How can I detect whether an object still exists in another region?

[Life Camino]

If I know the key of the object, how can I determine whether it still exists without having to visit the region?

[Cerise Sorbet]

There's no central database for rezzed objects. You'll either need some other object in the region to keep tabs on it, or get the object itself to respond to phone home messages, like with llEmail or to ping a web site etc.

[Sassy Romano]

Just to add that you can have the object respond to incoming http requests if you know the URL of the object.  The killer to this plan is that unlike the key of a rezzed object, if a region restarts, objects obtain a new URL so you end up having to track the URL change in a database anyway.

There's a JIRA open asking for the URL to remain constant but as with many useful things in LL, that one sits dormant.

[Qie Niangao]

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There's a JIRA open asking for the URL to remain constant but as with many useful things in LL, that one sits dormant.

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Fortunately, that becomes less important when Experience Tools are made available because they provide a grid-wide Key Value Pair "persistent store" that can hold those ephemeral URLs, similar to the old kludge-around using external servers as registries.

Lately they've been saying "soon" for general availability.

(Also, for some applications that used to rely on HTTP, merely polling the Experience persistent store may be adequate communications, and even preferable for some uses. Not so much the one in this thread, though.)

[Sassy Romano]

Thanks Qie, that's helpful to know.