Module java.rmi
Package java.rmi.activation

Class ActivationGroupDesc

java.lang.Object
java.rmi.activation.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

  • Constructor Details

    • 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

  • Method Details

    • 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