如果您想避免为每个客户端-服务器数据交换创建线程类所带来的开销,您可以创建一个可移动的线程类,如
http://delphidicas.blogspot.com/2008/08/anonymous-methods-when-should-they-be.html中所述。我几天前也遇到了同样的问题,所以我编写了一个名为TMotileThreading的类,它具有静态函数,让我使用D2009的新匿名方法特性创建线程。大致如下:
type
TExecuteFunc = reference to procedure;
TMotileThreading = class
public
class procedure Execute (Func : TExecuteFunc);
class procedure ExecuteThenCall (Func : TExecuteFunc; ThenFunc : TExecuteFunc);
end;
第二个过程允许我像您的情况一样执行客户端-服务器通信,并在数据到达时执行一些操作。匿名方法的好处是可以使用调用上下文的局部变量。因此,通信看起来像这样:
var
NewData : String;
begin
TMotileThreading.ExecuteThenCall (
procedure
begin
NewData := IdTCPClient.IOHandler.Readln;
end,
procedure
begin
GUIUpdate (NewData);
end);
end;
Execute和ExecuteThenCall方法简单地创建一个工作线程,将FreeOnTerminate设置为true以简化内存管理,并在工作线程的Execute和OnTerminate过程中执行提供的函数。
希望这可以帮助你。
编辑(根据要求,完整实现类TMotileThreading)
type
TExecuteFunc = reference to procedure;
TMotileThreading = class
protected
constructor Create;
public
class procedure Execute (Func : TExecuteFunc);
class procedure ExecuteAndCall (Func : TExecuteFunc; OnTerminateFunc : TExecuteFunc;
SyncTerminateFunc : Boolean = False);
end;
TMotile = class (TThread)
private
ExecFunc : TExecuteFunc;
TerminateHandler : TExecuteFunc;
SyncTerminateHandler : Boolean;
public
constructor Create (Func : TExecuteFunc); overload;
constructor Create (Func : TExecuteFunc; OnTerminateFunc : TExecuteFunc;
SyncTerminateFunc : Boolean); overload;
procedure OnTerminateHandler (Sender : TObject);
procedure Execute; override;
end;
implementation
constructor TMotileThreading.Create;
begin
Assert (False, 'Class TMotileThreading shouldn''t be used as an instance');
end;
class procedure TMotileThreading.Execute (Func : TExecuteFunc);
begin
TMotile.Create (Func);
end;
class procedure TMotileThreading.ExecuteAndCall (Func : TExecuteFunc;
OnTerminateFunc : TExecuteFunc;
SyncTerminateFunc : Boolean = False);
begin
TMotile.Create (Func, OnTerminateFunc, SyncTerminateFunc);
end;
constructor TMotile.Create (Func : TExecuteFunc);
begin
inherited Create (True);
ExecFunc := Func;
TerminateHandler := nil;
FreeOnTerminate := True;
Resume;
end;
constructor TMotile.Create (Func : TExecuteFunc; OnTerminateFunc : TExecuteFunc;
SyncTerminateFunc : Boolean);
begin
inherited Create (True);
ExecFunc := Func;
TerminateHandler := OnTerminateFunc;
SyncTerminateHandler := SyncTerminateFunc;
OnTerminate := OnTerminateHandler;
FreeOnTerminate := True;
Resume;
end;
procedure TMotile.Execute;
begin
ExecFunc;
end;
procedure TMotile.OnTerminateHandler (Sender : TObject);
begin
if Assigned (TerminateHandler) then
if SyncTerminateHandler then
Synchronize (procedure
begin
TerminateHandler;
end)
else
TerminateHandler;
end;