Java™ Platform
Standard Ed. 6

org.omg.PortableServer
Class Servant

java.lang.Object
  extended by org.omg.PortableServer.Servant
Direct Known Subclasses:
BindingIteratorPOA, DynamicImplementation, NamingContextExtPOA, NamingContextPOA, ServantActivatorPOA, ServantLocatorPOA

public abstract class Servant
extends Object

Defines the native Servant type. In Java, the Servant type is mapped to the Java org.omg.PortableServer.Servant class. It serves as the base class for all POA servant implementations and provides a number of methods that may be invoked by the application programmer, as well as methods which are invoked by the POA itself and may be overridden by the user to control aspects of servant behavior. Based on IDL to Java spec. (CORBA V2.3.1) ptc/00-01-08.pdf.


Constructor Summary
Servant()
           
 
Method Summary
abstract  String[] _all_interfaces(POA poa, byte[] objectId)
          Used by the ORB to obtain complete type information from the servant.
 POA _default_POA()
          Returns the root POA from the ORB instance associated with the servant.
 Delegate _get_delegate()
          Gets the ORB vendor-specific implementation of PortableServer::Servant.
 Object _get_interface_def()
          Returns an InterfaceDef object as a CORBA::Object that defines the runtime type of the CORBA::Object implemented by the Servant.
 boolean _is_a(String repository_id)
          Checks to see if the specified repository_id is present on the list returned by _all_interfaces() or is the repository_id for the generic CORBA Object.
 boolean _non_existent()
          Checks for the existence of an Object.
 byte[] _object_id()
          Allows easy execution of common methods, equivalent to calling PortableServer::Current::get_object_id.
 ORB _orb()
          Returns the instance of the ORB currently associated with the Servant (convenience method).
 POA _poa()
          Allows easy execution of common methods, equivalent to PortableServer::Current:get_POA.
 void _set_delegate(Delegate delegate)
          Supports the Java ORB portability interfaces by providing a method for classes that support ORB portability through delegation to set their delegate.
 Object _this_object()
          Allows the servant to obtain the object reference for the target CORBA object it is incarnating for that request.
 Object _this_object(ORB orb)
          Allows the servant to obtain the object reference for the target CORBA Object it is incarnating for that request.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

Servant

public Servant()
Method Detail

_get_delegate

public final Delegate _get_delegate()
Gets the ORB vendor-specific implementation of PortableServer::Servant.

Returns:
_delegate the ORB vendor-specific implementation of PortableServer::Servant.

_set_delegate

public final void _set_delegate(Delegate delegate)
Supports the Java ORB portability interfaces by providing a method for classes that support ORB portability through delegation to set their delegate.

Parameters:
delegate - ORB vendor-specific implementation of the PortableServer::Servant.

_this_object

public final Object _this_object()
Allows the servant to obtain the object reference for the target CORBA object it is incarnating for that request.

Returns:
this_object Object reference associated with the request.

_this_object

public final Object _this_object(ORB orb)
Allows the servant to obtain the object reference for the target CORBA Object it is incarnating for that request.

Parameters:
orb - ORB with which the servant is associated.
Returns:
_this_object reference associated with the request.

_orb

public final ORB _orb()
Returns the instance of the ORB currently associated with the Servant (convenience method).

Returns:
orb the instance of the ORB currently associated with the Servant.

_poa

public final POA _poa()
Allows easy execution of common methods, equivalent to PortableServer::Current:get_POA.

Returns:
poa POA associated with the servant.

_object_id

public final byte[] _object_id()
Allows easy execution of common methods, equivalent to calling PortableServer::Current::get_object_id.

Returns:
object_id the Object ID associated with this servant.

_default_POA

public POA _default_POA()
Returns the root POA from the ORB instance associated with the servant. Subclasses may override this method to return a different POA.

Returns:
default_POA the POA associated with the Servant.

_is_a

public boolean _is_a(String repository_id)
Checks to see if the specified repository_id is present on the list returned by _all_interfaces() or is the repository_id for the generic CORBA Object.

Parameters:
repository_id - the repository_id to be checked in the repository list or against the id of generic CORBA objects.
Returns:
is_a boolean indicating whether the specified repository_id is in the repository list or is same as a generic CORBA object.

_non_existent

public boolean _non_existent()
Checks for the existence of an Object. The Servant provides a default implementation of _non_existent() that can be overridden by derived servants.

Returns:
non_existent true if that object does not exist, false otherwise.

_get_interface_def

public Object _get_interface_def()
Returns an InterfaceDef object as a CORBA::Object that defines the runtime type of the CORBA::Object implemented by the Servant. The invoker of _get_interface_def must narrow the result to an InterfaceDef in order to use it.

This default implementation of _get_interface_def() can be overridden by derived servants if the default behavior is not adequate. As defined in the CORBA 2.3.1 specification, section 11.3.1, the default behavior of _get_interface_def() is to use the most derived interface of a static servant or the most derived interface retrieved from a dynamic servant to obtain the InterfaceDef. This behavior must be supported by the Delegate that implements the Servant.

Returns:
get_interface_def an InterfaceDef object as a CORBA::Object that defines the runtime type of the CORBA::Object implemented by the Servant.

_all_interfaces

public abstract String[] _all_interfaces(POA poa,
                                         byte[] objectId)
Used by the ORB to obtain complete type information from the servant.

Parameters:
poa - POA with which the servant is associated.
objectId - is the id corresponding to the object associated with this servant.
Returns:
list of type information for the object.

Java™ Platform
Standard Ed. 6

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