socket hash

socket hash

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unit uSocketHash;   interface   uses SyncObjs;   type   {$IF CompilerVersion >= 22}  //XE=22,2010=21      TSocket = NativeUInt;   {$ELSE}      TSocket = Integer;   {$IFEND}     PPSocketHashItem = ^PSocketHashItem;   PSocketHashItem = ^TSocketHashItem;   TSocketHashItem = record     Next: PSocketHashItem;     Key : TSocket;     Value:Pointer;   end;     TSocketHash = class   private     FBucketPool:array of PSocketHashItem;     Buckets: array of PSocketHashItem;     function NewBucket():PSocketHashItem;     procedure DisposeBucket(Value:PSocketHashItem);   protected     function Find(const Key: TSocket): PPSocketHashItem;     function HashOf(const Key: TSocket): Cardinal; virtual;   public     constructor Create(Size: Cardinal = 256);     destructor Destroy; override;     function Add(const Key: TSocket; Value: Pointer):Integer;     procedure Clear;     procedure Remove(const Key: TSocket);     function Modify(const Key: TSocket; Value: Pointer): Boolean;     function ValueOf(const Key: TSocket): Pointer;   end;     TThreadSocketHash = class   private     FObj:TSocketHash;     FCS:TCriticalSection;     procedure Lock();     procedure UnLock();   public     constructor Create(Size: Cardinal = 256);     destructor Destroy; override;     function Add(const Key: TSocket; Value: Pointer):Integer;     procedure Clear;     procedure Remove(const Key: TSocket);     function Modify(const Key: TSocket; Value: Pointer): Boolean;     function ValueOf(const Key: TSocket): Pointer;     function GetAndRemove(const Key:TSocket):Pointer;   end;     implementation   function TSocketHash.Add(const Key: TSocket; Value: Pointer):Integer; var   Hash: Integer;   Bucket: PSocketHashItem; begin   Bucket:= NewBucket();   if Bucket <> nil then   begin     Hash := HashOf(Key) mod Cardinal(Length(Buckets));     Bucket^.Key := Key;     Bucket^.Value := Value;     Bucket^.Next := Buckets[Hash];     Buckets[Hash] := Bucket;     Result := Hash;   end   else Result := -1;//空间满 end;   procedure TSocketHash.Clear; var   I: Integer;   P, N: PSocketHashItem; begin   for I := 0 to Length(Buckets) - 1 do   begin     P := Buckets[I];     while P <> nil do     begin       N := P^.Next;       DisposeBucket(P);       P := N;     end;     Buckets[I] := nil;   end; end;   constructor TSocketHash.Create(Size: Cardinal); var   Index:Integer;   PH:PSocketHashItem; begin   inherited Create;   SetLength(Buckets, Size);   SetLength(FBucketPool,Size); //:array of PSocketHashItem;   for Index := Low(FBucketPool) to High(FBucketPool) do   begin     New(PH);     PH^.Next  := nil;     PH^.Key   := 0;     PH^.Value := nil;     FBucketPool[Index] := PH;   end; end;   destructor TSocketHash.Destroy; var   Index:Integer;   P:PSocketHashItem; begin   Clear;   for Index := Low(FBucketPool) to High(FBucketPool) do   begin     P := FBucketPool[Index];     if P <> nil then Dispose(P);   end;   inherited Destroy; end;   procedure TSocketHash.DisposeBucket(Value: PSocketHashItem); var   Index:Integer; begin   for Index := Low(FBucketPool) to High(FBucketPool) do   begin     if FBucketPool[Index] = nil then     begin       FBucketPool[Index] := Value;       Break;     end;   end; end;   function TSocketHash.Find(const Key: TSocket): PPSocketHashItem; var   Hash: Integer; begin   Hash := HashOf(Key) mod Cardinal(Length(Buckets));   Result := @Buckets[Hash];   while Result^ <> nil do   begin     if Result^.Key = Key then       Exit     else       Result := @Result^.Next;   end; end;   function TSocketHash.HashOf(const Key: TSocket): Cardinal; var   I: Integer;   P: PByte; begin   Result := 0;   P := @Key;    for I := 1 to SizeOf(Key) do    begin      Result := ((Result shl 2) or (Result shr (SizeOf(Result) * 8 - 2))) xor P^;      Inc(P);    end; end;   function TSocketHash.Modify(const Key: TSocket; Value: Pointer): Boolean; var   P: PSocketHashItem; begin   P := Find(Key)^;   if P <> nil then   begin     Result := True;     P^.Value := Value;   end   else     Result := False; end;   function TSocketHash.NewBucket: PSocketHashItem; var   Index:Integer; begin   Result := nil;   for Index := Low(FBucketPool) to High(FBucketPool) do   begin     Result := FBucketPool[Index];     if Result <> nil then     begin       FBucketPool[Index] := nil;       Break;     end;   end; end;   procedure TSocketHash.Remove(const Key: TSocket); var   P: PSocketHashItem;   Prev: PPSocketHashItem; begin   Prev := Find(Key);   P := Prev^;   if P <> nil then   begin     Prev^ := P^.Next;     DisposeBucket(P);   end; end;   function TSocketHash.ValueOf(const Key: TSocket): Pointer; var   P: PSocketHashItem; begin   P := Find(Key)^;   if P <> nil then     Result := P^.Value   else     Result := nil;// -1; end;       { TThreadSocketHash }   function TThreadSocketHash.Add(const Key: TSocket; Value: Pointer):Integer; begin   Lock();   try     Result := FObj.Add(Key,Value);   finally     UnLock();   end; end;   procedure TThreadSocketHash.Clear; begin   Lock();   try     FObj.Clear();   finally     UnLock();   end; end;   constructor TThreadSocketHash.Create(Size: Cardinal); begin   FObj := TSocketHash.Create(Size);   FCS := TCriticalSection.Create(); end;   destructor TThreadSocketHash.Destroy; begin   FCS.Free();   FObj.Free();   inherited; end;   function TThreadSocketHash.GetAndRemove(const Key: TSocket): Pointer; begin   Lock();   try     Result := FObj.ValueOf(Key);     FObj.Remove(Key);   finally     UnLock();   end; end;   procedure TThreadSocketHash.Lock; begin   FCS.Enter(); end;   function TThreadSocketHash.Modify(const Key: TSocket; Value: Pointer): Boolean; begin   Lock();   try     Result := FObj.Modify(Key,Value);   finally     UnLock();   end; end;   procedure TThreadSocketHash.Remove(const Key: TSocket); begin   Lock();   try     FObj.Remove(Key);   finally     UnLock();   end; end;   procedure TThreadSocketHash.UnLock; begin   FCS.Leave(); end;   function TThreadSocketHash.ValueOf(const Key: TSocket): Pointer; begin   Lock();   try     Result := FObj.ValueOf(Key);   finally     UnLock();   end; end;   end.