Node Callbacks

Francisco_Alcala-Soler_(iaea_001user3_-_(deleted))

Message from via eLinkHi, I have some questions about callbacks. I have a custom node on whichI'd like to perform some adhoc database actions whenever it gets deleted. Ihave implemented such database actions in the LLNODE's NodeDeleteSubclassPremethod and they work well whenever I delete an instance of the node. However, when the node is deleted because its parent folder has beendeleted, the database actions in the above method do not get executed. Ihave seen that the only way (that I know of) to have those actions performedin all cases is to incorporate them in the LLNODE's CDNodeDeleteSubclassmethod. My questions are,a) Why is this so? Could anyone explain to me what are the major differencesbetween both methods?b) Which one of them will also be executed if a delete the node from LAPI?Thanks a lot, CurroThis email message is intended only for the use of the named recipient.Information contained in this email message and its attachments may beprivileged, confidential and protected from disclosure. If you are not theintended recipient, please do not read, copy, use or disclose thiscommunication to others. Also please notify the sender by replying to thismessage and then delete it from your system.

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Hans_Stoop_(hstoop_(Delete)_1579932)

Message from Hans Stoop <<A HREF="mailto:hstoop@opentext.com">hstoop@opentext.com> via eLink

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Hi Curro,

The safest way is to implement it in CBNodeDeleteSubclass. This function will always be called.

The way it works is:

If a node is deleted via the UI the llNode.NodeDelete is called.

That function calls all the other llNode.NodeDelete* funcions.

Somewhere in the middle it calls DAPI.DeleteNode

DAPI.DeleteNode removes the node from the database, but it also removes all the child objects from the database. The only way that DAPI is able to execute any oScript code is by calling the callback functions.

Hopes this helps.

hans

PS. The callbacks are set with Dapi.SetCallback

-----Original Message-----
From: eLink Discussion: Development Discussion [mailto:development@elinkkc.opentext.com]
Sent: donderdag 22 januari 2004 12:28
To: eLink Recipient
Subject: Node Callbacks

Node Callbacks Posted by IAEA_001User3 (Alcala-Soler, Francisco J) on 01/22/2004 06:27 AM

Message from <F.Alcala-Soler@iaea.org> via eLink

Hi,

I have some questions about callbacks. I have a custom node on which
I'd like to perform some adhoc database actions whenever it gets deleted. I
have implemented such database actions in the LLNODE's NodeDeleteSubclassPre
method and they work well whenever I delete an instance of the node.

However, when the node is deleted because its parent folder has been
deleted, the database actions in the above method do not get executed. I
have seen that the only way (that I know of) to have those actions performed
in all cases is to incorporate them in the LLNODE's CDNodeDeleteSubclass
method.

My questions are,
a) Why is this so? Could anyone explain to me what are the major differences
between both methods?
b) Which one of them will also be executed if a delete the node from LAPI?

Thanks a lot,

Curro

This email message is intended only for the use of the named recipient.
Information contained in this email message and its attachments may be
privileged, confidential and protected from disclosure. If you are not the
intended recipient, please do not read, copy, use or disclose this
communication to others. Also please notify the sender by replying to this
message and then delete it from your system.

Francisco_Alcala-Soler_(iaea_001user3_-_(deleted))

Thanks, Hans.I didn't know that llNode.NodeDelete was only called for the first object and that all child objects would be deleted through direct DAPI calls. That explains why my method was not working when the parent was deleted from the UI. I will switch to the CB methods immediately.Regarding DAPI.SetCallback, when would I need to use it? For now I have orphaned my custom node from the CompoundDoc LLNODE in the LLIAPI Ospace and all the CB methods (copy, delete, move) show up nicely, so I only need to override them and add my functionality. What would I need DAPI.SetCallback for?Thanks again, Curro

Hans_Stoop_(hstoop_(Delete)_1579932)

Message from Hans Stoop <<A HREF="mailto:hstoop@opentext.com">hstoop@opentext.com> via eLink

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">eLink

Hi Curro,

You should not have the need to use DAPI.SetCallback. Internal in livelink there is a callback for delete registered. That callback function will call the llNode.CBDelete functions.

Similar issues also exist for copy.

The delete process is a litle bit more complex since the introduction of the Undelete functionality.

Hans

-----Original Message-----
From: eLink Discussion: Development Discussion [mailto:development@elinkkc.opentext.com]
Sent: donderdag 22 januari 2004 15:07
To: eLink Recipient
Subject: RE 2 Node Callbacks

RE 2 Node Callbacks Posted by IAEA_001User3 (Alcala-Soler, Francisco J) on 01/22/2004 09:03 AM
In reply to: RE Node Callbacks Posted by hstoop (Stoop, Hans) on 01/22/2004 06:53 AM

Thanks, Hans.

I didn't know that llNode.NodeDelete was only called for the first object and that all child objects would be deleted through direct DAPI calls. That explains why my method was not working when the parent was deleted from the UI. I will switch to the CB methods immediately.

Regarding DAPI.SetCallback, when would I need to use it? For now I have orphaned my custom node from the CompoundDoc LLNODE in the LLIAPI Ospace and all the CB methods (copy, delete, move) show up nicely, so I only need to override them and add my functionality. What would I need DAPI.SetCallback for?

Thanks again,

Curro