Guys, thank you all for input.
I found that both keywords were (as you expected) loaded by same
classloader (same parent was used in both). After fixing that the assert
indeed fails.
Cheers!
On Thursday, 13 February 2014 00:41:12 UTC+1, Alex Miller wrote:
Reading a little more closely,
Hi,
I wonder how is equality of keywords implemented in Clojure?
I have this piece of Java code executed in one classloader:
Keyword a = (Keyword) RT.var(clojure.core, keyword).invoke(keyword);
Then, when I pass it to another part of my application (which uses another
classloader) and do this:
Interning table uses keyword's symbol as a key, and the symbols are
compared by value. See
https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/Keyword.java#L37
On Wed, Feb 12, 2014 at 5:23 PM, Arkadiusz Komarzewski
akomarzew...@gmail.com wrote:
Hi,
I wonder how is equality
I'm willing to bet that both classloaders have the same clojure runtime in
a common base classloader.
i.e. that cl1.loadClass(clojure.lang.RT) ==
cl2.loadClass(clojure.lang.RT);
If the two clojure runtimes were distinct, the assert would indeed fail.
Also .equals return false and this assignment
I think it's a little more subtle than that. Symbols are composed of a
String name and a String namespace. When symbols are created they intern
each of those Strings. Interned Strings are comparable by identity across
the JVM. Symbol equals() compares name and namespace. Keyword extends from
Reading a little more closely, that's an identity comparison in Java, not
an equals comparison in Clojure (who uses Java anyways? :). So I would
retract my last statement. The question is really whether the two
classloaders are deferring the load of the common class to a parent
classloader
