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/* -*- C++ -*- */
//=============================================================================
/**
* @file Transient_Naming_Context.h
*
* $Id$
*
* @author Marina Spivak <marina@cs.wustl.edu>
*/
//=============================================================================
#ifndef TAO_TRANSIENT_NAMING_CONTEXT_H
#define TAO_TRANSIENT_NAMING_CONTEXT_H
#include /**/ "ace/pre.h"
#include "Hash_Naming_Context.h"
#include "Entries.h"
#include "ace/Hash_Map_Manager.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
/**
* @class TAO_Transient_Bindings_Map
*
* @brief Provides hash-table-based transient storage for name to object
* bindings in a Naming Context.
*
* A thin wrapper on top of ACE_Hash_Map_Manager. Supports
* TAO_Bindings_Map interface. Used by TAO_Transient_Naming_Context.
*/
class TAO_Naming_Export TAO_Transient_Bindings_Map : public TAO_Bindings_Map
{
public:
/// Underlying data structure - typedef for ease of use.
typedef ACE_Hash_Map_Manager<TAO_ExtId, TAO_IntId, ACE_Null_Mutex> HASH_MAP;
// = Initialization and termination methods.
/// Constructor.
TAO_Transient_Bindings_Map (size_t hash_table_size);
/// Destructor.
virtual ~TAO_Transient_Bindings_Map (void);
// = Accessors.
/// Get a reference to the underlying hash map.
HASH_MAP &map (void);
/// Return the size of the underlying hash table.
size_t total_size (void);
/// Return current number of entries (name bindings) in the
/// underlying hash map.
virtual size_t current_size (void);
// = Name bindings manipulation methods.
/**
* Add a binding with the specified parameters to the table.
* Return 0 on success and -1 on failure, 1 if there already is a
* binding with <id> and <kind>.
*/
virtual int bind (const char *id,
const char *kind,
CORBA::Object_ptr obj,
CosNaming::BindingType type);
/**
* Overwrite a binding containing <id> and <kind> (or create a new
* one if one doesn't exist) with the specified parameters. Return
* 0 or 1 on success. Return -1 or -2 on failure. (-2 is returned
* if the new and old bindings differ in type).
*/
virtual int rebind (const char *id,
const char *kind,
CORBA::Object_ptr obj,
CosNaming::BindingType type);
/**
* Remove a binding containing <id> and <kind> from the table.
* Return 0 on success and -1 on failure.
*/
virtual int unbind (const char * id,
const char * kind);
/**
* Find the binding containing <id> and <kind> in the table, and
* pass binding's type and object back to the caller by reference.
* Return 0 on success and -1 on failure. Note: a 'duplicated' object
* reference is assigned to <obj>, so the caller is responsible for
* its deallocation.
*/
virtual int find (const char * id,
const char * kind,
CORBA::Object_ptr & obj,
CosNaming::BindingType &type);
private:
/// Helper: factors common code from <bind> and <rebind>.
int shared_bind (const char *id,
const char *kind,
CORBA::Object_ptr obj,
CosNaming::BindingType type,
int rebind);
/// Hash map used for storage.
HASH_MAP map_;
};
/**
* @class TAO_Transient_Naming_Context
*
* @brief This class plays a role of a 'ConcreteImplementor' in the
* Bridge pattern architecture of the CosNaming::NamingContext
* implementation.
*
* This class provides a transient implementation of the
* NamingContext functionality, i.e., the state is not preserved
* across process boundaries. Derives from
* TAO_Hash_Naming_Context and uses TAO_Transient_Bindings_Map to
* store name to object bindings.
*/
class TAO_Naming_Export TAO_Transient_Naming_Context : public TAO_Hash_Naming_Context
{
public:
/// Underlying data structure - typedef for ease of use.
typedef TAO_Transient_Bindings_Map::HASH_MAP HASH_MAP;
// = Initialization and termination methods.
/// Constructor.
TAO_Transient_Naming_Context (PortableServer::POA_ptr poa,
const char *poa_id,
size_t hash_table_size
= ACE_DEFAULT_MAP_SIZE);
/// Destructor.
virtual ~TAO_Transient_Naming_Context (void);
// = Utility methods.
/**
* This utility method factors out the code needed to create a new
* Transient Naming Context servant and activate it under the
* specified POA with the specified id. This function is static so
* that the code can be used, both from inside the class (e.g., <new_context>),
* and from outside (e.g., Naming_Utils.cpp).
*/
static CosNaming::NamingContext_ptr make_new_context (PortableServer::POA_ptr poa,
const char *poa_id,
size_t context_size
ACE_ENV_ARG_DECL);
// = Methods not implemented in TAO_Hash_Naming_Context.
/**
* This operation returns a new naming context implemented by the
* same naming server in which the operation was invoked. The
* context is not bound.
*/
virtual CosNaming::NamingContext_ptr new_context (ACE_ENV_SINGLE_ARG_DECL);
/**
* Returns at most the requested number of bindings <how_many> in
* <bl>. If the naming context contains additional bindings, they
* are returned with a BindingIterator. In the naming context does
* not contain any additional bindings <bi> returned as null.
*/
virtual void list (CORBA::ULong how_many,
CosNaming::BindingList_out &bl,
CosNaming::BindingIterator_out &bi
ACE_ENV_ARG_DECL);
protected:
/// Counter used for generation of POA ids for children Naming
/// Contexts.
ACE_UINT32 counter_;
/**
* A pointer to the underlying data structure used to store name
* bindings. While our superclass (TAO_Hash_Naming_Context) also
* maintains a pointer to the data structure, keeping this pointer
* around saves us from the need to downcast when invoking
* non-virtual methods.
*/
TAO_Transient_Bindings_Map *transient_context_;
};
#include /**/ "ace/post.h"
#endif /* TAO_TRANSIENT_NAMING_CONTEXT_H */
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