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Posted to users@tapestry.apache.org by Eduardo Lobo <el...@inet.co.cr> on 2005/04/27 20:06:35 UTC
Re: How to load .page files at runtime...
Originally I had a problem to load specification files(.page) at runtime
located in external JAR files.
Finally I found a solution by myself, if somebody is interested in it
here is.
First, you must extends the ApplicationServlet class overloading the
createResourceResolver() method to return your own IResourceResolver
implementation.
(Of course you must use this new servlet class for your Tapestry
application).
<!-- Sample -->
<servlet>
<servlet-name>app</servlet-name>
<servlet-class>com.project.web.SiteManagerServlet</servlet-class>
</servlet>
Here is my IResourceResolver implementation:
public class MyResourceResolver extends DefaultResourceResolver {
private ClassLoader currentLoader;
private ClassLoader parentLoader;
public MyResourceResolver () {
currentLoader = Thread.currentThread().getContextClassLoader();
parentLoader =
Thread.currentThread().getContextClassLoader().getParent();
}
public MyResourceResolver (ClassLoader loader) {
currentLoader = loader;
parentLoader = loader.getParent();
}
public URL getResource(String name){
String stripped = removeLeadingSlash(name);
URL result = currentLoader.getResource(stripped);
if(result == null){
result = parentLoader.getResource(stripped);
}
return result;
}
private String removeLeadingSlash(String name){
while (name.startsWith("/")) {
return name.substring(1);
}
return name;
}
public Class findClass(String name)
{
try
{
Class clazz = Class.forName(name, true, currentLoader);
if(clazz == null){
clazz = Class.forName(name, true, parentLoader);
}
return clazz;
}
catch (Throwable t)
{
throw new ApplicationRuntimeException(
Tapestry.format("ResourceResolver.unable-to-load-class",
name, currentLoader, t.getMessage()),
t);
}
}
public Class classForName(String name, Map map) throws
ClassNotFoundException
{
return findClass(name);
}
public ClassLoader getClassLoader()
{
return currentLoader;
}
}
Library file sample (external JAR):
<library-specification>
<page name="SamplePage" specification-path="SamplePage.page"/>
.....
<library-specification>
Loader:
ISpecificationSource spec = getEngine().getSpecificationSource();
IApplicationSpecification app = getEngine().getSpecification();
IResourceLocation location =
new
ClasspathResourceLocation(getEngine().getResourceResolver(),
"com/project/sample.library");
ILibrarySpecification ls =
getEngine().getSpecificationSource().getLibrarySpecification(location);
INamespace namespace = spec.getApplicationNamespace();
Iterator it = ls.getPageNames().iterator();
while(it.hasNext()){
String name = (String) it.next();
String path = ls.getPageSpecificationPath(name);
try{
IResourceLocation loc =
new
ClasspathResourceLocation(getEngine().getResourceResolver(),
"com/project/" + path); // the .page files
are located in the same package of the .library file
IComponentSpecification component =
getEngine().getSpecificationSource().getPageSpecification(loc);
namespace.installPageSpecification(name, component);
} catch(Exception e){
logger.debug("installing exception: " + e.getMessage());
}
}
Eduardo Lobo wrote:
>
> Hi,
>
> I'm making an application that needs to load war files as plugins for
> the tapestry application to load them without making a new deploy or
> restarting the application server
>
> Does anybody knows how to load pages at runtime, or another way to do
> this?
>
> Thanks in advance.
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: tapestry-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: tapestry-user-help@jakarta.apache.org
>
>
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Re: How to load .page files at runtime...
Posted by Alberto Lepe <al...@gmail.com>.
Hi Eduardo Lobo, I'm interested if you can copy this comment into the
"Howtos" of the forum: http://www.tapestryforums.com/
TapestryForums, was made to keep this kind of good solutions instead
of leaving it as a comment at the mailing list by Tapestry users and
developers and be able to find them faster.
Thank you.
