/**
* 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));
}
}