Re: [platform-core-dev] setURLStreamHandlerFactory

[Dorian Birsan <birsan@xxxxxxxxxx>]

Yes, the configurator is creating a
platform: URL from string, but this should be rewritten.
It would be nice if eclipse did not
set a URL stream handler. This would be a first step to allowing (headless)
eclipse be embedded in a webapp. Another useful thing is having the ability
to pass down the webapp class loader to eclipse, so all the bundle class
loaders are parented by that of the webapp container.

-Dorian

Thomas Watson <tjwatson@xxxxxxxxxx>
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06/17/2004 05:06 PM

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Subject	Re: [platform-core-dev] setURLStreamHandlerFactory

Dorian, 

You are correct.  For some reason I thought the public handler was
accessed again in this scenario.  But there are other scenarios where
plugins may construct a URL from a string.  I pretty sure some plugins
are doing this with the platform: protocol.  I know that update configurator
is using the public reference: protocol handler to construct URLs from
strings to install bundles into the framework.  So the way we do reference
installs would have to be redone without this support.

Thomas Watson

Dorian Birsan <birsan@xxxxxxxxxx> Sent by: platform-core-dev-admin@xxxxxxxxxxx 06/17/2004 03:37 PM Please respond to platform-core-dev

To:        platform-core-dev@xxxxxxxxxxx        cc:                Subject:        Re: [platform-core-dev] setURLStreamHandlerFactory

So, when "buttonImage" is constructed, isn't it inheriting the
handler from "images"  (which would be the private osgi
URL stream handler) ? 

-Dorian

Thomas Watson <tjwatson@xxxxxxxxxx>
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06/17/2004 04:14 PM

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Subject	Re: [platform-core-dev] setURLStreamHandlerFactory

We have lots of usecases where plugins are given a URL from either an OSGi
API or eclipse runtime API and then use these URL's as a context to another
URL.  For example: 

URL images = bundle.getEntry("images/");
URL buttonImage = new URL(images, "button.jpg");

To support these types of scenarios we must provide public protocols.

Thomas Watson

Dorian Birsan <birsan@xxxxxxxxxx> Sent by: platform-core-dev-admin@xxxxxxxxxxx 06/17/2004 02:53 PM Please respond to platform-core-dev

To:        platform-core-dev@xxxxxxxxxxx      cc:              Subject:        Re: [platform-core-dev] setURLStreamHandlerFactory

Are those protocols public? If they are for internal purposes only, then
clients would not create such URL from a string, but will only pass already
created (by the framework) URL's around. 
In that case, the osgi implementation could create URL's using this constructor:
URL(String protocol, String host, int port, String file,  URLStreamHandler
handler), by passing the appropriate factory. 

-Dorian

Thomas Watson <tjwatson@xxxxxxxxxx>
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06/17/2004 03:41 PM

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Subject	Re: [platform-core-dev] setURLStreamHandlerFactory

Marius, 

Unfortunately there is no way of preventing the Framework from calling
these methods.  The URL HandlerFactories must be set by the Framework
to support the OSGi URLStreamHandlerService.  The eclipse runtime
depends on the URLStreamHandlerService to support all of its protocol handlers
(i.e. platform: bundleentry: bundleresource: ect.).  Without support
for these protocol handlers eclipse will not work.  The URLStreamHandlerService
allows plugins within the Framework to dynamically add and remove protocol
handlers in the runtime environment. 

Thomas Watson

"Marius Gleeson" <platform-core-dev@xxxxxxxxxxxxxx> Sent by: platform-core-dev-admin@xxxxxxxxxxx 06/17/2004 02:12 AM Please respond to platform-core-dev

To:        platform-core-dev@xxxxxxxxxxx    cc:            Subject:        [platform-core-dev] setURLStreamHandlerFactory

Hi there,

Is there any way of stopping the framework from calling the 
URL.setURLStreamHandlerFactory(URLStreamHandlerFactory fac) and
URLConnection.setContentHandlerFactory(ContentHandlerFactory fac)
methods ?

I have a tricky situation where I need to launch eclipse from within
another third party app which also calls these methods. Of course when
eclipse tries to set them an Error is thrown and the whole thing
crumbles.

Any ideas?
thanks,
Marius


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