Node ceilingNode(double key) {
for (; ; ) {
Node b = skipListMap.findGrandPredecessor(key, refCntCallback);
if (b == null) b = head;
if (b != head && key <= b.last()) {
return b;
}
assert b == head || b.last() < key;
Node n = safeNext(b);
release(b);
if (n == null) {
return null;
} else if (key <= n.last()) {
return n;
}
Node f = safeNext(n);
release(n);
if (f == null) {
return null;
} else {
if (isInconsistentNextNode(f, key)) {
release(f);
continue;
}
return f;
}
}
}
V putAtomic(double key, V value, boolean onlyIfAbsent) {
if (value == null) throw new NullPointerException();
for (; ; ) {
Node b = skipListMap.findGrandPredecessor(key, refCntCallback);
if (b == null) b = head;
if (b != head && b.first() <= key && key <= b.last()) {
release(b);
continue;
}
assert b == head || b.last() < key;
Node n = safeNext(b);
if (n == null) {
if (b.appendNewAtomic(key, value, this)) {
release(b);
return null;
} else {
release(b);
continue;
}
} else if (n.first() <= key && key <= n.last()) {
Object val = n.putAtomic(key, value, b, onlyIfAbsent, this);
release(b, n);
if (val == Retry) continue;
return (V) val;
}
Node f = safeNext(n);
if (f == null) {
Object val = n.putAtomic(key, value, b, onlyIfAbsent, this);
release(b, n);
if (val == Retry) continue;
return (V) val;
} else {
if (f.first() == key) {
Object val = f.putAtomic(key, value, n, onlyIfAbsent, this);
release(b, n, f);
if (val == Retry) continue;
return (V) val;
} else {
if (key > f.first()) { // inconsistent read, retry
release(b, n, f);
continue;
}
Object val = n.putAtomic(key, value, b, onlyIfAbsent, this);
release(b, n, f);
if (val == Retry) continue;
return (V) val;
}
}
}
}
int findEndIndex(Node n, double key, boolean inclusive) {
boolean exclusive = !inclusive;
if (key < n.first()) return -1;
if (key >= n.last()) {
if (key == n.last() && exclusive) return n.len() - 2;
return n.len() - 1;
}
int pos = n.findKeyIndex(key);
if (pos < 0) pos = -(pos + 1);
else if (!inclusive) pos--;
if (pos == n.len()) pos--;
return pos;
}
V doReplace(double key, V old, V value) {
for (; ; ) {
Node b = skipListMap.findGrandPredecessor(key, refCntCallback);
if (b == null) b = head;
if (b != head && b.first() <= key && key <= b.last()) {
// can happen if there's inconsistency between skipListMap and orderedMap(this).
// The inconsistency can happen from Node.putAtomicReally(),
// where it adds to, and removes from skiplistMap.
Object val = b.replace(key, old, value);
release(b);
if (val == Retry) continue;
return (V) val;
}
assert b == head || b.last() < key;
Node n = safeNext(b);
release(b);
if (n == null) {
return null;
} else if (n.first() <= key && key <= n.last()) {
Object val = n.replace(key, old, value);
release(n);
if (val == Retry) continue;
return (V) val;
}
Node f = safeNext(n);
release(n);
if (f == null) {
return null;
} else {
if (isInconsistentNextNode(f, key)) {
release(f);
continue;
}
Object val = f.replace(key, old, value);
release(f);
if (val == Retry) continue;
return (V) val;
}
}
}