/*
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* Copyright 1999-2019 Seata.io Group.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package io.seata.server;
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import io.seata.common.util.IdWorker;
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/**
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* The type Uuid generator.
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*
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* @author sharajava
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*/
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public class UUIDGenerator {
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private static volatile IdWorker idWorker;
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/**
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* generate UUID using snowflake algorithm
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* @return UUID
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*/
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public static long generateUUID() {
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if (idWorker == null) {
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synchronized (UUIDGenerator.class) {
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if (idWorker == null) {
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init(null);
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}
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}
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}
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return idWorker.nextId();
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}
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/**
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* init IdWorker
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* @param serverNode the server node id, consider as machine id in snowflake
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*/
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public static void init(Long serverNode) {
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idWorker = new IdWorker(serverNode);
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}
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}
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