IT. Expert System.

Java Standard Edition (SE)

PortableServer


Package org.omg.PortableServer

Provides classes and interfaces for making the server side of your applications portable across multivendor ORBs.

See: Description

  • Interface Summary 
    Interface Description
    AdapterActivator
    An adapter activator supplies a POA with the ability to create child POAs on demand, as a side-effect of receiving a request that names the child POA (or one of its children), or when find_POA is called with an activate parameter value of TRUE.
    AdapterActivatorOperations
    An adapter activator supplies a POA with the ability to create child POAs on demand, as a side-effect of receiving a request that names the child POA (or one of its children), or when find_POA is called with an activate parameter value of TRUE.
    Current
    The PortableServer::Current interface, derived from CORBA::Current, provides method implementations with access to the identity of the object on which the method was invoked.
    CurrentOperations
    The PortableServer::Current interface, derived from CORBA::Current, provides method implementations with access to the identity of the object on which the method was invoked.
    ID_ASSIGNMENT_POLICY_ID
    org/omg/PortableServer/ID_ASSIGNMENT_POLICY_ID.java .
    ID_UNIQUENESS_POLICY_ID
    org/omg/PortableServer/ID_UNIQUENESS_POLICY_ID.java .
    IdAssignmentPolicy
    IdAssignmentPolicy specifies whether Object Ids in the created POA are generated by the application or by the ORB.
    IdAssignmentPolicyOperations
    IdAssignmentPolicy specifies whether Object Ids in the created POA are generated by the application or by the ORB.
    IdUniquenessPolicy
    The IdUniquenessPolicy specifies whether the servants activated in the created POA must have unique object i identities.
    IdUniquenessPolicyOperations
    The IdUniquenessPolicy specifies whether the servants activated in the created POA must have unique object i identities.
    IMPLICIT_ACTIVATION_POLICY_ID
    org/omg/PortableServer/IMPLICIT_ACTIVATION_POLICY_ID.java .
    ImplicitActivationPolicy
    This policy specifies whether implicit activation of servants is supported in the created POA.
    ImplicitActivationPolicyOperations
    This policy specifies whether implicit activation of servants is supported in the created POA.
    LIFESPAN_POLICY_ID
    org/omg/PortableServer/LIFESPAN_POLICY_ID.java .
    LifespanPolicy
    The LifespanPolicy specifies the lifespan of the objects implemented in the created POA.
    LifespanPolicyOperations
    The LifespanPolicy specifies the lifespan of the objects implemented in the created POA.
    POA
    A POA object manages the implementation of a collection of objects.
    POAManager
    Each POA object has an associated POAManager object.
    POAManagerOperations
    Each POA object has an associated POAManager object.
    POAOperations
    A POA object manages the implementation of a collection of objects.
    REQUEST_PROCESSING_POLICY_ID
    org/omg/PortableServer/REQUEST_PROCESSING_POLICY_ID.java .
    RequestProcessingPolicy
    This policy specifies how requests are processed by the created POA.
    RequestProcessingPolicyOperations
    This policy specifies how requests are processed by the created POA.
    SERVANT_RETENTION_POLICY_ID
    org/omg/PortableServer/SERVANT_RETENTION_POLICY_ID.java .
