org.omg.PortableServer

Class ServantLocatorPOA

java.lang.Object

org.omg.PortableServer.Servant

org.omg.PortableServer.ServantLocatorPOA

All Implemented Interfaces:

InvokeHandler, ServantLocatorOperations, ServantManagerOperations

Direct Known Subclasses:

ServantLocatorPOATie

public abstract class ServantLocatorPOA
extends Servant
implements ServantLocatorOperations, InvokeHandler

When the POA has the NON_RETAIN policy it uses servant managers that are ServantLocators. Because the POA knows that the servant returned by this servant manager will be used only for a single request, it can supply extra information to the servant manager's operations and the servant manager's pair of operations may be able to cooperate to do something different than a ServantActivator. When the POA uses the ServantLocator interface, immediately after performing the operation invocation on the servant returned by preinvoke, the POA will invoke postinvoke on the servant manager, passing the ObjectId value and the Servant value as parameters (among others). This feature may be used to force every request for objects associated with a POA to be mediated by the servant manager.

Constructor Summary

Constructors

Constructor and Description
ServantLocatorPOA()

Method Summary

Modifier and Type	Method and Description
String[]	_all_interfaces(POA poa, byte[] objectId) Used by the ORB to obtain complete type information from the servant.
OutputStream	_invoke(String $method, InputStream in, ResponseHandler $rh) Invoked by the ORB to dispatch a request to the servant.
ServantLocator	_this()
ServantLocator	_this(ORB orb)

Methods inherited from class org.omg.PortableServer.Servant

_default_POA, _get_delegate, _get_interface_def, _is_a, _non_existent, _object_id, _orb, _poa, _set_delegate, _this_object, _this_object

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.omg.PortableServer.ServantLocatorOperations

postinvoke, preinvoke

Constructor Detail

ServantLocatorPOA

public ServantLocatorPOA()

Method Detail

_invoke

public OutputStream _invoke(String $method,
                            InputStream in,
                            ResponseHandler $rh)

Description copied from interface: InvokeHandler

Invoked by the ORB to dispatch a request to the servant. ORB passes the method name, an InputStream containing the marshalled arguments, and a ResponseHandler which the servant uses to construct a proper reply. Only CORBA SystemException may be thrown by this method. The method must return an OutputStream created by the ResponseHandler which contains the marshalled reply. A servant must not retain a reference to the ResponseHandler beyond the lifetime of a method invocation. Servant behaviour is defined as follows:

1. Determine correct method, and unmarshal parameters from InputStream.

2. Invoke method implementation.

3. If no user exception, create a normal reply using ResponseHandler.

4. If user exception occurred, create exception reply using ResponseHandler.

5. Marshal reply into OutputStream returned by ResponseHandler.

6. Return OutputStream to ORB.

Specified by:

_invoke in interface InvokeHandler

Parameters:

$method - The method name.

in - The InputStream containing the marshalled arguments.

$rh - The ResponseHandler which the servant uses to construct a proper reply

Returns:

The OutputStream created by the ResponseHandler which contains the marshalled reply

_all_interfaces

public String[] _all_interfaces(POA poa,
                                byte[] objectId)

Description copied from class: Servant

Used by the ORB to obtain complete type information from the servant.

Specified by:

_all_interfaces in class 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.

_this

public ServantLocator _this()

_this

public ServantLocator _this(ORB orb)