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提交 5fe29cdb authored 作者: 杨雪's avatar 杨雪
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雪花算法、多线程雪花算法、改变ID中序列号位数的实现

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.idea/inspectionProfiles/Project_Default.xml 0 → 100644
浏览文件 @ 5fe29cdb
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.idea/misc.xml 0 → 100644
浏览文件 @ 5fe29cdb
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\ No newline at end of file
.idea/modules.xml 0 → 100644
浏览文件 @ 5fe29cdb
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.idea/uiDesigner.xml 0 → 100644
浏览文件 @ 5fe29cdb
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.idea/vcs.xml 0 → 100644
浏览文件 @ 5fe29cdb
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.idea/workspace.xml 0 → 100644
浏览文件 @ 5fe29cdb
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<window_info anchor="right" id="Maven" order="3" />
<window_info anchor="right" id="Palette" order="4" />
<window_info anchor="right" id="Word Book" order="5" side_tool="true" />
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<SUITE FILE_PATH="coverage/Reflect$timeStamp.ic" NAME="timeStamp Coverage Results" MODIFIED="1590368769888" SOURCE_PROVIDER="com.intellij.coverage.DefaultCoverageFileProvider" RUNNER="idea" COVERAGE_BY_TEST_ENABLED="false" COVERAGE_TRACING_ENABLED="false" />
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<provider selected="true" editor-type-id="text-editor">
<state relative-caret-position="441">
<caret line="63" column="9" lean-forward="true" selection-start-line="63" selection-start-column="9" selection-end-line="63" selection-end-column="9" />
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</state>
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<entry file="file://$PROJECT_DIR$/notes.iml">
<provider selected="true" editor-type-id="text-editor" />
</entry>
<entry file="file://$PROJECT_DIR$/note.md">
<provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
<state split_layout="SPLIT">
<first_editor />
<second_editor />
</state>
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<component name="masterDetails">
<states>
<state key="ArtifactsStructureConfigurable.UI">
<settings>
<artifact-editor />
<splitter-proportions>
<option name="proportions">
<list>
<option value="0.2" />
</list>
</option>
</splitter-proportions>
</settings>
</state>
<state key="FacetStructureConfigurable.UI">
<settings>
<splitter-proportions>
<option name="proportions">
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<option value="0.2" />
</list>
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<settings>
<splitter-proportions>
<option name="proportions">
<list>
<option value="0.2" />
</list>
</option>
</splitter-proportions>
</settings>
</state>
<state key="JdkListConfigurable.UI">
<settings>
<splitter-proportions>
<option name="proportions">
<list>
<option value="0.2" />
</list>
</option>
</splitter-proportions>
</settings>
</state>
<state key="ModuleStructureConfigurable.UI">
<settings>
<last-edited>Reflect</last-edited>
<splitter-proportions>
<option name="proportions">
<list>
<option value="0.2" />
<option value="0.6" />
</list>
</option>
</splitter-proportions>
</settings>
</state>
<state key="ProjectJDKs.UI">
<settings>
<last-edited>1.8</last-edited>
<splitter-proportions>
<option name="proportions">
<list>
<option value="0.2" />
</list>
</option>
</splitter-proportions>
</settings>
</state>
<state key="ProjectLibrariesConfigurable.UI">
