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Length: 16384 (0x4000)
Types: Ada Source
Notes: 03_class, FILE, R1k_Segment, e3_tag, package Element_Cache, pragma Module_Name 4 3593, pragma Segmented_Heap Handle, pragma Segmented_Heap Key_Iterator, pragma Subsystem Design_Facility, seg_028ad7
└─⟦8527c1e9b⟧ Bits:30000544 8mm tape, Rational 1000, Arrival backup of disks in PAM's R1000
└─ ⟦5a81ac88f⟧ »Space Info Vol 1«
└─⟦this⟧
with Action;
with Ada_Program;
with Directory;
with Errors;
package Element_Cache is
subtype Element is Ada_Program.Element;
subtype Element_List is Ada_Program.Element_List;
type Handle is limited private;
type Modes is (Create, Read, Update);
--------------------------
-- Old Style Interfaces --
--------------------------
-- These interfaces are obsolete and their use is discouraged. The
-- preferred interfaces are declared below function Debug_Image.
procedure Open (Cache : in out Handle;
Mode : Modes;
Name : String);
procedure Close (Cache : in out Handle);
procedure Destroy (Cache : in out Handle);
subtype Key is String;
procedure Add (An_Element : Element;
To_Cache : in out Handle;
With_Key : Key);
procedure Remove (An_Element : Element;
From_Cache : in out Handle;
With_Key : Key);
procedure Add (An_Element_List : Element_List;
To_Cache : in out Handle;
With_Key : Key);
procedure Remove (An_Element_List : Element_List;
From_Cache : in out Handle;
With_Key : Key);
procedure Retrieve (Elements : out Element_List;
From_Cache : Handle;
With_Key : Key;
In_Context : String := "<DEFAULT>");
--
-- This operation does not raise FAILED when errors are detected
-- during the retrieval of ELEMENTS from FROM_CACHE. Instead, as
-- many valid elements as possible are retieved and placed in
-- ELEMENTS. When the complete success of the retrieval operation
-- must be known, STATUS and DIAGNOSIS can be queried after the call
-- to RETRIVE in order to determine if any problems were encountered
-- during the operation.
Failed : exception;
--
-- FAILED is raised when any of the above operations
-- cannot be successfully completed. STATUS and DIAGNOSIS
-- may be used to obtain additional information about the
-- nature of the failure.
function Diagnosis return String;
function Status return Errors.Condition;
function Debug_Image (Of_Handle : Handle;
Level : Natural;
Prefix : String;
Expand_Pointers : Boolean) return String;
--------------------------
-- Preferred Interfaces --
--------------------------
-- The following subprograms provide the same functionality as their
-- overloaded counterparts above, except that these subprograms
-- provide a STATUS parameter where appropriate and generally do not
-- raise the FAILED exception.
procedure Open (Cache : in out Handle;
Mode : Modes;
Name : String;
Status : in out Errors.Condition;
Action_Id : Action.Id := Action.Null_Id);
--
-- When ACTION_ID = ACTION.NULL_ID, an action managed by the
-- job is used by the open, and is finished as appropriate at
-- the end of the job. When ACTION_ID /= ACTION.NULL_ID,
-- ACTION_ID is used in subsequent operations and should be
-- finished by the client which started it.
procedure Close (Cache : in out Handle;
Status : in out Errors.Condition);
procedure Destroy (Cache : in out Handle;
Status : in out Errors.Condition);
type Storage_Formats is (Fully_Qualified,
Subsystem_Relative,
View_Relative);
--
-- Type STORAGE_FORMATS determines how elements are
-- represented in the cache. The permanent representation
-- used in the caches is equivalent to that provided in the
-- Ada_Program.Conversion.Convert operations. A summary of
-- the storage formats is provided below.
--
-- FULLY_QUALIFIED => The element's fully qualified resolution
-- is stored. This format is useful for
-- elements from non-subsystem contexts or
-- when subsystem/view information must be
-- saved.
--
-- SUBSYSTEM_RELATIVE => The resolution of the element is subsystem
-- relative. The subsystem name along with
-- an SPEC/LOAD view indication are stored.
-- This format is useful for elements in
-- subystem contexts when retreival is desired
-- in a potentially different view context. See
-- the IN_CONTEXT parameter on procedure RETRIEVE
-- below.
--
-- VIEW_RELATIVE => The resolution of the element is completely
-- view relative. No subsystem or SPEC/LOAD
-- indication is stored. This format is useful
-- for elements in subsystem contexts which will
-- ALWAYS be retrieved in a particular
-- subsystem/view pair.
procedure Add (An_Element : Element;
To_Cache : in out Handle;
With_Key : Key;
Status : in out Errors.Condition;
Format : Storage_Formats :=
Element_Cache.Subsystem_Relative);
--
-- Stores AN_ELEMENT in TO_CACHE under WITH_KEY in FORMAT
-- representation. If AN_ELEMENT was previously ADD'ed
-- with the same parameters, this operation is a no-op.
-- When a single element is ADD'ed to the same cache with
-- different values for the FORMAT parameter, separate
-- entries for each given format are stored.
