我习惯于创建TThread后代来进行长时间的数据库操作。我通常的构造看起来像这样:
interface
type
TMyDBOp = class(TThread)
private
FConnection: TADOConnection;
FCommand1: TADOCommand;
FCommand2: TADOCommand; // and many more privated objects, vars ...
procedure InitDB;
procedure DoneDB;
procedure DoDBStuff; // and many more procedures and functions to structure the code
protected
procedure Execute; override;
public
constructor Create; reintroduce;
property X: T... // and many more properties to set on thread creation
end;
implementation
constructor TMyDBOp.Create;
begin
inherited Create(False);
end;
procedure TMyDBOp.InitDB;
begin
FConnection:= TADOConnection.Create(nil);
// setup all connection props, setup all other components
end;
procedure TMyDBOp.DoneDb;
begin
FConnection.Close; // and Free, and Free all other components
end;
procedure TMyDBOp.DoDBStuff;
begin
// Execute FCommands, do some calculations, call other TMyDBOp methods etc. etc.
end;
procedure TMyDBOp.Execute;
begin
Try
Coinitialize;
InitDB;
try
DoDBStuff;
finally
DoneDB;
End;
Except
// catch, log, report exceptions ....
End;
end;
然后我显然使用
这个类var
DBOp: TMyDBOp;
begin
DBOp:= TMyDBOp.Create;
DBOp.Property1:= xyz; // and set all other props
DBOp.OnTerminate:= DBOpTerminated; // procedure to catch the thread and read back the results etc. etc.
DBOp.Resume;
end;
当然我通常将DBOp设置为另一个组件var,以便能够终止,或者等待线程。
现在我想重写这些TThread类并使用OmniThreadLibrary的simillar构造。我该怎么做?我的意思是:用什么基类来定义所有类组件和属性?
- 它应该是TOmniWorker的后代吗?那么执行程序在哪里?
- 它应该是TObject后代,然后将OTLTaks创建为CreateTask(DBOp.Execute)
吗?
- 它应该是我作为CreateTask(anonymous method that reads the parameter and calls its Execute)
创建的OTLTask的参数传递的TObject吗?
感谢任何提示。
编辑:(基于gabrs对澄清的评论) 我的观点是OTL源中的所有样本/测试只显示一个简单的用法。大多数基本的“单程序”线程。对于我的情况,我需要一个相当复杂的类,子组件和子程序都在一个线程中运行。我正在寻找这样一个阶级的祖先及其设计模式。