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package org.glassfish.hk2.api;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.List;
import java.util.Set;
/**
* An ActiveDescriptor contains information about a Descriptor after it has been reified.
* Most of the methods in an ActiveDescriptor cannot be called until the isReified method
* return true. Prior to that the information is not yet known. ActiveDescriptors
* can be reified with the {@link ServiceLocator}.reifyDescriptor method.
*
* ActiveDescriptors may also be provided to the system pre-reified, which is useful
* when the Service described may be produced by a third-party system. In this case
* the ActiveDescriptors create method must use the third-party system in order to
* create instances of the described service
*
* @author jwells
*
* @param This is the type produced by the cache and consumed by the cache
*/
public interface ActiveDescriptor extends Descriptor, SingleCache {
/**
* This method returns true if this descriptor has been reified
* (class loaded). If this method returns false then the other methods
* in this interface will throw an IllegalStateException. Once this
* method returns true it may be
*
* @return true if this descriptor has been reified, false otherwise
*/
public boolean isReified();
/**
* The implementation class that should be used
* to generate new instances of this descriptor.
*
* If the class returned is a Factory, then the
* factory is used to create instances. In this case
* the system will get an instance of the factory and
* use it to create the instances
*
* @return The class that directly implements the contract
* types, or the class that is the factory for an object
* that implements the contract types
*/
public Class getImplementationClass();
/**
* The set of types that this ActiveDescriptor must produce.
* These types may be Classes or ParameterizedTypes, and
* may be no other subclass of Type
*
* @return the set of types this ActiveDescriptor must implement
* or extend
*/
public Set getContractTypes();
/**
* Returns the scope that this ActiveDescriptor belongs to
*
* @return The scope of this ActiveDescriptor
*/
public Class getScopeAnnotation();
/**
* The full set of qualifiers that this ActiveDescriptor
* provides
*
* @return The set of annotations that this ActiveDescriptor
* provides
*/
public Set getQualifierAnnotations();
/**
* Returns the full list of Injectees this class has. These
* references will be resolved prior to the class being constructed,
* even if these injectees are field or method injectees.
*
* If this descriptor is describing a factory created type then
* this list must have zero length
*
* @return Will not return null, but may return an empty list. The set
* of Injectees that must be resolved before this ActiveDescriptor can
* be constructed
*/
public List getInjectees();
/**
* If this ActiveDescriptor has DescriptorType of PROVIDE_METHOD then
* this field will return the ServiceId of its associated Factory
* service. Otherwise this method should return null
*
* @return The service ID of the associated factory service
*/
public Long getFactoryServiceId();
/**
* If this ActiveDescriptor has DescriptorType of PROVIDE_METHOD then
* this field will return the ServiceId of its associated Factory
* service. Otherwise this method should return null
*
* @return The locator ID of the associated factory service
*/
public Long getFactoryLocatorId();
/**
* Creates an instance of the ActiveDescriptor. All of the
* Injectee's must be created prior to instantiation, and
* associated with the ExtendedProvider so that they can be
* destroyed properly
*
* @param root The root service handle, which can be used
* to associated all the PerLookup objects with this creation
*
* @return An instance of this ActiveDescriptor
*/
public T create(ServiceHandle root);
/**
* Disposes this instance. All the PerLookup objects that
* were created for this instance will be destroyed after this
* object has been destroyed
*
* @param instance The instance to destroy
*/
public void dispose(T instance);
}