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/*
* 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;
}
}
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