/// <summary>
/// 从数据库得到对象的图片
/// </summary>
/// <param name="id"></param>
/// <param name="propertyName"></param>
/// <param name="timePoint"></param>
/// <returns></returns>
public SchemaObjectPhoto LoadObjectPhoto(string id, string propertyName, DateTime timePoint)
{
SchemaObjectPhoto result = null;
SchemaObjectBase obj = SchemaObjectAdapter.Instance.Load(id, timePoint);
if (obj != null)
{
if (obj.Properties.ContainsKey(propertyName))
{
ImageProperty imgInfo = JSONSerializerExecute.Deserialize <ImageProperty>(obj.Properties[propertyName].StringValue);
if (imgInfo != null)
{
MaterialContent mc = MaterialContentAdapter.Instance.Load(builder => builder.AppendItem("CONTENT_ID", imgInfo.ID)).FirstOrDefault();
if (mc != null)
{
result = new SchemaObjectPhoto()
{
ImageInfo = imgInfo, ContentData = mc.ContentData
}
}
;
}
}
}
return(result);
}
public void ProcessRequest(HttpContext context)
{
string id = context.Request["id"];
try
{
id.NullCheck("id");
SchemaObjectPhoto photo = null;
if (context.Request["time"] == "now")
{
TimePointContext tpc = TimePointContext.GetCurrentState();
try
{
TimePointContext.Current.SimulatedTime = DateTime.MinValue;
TimePointContext.Current.UseCurrentTime = true;
photo = SchemaObjectAdapter.Instance.GetObjectPhoto(id, "PhotoKey", DateTime.MinValue);
}
finally
{
TimePointContext.RestoreCurrentState(tpc);
}
}
else
{
photo = SchemaObjectAdapter.Instance.GetObjectPhoto(id, "PhotoKey", TimePointContext.Current.SimulatedTime);
}
if (photo != null)
{
ResponsePhoto(WebUtility.GetContentTypeByFileName(photo.ImageInfo.OriginalName), photo.ContentData);
}
else
{
ReponseDefaultPhoto();
}
}
catch (System.Exception)
{
ReponseDefaultPhoto();
}
}
/// <summary>
/// 从Cache中获取图片
/// </summary>
/// <param name="id"></param>
/// <param name="propertyName"></param>
/// <param name="timePoint"></param>
/// <returns></returns>
public SchemaObjectPhoto GetObjectPhoto(string id, string propertyName, DateTime timePoint)
{
SchemaObjectPhotoKey cacheKey = new SchemaObjectPhotoKey()
{
ObjectID = id, PropertyName = propertyName, TimePoint = timePoint
};
return(SchemaObjectPhotoCache.Instance.GetOrAddNewValue(cacheKey, (cache, key) =>
{
SchemaObjectPhoto photo = LoadObjectPhoto(id, propertyName, timePoint);
MixedDependency dependency = new MixedDependency(new UdpNotifierCacheDependency(), new MemoryMappedFileNotifierCacheDependency());
cache.Add(cacheKey, photo, dependency);
return photo;
}));
}
