Michael Heuer wrote:
Might you also be able to use an unmutable MultiKey for storage in the
hashed map and a mutable MultiKey for lookups, with matching equals and
hashCode implementations?
void put(Obj a, Obj b, ...) {
map.put(new MultiKey(a, b, ..));
}
private MutableMultiKey lookupKey = new MutableMultiKey();
Object get(Obj a, Obj b, ...) {
lookupKey.setKeys(a, b, ..));
return map.get(lookupKey);
}
I have something that works this way lying around somewhere.
I'm not 100% sure, but I don't think this is thread safe, since multiple
threads may be calling the get method at the same time and thus
modifying the lookupKey instance var.
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