public override int SaveChanges(SaveOptions options)
{
int returnValue = 0;
// 因为我们不调用base.SaveChanges, 我们必须手动关闭链接.
// 否则我们将留下许多打开的链接, 最终导致链接瓶颈.
// Entity Framework提供了base.SaveChanges内部使用的EnsureConnection和ReleaseConnection.
// 这些是内部方法, 所以我们必须使用反射调用它们.
var EnsureConnectionMethod = typeof(ObjectContext).GetMethod(
"EnsureConnection", BindingFlags.Instance | BindingFlags.NonPublic);
EnsureConnectionMethod.Invoke(this, null);
// 使用ObjectStateManager.GetObjectStateEntries完成增加,修改,和删除集合.
foreach (ObjectStateEntry ose in this.ObjectStateManager.GetObjectStateEntries(EntityState.Added))
{
Travel travel = ose.Entity as Travel;
if (travel != null)
{
RetryPolicy retryPolicy = new RetryPolicy();
retryPolicy.Task = new Action(() =>
{
this.InsertIntoTravel(travel.PartitionKey,
travel.Place, travel.GeoLocationText, travel.Time);
});
retryPolicy.Execute();
returnValue++;
}
}
foreach (ObjectStateEntry ose in this.ObjectStateManager.GetObjectStateEntries(EntityState.Modified))
{
Travel travel = ose.Entity as Travel;
if (travel != null)
{
RetryPolicy retryPolicy = new RetryPolicy();
retryPolicy.Task = new Action(() =>
{
this.UpdateTravel(travel.PartitionKey,
travel.RowKey, travel.Place, travel.GeoLocationText, travel.Time);
});
retryPolicy.Execute();
returnValue++;
}
}
foreach (ObjectStateEntry ose in this.ObjectStateManager.GetObjectStateEntries(EntityState.Deleted))
{
Travel travel = ose.Entity as Travel;
if (travel != null)
{
RetryPolicy retryPolicy = new RetryPolicy();
retryPolicy.Task = new Action(() =>
{
this.DeleteFromTravel(travel.PartitionKey, travel.RowKey);
});
retryPolicy.Execute();
returnValue++;
}
}
var ReleaseConnectionMethod = typeof(ObjectContext).
GetMethod("ReleaseConnection", BindingFlags.Instance | BindingFlags.NonPublic);
ReleaseConnectionMethod.Invoke(this, null);
return returnValue;
}
public override int SaveChanges(SaveOptions options)
{
int returnValue = 0;
// Since we do not call base.SaveChanges, we have to take care of connections manually.
// Otherwise we may leave a lot of connections open, which results in connection throttle.
// Entity Framework provides EnsureConnection and ReleaseConnection which base.SaveChanges uses internally.
// They're internal methods, so we have to use reflection to invoke them.
var EnsureConnectionMethod = typeof(ObjectContext).GetMethod(
"EnsureConnection", BindingFlags.Instance | BindingFlags.NonPublic);
EnsureConnectionMethod.Invoke(this, null);
// Use ObjectStateManager.GetObjectStateEntries to obtain added, modified, and deleted entities.
foreach (ObjectStateEntry ose in this.ObjectStateManager.GetObjectStateEntries(EntityState.Added))
{
Travel travel = ose.Entity as Travel;
if (travel != null)
{
RetryPolicy retryPolicy = new RetryPolicy();
retryPolicy.Task = new Action(() =>
{
this.InsertIntoTravel(travel.PartitionKey,
travel.Place, travel.GeoLocationText, travel.Time);
});
retryPolicy.Execute();
returnValue++;
}
}
foreach (ObjectStateEntry ose in this.ObjectStateManager.GetObjectStateEntries(EntityState.Modified))
{
Travel travel = ose.Entity as Travel;
if (travel != null)
{
RetryPolicy retryPolicy = new RetryPolicy();
retryPolicy.Task = new Action(() =>
{
this.UpdateTravel(travel.PartitionKey,
travel.RowKey, travel.Place, travel.GeoLocationText, travel.Time);
});
retryPolicy.Execute();
returnValue++;
}
}
foreach (ObjectStateEntry ose in this.ObjectStateManager.GetObjectStateEntries(EntityState.Deleted))
{
Travel travel = ose.Entity as Travel;
if (travel != null)
{
RetryPolicy retryPolicy = new RetryPolicy();
retryPolicy.Task = new Action(() =>
{
this.DeleteFromTravel(travel.PartitionKey, travel.RowKey);
});
retryPolicy.Execute();
returnValue++;
}
}
var ReleaseConnectionMethod = typeof(ObjectContext).
GetMethod("ReleaseConnection", BindingFlags.Instance | BindingFlags.NonPublic);
ReleaseConnectionMethod.Invoke(this, null);
return(returnValue);
}