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// -*- C++ -*-
//=============================================================================
/**
* @file Hash_Naming_Context.h
*
* @author Marina Spivak <marina@cs.wustl.edu>
*/
//=============================================================================
#ifndef TAO_HASH_NAMING_CONTEXT_H
#define TAO_HASH_NAMING_CONTEXT_H
#include /**/ "ace/pre.h"
#include "orbsvcs/Naming/Naming_Context_Interface.h"
#include "orbsvcs/Naming/naming_serv_export.h"
#include "ace/Recursive_Thread_Mutex.h"
#include "ace/SString.h"
// This is to remove "inherits via dominance" warnings from MSVC.
#if defined (_MSC_VER)
# pragma warning (disable : 4250)
#endif /* _MSC_VER */
// Note: 'interface' has been defined as struct on WinCE platform and
// gives a compiler error. This undef has been found harmless on
// Windows and solaris platforms; however, if this generates
// error, then proper ifdef must be added around following block.
#if defined (interface)
#undef interface
#endif // interface
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
/**
* @class TAO_Bindings_Map
*
* @brief This abstract base class defines an interface for hash-based
* data structures used in implementations of NamingContext
* (i.e., TAO_Transient_Naming_Context and TAO_Persistent_Naming_Context)
*
* Define an interface for several hash-based data structures, so
* that we can write some code that would work with any of them,
* i.e., TAO_Hash_Naming_Context.
*/
class TAO_Naming_Serv_Export TAO_Bindings_Map
{
public:
/// Destructor.
virtual ~TAO_Bindings_Map (void);
/// Return current number of entries (name bindings) in the
/// underlying hash map.
virtual size_t current_size (void) = 0;
/**
* 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 @a id and @a kind.
*/
virtual int bind (const char *id,
const char *kind,
CORBA::Object_ptr obj,
CosNaming::BindingType type) = 0;
/**
* Overwrite a binding containing @a id and @a kind (or create a new
* one if one doesn't exist) with the specified parameters. Returns
* -1 on failure.
*/
virtual int rebind (const char *id,
const char *kind,
CORBA::Object_ptr obj,
CosNaming::BindingType type) = 0;
/// Remove a binding containing @a id and @a kind from the table.
/// Return 0 on success and -1 on failure.
virtual int unbind (const char * id,
const char * kind) = 0;
/**
* Find the binding containing @a id and @a 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 @a 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) = 0;
};
/**
* @class TAO_Hash_Naming_Context
*
* @brief This class factors out common code for two 'ConcreteImplementors'
* in the Bridge pattern architecture of the CosNaming::NamingContext
* implementation.
*
* This class contains 'algorithm' code that is common to two
* hash-table-based implementations of the NamingContext:
* TAO_Transient_Naming_Context and TAO_Persistent_Naming_Context.
* To help achieve this 'templatization', we use the abstract base
* class TAO_Bindings_Map, which provides a common interface to the data structures
* used in TAO_Persistent_Namng_Context and TAO_Transient_Naming_Context.
*/
class TAO_Naming_Serv_Export TAO_Hash_Naming_Context :public TAO_Naming_Context_Impl
{
public:
/// Constructor.
TAO_Hash_Naming_Context (PortableServer::POA_ptr poa,
const char *poa_id);
/// Set our interface_ pointer.
void interface (TAO_Naming_Context *i);
/// Destructor.
virtual ~TAO_Hash_Naming_Context (void);
// = Accessors.
/// Get the pointer to our interface.
TAO_Naming_Context *interface (void);
/// Returns true if this Naming Context is a root Naming Context for
/// the server, and false otherwise.
int root (void);
/// Returns true if this context had <destroy> operation invoked on
/// it, and false otherwise.
int destroyed (void);
// = CosNaming::NamingContext idl interface methods.
/**
* Create a binding for name @a n and object @a obj in the naming
* context. Compound names are treated as follows: ctx->bind (<c1;
* c2; c3; cn>, obj) = (ctx->resolve (<c1; c2; cn-1>))->bind (<cn>,
* obj) if the there already exists a binding for the specified
* name, <AlreadyBound> exception is thrown. Naming contexts should
* be bound using <bind_context> and <rebind_context> in order to
* participate in name resolution later.
