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Interface java.rmi.activation.ActivationSystem


public interface ActivationSystem
extends Remote
The ActivationSystem provides a means for registering groups and "activatable" objects to be activated within those groups. The ActivationSystem works closely with the Activator, which activates objects registered via the ActivationSystem, and the ActivationMonitor, which obtains information about active and inactive objects, and inactive groups.

Since:
JDK1.2
See Also:
Activator, ActivationMonitor

Field Summary
static int  SYSTEM_PORT
The port to lookup the activation system
 

Method Summary
ActivationMonitor  activeGroup(ActivationGroupID id, ActivationInstantiator group, long incarnation)
Callback to inform activation system that group is now active.
ActivationGroupID  registerGroup(ActivationGroupDesc desc)
Register the activation group.
ActivationID  registerObject(ActivationDesc desc)
The registerObject method is used to register an activation descriptor, desc, and obtain an activation identifier for a activatable remote object.
void  shutdown()
Shutdown the activation system.
void  unregisterGroup(ActivationGroupID id)
Remove the activation group.
void  unregisterObject(ActivationID id)
Remove the activation id and associated descriptor previously registered with the ActivationSystem; the object can no longer be activated via the object's activation id.
 

Field Detail

SYSTEM_PORT

public static final int SYSTEM_PORT
The port to lookup the activation system
Method Detail

registerObject

public ActivationID registerObject(ActivationDesc desc) throws ActivationException, UnknownGroupException, RemoteException
The registerObject method is used to register an activation descriptor, desc, and obtain an activation identifier for a activatable remote object. The ActivationSystem creates an ActivationID (a activation identifier) for the object specified by the descriptor, desc, and records, in stable storage, the activation descriptor and its associated identifier for later use. When the Activator receives an activate request for a specific identifier, it looks up the activation descriptor (registered previously) for the specified identifier and uses that information to activate the object.

Parameters:
desc - the object's activation descriptor
Returns:
the activation id that can be used to activate the object
Throws:
ActivationException - if registration fails (e.g., database update failure, etc).
UnknownGroupException - if group referred to in desc is not registered with this system
RemoteException - if remote call fails

unregisterObject

public void unregisterObject(ActivationID id) throws ActivationException, UnknownObjectException, RemoteException
Remove the activation id and associated descriptor previously registered with the ActivationSystem; the object can no longer be activated via the object's activation id.
Parameters:
id - the object's activation id (from previous registration)
Throws:
ActivationException - if unregister fails (e.g., database update failure, etc).
UnknownObjectException - if object is unknown (not registered)
RemoteException - if remote call fails

registerGroup

public ActivationGroupID registerGroup(ActivationGroupDesc desc) throws ActivationException, RemoteException
Register the activation group. An activation group must be registered with the ActivationSystem before objects can be registered within that group.
Parameters:
desc - the group's descriptor
Returns:
an identifier for the group
Throws:
ActivationException - if group registration fails
RemoteException - if remote call fails

activeGroup

public ActivationMonitor activeGroup(ActivationGroupID id,
                                     ActivationInstantiator group,
                                     long incarnation) throws UnknownGroupException, ActivationException, RemoteException
Callback to inform activation system that group is now active. This call is made internally by the ActivationGroup.createGroup method to inform the ActivationSystem that the group is now active.
Parameters:
id - the activation group's identifier
group - the group's instantiator
incarnation - the group's incarnation number
Throws:
UnknownGroupException - if group is not registered
ActivationException - if group is already active
RemoteException - if remote call fails

unregisterGroup

public void unregisterGroup(ActivationGroupID id) throws ActivationException, UnknownGroupException, RemoteException
Remove the activation group. An activation group makes this call back to inform the activator that the group should be removed (destroyed). If this call completes successfully, objects can no longer be registered or activated within the group. All information of the group and its associated objects is removed from the system.
Parameters:
id - the activation group's identifier
Throws:
ActivationException - if unregister fails (e.g., database update failure, etc).
UnknownGroupException - if group is not registered
RemoteException - if remote call fails

shutdown

public void shutdown() throws RemoteException
Shutdown the activation system. Destroys all groups spawned by the activation daemon and exits the activation daemon.

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