How to have a different conditional check for a null object and locked object?

Question

Question

Keerthi Mettu · Jul 21, 2023

I have a list type data object, that has both null entries and locked entries. While iterating through the list items using GetAt() function, a locked item is satisfying the not null condition. But I need a different conditional statement for null items and locked items.

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score 0 · Answer 1 · 2023-07-21T20:25:11-04:00

Do you have a code snippet for us? Something like

write mylist.%IsA("%ListOfDataTypes") --> 1
set item = mylist.%GetAt(2)
//
// Now the big question: what do you (want to) do with this item?
//
// do you try to lock a global: lock ^myGlobal(item) ?
// do you try to open (a possible locked) Object: set obj=##class(some.class).%OpenId(item [,4]) ?
// something else?

score 0 · Answer 2 · 2023-07-22T04:01:13-04:00

Robert Cemper · Jul 22, 2023

How do you recognize LOCKED items ?
How do you LOCK items ?

0 0

score 0 · Answer 3 · 2023-07-22T04:55:45-04:00

Well, you already have a null check.

To check if the object is locked just try to acquire exclusive lock with no wait, so it's enough to call %AcquireLock.