Interface ComponentInstantiatorSource
- All Known Implementing Classes:
ComponentInstantiatorSourceImpl
@UsesMappedConfiguration(key=java.lang.String.class,
value=ControlledPackageType.class)
public interface ComponentInstantiatorSource
Creates
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 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.
Starting in Tapestry 5.3, the packages that are loaded are controlled by a configuration that maps package names to
ControlledPackageType
s.-
Method Summary
Modifier and TypeMethodDescriptionboolean
Checks to see if a fully qualified class name exists.void
Forces invalidation logic, as if a component class on the disk had changed, forcing a reload of all pages and components.getInstantiator
(String classname) Given the name of a component class, provides an instantiator for that component.Returns a proxy factory that can be used to generate additional classes around enhanced classes, or create subclasses of enhanced classes.
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Method Details
-
getInstantiator
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)- Returns:
- an object which can instantiate an instance of the component
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exists
Checks to see if a fully qualified class name exists. This method appears to exist only for testing.- Parameters:
className
- name of class to check- Returns:
- true if the class exists (there's a ".class" file), false otherwise
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getProxyFactory
Returns a proxy factory that can be used to generate additional classes around enhanced classes, or create subclasses of enhanced classes.- Since:
- 5.3
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forceComponentInvalidation
void forceComponentInvalidation()Forces invalidation logic, as if a component class on the disk had changed, forcing a reload of all pages and components.- Since:
- 5.3
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