Class ActivationGroupDesc

All Implemented Interfaces:
Serializable
public final class ActivationGroupDesc
extends Object
implements Serializable

An activation group descriptor contains the information necessary to create/recreate an activation group in which to activate objects. Such a descriptor contains:

  • the group's class name,
  • the group's code location (the location of the group's class), and
  • a "marshalled" object that can contain group specific initialization data.

The group's class must be a concrete subclass of ActivationGroup. A subclass of ActivationGroup is created/recreated via the ActivationGroup.createGroup static method that invokes a special constructor that takes two arguments:

  • the group's ActivationGroupID, and
  • the group's initialization data (in a java.rmi.MarshalledObject)
Since:
1.2
See Also:
ActivationGroup, ActivationGroupID, Serialized Form

Nested Classes

Modifier and Type Class Description
static class  ActivationGroupDesc.CommandEnvironment

Startup options for ActivationGroup implementations.

Constructors

Constructor Description
ActivationGroupDesc​(String className, String location, MarshalledObject<?> data, Properties overrides, ActivationGroupDesc.CommandEnvironment cmd)

Specifies an alternate group implementation and execution environment to be used for the group.
ActivationGroupDesc​(Properties overrides, ActivationGroupDesc.CommandEnvironment cmd)

Constructs a group descriptor that uses the system defaults for group implementation and code location.

Methods

Modifier and Type Method Description
boolean equals​(Object obj)

Compares two activation group descriptors for content equality.
String getClassName()

Returns the group's class name (possibly null).
ActivationGroupDesc.CommandEnvironment getCommandEnvironment()

Returns the group's command-environment control object.
MarshalledObject<?> getData()

Returns the group's initialization data.
String getLocation()

Returns the group's code location.
Properties getPropertyOverrides()

Returns the group's property-override list.
int hashCode()

Produce identical numbers for similar ActivationGroupDescs.

Methods declared in class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Constructors

ActivationGroupDesc

public ActivationGroupDesc(Properties overrides,
                           ActivationGroupDesc.CommandEnvironment cmd)

Constructs a group descriptor that uses the system defaults for group implementation and code location. Properties specify Java environment overrides (which will override system properties in the group implementation's VM). The command environment can control the exact command/options used in starting the child VM, or can be null to accept rmid's default.

This constructor will create an ActivationGroupDesc with a null group class name, which indicates the system's default ActivationGroup implementation.

Parameters:
overrides - the set of properties to set when the group is recreated.
cmd - the controlling options for executing the VM in another process (or null).
Since:
1.2

ActivationGroupDesc

public ActivationGroupDesc(String className,
                           String location,
                           MarshalledObject<?> data,
                           Properties overrides,
                           ActivationGroupDesc.CommandEnvironment cmd)

Specifies an alternate group implementation and execution environment to be used for the group.

Parameters:
className - the group's package qualified class name or null. A null group class name indicates the system's default ActivationGroup implementation.
location - the location from where to load the group's class
data - the group's initialization data contained in marshalled form (could contain properties, for example)
overrides - a properties map which will override those set by default in the subprocess environment (will be translated into -D options), or null.
cmd - the controlling options for executing the VM in another process (or null).
Since:
1.2

Methods

getClassName

public String getClassName()

Returns the group's class name (possibly null). A null group class name indicates the system's default ActivationGroup implementation.

Returns:
the group's class name
Since:
1.2

getLocation

public String getLocation()

Returns the group's code location.

Returns:
the group's code location
Since:
1.2

getData

public MarshalledObject<?> getData()

Returns the group's initialization data.

Returns:
the group's initialization data
Since:
1.2

getPropertyOverrides

public Properties getPropertyOverrides()

Returns the group's property-override list.

Returns:
the property-override list, or null
Since:
1.2

getCommandEnvironment

public ActivationGroupDesc.CommandEnvironment getCommandEnvironment()

Returns the group's command-environment control object.

Returns:
the command-environment object, or null
Since:
1.2

equals

public boolean equals(Object obj)

Compares two activation group descriptors for content equality.

Overrides:
equals in class Object
Parameters:
obj - the Object to compare with
Returns:
true if these Objects are equal; false otherwise.
Since:
1.2
See Also:
Hashtable

hashCode

public int hashCode()

Produce identical numbers for similar ActivationGroupDescs.

Overrides:
hashCode in class Object
Returns:
an integer
See Also:
Hashtable

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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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https://docs.oracle.com/en/java/javase/11/docs/api/java.rmi/java/rmi/activation/ActivationGroupDesc.html