Hi,
I'm developing Tapestry 5 base on osgi environment recently and it's almost
done at this time but 3 problems:
First, I have to show you how tapestry-osgi works in shortly:
tapestry-osgi is suported by 2 bundles:
*org.extwind.osgi.http.filter* - Register FilterService as osgi service,
like HttpService
*org.extwind.osgi.tapestry* - Register TapestryFilter by FilterService,
and register ComponentService as osgi service.
The ComponentService is used to register/unregister a root package of module
(bundle) into Tapestry dynamically
public interface ComponentService {
public void registerPackage(String packageName);
public void unregisterPackage(String packageName);
}
Override ComponentClassResolver to finding page/component/minix class and
mapping page/component/minix name, to locate class and resources, need a
ComponentLocator
public interface ComponentLocatorRegistry {
public void register(String packageName, ComponentLocator pageLocator);
public void unregister(String packageName);
}
Every component bundles which would like to register a package into tapestry
will be associated to a ComponentLocator, so tapestry can find resources
from them.
The global AppModule is located in bundle org.extwind.osgi.tapestry to
override services.
*1. case-insensitive*
As we know, java is a case-sensitive world,, I really can't make sense why
tapestry built with case-insensitive.
But it's not a major problem with osgi, I just per-loading tapestry's
componets at the time when bundle startup, like following:
*TapestryConstants.java*
static final Collection<String> TAPESTRY_PAGES_CLASSES = new
ArrayList<String>(3);
static final Collection<String> TAPESTRY_COMPONENTS_CLASSES = new
ArrayList<String>(44);
static final Collection<String> TAPESTRY_MIXINS_CLASSES = new
ArrayList<String>(70);
static final String ROOT_PACKAGE = "org.apache.tapestry5.corelib";
static final String PATH_PREFIX= "core";
static {
// Pages
TAPESTRY_PAGES_CLASSES.add("org.apache.tapestry5.corelib.pages.ExceptionReport");
.............. and more
*2. controlledPackageNames*
I can't remove packages from controlledPackageNames when component bundles
stop until get any supported method from ComponentInstantiatorSource such
like
void removePackage(String packageName);
*3. Service binding*
This is a major problem with osgi.
I just researched how tapestry's service binding, if any chance to provide a
way to add modules in Registry or something else like following:
addModules(Collection<ModuleDef> moduleDefs, ...)
Registry can be hold in *org.extwind.osgi.tapestry* to accept modules
registered by components bundles dynamically, through override
TapestryFilter.init(Registry) like following:
FilterService filterService = (FilterService) context.getService(reference);
Dictionary<String, String> dic = new Hashtable<String, String>();
dic.put(InternalConstants.TAPESTRY_APP_PACKAGE_PARAM,
"org.extwind.osgi.tapestry");
dic.put("filter-name", "app");
filterService.registerFilter("/*", new TapestryFilter() {
protected void init(Registry registry) throws ServletException {
ComponentLocatorRegistry componentLocatorRegistry =
AppModule.getPageLocatorRegistry();
pageServiceRegistration =
context.registerService(ComponentService.class.getName(),
new ComponentServiceListener(componentLocatorRegistry, registry),
null);
}
}, dic, null);
...... and more
Get source code of tapestry-osgi from
http://extwind.googlecode.com/svn/trunk/Tapestry-OSGi/
And also Tomcat-OSGi is on programming if any interestings to you,
documents are all in Chinese and translating to English.
Appreciates for any suggestions.
Regards,
Donf Yang
------------------------------------------------------------------------------
To be surprised,to wonder,is to begin to understand.
