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/* POAOperations.java --

   Copyright (C) 2005, 2006 Free Software Foundation, Inc.

This file is part of GNU Classpath.

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package org.omg.PortableServer;

import org.omg.CORBA.BAD_INV_ORDER;

import org.omg.CORBA.BAD_PARAM;

import org.omg.CORBA.OBJ_ADAPTER;

import org.omg.CORBA.Policy;

import org.omg.CORBA.TRANSIENT;

import org.omg.PortableServer.POAPackage.AdapterAlreadyExists;

import org.omg.PortableServer.POAPackage.AdapterNonExistent;

import org.omg.PortableServer.POAPackage.InvalidPolicy;

import org.omg.PortableServer.POAPackage.NoServant;

import org.omg.PortableServer.POAPackage.ObjectAlreadyActive;

import org.omg.PortableServer.POAPackage.ObjectNotActive;

import org.omg.PortableServer.POAPackage.ServantAlreadyActive;

import org.omg.PortableServer.POAPackage.ServantNotActive;

import org.omg.PortableServer.POAPackage.WrongAdapter;

import org.omg.PortableServer.POAPackage.WrongPolicy;

/**

 * Defines the operations, applicable to the POA.

 *

 * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)

 */

public interface POAOperations

{

  /**

   * Creates a new POA as a child of the target POA.

   *

   * @param child_name the name of the child POA being created.

   * @param manager the manager that will control the new POA. If this parameter

   * is null, a new POA manager is created and associated with the new POA.

   *

   * @param policies the policies, applicable for the parent POA. Policies

   * are <i>not</i> inherited from the parent POA. If some policy type

   * is missing in the array (or the zero size array is passed), the missing

   * policies obtain the default values from the table, specified

   * in the {@link POA} documentation header.

   *

   * @return an newly created POA. The POA will be intially in the holding

   * state and must be activated to start processing requests.

   *

   * @throws AdapterAlreadyExists if the child with the given child_name

   * already exists for the current POA.

   * @throws InvalidPolicy if the policies conflict with each other or are

   * otherwise inappropriate.

   *

   * @see POA for the list of required policies.

   * @see #the_children()

   */

  POA create_POA(String child_name, POAManager manager, Policy[] policies)

          throws AdapterAlreadyExists, InvalidPolicy;

  /**

  * Find and optionally activate the child POA with the given name.

  *

  * @param poa_name the name of the POA to find.

  * @param activate_it if the child with the specified name is not found

  * or inactive and this parameter is true, the target POA activator is

  * invoked to activate that child. If this succeeds, that child POA

  * is returned.

  *

  * @throws AdapterNonExistent if no active child with the given name

  * is found and one of the following is true:

  * a) the target POA has no associated

  * {@link AdapterActivator}. b) that activator fails to activate the

  * child POA. c) <code>activate_id</code> = false.

  */

  POA find_POA(String poa_name, boolean activate_it)

        throws AdapterNonExistent;

  /**

   * Generate the Object Id for the given servant and add the servant to

   * the Active Object Map using this Id a a key. If the servant

   * activator is set, its incarnate method will be called. In this case,

   * the passed servant in this method can be null; in this case, the servant,

   * returned by {@link ServantActivatorOperations#incarnate} will

   * be used.

   *

   * @param a_servant a servant that would serve the object with the

   * returned Object Id.

   *

   * @return the generated objert Id for the given servant.

   *

   * @throws ServantAlreadyActive if this servant is already in the

   * Active Object Map and the UNIQUE_ID policy applies.

   *

   * @throws WrongPolicy if the required policies SYSTEM_ID and RETAIN

   * do not apply to this POA.

   */

  byte[] activate_object(Servant a_servant)

                  throws ServantAlreadyActive, WrongPolicy;

  /**

   * Add the given servant to the Active Object Map as a servant for the

   * object with the provided Object Id. If the servant activator is

   * set, its incarnate method will be called. In this case,

   * the passed servant in this method can be null; in this case, the servant,

   * returned by {@link ServantActivatorOperations#incarnate} will

   * be used.

   *

   * @param an_Object_Id an object id for the given object.

   * @param a_servant a servant that will serve the object with the given

   * Object Id.

   *

   * @throws ObjectAlreadyActive if the given object id is already in the

   * Active Object Map.

   * @throws WrongPolicy if the required RETAIN policy does not apply to

   * this POA.

   * @throws BAD_PARAM if the passed object id is invalid due any reason.

