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MemoryStore.pas
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// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
unit
MemoryStore;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
interface
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
uses
Classes,
Contnrs,
SysUtils;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
const
MEMORY_STORE_64KB_BLOCK_SIZE = 65536;
MEMORY_STORE_128KB_BLOCK_SIZE = 131072;
MEMORY_STORE_256KB_BLOCK_SIZE = 262144;
MEMORY_STORE_512KB_BLOCK_SIZE = 524288;
MEMORY_STORE_1024KB_BLOCK_SIZE = 1048576;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
IMemoryStore = interface(IInterface)
function GetMemory(Size: Cardinal): Pointer;
procedure FreeMemory(Address: Pointer);
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
TType1MemoryStore = class(TInterfacedObject, IMemoryStore)
private
MemoryBlockSize: Cardinal;
MemoryBlockList: TList;
PositionInCurrentMemoryBlock: Cardinal;
public
constructor Create(MemoryBlockSize: Cardinal);
function GetMemory(Size: Cardinal): Pointer;
procedure FreeMemory(Address: Pointer);
destructor Destroy; override;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
TType2MemoryStore = class(TInterfacedObject, IMemoryStore)
private
MemoryBlockSize: Cardinal;
MemoryBlockList: TList;
PositionInCurrentMemoryBlock: Cardinal;
AllocationBlockSize: Cardinal;
AllocationBlockList: TQueue;
public
constructor Create(MemoryBlockSize: Cardinal; AllocationBlockSize: Cardinal);
function GetMemory(Size: Cardinal): Pointer;
procedure FreeMemory(Address: Pointer);
destructor Destroy; override;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
implementation
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
uses
MemoryManager;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
constructor TType1MemoryStore.Create(MemoryBlockSize: Cardinal);
begin
Self.MemoryBlockSize := MemoryBlockSize;
Self.MemoryBlockList := TList.Create;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function TType1MemoryStore.GetMemory(Size: Cardinal): Pointer;
var
MemoryBlockPointer: Pointer;
begin
if (Self.MemoryBlockList.Count = 0) or (Size > (Self.MemoryBlockSize - Self.PositionInCurrentMemoryBlock)) then begin
MemoryBlockPointer := TMemoryManager.GetMemory(Self.MemoryBlockSize);
Self.MemoryBlockList.Add(MemoryBlockPointer);
Result := MemoryBlockPointer;
Self.PositionInCurrentMemoryBlock := Size;
end else begin
Result := Pointer(Cardinal(Self.MemoryBlockList.Last) + Self.PositionInCurrentMemoryBlock);
Inc(Self.PositionInCurrentMemoryBlock, Size);
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TType1MemoryStore.FreeMemory(Address: Pointer);
begin
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
destructor TType1MemoryStore.Destroy;
var
i: Integer;
begin
if (Self.MemoryBlockList.Count > 0) then begin
for i := 0 to (Self.MemoryBlockList.Count - 1) do begin
TMemoryManager.FreeMemory(Self.MemoryBlockList[i], Self.MemoryBlockSize);
end;
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
constructor TType2MemoryStore.Create(MemoryBlockSize: Cardinal; AllocationBlockSize: Cardinal);
begin
Self.MemoryBlockSize := MemoryBlockSize;
Self.MemoryBlockList := TList.Create;
Self.AllocationBlockSize := AllocationBlockSize;
Self.AllocationBlockList := TQueue.Create;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function TType2MemoryStore.GetMemory(Size: Cardinal): Pointer;
var
MemoryBlockPointer: Pointer;
begin
if (Self.AllocationBlockList.Count > 0) then begin
Result := Self.AllocationBlockList.Pop; Exit;
end;
if (Self.MemoryBlockList.Count = 0) or (Self.AllocationBlockSize > (Self.MemoryBlockSize - Self.PositionInCurrentMemoryBlock)) then begin
MemoryBlockPointer := TMemoryManager.GetMemory(Self.MemoryBlockSize);
Self.MemoryBlockList.Add(MemoryBlockPointer);
Result := MemoryBlockPointer;
Self.PositionInCurrentMemoryBlock := Self.AllocationBlockSize;
end else begin
Result := Pointer(Cardinal(Self.MemoryBlockList.Last) + Self.PositionInCurrentMemoryBlock);
Inc(Self.PositionInCurrentMemoryBlock, Self.AllocationBlockSize);
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TType2MemoryStore.FreeMemory(Address: Pointer);
begin
Self.AllocationBlockList.Push(Address);
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
destructor TType2MemoryStore.Destroy;
var
i: Integer;
begin
if (Self.MemoryBlockList.Count > 0) then begin
for i := 0 to (Self.MemoryBlockList.Count - 1) do begin
TMemoryManager.FreeMemory(Self.MemoryBlockList[i], Self.MemoryBlockSize);
end;
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
end.