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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// cos
//
// = FILENAME
// Transient_Naming_Context.h
//
// = AUTHOR
// Marina Spivak <marina@cs.wustl.edu>
//
// ============================================================================
#ifndef TAO_TRANSIENT_NAMING_CONTEXT_H
#define TAO_TRANSIENT_NAMING_CONTEXT_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_ORBSVCS_Export TAO_Transient_Bindings_Map : public TAO_Bindings_Map
{
// = TITLE
// Provides hash-table-based transient storage for name to object bindings in a
// Naming Context.
//
// = DESCRIPTION
// A thin wrapper on top of ACE_Hash_Map_Manager. Supports
// TAO_Bindings_Map interface. Used by TAO_Transient_Naming_Context.
public:
typedef ACE_Hash_Map_Manager<TAO_ExtId, TAO_IntId, ACE_Null_Mutex> HASH_MAP;
// Underlying data structure - typedef for ease of use.
// = Initialization and termination methods.
TAO_Transient_Bindings_Map (size_t hash_table_size);
// Constructor.
virtual ~TAO_Transient_Bindings_Map (void);
// Destructor.
// = Accessors.
HASH_MAP &map (void);
// Get a reference to the underlying hash map.
size_t total_size (void);
// Return the size of the underlying hash table.
virtual size_t current_size (void);
// Return current number of entries (name bindings) in the
// underlying hash map.
// = Name bindings manipulation methods.
virtual int bind (const char *id,
const char *kind,
CORBA::Object_ptr obj,
CosNaming::BindingType type);
// 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 rebind (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. Returns
// -1 on failure.
virtual int unbind (const char * id,
const char * kind);
// Remove a binding containing <id> and <kind> from the table.
// Return 0 on success and -1 on failure.
virtual int find (const char * id,
const char * kind,
CORBA::Object_ptr & obj,
CosNaming::BindingType &type);
// 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.
private:
int shared_bind (const char *id,
const char *kind,
CORBA::Object_ptr obj,
CosNaming::BindingType type,
int rebind);
// Helper: factors common code from <bind> and <rebind>.
HASH_MAP map_;
// Hash map used for storage.
};
class TAO_ORBSVCS_Export TAO_Transient_Naming_Context : public TAO_Hash_Naming_Context
{
// = TITLE
// This class plays a role of a 'ConcreteImplementor' in the
// Bridge pattern architecture of the CosNaming::NamingContext
// implementation.
//
// = DESCRIPTION
// 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.
public:
typedef TAO_Transient_Bindings_Map::HASH_MAP HASH_MAP;
// Underlying data structure - typedef for ease of use.
// = Initialization and termination methods.
TAO_Transient_Naming_Context (PortableServer::POA_ptr poa,
const char *poa_id,
size_t hash_table_size
= ACE_DEFAULT_MAP_SIZE);
// Constructor.
virtual ~TAO_Transient_Naming_Context (void);
// Destructor.
// = Methods not implemented in TAO_Hash_Naming_Context.
virtual CosNaming::NamingContext_ptr new_context (CORBA::Environment &ACE_TRY_ENV);
// 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 void list (CORBA::ULong how_many,
CosNaming::BindingList_out &bl,
CosNaming::BindingIterator_out &bi,
CORBA::Environment &ACE_TRY_ENV);
// 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.
protected:
ACE_UINT32 counter_;
// Counter used for generation of POA ids for children Naming
// Contexts.
TAO_Transient_Bindings_Map *transient_context_;
// 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.
};
#endif /* TAO_TRANSIENT_NAMING_CONTEXT_H */
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