Hello,
When I read the source code keyword, say, Keyword.java (V1.3), I found that
when we "intern" a keyword, (if I understand it correctly) it uses a
cache for keywords:
=============================================
public static Keyword intern(Symbol sym) {
if (sym.meta() != null)
sym = (Symbol) sym.withMeta(null);
*Util.clearCache(rq, table);*
Keyword k = new Keyword(sym);
Reference<Keyword> existingRef = table.putIfAbsent(sym,
new WeakReference<Keyword>(k, rq));
if (existingRef == null)
return k;
Keyword existingk = existingRef.get();
if (existingk != null)
return existingk;
// entry died in the interim, do over
table.remove(sym, existingRef);
return intern(sym);
}
==============================================
well, I just don't understand why we need caching for keywords. Anyone
could give me a hint?
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