private boolean step() {
if (next != NONE) return true;
while (next == NONE) {
if (buffer.isEmpty()) {
if (completed) {
return false;
} else if (sourceIter.hasNext()) {
Object iter = null;
if (multi) iter = xf.applyTo(RT.cons(null, sourceIter.next()));
else iter = xf.invoke(null, sourceIter.next());
if (RT.isReduced(iter)) {
xf.invoke(null);
completed = true;
}
} else {
xf.invoke(null);
completed = true;
}
} else {
next = buffer.remove();
}
}
return true;
}
Object doCommute(Ref ref, IFn fn, ISeq args) {
if (!info.running()) throw retryex;
if (!vals.containsKey(ref)) {
Object val = null;
try {
ref.lock.readLock().lock();
val = ref.tvals == null ? null : ref.tvals.val;
} finally {
ref.lock.readLock().unlock();
}
vals.put(ref, val);
}
ArrayList<CFn> fns = commutes.get(ref);
if (fns == null) commutes.put(ref, fns = new ArrayList<CFn>());
fns.add(new CFn(fn, args));
Object ret = fn.applyTo(RT.cons(vals.get(ref), args));
vals.put(ref, ret);
return ret;
}