<settings>
<splitter-proportions>
<option name="proportions">
<list>
<option value="0.2" />
</list>
</option>
</splitter-proportions>
</settings>
</state>
</states>
</component>
</project>
\ No newline at end of file
note.md 0 → 100644
浏览文件 @ 5fe29cdb
单线程：
序号位数为12位时：31%
序号位数为13位时：31%
序号位数为14位时：31%
序号位数为15位时：85%
序号位数为16位时：98%
```chart
n12,31
n13,31
n14,31
n15,85
n16,98
type: line
title: 单线程：CPU与序列号位数之间的关系
x.title: 序列号位数
y.title: CPU使用率
y.suffix: %
```
* * *
多线程：
5个线程：
序号位数为12位时：75%
序号位数为16位时：98%
4个线程
序号位数为12位时：78%
序号位数为16位时：95%
3个线程
序号位数为12位时：74%
序号位数为16位时：95%
2个线程
序号位数为12位时：67%
序号位数为16位时：88%
```chart
,Two,Three,Four,Five
n12,67,74,78,75
n16,88,95,95,98
type: line
title: 多线程：CPU与序列号位数之间的关系
x.title: 序列号位数
y.title: CPU使用率
y.suffix: %
```
* * *
```chart
,十万,百万,千万
n12,3329,3720,3932
n13,5700,7253,7779
n14,7542,14311,14721
n15,7685,25183,28459,
n16,9347,47022,51143
type: line
title: QPS与序列号位数、生成ID个数之间的关系
x.title: 序列号位数
y.title: QPS
y.suffix: *1000
X.suffix: 位
```
```chart
,百万,千万
t2,3633,3897
t3,3800,3862
t4,3600,3936
t5,3634,3945
type: line
title: QPS与线程数、生成id个数之间的关系
x.title: 线程数
y.title: QPS
y.suffix: *1000
```
notes.iml 0 → 100644
浏览文件 @ 5fe29cdb
<?xml version="1.0" encoding="UTF-8"?>
<module type="JAVA_MODULE" version="4">
<component name="NewModuleRootManager" inherit-compiler-output="true">
<exclude-output />
<content url="file://$MODULE_DIR$">
<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
</content>
<orderEntry type="inheritedJdk" />
<orderEntry type="sourceFolder" forTests="false" />
</component>
</module>
\ No newline at end of file
src/increasethenumber/IncreaseTheNumberOfID.java 0 → 100644
浏览文件 @ 5fe29cdb
package increasethenumber;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* @author 杨雪
*/
public class IncreaseTheNumberOfID {
/**
* 当前时间戳
*/
private static final long START_TIMESTAMP = 1590368867576L;
/**
*机器编码在ID中占得位数
*/
private static final long WORK_ID = 0L;
private long serialNumber = 0L;
private long lastTimestamp = 0L;
public long newId(){
long currentTimestamp = System.currentTimeMillis();
if (currentTimestamp < lastTimestamp){
throw new RuntimeException("时钟回拨");
}
if (currentTimestamp == lastTimestamp){
if (serialNumber < 32767L){
serialNumber += 1;
}
if (serialNumber == 32767L){
serialNumber = 0L;
}
if (serialNumber == 0L){
while (lastTimestamp >= currentTimestamp){
currentTimestamp = System.currentTimeMillis();
}
lastTimestamp = currentTimestamp;
}
}else {
currentTimestamp = System.currentTimeMillis();
serialNumber = 0L;
lastTimestamp = currentTimestamp;
}
return ((currentTimestamp-START_TIMESTAMP) << 22L)
|(WORK_ID << 15L)
|serialNumber ;
}
public static void main(String[] args) {
IncreaseTheNumberOfID increaseTheNumberOfID = new IncreaseTheNumberOfID();
List<Long> idList = new ArrayList();
long start = System.currentTimeMillis();
for (int i = 0; i<1000_000; i++){
long id = increaseTheNumberOfID.newId();
}
long end = System.currentTimeMillis();
for (int i = 0; i<1000_000; i++){
idList.add(increaseTheNumberOfID.newId());
}
Set<Long> idSet = new HashSet<>(idList);
int num = 0;
long nowId;
/* for (int j=1; j<idList.size(); j++){
nowId = idList.get(j);
if (nowId > idList.get(j-1)){
num ++;
}
}
System.out.println("满足递增比较的次数："+num);
System.out.println(" ");*/
System.out.println("总共生成id数："+idList.size()
+" 花费时间为："+(end-start)+"ms"
+" qps="+1000_000/(end-start)*1000);
System.out.println(" ");
System.out.println("list的id数量："+idList.size()
+" set的id数量"+idSet.size());
}
}
