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# TAO_Persistent_Naming_Context Class Reference

This class plays a role of a 'ConcreteImplementor' in the Bridge pattern architecture of the CosNaming::NamingContext implementation. More...

`#include <Persistent_Naming_Context.h>`

Inheritance diagram for TAO_Persistent_Naming_Context:

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Collaboration diagram for TAO_Persistent_Naming_Context:

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List of all members.

## Public Types
typedef TAO_Persistent_Bindings_Map::HASH_MAP | HASH_MAP
| Underlying data structure - typedef for ease of use. More...
## Public Methods
| TAO_Persistent_Naming_Context (PortableServer::POA_ptr poa, const char *poa_id, TAO_Persistent_Context_Index *context_index)
| Constructor. MUST be followed up by <init> to allocate the underlying data structure from persistent storage! More...
int | init (size_t hash_table_size=ACE_DEFAULT_MAP_SIZE)
| Allocate the underlying data structure from persistent storage. Returns 0 on success and -1 on failure. More...
| TAO_Persistent_Naming_Context (PortableServer::POA_ptr poa, const char *poa_id, TAO_Persistent_Context_Index *context_index, HASH_MAP *map, ACE_UINT32 *counter)
virtual | ~TAO_Persistent_Naming_Context (void)
| Destructor. More...
virtual CosNaming::NamingContext_ptr | new_context (ACE_ENV_SINGLE_ARG_DECL)
virtual void | list (CORBA::ULong how_many, CosNaming::BindingList_out &bl, CosNaming::BindingIterator_out &bi ACE_ENV_ARG_DECL)
## Static Public Methods
CosNaming::NamingContext_ptr | make_new_context (PortableServer::POA_ptr poa, const char *poa_id, size_t context_size, TAO_Persistent_Context_Index *ind ACE_ENV_ARG_DECL)
## Protected Methods
void | set_cleanup_level (int level)
## Protected Attributes
ACE_UINT32 * | counter_
| Counter used for generation of POA ids for children Naming Contexts. More...
TAO_Persistent_Bindings_Map * | persistent_context_
TAO_Persistent_Context_Index * | index_

## Detailed Description

This class plays a role of a 'ConcreteImplementor' in the Bridge pattern architecture of the CosNaming::NamingContext implementation.

This class provides a persistent implementation of the NamingContext functionality, i.e., the state is preserved across process boundaries. Derives from TAO_Hash_Naming_Context and uses TAO_Persistent_Bindings_Map to store name to object bindings.

## Member Typedef Documentation

typedef TAO_Persistent_Bindings_Map::HASH_MAP TAO_Persistent_Naming_Context::HASH_MAP

| Underlying data structure - typedef for ease of use.

## Constructor & Destructor Documentation

TAO_Persistent_Naming_Context::TAO_Persistent_Naming_Context | ( | PortableServer::POA_ptr | poa,
|  | const char * | poa_id,
|  | TAO_Persistent_Context_Index * | context_index
| ) |

| Constructor. MUST be followed up by <init> to allocate the underlying data structure from persistent storage!

TAO_Persistent_Naming_Context::TAO_Persistent_Naming_Context | ( | PortableServer::POA_ptr | poa,
|  | const char * | poa_id,
|  | TAO_Persistent_Context_Index * | context_index,
|  | HASH_MAP * | map,
|  | ACE_UINT32 * | counter
| ) |

| Constructor that takes in preallocated data structure and takes ownership of it. This constructor is for 'recreating' servants from persistent state.

TAO_Persistent_Naming_Context::~TAO_Persistent_Naming_Context | ( | void |  | ) | `[virtual]`

| Destructor.

## Member Function Documentation

int TAO_Persistent_Naming_Context::init | ( | size_t | hash_table_size = ACE_DEFAULT_MAP_SIZE | ) |

| Allocate the underlying data structure from persistent storage. Returns 0 on success and -1 on failure.

void TAO_Persistent_Naming_Context::list | ( | CORBA::ULong | how_many,
|  | CosNaming::BindingList_out & | bl,
|  | CosNaming::BindingIterator_out &bi | ACE_ENV_ARG_DECL
| ) | `[virtual]`

| 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. Reimplemented from TAO_Naming_Context_Impl.

CosNaming::NamingContext_ptr TAO_Persistent_Naming_Context::make_new_context | ( | PortableServer::POA_ptr | poa,
|  | const char * | poa_id,
|  | size_t | context_size,
|  | TAO_Persistent_Context_Index *ind | ACE_ENV_ARG_DECL
| ) | `[static]`

| This utility method factors out the code needed to create a new Persistent 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).

CosNaming::NamingContext_ptr TAO_Persistent_Naming_Context::new_context | ( | ACE_ENV_SINGLE_ARG_DECL |  | ) | `[virtual]`

| This operation returns a new naming context implemented by the same naming server in which the operation was invoked. The context is not bound. Reimplemented from TAO_Naming_Context_Impl.

void TAO_Persistent_Naming_Context::set_cleanup_level | ( | int | level | ) | `[protected]`

| Set <destroyed_> flag (inherited from TAO_Hash_Naming_Context) to <level>. Legal values for <destroyed_> are 0, 1, and 2. The values specify the extent of cleanup that should take place in the context's destructor: '0' - no cleanup (e.g., if the context goes out of scope, but it's state is to remain in persistent storage); '1' - free up the underlying data structure in persistent storage (e.g., if the initialization of this context was only partially completed due to some failures, and we need to roll back); '2' - free up the underlying data structure, and deregister this naming context from its <index_> (e.g., if the context had <destroy> method invoked and needs to be completely removed from existence).

## Member Data Documentation

ACE_UINT32* TAO_Persistent_Naming_Context::counter_`[protected]`

| Counter used for generation of POA ids for children Naming Contexts.

TAO_Persistent_Context_Index* TAO_Persistent_Naming_Context::index_`[protected]`

| A pointer to the index object of this naming service: it keeps track of all the naming contexts created. Every time we make a new context or destroy one, we need to make an entry there. Also, we get the allocator needed to initialize us from this guy.

TAO_Persistent_Bindings_Map* TAO_Persistent_Naming_Context::persistent_context_`[protected]`

| 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.

The documentation for this class was generated from the following files:

- Persistent_Naming_Context.h
- Persistent_Naming_Context.cpp