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//=============================================================================
/**
* @file Map_Manager.h
*
* $Id: Map_Manager.h 97505 2014-01-06 15:38:30Z johnnyw $
*
* @author Douglas C. Schmidt <schmidt@cs.wustl.edu>
*/
//=============================================================================
#ifndef ACE_MAP_MANAGER_H
#define ACE_MAP_MANAGER_H
#include /**/ "ace/pre.h"
#include /**/ "ace/config-all.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Basic_Types.h"
#include "ace/Global_Macros.h"
#include "ace/Default_Constants.h"
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
// Forward declaration.
class ACE_Allocator;
/**
* @class ACE_Map_Entry
*
* @brief An entry in the Map.
*/
template <class EXT_ID, class INT_ID>
class ACE_Map_Entry
{
public:
/// Initialize member variables.
ACE_Map_Entry (void);
/// We need this destructor to keep some compilers from complaining.
/// It's just a no-op, however.
~ACE_Map_Entry (void);
/// Key used to look up an entry.
EXT_ID ext_id_;
/// The contents of the entry itself.
INT_ID int_id_;
/// Dump the state of an object.
void dump (void) const;
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
// = These are really private, but unfortunately template friends
// are not portable.
/// Get next entry.
ACE_UINT32 next (void) const;
/// Set next entry.
void next (ACE_UINT32 n);
/// Get prev entry.
ACE_UINT32 prev (void) const;
/// Set prev entry.
void prev (ACE_UINT32 p);
/// Keeps track of the next entry.
ACE_UINT32 next_;
/// Keeps track of the previous entry.
ACE_UINT32 prev_;
#if defined (ACE_HAS_LAZY_MAP_MANAGER)
/// Is this entry free?
bool free_;
#endif /* ACE_HAS_LAZY_MAP_MANAGER */
};
// Forward decl.
template <class EXT_ID, class INT_ID, class ACE_LOCK>
class ACE_Map_Iterator_Base;
// Forward decl.
template <class EXT_ID, class INT_ID, class ACE_LOCK>
class ACE_Map_Const_Iterator_Base;
// Forward decl.
template <class EXT_ID, class INT_ID, class ACE_LOCK>
class ACE_Map_Iterator;
// Forward decl.
template <class EXT_ID, class INT_ID, class ACE_LOCK>
class ACE_Map_Const_Iterator;
// Forward decl.
template <class EXT_ID, class INT_ID, class ACE_LOCK>
class ACE_Map_Reverse_Iterator;
/**
* @class ACE_Map_Manager
*
* @brief
* Define a map abstraction that associates EXT_IDs with
* INT_IDs.
*
* The EXT_ID must support @c operator==. This constraint can
* be alleviated via template specialization, as shown in the
* $ACE_ROOT/tests/Conn_Test.cpp test.
* This class uses an ACE_Allocator to allocate memory. The
* user can make this a persistant class by providing an
* ACE_Allocator with a persistable memory pool.
* This implementation of a map uses an array, which is searched
* linearly. For more efficient searching you should use the
* ACE_Hash_Map_Manager.
*/
template <class EXT_ID, class INT_ID, class ACE_LOCK>
class ACE_Map_Manager
{
public:
friend class ACE_Map_Iterator_Base<EXT_ID, INT_ID, ACE_LOCK>;
friend class ACE_Map_Const_Iterator_Base<EXT_ID, INT_ID, ACE_LOCK>;
friend class ACE_Map_Iterator<EXT_ID, INT_ID, ACE_LOCK>;
friend class ACE_Map_Const_Iterator<EXT_ID, INT_ID, ACE_LOCK>;
friend class ACE_Map_Reverse_Iterator<EXT_ID, INT_ID, ACE_LOCK>;
// = Traits.