    ServantActivator
    When the POA has the RETAIN policy it uses servant managers that are ServantActivators.
    ServantActivatorOperations
    When the POA has the RETAIN policy it uses servant managers that are ServantActivators.
    ServantLocator
    When the POA has the NON_RETAIN policy it uses servant managers that are ServantLocators.
    ServantLocatorOperations
    When the POA has the NON_RETAIN policy it uses servant managers that are ServantLocators.
    ServantManager
    A servant manager supplies a POA with the ability to activate objects on demand when the POA receives a request targeted at an inactive object.
    ServantManagerOperations
    A servant manager supplies a POA with the ability to activate objects on demand when the POA receives a request targeted at an inactive object.
    ServantRetentionPolicy
    This policy specifies whether the created POA retains active servants in an Active Object Map.
    ServantRetentionPolicyOperations
    This policy specifies whether the created POA retains active servants in an Active Object Map.
    THREAD_POLICY_ID
    org/omg/PortableServer/THREAD_POLICY_ID.java .
    ThreadPolicy
    The ThreadPolicy specifies the threading model used with the created POA.
    ThreadPolicyOperations
    The ThreadPolicy specifies the threading model used with the created POA.
  • Class Summary 
    Class Description
    _ServantActivatorStub
    When the POA has the RETAIN policy it uses servant managers that are ServantActivators.
    _ServantLocatorStub
    When the POA has the NON_RETAIN policy it uses servant managers that are ServantLocators.
    CurrentHelper
    The PortableServer::Current interface, derived from CORBA::Current, provides method implementations with access to the identity of the object on which the method was invoked.
    DynamicImplementation
    Allows dynamic handling of object invocations.
    ForwardRequestHelper
    org/omg/PortableServer/ForwardRequestHelper.java .
    IdAssignmentPolicyValue
    The IdAssignmentPolicyValue can have the following values.
    IdUniquenessPolicyValue
    IdUniquenessPolicyValue can have the following values.
    ImplicitActivationPolicyValue
    ImplicitActivationPolicyValue has the following semantics.
    LifespanPolicyValue
    The LifespanPolicyValue can have the following values.
    POAHelper
    A POA object manages the implementation of a collection of objects.
    RequestProcessingPolicyValue
    The RequestProcessingPolicyValue can have the following values.
    Servant
    Defines the native Servant type.
    ServantActivatorHelper
    When the POA has the RETAIN policy it uses servant managers that are ServantActivators.
    ServantActivatorPOA
    When the POA has the RETAIN policy it uses servant managers that are ServantActivators.
    ServantLocatorHelper
    When the POA has the NON_RETAIN policy it uses servant managers that are ServantLocators.
    ServantLocatorPOA
    When the POA has the NON_RETAIN policy it uses servant managers that are ServantLocators.
    ServantRetentionPolicyValue
    ServantRetentionPolicyValue can have the following values.
    ThreadPolicyValue
    The ThreadPolicyValue can have the following values.
  • Exception Summary 
    Exception Description
    ForwardRequest
    org/omg/PortableServer/ForwardRequest.java .