   */

  void activate_object_with_id(byte[] an_Object_Id, Servant a_servant)

                        throws ServantAlreadyActive, ObjectAlreadyActive,

                               WrongPolicy;

  /**

   * <p>Deactivate object with the given id. Client, trying to call

   * method on the deactivated object will either receive the remote

   * exception ({@link org.omg.CORBA.OBJECT_NOT_EXIST}, minor 0x535503ec),

   * incomplete) or the object will be reactivated and serve the request.

   * The object can be reactivated only if the implicit activation

   * policy applies and the servant activator is set.</p><p>

   * The deactivated object will continue to process requests that arrived

   * before decativation.

   * If this POA has the associated servant manager, a

   * {@link ServantActivatorOperations#etherealize} is <i>immediately</i>

   * invoked on the passed id. The deactivated object can be reactivated

   * by {@link #activate_object_with_id}.</p>

   * <p>The deactivation will not release thread, port or memory resources,

   * taken by that object. This is due requirement to make the

   * object reactivation possible at any time. To release the resources,

   * you must destroy the POA.

   * </p>

   *

   * @throws WrongPolicy if the required RETAIN policy does not apply to

   * this POA.

   */

  void deactivate_object(byte[] the_Object_Id)

                  throws ObjectNotActive, WrongPolicy;

  /**

  * Create the object reference, encapsulating the given repository Id and

  * the Object Id, generated by this POA. The returned object will not be

  * activated by default and may be activated on the first invocation by

  * the servant manager (if it is set and if policies are applicable).

  * The returned object can also be narrowed by helper and used locally.

  * In this case, the servant will be activated on the first local call of

  * any method. The methods on returned object can also be invoked by

  * name, using {@link org.omg.CORBA.Request}.

  *

  * @param a_repository_id the repository id for the given object. When

  * narrowing the returned object with some helper, it will be checked for

  * equality with value, returned by the the helper id().

  *

  * @throws WrongPolicy if the required SYSTEM_ID policy does not apply to

  * this POA.

  */

  org.omg.CORBA.Object create_reference(String a_repository_id)

                                 throws WrongPolicy;

  /**

  * <p> Create the object reference, encapsulating the given repository Id and

  * the given Object Id. The returned object will not be

  * activated by default and may be activated on the first invocation by

  * the servant manager (if it is set and if policies are applicable).

  * </p><p>

  * The returned object can also be narrowed by helper and used locally.

  * In this case, the servant will be activated on the first local call of

  * any method. The methods on returned object can also be invoked by

  * name, using {@link org.omg.CORBA.Request}.

  * </p>

  *

  * @param an_object_id the object id for the object being created.

  * If the POA uses the SYSTEM_ID policy, the portable application

  * must only supply ids, generated by that POA.

  *

  * @param a_repository_id the repository id for the given object. When

  * narrowing the returned object with some helper, it will be checked for

  * equality with value, returned by the the helper id().

  */

  org.omg.CORBA.Object create_reference_with_id(byte[] an_object_id,

                                                String a_repository_id

                                               );

  /**

   * Returns a default servant for this POA.

   *

   * @return a servant that will be used for requests for

   * which no servant is found in the Active Object Map.

   *

   * @throws NoServant if there is no default servant associated with this POA.

   * @throws WrongPolicy if the USE_DEFAULT_SERVANT policy is not active.

   */

  Servant get_servant()

               throws NoServant, WrongPolicy;

  /**

   * Sets the default servant for this POA.

   *

   * @param a_servant a servant that will be used for requests for

   * which no servant is found in the Active Object Map.

   *

   * @throws WrongPolicy if the USE_DEFAULT_SERVANT policy is not active.

   */

  void set_servant(Servant a_servant)

            throws WrongPolicy;

  /**

   * Set a servant manager for this POA.

   *

   * @param a_manager servant manager being set. If the RETAIN policy applies, the

   * manager must implement a {@link ServantActivator}. If the NON_RETAIN

   * policy applies, the manager must implement a {@link ServantLocator}.

   *

   * @throws WrongPolicy if the required USE_SERVANT_MANAGER policy does not

   * apply to this POA.

   *

   * @throws OBJ_ADAPTER minor code 4 if the passed manager does not

   * implement the required interface ({@link ServantActivator},

   * {@link ServantLocator}).

   *

   * @throws BAD_INV_ORDER minor code 6 if the method is called more than once

   * on the same POA. The manager can be set only once.

   */

  void set_servant_manager(ServantManager a_manager)

                    throws WrongPolicy;

  /**

   * Get the servant manager, associated with this POA.