typedef EXT_ID KEY;
typedef INT_ID VALUE;
typedef ACE_LOCK lock_type;
typedef ACE_Map_Entry<EXT_ID, INT_ID> ENTRY;
typedef ACE_Map_Iterator<EXT_ID, INT_ID, ACE_LOCK> ITERATOR;
typedef ACE_Map_Const_Iterator<EXT_ID, INT_ID, ACE_LOCK> CONST_ITERATOR;
typedef ACE_Map_Reverse_Iterator<EXT_ID, INT_ID, ACE_LOCK> REVERSE_ITERATOR;
typedef ACE_Map_Iterator<EXT_ID, INT_ID, ACE_LOCK> iterator;
typedef ACE_Map_Const_Iterator<EXT_ID, INT_ID, ACE_LOCK> const_iterator;
typedef ACE_Map_Reverse_Iterator<EXT_ID, INT_ID, ACE_LOCK> reverse_iterator;
// = Initialization and termination methods.
/// Initialize a ACE_Map_Manager with the ACE_DEFAULT_MAP_SIZE.
ACE_Map_Manager (ACE_Allocator *alloc = 0);
/// Initialize a ACE_Map_Manager with @a size entries.
ACE_Map_Manager (size_t size,
ACE_Allocator *alloc = 0);
/// Initialize a ACE_Map_Manager with size @a length.
int open (size_t length = ACE_DEFAULT_MAP_SIZE,
ACE_Allocator *alloc = 0);
/// Close down a ACE_Map_Manager and release dynamically allocated
/// resources.
int close (void);
/// Close down a ACE_Map_Manager and release dynamically allocated
/// resources.
~ACE_Map_Manager (void);
/**
* Associate @a ext_id with @a int_id. If @a ext_id is already in the
* map then the ACE_Map_Entry is not changed.
* @retval 0 If a new entry is bound successfully.
* @retval 1 If an attempt is made to bind an existing entry.
* @retval -1 If failures occur.
*/
int bind (const EXT_ID &ext_id,
const INT_ID &int_id);
/**
* Reassociate @a ext_id with @a int_id. If @a ext_id is not in the
* map then behaves just like bind(). Otherwise, store the old
* values of @a ext_id and @a int_id into the "out" parameters and
* rebind the new parameters. This is very useful if you need to
* have an atomic way of updating <Map_Entries> and you also need
* full control over memory allocation.
* @retval 0 If a new entry is bound successfully.
* @retval 1 If an existing entry was rebound.
* @retval -1 If failures occur.
*/
int rebind (const EXT_ID &ext_id,
const INT_ID &int_id,
EXT_ID &old_ext_id,
INT_ID &old_int_id);
/**
* Reassociate @a ext_id with @a int_id. If @a ext_id is not in the
* map then behaves just like bind(). Otherwise, store the old
* values of @a int_id into the "out" parameter and rebind the new
* parameters.
* @retval 0 If a new entry is bound successfully.
* @retval 1 If an existing entry was rebound.
* @retval -1 If failures occur.
*/
int rebind (const EXT_ID &ext_id,
const INT_ID &int_id,
INT_ID &old_int_id);
/// Reassociate @a ext_id with @a int_id. Old values in the map are
/// ignored.
int rebind (const EXT_ID &ext_id,
const INT_ID &int_id);
/**
* Associate @a ext_id with @a int_id if and only if @a ext_id is not
* in the map. If @a ext_id is already in the map then the @a int_id
* parameter is overwritten with the existing value in the map
* @retval 0 If a new entry is bound successfully.
* @retval 1 If an attempt is made to bind an existing entry.
* @retval -1 If failures occur.
*/
int trybind (const EXT_ID &ext_id,
INT_ID &int_id);
/**
* Locate @a ext_id and pass out parameter via @a int_id.
* @retval 0 If found.
* @retval -1 If not found.
*/
int find (const EXT_ID &ext_id,
INT_ID &int_id) const;
/// Returns 0 if the @a ext_id is in the mapping, otherwise -1.
int find (const EXT_ID &ext_id) const;
/**
* Unbind (remove) the @a ext_id from the map. Don't return the
* @a int_id to the caller (this is useful for collections where the
* @a int_ids are *not* dynamically allocated...) Returns 0 if
* successful, else -1.
