| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.ambari.metrics.core.timeline.uuid; |
| |
| import com.google.common.hash.Hashing; |
| import org.apache.ambari.metrics.core.timeline.aggregators.TimelineClusterMetric; |
| import org.apache.commons.lang.StringUtils; |
| |
| public class Murmur3HashUuidGenStrategy implements MetricUuidGenStrategy{ |
| |
| /** |
| * Compute Murmur3Hash 16 byte UUID for a Metric-App-Instance. |
| * @param timelineClusterMetric input metric |
| * @param maxLength Max length of returned UUID. (Will always be 16 for this technique) |
| * @return 16 byte UUID. |
| */ @Override |
| public byte[] computeUuid(TimelineClusterMetric timelineClusterMetric, int maxLength) { |
| |
| String metricString = timelineClusterMetric.getMetricName() + timelineClusterMetric.getAppId(); |
| if (StringUtils.isNotEmpty(timelineClusterMetric.getInstanceId())) { |
| metricString += timelineClusterMetric.getInstanceId(); |
| } |
| byte[] metricBytes = metricString.getBytes(); |
| return Hashing.murmur3_128().hashBytes(metricBytes).asBytes(); |
| } |
| |
| /** |
| * Compute Murmur3Hash 4 byte UUID for a String. |
| * @param value String input |
| * @param maxLength Max length of returned UUID. (Will always be 4 for this technique) |
| * @return 4 byte UUID. |
| */ |
| @Override |
| public byte[] computeUuid(String value, int maxLength) { |
| byte[] valueBytes = value.getBytes(); |
| return Hashing.murmur3_32().hashBytes(valueBytes).asBytes(); |
| } |
| } |