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Indexes: Indexing Compare Exchange Values
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Compare exchange values can be loaded within an index using the value's key.
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The index will update when the compare exchange value is updated, as well as when documents are modified in the indexed collection(s).
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In this page:
How to use
When creating an index using AbstractIndexCreationTask, use javaScript
to load a compare exchange value by its key.
Examples
These indexes map the rooms in a hotel, as well as compare exchange values representing the guests in those rooms.
private class Compare_Exchange_JS_Index extends AbstractJavaScriptIndexCreationTask{
public Compare_Exchange_JS_Index()
{
setMaps(Collections.singleton(
"map('HotelRooms', function (room) {\n"+
" var guests = cmpxchg(room.RoomID);\n"+
" return {\n"+
" RoomID: room.RoomID,\n"+
" Guests: guests\n"+
" }\n"+
"});"
)
);
};
}
Querying the Index
IRawDocumentQuery<Hotelroom> VIPRooms = session.advanced().rawQuery(Hotelroom.class,
"from Hotelrooms as room\n" +
"where room.Guests == cmpxchg('VIP')");
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