*/
int unbind (const EXT_ID &ext_id);
/**
* Break any association of @a ext_id. Returns the value of @a int_id
* in case the caller needs to deallocate memory. Returns 0 if
* successful, else -1.
*/
int unbind (const EXT_ID &ext_id,
INT_ID &int_id);
/**
* Unbind all entires.
*/
void unbind_all (void);
/// Return the current size of the map.
size_t current_size (void) const;
/// Return the total size of the map.
size_t total_size (void) const;
/**
* Returns a reference to the underlying ACE_LOCK. This makes it
* possible to acquire the lock explicitly, which can be useful in
* some cases if you instantiate the ACE_Atomic_Op with an
* ACE_Recursive_Mutex or ACE_Process_Mutex, or if you need to
* guard the state of an iterator.
* @note The right name would be lock, but HP/C++ will choke on that!
*/
ACE_LOCK &mutex (void);
/// Dump the state of an object.
void dump (void) const;
// = STL styled iterator factory functions.
/// Return forward iterator.
ACE_Map_Iterator<EXT_ID, INT_ID, ACE_LOCK> begin (void);
ACE_Map_Iterator<EXT_ID, INT_ID, ACE_LOCK> end (void);
/// Return reverse iterator.
ACE_Map_Reverse_Iterator<EXT_ID, INT_ID, ACE_LOCK> rbegin (void);
ACE_Map_Reverse_Iterator<EXT_ID, INT_ID, ACE_LOCK> rend (void);
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
protected:
// = The following methods do the actual work.
// These methods assume that the locks are held by the private
// methods.
/// Performs the binding of @a ext_id to @a int_id. Must be called
/// with locks held.
int bind_i (const EXT_ID &ext_id,
const INT_ID &int_id);
/// Bind an entry (without finding first). Must be called with locks
/// held.
int shared_bind (const EXT_ID &ext_id,
const INT_ID &int_id);
/// Performs a rebinding of <ext_it> to @a int_id. Also, recovers old
/// values. Must be called with locks held.
int rebind_i (const EXT_ID &ext_id,
const INT_ID &int_id,
EXT_ID &old_ext_id,
INT_ID &old_int_id);
/// Performs a rebinding of <ext_it> to @a int_id. Also, recovers old
/// values. Must be called with locks held.
int rebind_i (const EXT_ID &ext_id,
const INT_ID &int_id,
INT_ID &old_int_id);
/// Performs a rebinding of <ext_it> to @a int_id. Must be called
/// with locks held.
int rebind_i (const EXT_ID &ext_id,
const INT_ID &int_id);
/// Performs a conditional bind of @a int_id using @a ext_id as the
/// key. Must be called with locks held.
int trybind_i (const EXT_ID &ext_id,
INT_ID &int_id);
/// Performs a find of @a int_id using @a ext_id as the key. Must be
/// called with locks held.
int find_i (const EXT_ID &ext_id,
INT_ID &int_id);
/// Performs a find using @a ext_id as the key. Must be called with
/// locks held.
int find_and_return_index (const EXT_ID &ext_id,
ACE_UINT32 &slot);
/// Performs an unbind of @a int_id using @a ext_id as the key. Must
/// be called with locks held.
int unbind_i (const EXT_ID &ext_id,
INT_ID &int_id);
/// Performs an unbind using @a ext_id as the key. Must be called
/// with locks held.
int unbind_i (const EXT_ID &ext_id);
/// Performs an unbind using @a ext_id as the key. Must be called
/// with locks held.
int unbind_and_return_index (const EXT_ID &ext_id,
ACE_UINT32 &slot);
/// Unbind @a slot.
void unbind_slot (ACE_UINT32 slot);
/// Resize the map. Must be called with locks held.
int resize_i (ACE_UINT32 size);
/// Close down a <Map_Manager>. Must be called with locks held.
int close_i (void);
/// Returns 1 if <id1> == <id2>, else 0. This is defined as a
/// separate method to facilitate template specialization.
int equal (const EXT_ID &id1, const EXT_ID &id2);
/// This function returns the new size of the Map Manager. This
/// function is called when we run out of room and need to resize.
