public V get(K key) {
V v = cache.getIfPresent(key);
if (v == null) {
try {
lockManager.hold(locks, key);
if (v == null) {
v = loader.load(key);
cache.put(key, v);
}
} catch (Exception ex) {
PGException.pgThrow(ex);
} finally {
lockManager.release(locks, key);
}
}
return v;
}
