/// <summary>
/// 取消指定执行上下文关联的任务。
/// </summary>
/// <param name="context">执行上下文关联。</param>
public static void Cancel(this DataPumpControllableExecutionContext context)
{
if (context == null)
{
return;
}
ControllableDataPumpBase dataPump = context.Owner as ControllableDataPumpBase;
dataPump.Cancel(context);
}
/// <summary>
/// 取消指定执行上下文关联的任务。
/// </summary>
/// <param name="context">执行上下文关联。</param>
public static void Cancel(this DataPumpExecutionContext context)
{
DataPumpControllableExecutionContext contextEx = context as DataPumpControllableExecutionContext;
if (contextEx == null)
{
return;
}
Cancel(contextEx);
}
/// <summary>
/// 使用特定的执行上下文执行服务，并在第一次执行时初始化相关数据。
/// </summary>
/// <param name="context">执行上下文。</param>
protected sealed override void ExecuteCore(DataPumpControllableExecutionContext context)
{
if (!_isInited)
{
_isInited = InitAtFirstTime();
}
if (_isInited)
{
OverrideExecute(context);
}
}
/// <summary>
/// 执行数据泵。
/// </summary>
/// <param name="pump">元数据。</param>
/// <param name="savePath">保存路径。</param>
/// <param name="source">数据源。</param>
/// <param name="reporter">异步通知器。</param>
/// <param name="items">提取项列表。</param>
/// <returns>数据泵任务执行上下文。</returns>
public static DataPumpExecutionContext Execute(this Pump pump, String savePath, SourceFileItem source, IAsyncProgress reporter, IEnumerable <ExtractItem> items = null)
{
DataPumpBase dataPump = pump.GetDataPump();
DataPumpExecutionContext context = dataPump.CreateContext(pump, savePath, source);
DataPumpControllableExecutionContext contextEx = context as DataPumpControllableExecutionContext;
if (contextEx != null)
{
contextEx.Reporter = reporter;
}
dataPump.Execute(context);
return(context);
}
/// <summary>
/// 创建执行上下文。
/// </summary>
/// <param name="dataPump">数据泵。</param>
/// <param name="metaData">元数据。</param>
/// <param name="rootSavePath">保存路径。</param>
/// <param name="source">数据源。</param>
/// <param name="extractItems">提取项列表。</param>
/// <param name="asyn">异步通知器。</param>
/// <returns>执行上下文。</returns>
internal static DataPumpExecutionContext CreateContext(this DataPumpBase dataPump, Pump metaData, String rootSavePath, SourceFileItem source, IEnumerable <ExtractItem> extractItems, IAsyncProgress asyn = null)
{
DataPumpExecutionContext context = dataPump.CreateContext(metaData, rootSavePath, source);
context.ExtractItems = extractItems;
DataPumpControllableExecutionContext contextEx = context as DataPumpControllableExecutionContext;
if (contextEx != null)
{
contextEx.Reporter = asyn;
}
return(contextEx);
}
/// <summary>
/// 取消执行。
/// </summary>
public virtual void Cancel(DataPumpControllableExecutionContext context)
{
if (context.Owner != this)
{
return;
}
if ((context.Status == AsyncProgressState.Starting) ||
(context.Status == AsyncProgressState.Running))
{
context.Reporter.Stop();
context.CancellationTokenSource.Cancel();
context.Reset();
}
}
/// <summary>
/// 使用特定的执行上下文执行服务。
/// </summary>
/// <param name="context">执行上下文。</param>
protected sealed override void ExecuteCore(DataPumpExecutionContext context)
{
DataPumpControllableExecutionContext contextEx = context as DataPumpControllableExecutionContext;
if (contextEx == null)
{
throw new InvalidOperationException("context is not DataPumpControllableExecutionContext");
}
if (contextEx.Status == AsyncProgressState.Running || contextEx.Status == AsyncProgressState.Starting)
{
return;
}
ExecuteCore(contextEx);
}
/// <summary>
/// 取消执行。
/// </summary>
public virtual void Cancel(DataPumpControllableExecutionContext context)
{
if (context.Owner != this)
{
return;
}
//枚举值高字节如果为0x01，表示正在执行
if (((Int32)context.Status & 0xFF00) == 0x0100)
{
context.Reporter.StopAll();
context.CancellationTokenSource.Cancel();
context.Reset();
}
}
/// <summary>
/// 执行数据泵。
/// </summary>
/// <param name="dataPump">元数据。</param>
/// <param name="source">数据源。</param>
/// <param name="reporter">异步通知器。</param>
/// <param name="items">提取项列表。</param>
/// <returns>数据泵任务执行上下文。</returns>
public static DataPumpExecutionContext Execute(this DataPumpBase dataPump, SourceFileItem source, MultiTaskReporterBase reporter, params ExtractItem[] items)
{
DataPumpExecutionContext context = dataPump.CreateContext(source);
context.ExtractItems = items;
DataPumpControllableExecutionContext contextEx = context as DataPumpControllableExecutionContext;
if (contextEx != null)
{
contextEx.Reporter = reporter;
}
dataPump.Execute(context);
return(context);
}
public void Extract(SourceFileItem item, IAsyncProgress asyn)
{
if (Context == null)
{
return;
}
Context.UnsafeSource = item;
DataPumpControllableExecutionContext contextEx = Context as DataPumpControllableExecutionContext;
if (contextEx != null)
{
contextEx.Reporter = asyn;
}
DataPump.Execute(Context);
}
/// <summary>
/// 初始化当前的执行流程。
/// </summary>
/// <param name="context">执行上下文。</param>
/// <returns>成功返回true；否则返回false。</returns>
protected virtual Boolean InitExecution(DataPumpControllableExecutionContext context)
{
return(true);
}
/// <summary> /// 使用特定的执行上下文执行服务。 /// </summary> /// <param name="context">执行上下文。</param> protected abstract void ExecuteCore(DataPumpControllableExecutionContext context);
/// <summary> /// 使用特定的执行上下文执行服务。 /// </summary> /// <param name="context">执行上下文。</param> protected abstract void OverrideExecute(DataPumpControllableExecutionContext context);