Question

我发现在我维护的应用程序中存在性能瓶颈，其中使用奇怪的技术来本地化用户界面。

名称值对存储在一个非常大的THashedStringList中，并且通过对

的所有调用给出了瓶颈（分析器结果）

THashedStringList.IndexOfName

和

THashedStringList.ValueFromIndex

不知何故，我希望有一个更快的类，以某种方式可以使用类似的签名（indexOfName和ValueFromIndex），这样我可以实现性能提升，而无需重写这个奇怪但有效的本地化机制。这段代码最初是用Delphi 2009编写的，我认为，但现在我有西雅图。

感谢。

Answer 1

我不能在这里发布代码（只是界面），因为它太大了，但是如果你继续使用alcinoe（https://github.com/Zeus64/alcinoe）你有一套类似于组件的TStringlist，特别是一个名为TALHashedStringList的与THashedStringList完全一样，但在内部使用TDictionnary（所以现在TALHashedStringList.IndexOfName和TALHashedStringList.ValueFromIndex的时间必须为null）

  {----------------------------------}
  TALHashedStringList = class(TALStrings)
  private
    FNodeList: TObjectList<TALHashedStringListDictionaryNode>;
    FDictionary: TALObjectDictionary<ansiString, TALHashedStringListDictionaryNode>;
    FDuplicates: TDuplicates;
    FOnChange: TNotifyEvent;
    FOnChanging: TNotifyEvent;
    FOwnsObject: Boolean;
    FCaseSensitive: boolean;
    procedure ExchangeItems(Index1, Index2: Integer);
    procedure QuickSort(L, R: Integer; SCompare: TALHashedStringListSortCompare);
    procedure SetCaseSensitive(const Value: Boolean);
    function GetCaseSensitive: Boolean;
    Function ExtractNameValue(const S: AnsiString; var Name, Value: AnsiString): Boolean;
    procedure SetDuplicates(const Value: TDuplicates);
    function CreateDictionary(ACapacity: integer; aCaseSensitive: boolean): TALObjectDictionary<ansiString, TALHashedStringListDictionaryNode>;
  protected
    function GetName(Index: Integer): AnsiString; override;
    function GetStrictName(Index: Integer): AnsiString; override; // [added from Tstrings]
    function GetValue(const Name: AnsiString): AnsiString; override;
    procedure SetValue(const Name, Value: AnsiString); override;
    function GetValueFromIndex(Index: Integer): AnsiString; override;
    procedure SetValueFromIndex(Index: Integer; const Value: AnsiString); override;
    procedure SetPersistentValue(const Name, Value: AnsiString); override; // [added from Tstrings]
    procedure SetPersistentValueFromIndex(Index: Integer; const Value: AnsiString); override; // [added from Tstrings]
    procedure Changed; virtual;
    procedure Changing; virtual;
    function Get(Index: Integer): AnsiString; override;
    function GetCount: Integer; override;
    function GetObject(Index: Integer): TObject; override;
    function GetTextStr: AnsiString; override;
    procedure Put(Index: Integer; const S: AnsiString); override;
    procedure PutObject(Index: Integer; AObject: TObject); override;
    procedure SetCapacity(NewCapacity: Integer); override;
    procedure SetUpdateState(Updating: Boolean); override;
    procedure InsertItem(Index: Integer; const Name, Value: AnsiString; AObject: TObject); overload; virtual;
    procedure InsertItem(Index: Integer; const S: AnsiString; AObject: TObject); overload; virtual;
    procedure AssignTo(Dest: TPersistent); override; //[added from Tstrings]
    procedure init(OwnsObjects: Boolean; ACapacity: Integer); virtual; //[added from TStringList]
  public
    constructor Create; overload; override;
    constructor Create(OwnsObjects: Boolean); reintroduce; overload;
    constructor Create(ACapacity: Integer); reintroduce; overload; //[added from Tstrings]
    constructor Create(OwnsObjects: Boolean; ACapacity: Integer); reintroduce; overload; //[added from Tstrings]
    destructor Destroy; override;
    function Add(const S: AnsiString): Integer; override;
    function AddObject(const S: AnsiString; AObject: TObject): Integer; override;
    function AddNameValue(const Name, Value: AnsiString): Integer; override; // [added from Tstrings]
    function AddNameValueObject(const Name, Value: AnsiString; AObject: TObject): Integer; override; // [added from Tstrings]
    procedure Assign(Source: TPersistent); override;
    procedure Clear; override;
    procedure Delete(Index: Integer); override;
    function  ExtractObject(Index: Integer): TObject; overload; virtual;
    procedure Exchange(Index1, Index2: Integer); override;
    function IndexOf(const S: AnsiString): Integer; override;
    function IndexOfName(const Name: AnsiString): Integer; override; // [added from TStringList]
    procedure Insert(Index: Integer; const S: AnsiString); override;
    procedure InsertObject(Index: Integer; const S: AnsiString; AObject: TObject); override;
    procedure InsertNameValue(Index: Integer; const Name, Value: AnsiString); override; // [added from Tstrings]
    procedure InsertNameValueObject(Index: Integer; const Name, Value: AnsiString; AObject: TObject); override; // [added from Tstrings]
    procedure Move(CurIndex, NewIndex: Integer); override;
    procedure CustomSort(Compare: TALHashedStringListSortCompare); virtual;
    property Duplicates: TDuplicates read FDuplicates write SetDuplicates;
    property CaseSensitive: Boolean read GetCaseSensitive write SetCaseSensitive;
    property OnChange: TNotifyEvent read FOnChange write FOnChange;
    property OnChanging: TNotifyEvent read FOnChanging write FOnChanging;
    property OwnsObjects: Boolean read FOwnsObject write FOwnsObject;
  end;

你可以看到这个演示的表现： https://svn.code.sf.net/p/alcinoe/code/demos/ALSortedListBenchmark/win32/ALSortedListBenchmark.exe

THashedStringList在查找项目时提供更高效的替代方案

1 个答案: