ActivationSystem (Java Platform SE 6)

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Java™ Platform
Standard Ed. 6

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java.rmi.activation
Interface ActivationSystem

All Superinterfaces:: Remote

public interface ActivationSystem
extends Remote
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
`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.
`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)