ACE_UINT32 new_size (void);
/// Explicitly call the destructors and free up the
/// <search_structure_>.
void free_search_structure (void);
/// Id of the free list sentinel.
ACE_UINT32 free_list_id (void) const;
/// Id of the occupied list sentinel.
ACE_UINT32 occupied_list_id (void) const;
/// Finds the next free slot.
int next_free (ACE_UINT32 &slot);
/// Move from free list to occupied list.
void move_from_free_list_to_occupied_list (ACE_UINT32 slot);
/// Move from occupied list to free list.
void move_from_occupied_list_to_free_list (ACE_UINT32 slot);
#if defined (ACE_HAS_LAZY_MAP_MANAGER)
/**
* In the case of lazy map managers, the movement of free slots from
* the occupied list to the free list is delayed until we run out of
* free slots in the free list. This function goes through the
* entire occupied list, moving free slots to the free list.
*/
void move_all_free_slots_from_occupied_list (void);
#endif /* ACE_HAS_LAZY_MAP_MANAGER */
/// Move helper.
void shared_move (ACE_UINT32 slot,
ACE_Map_Entry<EXT_ID, INT_ID> ¤t_list,
ACE_UINT32 current_list_id,
ACE_Map_Entry<EXT_ID, INT_ID> &new_list,
ACE_UINT32 new_list_id);
/// Pointer to a memory allocator.
ACE_Allocator *allocator_;
/// Synchronization variable for the MT_SAFE ACE_Map_Manager.
mutable ACE_LOCK lock_;
/// Implement the Map as a resizeable array of ACE_Map_Entry.
ACE_Map_Entry<EXT_ID, INT_ID> *search_structure_;
/// Total number of elements in this->search_structure_.
ACE_UINT32 total_size_;
/// Current size of the map.
ACE_UINT32 cur_size_;
/// Free list.
ACE_Map_Entry<EXT_ID, INT_ID> free_list_;
/// Occupied list.
ACE_Map_Entry<EXT_ID, INT_ID> occupied_list_;
enum
{
/// Grow map exponentially up to 64K
MAX_EXPONENTIAL = 64 * 1024,
/// Afterwards grow in chunks of 32K
LINEAR_INCREASE = 32 * 1024
};
private:
// = Disallow these operations.
ACE_UNIMPLEMENTED_FUNC (void operator= (const ACE_Map_Manager<EXT_ID, INT_ID, ACE_LOCK> &))
ACE_UNIMPLEMENTED_FUNC (ACE_Map_Manager (const ACE_Map_Manager<EXT_ID, INT_ID, ACE_LOCK> &))
};
/**
* @class ACE_Map_Iterator_Base
*
* @brief Iterator for the ACE_Map_Manager.
*
* This class factors out common code from its templatized
* subclasses.
*/
template <class EXT_ID, class INT_ID, class ACE_LOCK>
class ACE_Map_Iterator_Base
{
public:
// = Initialization method.
/// Contructor. If head != 0, the iterator constructed is positioned
/// at the head of the map, it is positioned at the end otherwise.
ACE_Map_Iterator_Base (ACE_Map_Manager <EXT_ID, INT_ID, ACE_LOCK> &mm);
// = Iteration methods.
/// Pass back the next <entry> that hasn't been seen in the Set.
/// Returns 0 when all items have been seen, else 1.
int next (ACE_Map_Entry<EXT_ID, INT_ID> *&next_entry) const;
/// Returns 1 when all items have been seen, else 0.
int done (void) const;
/// Returns a reference to the interal element @c this is pointing to.
ACE_Map_Entry<EXT_ID, INT_ID>& operator* (void) const;
/// Returns reference the Map_Manager that is being iterated
/// over.
