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* rewrite code generate,fix bit shift * fix ut * add algorithm from licenses file * add algorithm from licenses file * add algorithm from licenses file * add algorithm from licenses file * add algorithm from licenses file * fix ut3.0.0/version-upgrade
JinYong Li
3 years ago
committed by
GitHub
17 changed files with 142 additions and 139 deletions
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/** Copyright 2010-2012 Twitter, Inc.*/ |
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package org.apache.dolphinscheduler.common.utils; |
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import java.net.InetAddress; |
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import java.net.UnknownHostException; |
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import java.util.Objects; |
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/** |
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* Rewriting based on Twitter snowflake algorithm |
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*/ |
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public class CodeGenerateUtils { |
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// start timestamp
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private static final long START_TIMESTAMP = 1609430400000L; //2021-01-01 00:00:00
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// Each machine generates 32 in the same millisecond
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private static final long LOW_DIGIT_BIT = 5L; |
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private static final long MIDDLE_BIT = 2L; |
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private static final long MAX_LOW_DIGIT = ~(-1L << LOW_DIGIT_BIT); |
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// The displacement to the left
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private static final long MIDDLE_LEFT = LOW_DIGIT_BIT; |
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private static final long HIGH_DIGIT_LEFT = LOW_DIGIT_BIT + MIDDLE_BIT; |
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private final long machineHash; |
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private long lowDigit = 0L; |
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private long recordMillisecond = -1L; |
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private static final long SYSTEM_TIMESTAMP = System.currentTimeMillis(); |
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private static final long SYSTEM_NANOTIME = System.nanoTime(); |
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private CodeGenerateUtils() throws CodeGenerateException { |
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try { |
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this.machineHash = Math.abs(Objects.hash(InetAddress.getLocalHost().getHostName())) % (2 << (MIDDLE_BIT - 1)); |
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} catch (UnknownHostException e) { |
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throw new CodeGenerateException(e.getMessage()); |
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} |
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} |
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private static CodeGenerateUtils instance = null; |
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public static synchronized CodeGenerateUtils getInstance() throws CodeGenerateException { |
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if (instance == null) { |
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instance = new CodeGenerateUtils(); |
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} |
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return instance; |
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} |
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public synchronized long genCode() throws CodeGenerateException { |
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long nowtMillisecond = systemMillisecond(); |
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if (nowtMillisecond < recordMillisecond) { |
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throw new CodeGenerateException("New code exception because time is set back."); |
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} |
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if (nowtMillisecond == recordMillisecond) { |
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lowDigit = (lowDigit + 1) & MAX_LOW_DIGIT; |
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if (lowDigit == 0L) { |
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while (nowtMillisecond <= recordMillisecond) { |
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nowtMillisecond = systemMillisecond(); |
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} |
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} |
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} else { |
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lowDigit = 0L; |
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} |
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recordMillisecond = nowtMillisecond; |
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return (nowtMillisecond - START_TIMESTAMP) << HIGH_DIGIT_LEFT | machineHash << MIDDLE_LEFT | lowDigit; |
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} |
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private long systemMillisecond() { |
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return SYSTEM_TIMESTAMP + (System.nanoTime() - SYSTEM_NANOTIME) / 1000000; |
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} |
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public static class CodeGenerateException extends Exception { |
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public CodeGenerateException(String message) { |
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super(message); |
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} |
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} |
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} |
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@ -1,94 +0,0 @@
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/* |
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* Licensed to the Apache Software Foundation (ASF) under one or more |
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* contributor license agreements. See the NOTICE file distributed with |
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* this work for additional information regarding copyright ownership. |
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* The ASF licenses this file to You under the Apache License, Version 2.0 |
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* (the "License"); you may not use this file except in compliance with |
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* the License. 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 org.apache.dolphinscheduler.common.utils; |
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import java.net.InetAddress; |
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import java.net.UnknownHostException; |
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import java.util.Objects; |
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public class SnowFlakeUtils { |
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// start timestamp
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private static final long START_TIMESTAMP = 1609430400000L; //2021-01-01 00:00:00
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// Each machine generates 32 in the same millisecond
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private static final long SEQUENCE_BIT = 5; |
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private static final long MACHINE_BIT = 2; |
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private static final long MAX_SEQUENCE = ~(-1L << SEQUENCE_BIT); |
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// The displacement to the left
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private static final long MACHINE_LEFT = SEQUENCE_BIT + MACHINE_BIT; |
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private static final long TIMESTAMP_LEFT = SEQUENCE_BIT + MACHINE_BIT + MACHINE_LEFT; |
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private final int machineId; |
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private long sequence = 0L; |
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private long lastTimestamp = -1L; |
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private static final long SYSTEM_TIMESTAMP = System.currentTimeMillis(); |
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private static final long SYSTEM_NANOTIME = System.nanoTime(); |
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private SnowFlakeUtils() throws SnowFlakeException { |
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try { |
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this.machineId = Math.abs(Objects.hash(InetAddress.getLocalHost().getHostName())) % 4; |
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} catch (UnknownHostException e) { |
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throw new SnowFlakeException(e.getMessage()); |
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} |
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} |
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private static SnowFlakeUtils instance = null; |
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public static synchronized SnowFlakeUtils getInstance() throws SnowFlakeException { |
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if (instance == null) { |
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instance = new SnowFlakeUtils(); |
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} |
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return instance; |
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} |
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public synchronized long nextId() throws SnowFlakeException { |
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long currStmp = nowTimestamp(); |
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if (currStmp < lastTimestamp) { |
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throw new SnowFlakeException("Clock moved backwards. Refusing to generate id"); |
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} |
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if (currStmp == lastTimestamp) { |
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sequence = (sequence + 1) & MAX_SEQUENCE; |
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if (sequence == 0L) { |
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currStmp = getNextMill(); |
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} |
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} else { |
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sequence = 0L; |
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} |
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lastTimestamp = currStmp; |
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return (currStmp - START_TIMESTAMP) << TIMESTAMP_LEFT |
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| machineId << MACHINE_LEFT |
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| sequence; |
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} |
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private long getNextMill() { |
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long mill = nowTimestamp(); |
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while (mill <= lastTimestamp) { |
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mill = nowTimestamp(); |
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} |
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return mill; |
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} |
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private long nowTimestamp() { |
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return SYSTEM_TIMESTAMP + (System.nanoTime() - SYSTEM_NANOTIME) / 1000000; |
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} |
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public static class SnowFlakeException extends Exception { |
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public SnowFlakeException(String message) { |
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super(message); |
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} |
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} |
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} |
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@ -0,0 +1,11 @@
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Copyright 2010-2012 Twitter, Inc. |
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Licensed under the Apache License, Version 2.0 (the "License"); you may not use this |
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file except in compliance with the License. You may obtain a copy of the License at |
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http://www.apache.org/licenses/LICENSE-2.0 |
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Unless required by applicable law or agreed to in writing, software distributed |
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under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR |
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CONDITIONS OF ANY KIND, either express or implied. See the License for the |
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specific language governing permissions and limitations under the License. |
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@ -0,0 +1,11 @@
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Copyright 2010-2012 Twitter, Inc. |
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Licensed under the Apache License, Version 2.0 (the "License"); you may not use this |
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file except in compliance with the License. You may obtain a copy of the License at |
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http://www.apache.org/licenses/LICENSE-2.0 |
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Unless required by applicable law or agreed to in writing, software distributed |
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under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR |
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CONDITIONS OF ANY KIND, either express or implied. See the License for the |
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specific language governing permissions and limitations under the License. |
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