| /* |
| * Copyright 2016-present Open Networking Foundation |
| * |
| * 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.net.link; |
| |
| import com.google.common.hash.HashFunction; |
| import com.google.common.hash.HashCode; |
| import com.google.common.hash.Hashing; |
| |
| import org.onosproject.cluster.ClusterMetadata; |
| |
| /** |
| * Abstraction for an entity that provides information about infrastructure |
| * links that are discovered or verified using probe messages. |
| */ |
| public interface ProbedLinkProvider extends LinkProvider { |
| |
| static final String DEFAULT_MAC = "DE:AD:BE:EF:BA:11"; |
| |
| static String defaultMac() { |
| return DEFAULT_MAC; |
| } |
| |
| /** |
| * Build a stringified MAC address using the ClusterMetadata hash for uniqueness. |
| * Form of MAC is "02:eb" followed by four bytes of clusterMetadata hash. |
| * |
| * @param cm cluster metadata |
| * @return stringified mac address |
| */ |
| static String fingerprintMac(ClusterMetadata cm) { |
| if (cm == null) { |
| return DEFAULT_MAC; |
| } |
| |
| HashFunction hf = Hashing.murmur3_32(); |
| HashCode hc = hf.newHasher().putObject(cm, ClusterMetadata.HASH_FUNNEL).hash(); |
| int unqf = hc.asInt(); |
| |
| StringBuilder sb = new StringBuilder(); |
| sb.append("02:eb"); |
| for (int i = 0; i < 4; i++) { |
| byte b = (byte) (unqf >> i * 8); |
| sb.append(String.format(":%02X", b)); |
| } |
| return sb.toString(); |
| } |
| } |