Content.java
> >>
> >>
>  felix/trunk/framework/src/main/java/org/apache/felix/framework/resolver/Module.java
> >>
> >> Modified:
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/ExtensionManager.java
> >> URL:
> >>
> http://svn.apache.org/viewvc/felix/trunk/framework/src/main/java/org/apache/felix/framework/ExtensionManager.java?rev=1005843&r1=1005842&r2=1005843&view=diff
> >>
> >>
> ==============================================================================
> >> ---
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/ExtensionManager.java
> >> (original)
> >> +++
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/ExtensionManager.java
> >> Fri Oct  8 14:22:39 2010
> >> @@ -610,6 +610,7 @@ class ExtensionManager extends URLStream
> >>         return null;
> >>     }
> >>
> >> +    // TODO: REMOVE - Remove when class path scanning is implemented.
> >>     public URL getEntryAsURL(String name)
> >>     {
> >>         return null;
> >> @@ -763,6 +764,7 @@ class ExtensionManager extends URLStream
> >>             return
> >> getClass().getClassLoader().getResourceAsStream(urlPath);
> >>         }
> >>
> >> +        // TODO: REMOVE - Remove when class path scanning is
> implemented.
> >>         public URL getLocalURL(int index, String urlPath)
> >>         {
> >>             return getClass().getClassLoader().getResource(urlPath);
> >>
> >> Modified:
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/ModuleImpl.java
> >> URL:
> >>
> http://svn.apache.org/viewvc/felix/trunk/framework/src/main/java/org/apache/felix/framework/ModuleImpl.java?rev=1005843&r1=1005842&r2=1005843&view=diff
> >>
> >>
> ==============================================================================
> >> ---
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/ModuleImpl.java
> >> (original)
> >> +++
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/ModuleImpl.java
> >> Fri Oct  8 14:22:39 2010
> >> @@ -1091,6 +1091,7 @@ public class ModuleImpl implements Modul
> >>         return getContentPath()[index - 1].getEntryAsStream(urlPath);
> >>     }
> >>
> >> +    // TODO: REMOVE - Remove when class path scanning is implemented.
> >>     public URL getLocalURL(int index, String urlPath)
> >>     {
> >>         if (urlPath.startsWith("/"))
> >>
> >> Modified:
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/URLHandlersBundleURLConnection.java
> >> URL:
> >>
> http://svn.apache.org/viewvc/felix/trunk/framework/src/main/java/org/apache/felix/framework/URLHandlersBundleURLConnection.java?rev=1005843&r1=1005842&r2=1005843&view=diff
> >>
> >>
> ==============================================================================
> >> ---
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/URLHandlersBundleURLConnection.java
> >> (original)
> >> +++
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/URLHandlersBundleURLConnection.java
> >> Fri Oct  8 14:22:39 2010
> >> @@ -28,7 +28,7 @@ import org.apache.felix.framework.resolv
> >>
> >>  import org.apache.felix.framework.util.Util;
> >>
> >> -public class URLHandlersBundleURLConnection extends URLConnection
> >> +class URLHandlersBundleURLConnection extends URLConnection
> >>  {
> >>     private Felix m_framework;
> >>     private Module m_targetModule;
> >> @@ -201,7 +201,8 @@ public class URLHandlersBundleURLConnect
> >>      *
> >>      * @return the local URL
> >>      */
> >> -    public URL getLocalURL()
> >> +    // TODO: REMOVE - Remove when class path scanning is implemented.
> >> +    URL getLocalURL()
> >>     {
> >>         if ((m_targetModule == null) || (m_classPathIdx < 0))
> >>         {
> >>
> >> Modified:
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/cache/ContentDirectoryContent.java
> >> URL:
> >>
> http://svn.apache.org/viewvc/felix/trunk/framework/src/main/java/org/apache/felix/framework/cache/ContentDirectoryContent.java?rev=1005843&r1=1005842&r2=1005843&view=diff
> >>
> >>
> ==============================================================================
> >> ---
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/cache/ContentDirectoryContent.java
> >> (original)
> >> +++
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/cache/ContentDirectoryContent.java
> >> Fri Oct  8 14:22:39 2010
> >> @@ -82,6 +82,7 @@ public class ContentDirectoryContent imp
> >>         return m_content.getEntryAsStream(m_rootPath + name);
> >>     }
> >>
> >> +    // TODO: REMOVE - Remove when class path scanning is implemented.
