com.alibaba.nacos.naming.pojo.instance.SnowFlakeInstanceIdGenerator Maven / Gradle / Ivy
/*
* Copyright 1999-2023 Alibaba Group Holding Ltd.
*
* 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 com.alibaba.nacos.naming.pojo.instance;
import com.alibaba.nacos.api.naming.pojo.Instance;
import com.alibaba.nacos.api.naming.spi.generator.InstanceIdGenerator;
import com.alibaba.nacos.core.distributed.id.SnowFlowerIdGenerator;
import static com.alibaba.nacos.api.common.Constants.NAMING_INSTANCE_ID_SPLITTER;
import static com.alibaba.nacos.api.common.Constants.SNOWFLAKE_INSTANCE_ID_GENERATOR;
/**
* SnowFlake InstanceId Generator..
*
* @author : huangtianhui
*/
public class SnowFlakeInstanceIdGenerator implements InstanceIdGenerator {
private static final SnowFlowerIdGenerator SNOW_FLOWER_ID_GENERATOR = new SnowFlowerIdGenerator();
private static volatile boolean initialize = false;
private static final Object LOCK = new Object();
/**
* initialize the workerId and ensure that it is only initialized once.
*/
private void ensureWorkerIdInitialization() {
if (!initialize) {
synchronized (LOCK) {
if (!initialize) {
SNOW_FLOWER_ID_GENERATOR.init();
initialize = true;
}
}
}
}
@Override
public String generateInstanceId(Instance instance) {
ensureWorkerIdInitialization();
return SNOW_FLOWER_ID_GENERATOR.nextId() + NAMING_INSTANCE_ID_SPLITTER
+ instance.getClusterName() + NAMING_INSTANCE_ID_SPLITTER
+ instance.getServiceName();
}
@Override
public String type() {
return SNOWFLAKE_INSTANCE_ID_GENERATOR;
}
}