ACE_Map_Manager<EXT_ID, INT_ID, ACE_LOCK>& map (void);
/// Check if two iterators point to the same position
bool operator== (const ACE_Map_Iterator_Base<EXT_ID, INT_ID, ACE_LOCK> &) const;
bool operator!= (const ACE_Map_Iterator_Base<EXT_ID, INT_ID, ACE_LOCK> &) const;
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
protected:
/// Move forward by one element in the set. Returns 0 when there's
/// no more item in the set after the current items, else 1.
int forward_i (void);
/// Move backware by one element in the set. Returns 0 when there's
/// no more item in the set before the current item, else 1.
int reverse_i (void);
/// Dump the state of an object.
void dump_i (void) const;
/// Map we are iterating over.
ACE_Map_Manager <EXT_ID, INT_ID, ACE_LOCK> *map_man_;
/// Keeps track of how far we've advanced...
ACE_UINT32 next_;
};
/**
* @class ACE_Map_Const_Iterator_Base
*
* @brief Const iterator for the ACE_Map_Manager.
*
* This class factors out common code from its templatized
* subclasses.
*/
template <class EXT_ID, class INT_ID, class ACE_LOCK>
class ACE_Map_Const_Iterator_Base
{
public:
// = Initialization method.
/// Contructor. If head != 0, the iterator constructed is positioned
/// at the head of the map, it is positioned at the end otherwise.
ACE_Map_Const_Iterator_Base (const ACE_Map_Manager <EXT_ID, INT_ID, ACE_LOCK> &mm);
// = Iteration methods.
/// Pass back the next <entry> that hasn't been seen in the Set.
/// Returns 0 when all items have been seen, else 1.
int next (ACE_Map_Entry<EXT_ID, INT_ID> *&next_entry) const;
/// Returns 1 when all items have been seen, else 0.
int done (void) const;
/// Returns a reference to the interal element @c this is pointing to.
ACE_Map_Entry<EXT_ID, INT_ID>& operator* (void) const;
/// Returns reference the Map_Manager that is being iterated
/// over.
const ACE_Map_Manager<EXT_ID, INT_ID, ACE_LOCK>& map (void) const;
/// Check if two iterators point to the same position
bool operator== (const ACE_Map_Const_Iterator_Base<EXT_ID, INT_ID, ACE_LOCK> &) const;
bool operator!= (const ACE_Map_Const_Iterator_Base<EXT_ID, INT_ID, ACE_LOCK> &) const;
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
protected:
/// Move forward by one element in the set. Returns 0 when there's
/// no more item in the set after the current items, else 1.
int forward_i (void);
/// Move backware by one element in the set. Returns 0 when there's
/// no more item in the set before the current item, else 1.
int reverse_i (void);
/// Dump the state of an object.
void dump_i (void) const;
/// Map we are iterating over.
const ACE_Map_Manager <EXT_ID, INT_ID, ACE_LOCK> *map_man_;
/// Keeps track of how far we've advanced...
ACE_UINT32 next_;
};
/**
* @class ACE_Map_Iterator
*
* @brief Forward iterator for the ACE_Map_Manager.
*
* This class does not perform any internal locking of the
* ACE_Map_Manager it is iterating upon since locking is
* inherently inefficient and/or error-prone within an STL-style
* iterator. If you require locking, you can explicitly use an
* ACE_GUARD or ACE_READ_GUARD on the ACE_Map_Manager's
* internal lock, which is accessible via its mutex() method.
*/
template <class EXT_ID, class INT_ID, class ACE_LOCK>
class ACE_Map_Iterator : public ACE_Map_Iterator_Base<EXT_ID, INT_ID, ACE_LOCK>
{
public:
// = Initialization method.
ACE_Map_Iterator (ACE_Map_Manager <EXT_ID, INT_ID, ACE_LOCK> &mm,
int pass_end = 0);
// = Iteration methods.
/// Move forward by one element in the set. Returns 0 when all the
/// items in the set have been seen, else 1.
int advance (void);
/// Dump the state of an object.
void dump (void) const;
// = STL styled iteration, compare, and reference functions.
/// Prefix advance.
ACE_Map_Iterator<EXT_ID, INT_ID, ACE_LOCK> &operator++ (void);
/// Postfix advance.
ACE_Map_Iterator<EXT_ID, INT_ID, ACE_LOCK> operator++ (int);
/// Prefix reverse.