   *

   * @return the associated servant manager or null if it has

   * been previously set.

   *

   * @throws WrongPolicy if the required USE_SERVANT_MANAGER policy does not

   * apply to this POA.

   */

  ServantManager get_servant_manager()

                              throws WrongPolicy;

  /**

   * Get the unique Id of the POA in the process in which it is created.

   * This Id is needed by portable interceptors. The id is unique

   * for the life span of the POA in the process. For persistent

   * POAs, if a POA is created in the same path with the same name as

   * another POA, these POAs are identical have the same id. All transient

   * POAs are assumed unique.

   */

  byte[] id();

  /**

   * Returns the reference to the active object with the given Id.

   *

   * @param the_Object_Id the object id.

   *

   * @throws ObjectNotActive if there is no active object with such Id.

   * @throws WrongPolicy if the required RETAIN policy does not apply to

   * this POA.

   */

  org.omg.CORBA.Object id_to_reference(byte[] the_Object_Id)

                                throws ObjectNotActive, WrongPolicy;

  /**

   * Returns the servant that serves the active object with the given Id.

   *

   * @param the_Object_Id the object id.

   *

   * @throws ObjectNotActive if there is no active object with such Id.

   * @throws WrongPolicy This method requires either RETAIN or

   * USE_DEFAULT_SERVANT policies and reaises the WrongPolicy if none of them

   * apply to this POA.

   */

  Servant id_to_servant(byte[] the_Object_Id)

                 throws ObjectNotActive, WrongPolicy;

  /**

   * Returns the Object Id, encapsulated in the given object reference.

   *

   * @param the_Object the object that has been previously created with this

   * POA. It need not be active.

   *

   * @throws WrongAdapter if the passed object has not been previously created

   * with this POA.

   * @throws WrongPolicy never (declared for the future extensions only).

   */

  byte[] reference_to_id(org.omg.CORBA.Object the_Object)

                  throws WrongAdapter, WrongPolicy;

  /**

   * Returns the servant that is serving this object.

   *

   * @return if the RETAIN policy applies and the object is in the Active

   * Object Map, the method returns the servant, associated with this object.

   * Otherwise, if the USE_DEFAULT_SERVANT policy applies, the method returns

   * the default servant (if one was set).

   *

   * @throws ObjectNotActive if none of the conditions above are satisfied.

   * @throws WrongAdapter if the object reference was not created with this POA.

   * @throws WrongPolicy This method requires either RETAIN or

   * USE_DEFAULT_SERVANT policies and reaises the WrongPolicy if none of them

   * apply to this POA.

   */

  Servant reference_to_servant(org.omg.CORBA.Object the_Object)

                        throws ObjectNotActive, WrongPolicy, WrongAdapter;

  /**

  * Returns the id of the object, served by the given servant. The id is found

  * in one of the following ways.

  * <ul>

  * <li>If the POA has both the RETAIN and the UNIQUE_ID policy and

  * the specified servant is active, the method return the Object Id associated

  * with that servant.

  * </li><li>

  * If the POA has both the RETAIN and the IMPLICIT_ACTIVATION policy and

  * either the POA has the MULTIPLE_ID policy or the specified servant is

  * inactive, the method activates the servant using a POA-generated Object Id

  * and the Interface Id associated with the servant, and returns that

  * Object Id.

  * </li>

  * <li>If the POA has the USE_DEFAULT_SERVANT policy, the servant specified

  * is the default servant, and the method is being invoked in the context o

  * f executing a request on the default servant, the method returns the

  * ObjectId associated with the current invocation.

  * </li>

  * </ul>

  * @throws ServantNotActive in all cases, not listed in the list above.

  * @throws WrongPolicy The method requres USE_DEFAULT_SERVANT policy or

  * a combination of the RETAIN policy and either the UNIQUE_ID or

  * IMPLICIT_ACTIVATION policies and throws the WrongPolicy if these conditions

  * are not satisfied.

  */

  byte[] servant_to_id(Servant the_Servant)

                throws ServantNotActive, WrongPolicy;

  /**

   * <p>Converts the given servant to the object reference.

   * The servant will serve all methods, invoked on the returned object.

   * The returned object reference can be passed to the remote client,

   * enabling remote invocations.

   * </p><p>

   * If the specified servant already serves some active object, that

   * object is returned. Otherwise,

   * if the POA has the IMPLICIT_ACTIVATION policy the method activates

   * the servant, creating an new object with the POA-generated Object Id.

