Hi Patrick, Am Montag, den 17.09.2007, 14:25 -0500 schrieb Patrick Forhan: > I'm using the ScriptEngineManager API (JSR-223) to discover > ScriptEngines. It does this via the JAR file service provider style: > http://java.sun.com/javase/6/docs/technotes/guides/jar/jar.html#Service%20Provider
IIRC the manager also allows for explicit registration of ScriptEngines. The JAR file service provider stuff is fine for traditional Java applications but does not properly work in OSGi frameworks. Given that your ScriptEngine implementations will come bundleized, I suggest you implement a simple BundleListener in the javafx bundle, which checks newly installed bundles for the respective META-INF/services/javax.script.ScriptEngineFactory entries and manually register the contents with the manager. When the bundle goes away, you unregister the factory. The ScriptEngine bundles would import the JSR-223 API. To instantiate the factories from the bundles, you would use the Bundle.loadClass(String) method of the providing bundle. > So, several bits of classloader magic here: > 1) Finding the ScriptEngineFactory file > 2) Finding the implementation the above points to See above for both, no class loader magic required > 3) finding my scripts I would use a similar approach as above: Define a special Manifest header, which may help locate script files in bundles. As bundles are registered/unregistered the respective locations from the Manifest headers is added or removed from your script locator. This is called the Extender Pattern by Peter Kriens. See [1] and [2] for more information. > 4) finding the scripts in widgets and javafx. I am not actually fluent, how the different script interpreters resolve additional scripts. But given the above mechanism of script registration, you might build a resolver, which might be used by the script interpreters. Best of all: This all should run mostly without any class laoder magic .. except perhaps setting up class loaders such that scripts may resolve classes from bundles in which the scripts are contained... Hope this helps. Regards Felix [1] http://www.osgi.org/blog/2007/02/osgi-extender-model.html [2] http://www.aqute.biz/Snippets/Extender --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
