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Package org.omg.PortableServer

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

See:
          Description

Interface Summary
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
_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
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:

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:

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:

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:

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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