   * In this case, if the servant activator is set, the

   * {@link ServantActivatorOperations#incarnate} method will be called.

   * </p>

   *

   * @throws ServantNotActive if the servant is inactive and no

   * IMPLICIT_ACTIVATION policy applies.

   * @throws WrongPolicy This method needs the RETAIN policy and either the

   * UNIQUE_ID or IMPLICIT_ACTIVATION policies.

   *

   * @return the object, exposing the given servant in the context of this POA.

   */

  org.omg.CORBA.Object servant_to_reference(Servant the_Servant)

                                     throws ServantNotActive, WrongPolicy;

  /**

   * Return the POA manager, associated with this POA.

   *

   * @return the associated POA manager (always available).

   */

  POAManager the_POAManager();

  /**

   * Returns the adapter activator, associated with this POA.

   * The newly created POA has no activator (null would be

   * returned). The ORB root POA also initially has no activator.

   *

   * @return tha adapter activator or null if this POA has no

   * associated adapter activator.

   */

  AdapterActivator the_activator();

  /**

  * Set the adapter activator for this POA.

  *

  * @param activator the activator being set.

  */

  void the_activator(AdapterActivator activator);

  /**

  * The children of this POA.

  *

  * @return the array of all childs for this POA.

  */

  POA[] the_children();

  /**

   * Return the name of this POA.

   *

   * @return the name of POA, relative to its parent.

   */

  String the_name();

  /**

   * Return the parent of this POA.

   *

   * @return the parent POA or <code>null</code> if this is a root POA.

   */

  POA the_parent();

  /**

   * <p> Destroy this POA and all descendant POAs. The destroyed POAs can be

   * later re-created via {@link AdapterActivator} or by invoking

   * {@link #create_POA}.

   * This differs from {@link POAManagerOperations#deactivate} that does

   * not allow recreation of the deactivated POAs. After deactivation,

   * recreation is only possible if the POAs were later destroyed.

   * </p><p>

   * The remote invocation on the target, belonging to the POA that is

   * currently destroyed return the remote exception ({@link TRANSIENT},

   * minor code 4).

   * </p>

   * @param etherealize_objects if true, and POA has RETAIN policy, and the

   * servant manager is available, the servant manager method

   * {@link ServantActivatorOperations#etherealize} is called for each

   *  <i>active</i> object in the Active Object Map. This method should not

   * try to access POA being destroyed. If <code>destroy</code> is called

   * multiple times before the destruction completes,

   * the etherialization should be invoked only once.

   *

   * @param wait_for_completion if true, the method waits till the POA being

   * destroyed completes all current requests and etherialization. If false,

   * the method returns immediately.

   */

  void destroy(boolean etherealize_objects, boolean wait_for_completion);

  /**

   * Create the IdUniquenessPolicy policy.

   *

   * @param a_value states which one Id uniqueness policy will apply.

   *

   * @return the created policy.

   */

  IdUniquenessPolicy create_id_uniqueness_policy(IdUniquenessPolicyValue a_value);

  /**

   * Create the ImplicitActivationPolicy policy.

   *

   * @param a_value states which one activation policy will apply.

   *

   * @return the created policy.

   */

  ImplicitActivationPolicy create_implicit_activation_policy(ImplicitActivationPolicyValue a_value);

  /**

   * Create the LifespanPolicy policy.

   *

   * @param a_value states which one object lifespan policy will apply.

   *

   * @return the created policy.

   */

  LifespanPolicy create_lifespan_policy(LifespanPolicyValue a_value);

  /**

   * Create the RequestProcessingPolicy policy.

   *

   * @param a_value states which one request processing policy will apply.

   *

   * @return the created policy.

   */

  RequestProcessingPolicy create_request_processing_policy(RequestProcessingPolicyValue a_value);

  /**

   * Create the ServantRetentionPolicy policy.

   *

   * @param a_value states which one servant retention policy will apply.

   *

   * @return the created policy.

   */

  ServantRetentionPolicy create_servant_retention_policy(ServantRetentionPolicyValue a_value);

  /**

   * Create the ThreadPolicy policy.

   *

   * @param a_value states which one thread policy will apply.

   *

   * @return the created policy.

   */

  ThreadPolicy create_thread_policy(ThreadPolicyValue a_value);

  /**

  * Create the ID assignment policy with the given value.

  *

  * @param value states which one ID assignment policy will apply.

  *

  * @return the created policy.

  */

  IdAssignmentPolicy create_id_assignment_policy(IdAssignmentPolicyValue value);

}