Package org.omg.PortableServer Description

Provides classes and interfaces for making the server side of your applications portable across multivendor ORBs.

In Java, Portable Object Adaptor (POA)-based Dynamic Skeleton Interface (DSI) servants inherit from the standard DynamicImplementation class, which inherits from the Servant class. The native Servant type is defined by the PortableServer module for the POA. 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.

Package Specification

For a precise list of supported sections of official OMG specifications with which the Java[tm] Platform, Standard Edition 6 complies, see Official Specifications for CORBA support in Java[tm] SE 6.

POA-related Interfaces

The PortableServer module defines the following POA-related interfaces:

  • POA
  • POAManager
  • ServantManager
  • ServantActivator
  • ServantLocator
  • AdapterActivator
  • ThreadPolicy
  • LifespanPolicy
  • IdUniquenessPolicy
  • IdAssignmentPolicy
  • ImplicitActivationPolicy
  • ServantRetentionPolicy
  • RequestProcessingPolicy
  • Current

In addition, the POA defines the Servant native type.

Operations classes

Each of the interfaces listed above has an associated Operations interface. The Operations interface is generated by the idlj compiler and contains the method signatures for methods defined in its associated interface. The Operations interface can be accessed by both the client and the server, while its associated interface can only be called by the client.

Value Classes

Classes ending in the suffix PolicyValue provide the values used for the create_POA call, which sets the policy for the POA. See the sample code below for a demonstration. PolicyValue files include the following:

  • IdAssignmentPolicyValue
  • IdUniquenessPolicyValue
  • ImplicitActivationPolicyValue
  • LifespanPolicyValue
  • RequestProcessingPolicyValue
  • ServantRetentionPolicyValue
  • ThreadPolicyValue

Helper Classes

Helper classes, which are generated for all user-defined types in an OMG IDL interface, supply static methods needed to manipulate those types. There is only one method in a helper class that an application programmer uses: the narrow method. Only Java interfaces mapped from IDL interfaces will have a helper class that includes a narrow method, so in the PortableServer package, only the following classes have a narrow method:

  • ForwardRequestHelper
  • ServantActivatorHelper
  • ServantLocatorHelper

POA Classes

POA classes are used to implement the ServantActivator or ServantLocator.

Exceptions

The ForwardRequest exception indicates to the ORB that it is responsible for delivering the current request and subsequent ForwardRequest requests to the object denoted in the forward_reference member of the exception.

Interfaces Implemented by the Application Programmer

Most of what PortableServer does is transparent to the user. The result is that programmers will use only a few of the interfaces mentioned above. The remaining interfaces will be provided by the ORB implementation. The interfaces of interest to application programmers are the following:

  • AdapterActivator

    Adapter activators are associated with POAs. An adapter activator supplies a POA with the ability to create child POAs on demand, as a side-effect of receiving a request that names the child POA (or one of its children), or when find_POA is called with an activate parameter value of TRUE. An application server that creates all its needed POAs at the beginning of execution does not need to use or provide an adapter activator; it is necessary only for the case in which POAs need to be created during request processing.

  • ServantLocator

    When the POA has the NON_RETAIN policy, it uses servant managers that are ServantLocators.

  • ServantActivator

    When the POA has the RETAIN policy, it uses servant managers that are ServantActivators.

Package org.omg.PortableServer.ServantLocatorPackage

This package supplies a CookieHolder class for passing the Cookie type as an out parameter. The CookieHolder class follows exactly the same pattern as the other holder classes for basic types.

Related Documentation

For an overview of Java IDL, please see:

  • Java IDL home page.

    Example Code

    Example Server Code

    import javax.naming.InitialContext;
    import javax.naming.Context;
    import javax.rmi.PortableRemoteObject ;
    import com.sun.corba.se.impl.poa.POAORB;
    import org.omg.PortableServer.*;
    import java.util.*;
    import org.omg.CORBA.*;
    import javax.rmi.CORBA.Stub;
    import javax.rmi.CORBA.Util;
    
    
    
    public class HelloServer {
        public HelloServer(String[] args) {
            try {
                Properties p = System.getProperties();
             //   p.put("org.omg.CORBA.ORBClass", "com.sun.corba.ee.internal.POA.POAORB");
                ORB orb = ORB.init( args, p );
    
                POA rootPOA = (POA)orb.resolve_initial_references("RootPOA");
    
                Policy[] tpolicy = new Policy[3];
                tpolicy[0] = rootPOA.create_lifespan_policy(
                    LifespanPolicyValue.TRANSIENT );
                tpolicy[1] = rootPOA.create_request_processing_policy(
                    RequestProcessingPolicyValue.USE_ACTIVE_OBJECT_MAP_ONLY );
                tpolicy[2] = rootPOA.create_servant_retention_policy(
                    ServantRetentionPolicyValue.RETAIN);
                POA tpoa = rootPOA.create_POA("MyTransientPOA", null, tpolicy);
    
    
                String  ObjectId = "MyObjectId";
                byte[] oid = ObjectId.getBytes();
    
                org.omg.CORBA.Object obj = tpoa.create_reference_with_id(oid,
                    new _HelloImpl_Tie()._all_interfaces(tpoa, oid)[0]);
                HelloInterface helloRef = (HelloInterface)PortableRemoteObject.narrow(
                    obj, HelloInterface.class );
    
                Context initialNamingContext = new InitialContext();
                initialNamingContext.rebind("HelloService", helloRef);
                System.out.println("Hello Server: Ready...");
                orb.run();
             } catch (Exception e) {
                System.out.println("Trouble: " + e);
                e.printStackTrace();
             } 
         }
    
    
         public static void main(String args[]) {
             new HelloServer( args );
         }
    }
    
    
    

  • Since:
    1.4


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