| /** |
| * Copyright 2011, Big Switch Networks, Inc. |
| * Originally created by David Erickson, Stanford University |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may |
| * not use this file except in compliance with the License. You may obtain |
| * a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations |
| * under the License. |
| **/ |
| |
| package net.floodlightcontroller.core.util; |
| |
| /*** |
| * FIXME Need a system for registering/binding applications to a unique ID |
| * |
| * @author capveg |
| * |
| */ |
| |
| public class AppCookie { |
| static final int APP_ID_BITS = 12; |
| static final int APP_ID_SHIFT = (64 - APP_ID_BITS); |
| // we have bits 13-31 unused here ... that's ok! |
| static final int USER_BITS = 32; |
| static final int USER_SHIFT = 0; |
| |
| |
| /** |
| * Encapsulate an application ID and a user block of stuff into a cookie |
| * |
| * @param application An ID to identify the application |
| * @param user Some application specific data |
| * @return a cookie for use in OFFlowMod.setCookie() |
| */ |
| |
| static public long makeCookie(int application, int user) { |
| return ((application & ((1L << APP_ID_BITS) - 1)) << APP_ID_SHIFT) | user; |
| } |
| |
| static public int extractApp(long cookie) { |
| return (int)((cookie>> APP_ID_SHIFT) & ((1L << APP_ID_BITS) - 1)); |
| } |
| |
| static public int extractUser(long cookie) { |
| return (int)((cookie>> USER_SHIFT) & ((1L << USER_BITS) - 1)); |
| } |
| } |