| /* |
| * Copyright 2015 Open Networking Laboratory |
| * |
| * 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 org.onosproject.sfc.manager; |
| |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| /** |
| * Unique NSH SPI Id generator for NSH header. |
| */ |
| public final class NshSpiIdGenerators { |
| |
| private static final AtomicInteger NSH_SPI_ID_GEN = new AtomicInteger(); |
| private static final int MAX_NSH_SPI_ID = 0x7FFFFFFF; |
| private static int nshSpiId; |
| |
| /** |
| * Default constructor. |
| */ |
| private NshSpiIdGenerators() { |
| } |
| |
| /** |
| * Get the next NSH SPI id. |
| * |
| * @return NSH SPI id |
| */ |
| public static int create() { |
| do { |
| if (nshSpiId >= MAX_NSH_SPI_ID) { |
| if (NSH_SPI_ID_GEN.get() >= MAX_NSH_SPI_ID) { |
| NSH_SPI_ID_GEN.set(0); |
| } |
| } |
| nshSpiId = NSH_SPI_ID_GEN.incrementAndGet(); |
| } while (nshSpiId > MAX_NSH_SPI_ID); |
| return nshSpiId; |
| } |
| } |