*/
virtual void bind (const CosNaming::Name &n,
CORBA::Object_ptr obj);
/**
* This is similar to bind() operation above, except for when the
* binding for the specified name already exists in the specified
* context. In that case, the existing binding is replaced with the
* new one.
*/
virtual void rebind (const CosNaming::Name &n,
CORBA::Object_ptr obj);
/**
* This is the version of <bind> specifically for binding naming
* contexts, so that they will participate in name resolution when
* compound names are passed to be resolved.
*/
virtual void bind_context (const CosNaming::Name &n,
CosNaming::NamingContext_ptr nc);
/**
* This is a version of <rebind> specifically for naming contexts,
* so that they can participate in name resolution when compound
* names are passed.
*/
virtual void rebind_context (const CosNaming::Name &n,
CosNaming::NamingContext_ptr nc);
/**
* Return object reference that is bound to the name. Compound name
* resolve is defined as follows: ctx->resolve (<c1; c2; cn>) =
* ctx->resolve (<c1; c2 cn-1>)->resolve (<cn>) The naming service
* does not return the type of the object. Clients are responsible
* for "narrowing" the object to the appropriate type.
*/
virtual CORBA::Object_ptr resolve (const CosNaming::Name &n);
/**
* Remove the name binding from the context. When compound names
* are used, unbind is defined as follows: ctx->unbind (<c1; c2;
* cn>) = (ctx->resolve (<c1; c2; cn-1>))->unbind (<cn>)
*/
virtual void unbind (const CosNaming::Name &n);
/**
* This operation creates a new context and binds it to the name
* supplied as an argument. The newly-created context is
* implemented by the same server as the context in which it was
* bound (the name argument excluding the last component).
*/
virtual CosNaming::NamingContext_ptr bind_new_context (const CosNaming::Name &n);
/**
* Delete the naming context. The user should take care to <unbind> any
* bindings in which the given context is bound to some names, to
* avoid dangling references when invoking <destroy> operation.
* NOTE: <destroy> is a no-op on the root context.
* NOTE: after <destroy> is invoked on a Naming Context, all
* BindingIterators associated with that Naming Context are also destroyed.
*/
virtual void destroy (void);
/// Returns the Default POA of this Servant object
virtual PortableServer::POA_ptr _default_POA (void);
TAO_SYNCH_RW_MUTEX &lock (void);
protected:
// = Helper method used by other methods.
/**
* <get_context> is used by methods that need to resolve a compound
* name before performing the actual operation (e.g., bind, unbind,
* etc.) <get_context> takes a full name (including the last
* component that doesn't need to be resolved), and returns a
* pointer to the target context.
*/
CosNaming::NamingContext_ptr get_context (const CosNaming::Name &name);
/**
* Pointer to the data structure used to store this Naming Context's
* bindings. <context_> is initialized with a concrete data
* structure by subclasses, which know which data structure to use.
*/
TAO_Bindings_Map *context_;
/**
* Pointer to the <interface> object for which we serve as a
* <concrete implementation>, i.e., the object that delegates to us
* all client CosNaming::NamingContext CORBA calls.
* We need this pointer for reference counting.
*/
TAO_Naming_Context *interface_;
/// Lock used to serialize access to the underlying data structure.
TAO_SYNCH_RW_MUTEX lock_;
/**
* Flag indicating whether this Naming Context is no longer valid.
* This flag is necessary because immediate destruction
* might not be possible if there are pending requests on this servant
* in the POA.
*/
int destroyed_;
/// POA we are registered with.
PortableServer::POA_var poa_;
/**
* ID with which we are registered with <poa_>.
* Note, if <poa_id_> is equivalent to TAO_ROOT_NAMING_CONTEXT, then this Naming Context
* is the root Naming Context for the server, i.e., it is un<destroy>able.
*/
ACE_CString poa_id_;
};
TAO_END_VERSIONED_NAMESPACE_DECL
#include /**/ "ace/post.h"
#endif /* TAO_HASH_NAMING_CONTEXT_H */
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