--
-- NOTE: In order to REMOVE a given element from the cache,
-- the same values for WITH_KEY and FORMAT must be provided.
procedure Remove (An_Element : Element;
From_Cache : in out Handle;
With_Key : Key;
Status : in out Errors.Condition;
Format : Storage_Formats :=
Element_Cache.Subsystem_Relative);
--
-- Removes AN_ELEMENT stored under WITH_KEY from FROM_CACHE in
-- FORMAT representation. When AN_ELEMENT is not stored under
-- WITH_KEY in the specified FORMAT, UNDEFINED_ELEMENT is returned
-- in STATUS. When WITH_KEY is not defined in FROM_CACHE,
-- UNDEFINED_KEY is returned in STATUS.
procedure Add (An_Element_List : Element_List;
To_Cache : in out Handle;
With_Key : Key;
Status : in out Errors.Condition;
Format : Storage_Formats :=
Element_Cache.Subsystem_Relative);
--
-- Equivalent to single element ADD as defined above on each
-- element in AN_ELEMENT_LIST.
procedure Remove (An_Element_List : Element_List;
From_Cache : in out Handle;
With_Key : Key;
Status : in out Errors.Condition;
Format : Storage_Formats :=
Element_Cache.Subsystem_Relative);
--
-- Equivalent to single element REMOVE as defined above on each
-- element in AN_ELEMENT_LIST.
procedure Retrieve (Elements : out Element_List;
From_Cache : Handle;
With_Key : Key;
Status : in out Errors.Condition;
Format : Storage_Formats :=
Element_Cache.Subsystem_Relative;
In_Context : String := "<DEFAULT>");
--
-- Restores the ELEMENTS that were saved in FROM_CACHE under
-- WITH_KEY in FORMAT representation. The IN_CONTEXT parameter
-- determines how the resolution of saved elements will be
-- performed. In all cases, if the elements were saved in
-- FULLY_QUALIFED format this parameter is ignored. Otherwise, the
-- following algorithm is followed.
--
-- <DEFAULT> => For elements saved in SUBSYSTEM_RELATIVE format,
-- the view selected by the current activity and
-- the stored subsystem is used as the origin. The
-- spec or load origin of the representation is
-- used to choose the specific view. For elements
-- saved in VIEW_RELATIVE format, the current view
-- context is used as the origin.
--
-- Subsystem Name => For elements saved in SUBSYSTEM_RELATIVE format,
-- this behaves the same as <DEFAULT>. For elements
-- saved in VIEW_RELATIVE format, the view selected
-- by the current activity for the given subsystem
-- is used. The subsystem name can be followed by
-- "'SPEC" or "'LOAD" to force use of the spec view
-- or load view from the activity; DEFAULT: Spec View
--
-- View Name => For elements saved in SUBSYSTEM_RELATIVE format,
-- if the subsystem enclosing the given view name
-- matches the representation's subsystem, the
-- given view is used. Otherwise, this behaves
-- the same as <DEFAULT>. For elements saved in
-- VIEW_RELATIVE format the specified view is used.
----------------------
-- Cache Compaction --
----------------------
procedure Compactify (The_Cache : in out Handle;
Status : in out Errors.Condition);
--
-- Reorganizes cache data structures into a more optimal format.
-- Assert => MODE (THE_CACHE) /= READ.
--------------------------
-- Cache Handle Queries --
--------------------------
function Is_Open (Cache : Handle) return Boolean;
function Mode (Of_Cache : Handle) return Modes;
--
-- Raises FAILED when not IS_OPEN (OF_CACHE)
function Name (Of_Cache : Handle) return String;
--
-- Raises FAILED when not IS_OPEN (OF_CACHE)
function Object_Id (Of_Cache : Handle) return Directory.Object;
--
-- Raises FAILED when not IS_OPEN (OF_CACHE)
-------------------
-- Key Iterators --
-------------------
-- The following type and operations provide a means of
-- iterating over the set of keys defined for a given cache.
type Key_Iterator is private;
procedure Initialize (Iterator : in out Key_Iterator;
From_Cache : Handle);
function Done (Iterator : Key_Iterator) return Boolean;
function Value (Of_Iterator : Key_Iterator) return Key;
procedure Next (The_Iterator : in out Key_Iterator);
------------------------------
-- Predefined Status Values --
------------------------------
Undefined_Element : constant Errors.Error_Kinds :=
Errors.Make ("UNDEFINED_ELEMENT", Errors.Warn);
Undefined_Key : constant Errors.Error_Kinds :=
Errors.Make ("UNDEFINED_KEY", Errors.Warn);
pragma Subsystem (Design_Facility, Closed);
pragma Module_Name (4, 3593);
pragma Bias_Key (27);
private
type Handle_Data;
type Handle is access Handle_Data;
pragma Segmented_Heap (Handle);
type Key_Data;
type Key_Iterator is access Key_Data;
pragma Segmented_Heap (Key_Iterator);
end Element_Cache;
nblk1=f
nid=0
hdr6=1e
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tail 0x21521170a83c24752fa86 0x42a00088462065003