ACE_Map_Iterator<EXT_ID, INT_ID, ACE_LOCK> &operator-- (void);
/// Postfix reverse.
ACE_Map_Iterator<EXT_ID, INT_ID, ACE_LOCK> operator-- (int);
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
};
/**
* @class ACE_Map_Const_Iterator
*
* @brief Forward const iterator for the ACE_Map_Manager.
*
* This class does not perform any internal locking of the
* ACE_Map_Manager it is iterating upon since locking is
* inherently inefficient and/or error-prone within an STL-style
* iterator. If you require locking, you can explicitly use an
* ACE_GUARD or ACE_READ_GUARD on the ACE_Map_Manager's
* internal lock, which is accessible via its mutex() method.
*/
template <class EXT_ID, class INT_ID, class ACE_LOCK>
class ACE_Map_Const_Iterator : public ACE_Map_Const_Iterator_Base<EXT_ID, INT_ID, ACE_LOCK>
{
public:
// = Initialization method.
ACE_Map_Const_Iterator (const ACE_Map_Manager <EXT_ID, INT_ID, ACE_LOCK> &mm,
int pass_end = 0);
// = Iteration methods.
/// Move forward by one element in the set. Returns 0 when all the
/// items in the set have been seen, else 1.
int advance (void);
/// Dump the state of an object.
void dump (void) const;
// = STL styled iteration, compare, and reference functions.
/// Prefix advance.
ACE_Map_Const_Iterator<EXT_ID, INT_ID, ACE_LOCK> &operator++ (void);
/// Postfix advance.
ACE_Map_Const_Iterator<EXT_ID, INT_ID, ACE_LOCK> operator++ (int);
/// Prefix reverse.
ACE_Map_Const_Iterator<EXT_ID, INT_ID, ACE_LOCK> &operator-- (void);
/// Postfix reverse.
ACE_Map_Const_Iterator<EXT_ID, INT_ID, ACE_LOCK> operator-- (int);
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
};
/**
* @class ACE_Map_Reverse_Iterator
*
* @brief Reverse Iterator for the ACE_Map_Manager.
*
* This class does not perform any internal locking of the
* ACE_Map_Manager it is iterating upon since locking is
* inherently inefficient and/or error-prone within an STL-style
* iterator. If you require locking, you can explicitly use an
* ACE_GUARD or ACE_READ_GUARD on the ACE_Map_Manager's
* internal lock, which is accessible via its mutex() method.
*/
template <class EXT_ID, class INT_ID, class ACE_LOCK>
class ACE_Map_Reverse_Iterator : public ACE_Map_Iterator_Base<EXT_ID, INT_ID, ACE_LOCK>
{
public:
// = Initialization method.
ACE_Map_Reverse_Iterator (ACE_Map_Manager <EXT_ID, INT_ID, ACE_LOCK> &mm,
int pass_end = 0);
// = Iteration methods.
/// Move forward by one element in the set. Returns 0 when all the
/// items in the set have been seen, else 1.
int advance (void);
/// Dump the state of an object.
void dump (void) const;
// = STL styled iteration, compare, and reference functions.
/// Prefix reverse.
ACE_Map_Reverse_Iterator<EXT_ID, INT_ID, ACE_LOCK> &operator++ (void);
/// Postfix reverse.
ACE_Map_Reverse_Iterator<EXT_ID, INT_ID, ACE_LOCK> operator++ (int);
/// Prefix advance.
ACE_Map_Reverse_Iterator<EXT_ID, INT_ID, ACE_LOCK> &operator-- (void);
/// Postfix advance.
ACE_Map_Reverse_Iterator<EXT_ID, INT_ID, ACE_LOCK> operator-- (int);
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
};
ACE_END_VERSIONED_NAMESPACE_DECL
#if defined (__ACE_INLINE__)
#include "ace/Map_Manager.inl"
#endif /* __ACE_INLINE__ */
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/Map_Manager.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("Map_Manager.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#include /**/ "ace/post.h"
#endif /* ACE_MAP_MANAGER_H */
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