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package java.rmi.activation;

import java.rmi.MarshalledObject;
import java.rmi.Remote;
import java.rmi.RemoteException;

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.
Author: Ann Wollrath
See Also:
Since: 1.2
Deprecated: See the java.rmi.activation package specification for further information.
/** * An <code>ActivationInstantiator</code> is responsible for creating * instances of "activatable" objects. A concrete subclass of * <code>ActivationGroup</code> implements the <code>newInstance</code> * method to handle creating objects within the group. * * @author Ann Wollrath * @see ActivationGroup * @since 1.2 * @deprecated * See the <a href="{@docRoot}/java.rmi/java/rmi/activation/package-summary.html"> * {@code java.rmi.activation}</a> package specification for further information. */
@Deprecated(forRemoval=true, since="15") @SuppressWarnings("removal") public interface ActivationInstantiator extends Remote {
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.
Params:
  • id – the object's activation identifier
  • desc – the object's descriptor
Throws:
Returns:a marshalled object containing the serialized representation of remote object's stub
Since:1.2
/** * The activator calls an instantiator's <code>newInstance</code> * method in order to recreate in that group an object with the * activation identifier, <code>id</code>, and descriptor, * <code>desc</code>. The instantiator is responsible for: <ul> * * <li> determining the class for the object using the descriptor's * <code>getClassName</code> method, * * <li> loading the class from the code location obtained from the * descriptor (using the <code>getLocation</code> method), * * <li> creating an instance of the class by invoking the special * "activation" constructor of the object's class that takes two * arguments: the object's <code>ActivationID</code>, and the * <code>MarshalledObject</code> containing object specific * initialization data, and * * <li> returning a MarshalledObject containing the stub for the * remote object it created.</ul> * * <p>In order for activation to be successful, one of the following requirements * must be met, otherwise {@link ActivationException} is thrown: * * <ul><li>The class to be activated and the special activation constructor are both public, * and the class resides in a package that is * {@linkplain Module#isExported(String,Module) exported} * to at least the {@code java.rmi} module; or * * <li>The class to be activated resides in a package that is * {@linkplain Module#isOpen(String,Module) open} * to at least the {@code java.rmi} module. * </ul> * * @param id the object's activation identifier * @param desc the object's descriptor * @return a marshalled object containing the serialized * representation of remote object's stub * @exception ActivationException if object activation fails * @exception RemoteException if remote call fails * @since 1.2 */
public MarshalledObject<? extends Remote> newInstance(ActivationID id, ActivationDesc desc) throws ActivationException, RemoteException; }