Interface ActivationInstantiator

All Superinterfaces:
Remote
All Known Implementing Classes:
ActivationGroup, ActivationGroup_Stub 
public interface ActivationInstantiator
extends Remote

An ActivationInstantiator is responsible for creating instances of "activatable" objects. A concrete subclass of ActivationGroup implements the newInstance method to handle creating objects within the group.

Since:
1.2
See Also:
ActivationGroup

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type Method Description
MarshalledObject<? extends Remote> newInstance​(ActivationID id, ActivationDesc desc)

The activator calls an instantiator's newInstance method in order to recreate in that group an object with the activation identifier, id, and descriptor, desc.

Method Detail

newInstance

MarshalledObject<? extends Remote> newInstance​(ActivationID id,
                                               ActivationDesc desc)
                                        throws ActivationException,
                                               RemoteException

The activator calls an instantiator's newInstance method in order to recreate in that group an object with the activation identifier, id, and descriptor, desc. The instantiator is responsible for:

  • determining the class for the object using the descriptor's getClassName method,
  • loading the class from the code location obtained from the descriptor (using the getLocation method),
  • creating an instance of the class by invoking the special "activation" constructor of the object's class that takes two arguments: the object's ActivationID, and the MarshalledObject containing object specific initialization data, and
  • returning a MarshalledObject containing the stub for the remote object it created.

In order for activation to be successful, one of the following requirements must be met, otherwise ActivationException is thrown:

  • The class to be activated and the special activation constructor are both public, and the class resides in a package that is exported to at least the java.rmi module; or
  • The class to be activated resides in a package that is open to at least the java.rmi module.
Parameters:
id - the object's activation identifier
desc - the object's descriptor
Returns:
a marshalled object containing the serialized representation of remote object's stub
Throws:
ActivationException - if object activation fails
RemoteException - if remote call fails
Since:
1.2