public static Node loadNode(Storage storage, long offset) {
storage.seek(offset);
Node node = new Node(storage);
byte[] b = new byte[Node.NODE_BYTES_LEN];
int len = storage.read(b);
if (len < Node.NODE_BYTES_LEN) {
storage.seek(storage.getPointer() - len); // if load node fail,reset the offset
throw new RuntimeException(
"storage load data starts at : " + offset + ",but couldn't read success");
}
node.fill(b);
return node;
}
public static Node allocateNewNode(Storage storage) {
Node node = new Node(storage);
node.clear();
node.setStoragePointer(storage.length());
storage.seek(storage.length());
storage.write(node.toBytes());
return node;
}
public static void flushToStorage(Node item, Storage storage) {
if (item == null) return;
storage.seek(item.getStoragePointer());
storage.write(item.toBytes());
}