/// <summary>
/// 返回队列中第一个，如果队列为空，则返回 null;
/// </summary>
/// <returns></returns>
private TMaterial PopMaterial()
{
if (MaterialBufferSize == 0)
{
return(default(TMaterial));
}
var nextMaterial = MaterialBuffers[0];
MaterialBuffers.RemoveAt(0);
return(nextMaterial);
}
//从缓存中读取
private bool TryGetCurrentFromBuffer()
{
//读取缓存
TMaterial material = MaterialBuffers.Pop();
if (material == null)
{
log.Info(Name + "缓存数据读取结束！"); OnCompleted(); return(false);
}
this.Current = (material);
return(true);
}
/// <summary>
/// 添加原料到缓存，这是一个原料入口。
/// </summary>
/// <param name="nextBufferMaterial"></param>
private void AppendMaterialToBuffer(TMaterial nextBufferMaterial)
{
OnMaterialInputted(nextBufferMaterial);
MaterialBuffers.Add(nextBufferMaterial);
}
/// <summary>
/// 移动到下一条，如要设置了缓存，则先填充缓存。
/// </summary>
/// <returns></returns>
public override bool MoveNext()
{
if (this.DataSource.IsCancel || IsCancel)
{
log.Info(Name + "缓存数据流已经被取消！"); OnCompleted(); return(false);
}
//先获取一个原料
TMaterial next = default(TMaterial);
if (!IsMaterialEnded)
{
next = GetNextMaterial();
}//先获取一个原料
//如果为空，则尝试读取缓存，并直接返回结果
if (next == null)
{
return(TryGetCurrentFromBuffer());
}
//检核是否合格,不合格则继续读取
if (!OnMaterialCheck(next))
{
return(MoveNext());
}
else
{
OnAfterMaterialCheckPassed(next);
}
//检查缓存是否已满,若是，弹出最先进入的一个作为当前结果，并添加缓存
if (MaterialBuffers.IsFull)
{
this.Current = MaterialBuffers.Pop();
OnMaterialProducing(this.Current);
AppendMaterialToBuffer(next);
return(true);
}
else//没有满，则继续添加
{
AppendMaterialToBuffer(next);
if (MaterialBuffers.IsFull)
{
log.Info(Name + "缓存数据流已经填满！");
OnMaterialBuffersFullOrEnd(MaterialBuffers);
}
//直接快速填满，避免迭代过多，堆栈溢出
for (int i = MaterialBuffers.Count; i < MaterialBuffers.WindowSize; i++)
{
next = GetNextMaterial();
//如果为空，则尝试读取缓存，并直接返回结果
if (next == null)
{
return(TryGetCurrentFromBuffer());
}
//检核是否合格,不合格则继续读取
if (!OnMaterialCheck(next))
{
return(MoveNext());
}
else
{
OnAfterMaterialCheckPassed(next);
}
AppendMaterialToBuffer(next);
}
return(MoveNext());
}
}
