Java Module java.rmi Package java.rmi.activation Interface ActivationSystem（JDK11）

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All Superinterfaces:
Remote
```
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:
1.2
See Also:
Activator, ActivationMonitor

Field Summary
Fields
Modifier and Type Field Description
static int SYSTEM_PORT
The port to lookup the activation system.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`ActivationMonitor`	`activeGroup(ActivationGroupID id, ActivationInstantiator group, long incarnation)`	Callback to inform activation system that group is now active.
`ActivationDesc`	`getActivationDesc(ActivationID id)`	Returns the activation descriptor, for the object with the activation identifier, `id`.
`ActivationGroupDesc`	`getActivationGroupDesc(ActivationGroupID id)`	Returns the activation group descriptor, for the group with the activation group identifier, `id`.
`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.
`ActivationDesc`	`setActivationDesc(ActivationID id, ActivationDesc desc)`	Set the activation descriptor, `desc` for the object with the activation identifier, `id`.
`ActivationGroupDesc`	`setActivationGroupDesc(ActivationGroupID id, ActivationGroupDesc desc)`	Set the activation group descriptor, `desc` for the object with the activation group identifier, `id`.
`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
```
static final int SYSTEM_PORT
```
    The port to lookup the activation system.
    See Also:
    Constant Field Values
- Method Detail
  - registerObject
```
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
    Since:
    1.2
  - unregisterObject
```
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
    Since:
    1.2
  - registerGroup
```
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
    Since:
    1.2
  - activeGroup
```
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
    Returns:
    monitor for activation group
    Throws:
    UnknownGroupException - if group is not registered
    ActivationException - if a group for the specified id is already active and that group is not equal to the specified group or that group has a different incarnation than the specified group
    RemoteException - if remote call fails
    Since:
    1.2
  - unregisterGroup
```
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
    Since:
    1.2
  - shutdown
```
void shutdown()
       throws RemoteException
```
    Shutdown the activation system. Destroys all groups spawned by the activation daemon and exits the activation daemon.
    Throws:
    RemoteException - if failed to contact/shutdown the activation daemon
    Since:
    1.2
  - setActivationDesc
```
ActivationDesc setActivationDesc(ActivationID id,
                                 ActivationDesc desc)
                          throws ActivationException,
                                 UnknownObjectException,
                                 UnknownGroupException,
                                 RemoteException
```
    Set the activation descriptor, desc for the object with the activation identifier, id. The change will take effect upon subsequent activation of the object.
    Parameters:
    id - the activation identifier for the activatable object
    desc - the activation descriptor for the activatable object
    Returns:
    the previous value of the activation descriptor
    Throws:
    UnknownGroupException - the group associated with desc is not a registered group
    UnknownObjectException - the activation id is not registered
    ActivationException - for general failure (e.g., unable to update log)
    RemoteException - if remote call fails
    Since:
    1.2
    See Also:
    getActivationDesc(java.rmi.activation.ActivationID)
  - setActivationGroupDesc
```
ActivationGroupDesc setActivationGroupDesc(ActivationGroupID id,
                                           ActivationGroupDesc desc)
                                    throws ActivationException,
                                           UnknownGroupException,
                                           RemoteException
```
    Set the activation group descriptor, desc for the object with the activation group identifier, id. The change will take effect upon subsequent activation of the group.
    Parameters:
    id - the activation group identifier for the activation group
    desc - the activation group descriptor for the activation group
    Returns:
    the previous value of the activation group descriptor
    Throws:
    UnknownGroupException - the group associated with id is not a registered group
    ActivationException - for general failure (e.g., unable to update log)
    RemoteException - if remote call fails
    Since:
    1.2
    See Also:
    getActivationGroupDesc(java.rmi.activation.ActivationGroupID)
  - getActivationDesc
```
ActivationDesc getActivationDesc(ActivationID id)
                          throws ActivationException,
                                 UnknownObjectException,
                                 RemoteException
```
    Returns the activation descriptor, for the object with the activation identifier, id.
    Parameters:
    id - the activation identifier for the activatable object
    Returns:
    the activation descriptor
    Throws:
    UnknownObjectException - if id is not registered
    ActivationException - for general failure
    RemoteException - if remote call fails
    Since:
    1.2
    See Also:
    setActivationDesc(java.rmi.activation.ActivationID, java.rmi.activation.ActivationDesc)
  - getActivationGroupDesc
```
ActivationGroupDesc getActivationGroupDesc(ActivationGroupID id)
                                    throws ActivationException,
                                           UnknownGroupException,
                                           RemoteException
```
    Returns the activation group descriptor, for the group with the activation group identifier, id.
    Parameters:
    id - the activation group identifier for the group
    Returns:
    the activation group descriptor
    Throws:
    UnknownGroupException - if id is not registered
    ActivationException - for general failure
    RemoteException - if remote call fails
    Since:
    1.2
    See Also:
    setActivationGroupDesc(java.rmi.activation.ActivationGroupID, java.rmi.activation.ActivationGroupDesc)

本文分类：JavaAPI
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Java Module java.rmi Package java.rmi.activation Interface ActivationSystem（JDK11）

Interface ActivationSystem

Field Summary

Method Summary

Field Detail

SYSTEM_PORT

Method Detail

registerObject

unregisterObject

registerGroup

activeGroup

unregisterGroup

shutdown

setActivationDesc

setActivationGroupDesc

getActivationDesc

getActivationGroupDesc