diff options
Diffstat (limited to 'framework/src/onos/apps/vtn/sfcmgr/src/main/java/org/onosproject/sfc/manager/NshSpiIdGenerators.java')
-rw-r--r-- | framework/src/onos/apps/vtn/sfcmgr/src/main/java/org/onosproject/sfc/manager/NshSpiIdGenerators.java | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/framework/src/onos/apps/vtn/sfcmgr/src/main/java/org/onosproject/sfc/manager/NshSpiIdGenerators.java b/framework/src/onos/apps/vtn/sfcmgr/src/main/java/org/onosproject/sfc/manager/NshSpiIdGenerators.java new file mode 100644 index 00000000..1dbe8c8f --- /dev/null +++ b/framework/src/onos/apps/vtn/sfcmgr/src/main/java/org/onosproject/sfc/manager/NshSpiIdGenerators.java @@ -0,0 +1,51 @@ +/* + * 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; + } +} |