Java Doc for ComponentInstantiatorSource.java in  » Web-Framework » Tapestry » org » apache » tapestry » internal » services » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » Tapestry » org.apache.tapestry.internal.services 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


org.apache.tapestry.internal.services.ComponentInstantiatorSource

All known Subclasses:   org.apache.tapestry.internal.services.ComponentInstantiatorSourceImpl,
ComponentInstantiatorSource
public interface ComponentInstantiatorSource extends InvalidationEventHub(Code)
Creates org.apache.tapestry.internal.services.Instantiator s for components, based on component class name. This will involve transforming the component's class before it is loaded.

In addition, a source acts as an event hub for org.apache.tapestry.internal.events.InvalidationListener s, so that any information derived from loaded classes can be discarded and rebuilt when classes change.

The strategy used is that when any class (in a controlled package) changes, the entire class loader is discarded, along with any instances derived from those classes. A new class loader is created, and then invalidation events are fired to listeners.





Method Summary
 voidaddPackage(String packageName)
     Adds a controlled package.
 booleanexists(String className)
     Checks to see if a fully qualfied class name exists.
 InstantiatorfindInstantiator(String classname)
     Given the name of a component class, provides an instantiator for that component.
 ClassFactorygetClassFactory()
     Returns a class factory that can be used to generate additional classes around enhanced classes, or create subclasses of enhanced classes.



Method Detail
addPackage
void addPackage(String packageName)(Code)
Adds a controlled package. Only classes within controlled packages are subject to transformation.
Parameters:
  packageName - the package name to add (must not be blank)



exists
boolean exists(String className)(Code)
Checks to see if a fully qualfied class name exists.
Parameters:
  className - name of class to check true if the class exists (there's a ".class" file), false otherwise



findInstantiator
Instantiator findInstantiator(String classname)(Code)
Given the name of a component class, provides an instantiator for that component. Instantiators are cached, so repeated calls to this method with the same class name will return the same instance; however, callers should also be aware that the instantiators may lose validity after an invalidation (caused by changes to external Java class files).
Parameters:
  classname - FQCN to find (and perhaps transform and load) an object which can instantiate an instance of the component



getClassFactory
ClassFactory getClassFactory()(Code)
Returns a class factory that can be used to generate additional classes around enhanced classes, or create subclasses of enhanced classes.



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