On 4/27/05, Eduardo Lobo <el...@inet.co.cr> wrote:
>
> Originally I had a problem to load specification files(.page) at runtime
> located in external JAR files.
>
> Finally I found a solution by myself, if somebody is interested in it
> here is.
>
> First, you must extends the ApplicationServlet class overloading the
> createResourceResolver() method to return your own IResourceResolver
> implementation.
> (Of course you must use this new servlet class for your Tapestry
> application).
> <!-- Sample -->
> <servlet>
> <servlet-name>app</servlet-name>
> <servlet-class>com.project.web.SiteManagerServlet</servlet-class>
> </servlet>
>
> Here is my IResourceResolver implementation:
>
> public class MyResourceResolver extends DefaultResourceResolver {
>
> private ClassLoader currentLoader;
> private ClassLoader parentLoader;
>
> public MyResourceResolver () {
> currentLoader = Thread.currentThread().getContextClassLoader();
> parentLoader =
> Thread.currentThread().getContextClassLoader().getParent();
> }
>
> public MyResourceResolver (ClassLoader loader) {
> currentLoader = loader;
> parentLoader = loader.getParent();
> }
>
> public URL getResource(String name){
>
> String stripped = removeLeadingSlash(name);
>
> URL result = currentLoader.getResource(stripped);
> if(result == null){
> result = parentLoader.getResource(stripped);
> }
>
> return result;
> }
>
> private String removeLeadingSlash(String name){
>
> while (name.startsWith("/")) {
> return name.substring(1);
> }
>
> return name;
> }
>
> public Class findClass(String name)
> {
> try
> {
> Class clazz = Class.forName(name, true, currentLoader);
> if(clazz == null){
> clazz = Class.forName(name, true, parentLoader);
> }
>
> return clazz;
> }
> catch (Throwable t)
> {
> throw new ApplicationRuntimeException(
> Tapestry.format("ResourceResolver.unable-to-load-class",
> name, currentLoader, t.getMessage()),
> t);
> }
> }
>
> public Class classForName(String name, Map map) throws
> ClassNotFoundException
> {
> return findClass(name);
> }
>
> public ClassLoader getClassLoader()
> {
> return currentLoader;
> }
>
> }
>
> Library file sample (external JAR):
>
> <library-specification>
> <page name="SamplePage" specification-path="SamplePage.page"/>
> .....
> <library-specification>
>
> Loader:
>
> ISpecificationSource spec = getEngine().getSpecificationSource();
> IApplicationSpecification app = getEngine().getSpecification();
>
> IResourceLocation location =
> new
> ClasspathResourceLocation(getEngine().getResourceResolver(),
> "com/project/sample.library");
>
> ILibrarySpecification ls =
> getEngine().getSpecificationSource().getLibrarySpecification(location);
> INamespace namespace = spec.getApplicationNamespace();
>
> Iterator it = ls.getPageNames().iterator();
>
> while(it.hasNext()){
> String name = (String) it.next();
> String path = ls.getPageSpecificationPath(name);
>
> try{
>
> IResourceLocation loc =
> new
> ClasspathResourceLocation(getEngine().getResourceResolver(),
> "com/project/" + path); // the .page files
> are located in the same package of the .library file
>
> IComponentSpecification component =
> getEngine().getSpecificationSource().getPageSpecification(loc);
>
> namespace.installPageSpecification(name, component);
>
> } catch(Exception e){
> logger.debug("installing exception: " + e.getMessage());
> }
> }
>
> Eduardo Lobo wrote:
>
> >
> > Hi,
> >
> > I'm making an application that needs to load war files as plugins for
> > the tapestry application to load them without making a new deploy or
> > restarting the application server
> >
> > Does anybody knows how to load pages at runtime, or another way to do
> > this?
> >
> > Thanks in advance.
> >
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: tapestry-user-unsubscribe@jakarta.apache.org
> > For additional commands, e-mail: tapestry-user-help@jakarta.apache.org
> >
> >
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: tapestry-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: tapestry-user-help@jakarta.apache.org
>
>
---------------------------------------------------------------------
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