| /* |
| * 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.solr.util; |
| |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.lucene.util.StringHelper; |
| import org.apache.solr.common.util.TimeSource; |
| |
| /** |
| * Helper class for generating unique ID-s. |
| */ |
| public class IdUtils { |
| |
| /** |
| * Generate a short random id (see {@link StringHelper#randomId()}). |
| */ |
| public static final String randomId() { |
| return StringHelper.idToString(StringHelper.randomId()); |
| } |
| |
| /** |
| * Generate a random id with a timestamp, in the format: |
| * <code>hex(timestamp) + 'T' + randomId</code>. This method |
| * uses {@link TimeSource#CURRENT_TIME} for timestamp values. |
| */ |
| public static final String timeRandomId() { |
| return timeRandomId(TimeUnit.MILLISECONDS.convert(TimeSource.CURRENT_TIME.getTimeNs(), TimeUnit.NANOSECONDS)); |
| } |
| |
| /** |
| * Generate a random id with a timestamp, in the format: |
| * <code>hex(timestamp) + 'T' + randomId</code>. |
| * @param time value representing timestamp |
| */ |
| public static final String timeRandomId(long time) { |
| StringBuilder sb = new StringBuilder(Long.toHexString(time)); |
| sb.append('T'); |
| sb.append(randomId()); |
| return sb.toString(); |
| } |
| } |