On Tue, 25 Oct 2022 19:37:06 GMT, Ioi Lam <ik...@openjdk.org> wrote:
> Is it possible to use filter/findfirst without using lambdas? I want to avoid
> recursion inside the tracing code.
You could do this I believe (if I've eye-balled that correctly :)):
Suggestion:
String callerName = caller.getName();
String callerInfo = StackWalker.getInstance().walk(new
Function<Stream<StackWalker.StackFrame>, String>() {
// We use inner classes (instead of stream/lambda) to avoid
triggering
// further invokedynamic resolution, which would cause infinite
recursion.
// It's OK to use + for string concat, because java.base is
compiled without
// the use of indy string concat.
@Override
public String apply(Stream<StackWalker.StackFrame> s) {
return s.filter(new Predicate<StackWalker.StackFrame>() {
@Override
public boolean test(StackWalker.StackFrame f) {
return callerName.equals(f.getClassName());
}
}).findFirst().get().toStackTraceElement().toString();
}
});
> I am not sure about dumping the call stack. It seems an overkill and not
> useful in most cases. It’s easier to rebuild the JDK and add
> Thread.dumpStack() in the rare occasion that you need to do this.
Fair enough.
-------------
PR: https://git.openjdk.org/jdk/pull/10842