> >>     public URL getEntryAsURL(String name)
> >>     {
> >>         return m_content.getEntryAsURL(m_rootPath + name);
> >>
> >> Modified:
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/cache/DirectoryContent.java
> >> URL:
> >>
> http://svn.apache.org/viewvc/felix/trunk/framework/src/main/java/org/apache/felix/framework/cache/DirectoryContent.java?rev=1005843&r1=1005842&r2=1005843&view=diff
> >>
> >>
> ==============================================================================
> >> ---
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/cache/DirectoryContent.java
> >> (original)
> >> +++
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/cache/DirectoryContent.java
> >> Fri Oct  8 14:22:39 2010
> >> @@ -133,6 +133,7 @@ public class DirectoryContent implements
> >>         return new FileInputStream(new File(m_dir, name));
> >>     }
> >>
> >> +    // TODO: REMOVE - Remove when class path scanning is implemented.
> >>     public URL getEntryAsURL(String name)
> >>     {
> >>         if ((name.length() > 0) && (name.charAt(0) == '/'))
> >>
> >> Modified:
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/cache/JarContent.java
> >> URL:
> >>
> http://svn.apache.org/viewvc/felix/trunk/framework/src/main/java/org/apache/felix/framework/cache/JarContent.java?rev=1005843&r1=1005842&r2=1005843&view=diff
> >>
> >>
> ==============================================================================
> >> ---
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/cache/JarContent.java
> >> (original)
> >> +++
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/cache/JarContent.java
> >> Fri Oct  8 14:22:39 2010
> >> @@ -192,6 +192,7 @@ public class JarContent implements Conte
> >>         return is;
> >>     }
> >>
> >> +    // TODO: REMOVE - Remove when class path scanning is implemented.
> >>     public URL getEntryAsURL(String name)
> >>     {
> >>         try
> >>
> >> Modified:
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/resolver/Content.java
> >> URL:
> >>
> http://svn.apache.org/viewvc/felix/trunk/framework/src/main/java/org/apache/felix/framework/resolver/Content.java?rev=1005843&r1=1005842&r2=1005843&view=diff
> >>
> >>
> ==============================================================================
> >> ---
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/resolver/Content.java
> >> (original)
> >> +++
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/resolver/Content.java
> >> Fri Oct  8 14:22:39 2010
> >> @@ -120,5 +120,6 @@ public interface Content
> >>      * @return A URL using a standard protocol such as file, jar
> >>      *           or null if not possible.
> >>      */
> >> +    // TODO: REMOVE - Remove when class path scanning is implemented.
> >>     URL getEntryAsURL(String name);
> >>  }
> >> \ No newline at end of file
> >>
> >> Modified:
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/resolver/Module.java
> >> URL:
> >>
> http://svn.apache.org/viewvc/felix/trunk/framework/src/main/java/org/apache/felix/framework/resolver/Module.java?rev=1005843&r1=1005842&r2=1005843&view=diff
> >>
> >>
> ==============================================================================
> >> ---
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/resolver/Module.java
> >> (original)
> >> +++
> >>
> felix/trunk/framework/src/main/java/org/apache/felix/framework/resolver/Module.java
> >> Fri Oct  8 14:22:39 2010
> >> @@ -72,5 +72,6 @@ public interface Module
> >>         throws IOException;
> >>     InputStream getInputStream(int index, String urlPath)
> >>         throws IOException;
> >> +    // TODO: REMOVE - Remove when class path scanning is implemented.
> >>     URL getLocalURL(int index, String urlPath);
> >>  }
> >> \ No newline at end of file
> >>
> >>
> >>
> >
> >
>


-- 
Cheers,
Guillaume Nodet
------------------------
Blog: http://gnodet.blogspot.com/
------------------------
Open Source SOA
http://fusesource.com

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