src/multithread/MyRunnable.java 0 → 100644
浏览文件 @ 5fe29cdb
package multithread;
import multithread.SnowFake;
import java.util.concurrent.atomic.AtomicLong;
public class MyRunnable implements Runnable {
private static final long START_TIMESTAMP = 1590368867576L;
/**
*机器编码在ID中占得位数
*/
private static final long WORK_ID = 0L;
private long serialNumber = 0L;
private long lastTimestamp = 0L;
private String taskNum;
private SnowFake snowFake;
private AtomicLong atomicLong;
public MyRunnable(SnowFake snowFake) {
this.snowFake = snowFake;
}
public MyRunnable(SnowFake snowFake, AtomicLong atomicLong) {
this.snowFake = snowFake;
this.atomicLong = atomicLong;
}
public MyRunnable() {
}
@Override
public void run() {
for (int i=0; i<=1000_000_000/2; i++) {
snowFake.newId();
atomicLong.incrementAndGet();
}
}
}
src/multithread/SnowFake.java 0 → 100644
浏览文件 @ 5fe29cdb
package multithread;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* @author 杨雪
*/
public class SnowFake {
/**
* 开始时间截（这个可以自己使用已经流逝的时间，我用的是自己写代码时的实际时间)
*/
private static final long START_STAMP = 1590368867576L;
/**
* 数据中心在id中占的位数
*/
private static final long DATA_CENTER_ID = 5L;
/**
* 机器码在id中占的位数
*/
private static final long MACHINE_ID = 1L;
/**
* 序列号在id中占得位数
*/
private static final long SERIAL_NUMBER = 16L;
/**
* 序列号最大值4095
*/
private static final long MAX_SERIAL_NUMBER = -1L ^ -1L << SERIAL_NUMBER;
private long dataCenter = 0L;
private long machineId = 0L;
private long serialNumber = 0L;
/**
* 上次生成ID的时间截
*/
private long lastTimestamp = 0L;
/**
* 数据标识id向左移17位(12+5)
*/
private final long datacenterIdLeft = SERIAL_NUMBER + MACHINE_ID;
/**
* 时间截向左移22位(5+5+12)
*/
private final long timestampLeftShift = SERIAL_NUMBER + MACHINE_ID + DATA_CENTER_ID;
public long getCurrentTimestamp() {
return System.currentTimeMillis();
}
public synchronized long newId() {
long currentTimestamp = getCurrentTimestamp();
if (currentTimestamp < lastTimestamp) {
throw new RuntimeException(
"出现时钟回拨异常");
}
if (currentTimestamp == lastTimestamp) {
serialNumber = (serialNumber + 1) & MAX_SERIAL_NUMBER;
if (serialNumber == 0L) {
while (lastTimestamp >= currentTimestamp) {
currentTimestamp = getCurrentTimestamp();
}
}
} else {
currentTimestamp = getCurrentTimestamp();
serialNumber = 0L;
}
lastTimestamp = currentTimestamp;
long l = ((currentTimestamp - START_STAMP) << timestampLeftShift)
| dataCenter << datacenterIdLeft
| (machineId << SERIAL_NUMBER)
| serialNumber;
return l;
}
}
src/multithread/TestThreadPool.java 0 → 100644
浏览文件 @ 5fe29cdb
package multithread;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicLong;
public class TestThreadPool {
public static void main(String[] args) {
AtomicLong atomicLong = new AtomicLong(0);
int taskSize = 2;
// 创建一个线程池
ExecutorService pool = Executors.newFixedThreadPool(taskSize);
long start = System.currentTimeMillis();
SnowFake snowFake = new SnowFake();
for (int i =0; i <taskSize; i++){
pool.submit(new MyRunnable(snowFake, atomicLong));
}
while (atomicLong.get()!= 1000_000_000){
}
long end = System.currentTimeMillis();
System.out.println("qps:"+1000_000_000/(end-start)*1000);
}
}
src/simplesnowfake/SnowFake.java 0 → 100644
浏览文件 @ 5fe29cdb
package simplesnowfake;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* @author 杨雪
*/
public class SnowFake {
/**
* 开始时间截（这个可以自己使用已经流逝的时间，我用的是自己写代码时的实际时间)
*/
private static final long START_STAMP = 1590368867576L;
/**
* 数据中心在id中占的位数
*/
private static final long DATA_CENTER_ID = 5L ;
/**
* 机器码在id中占的位数
*/
private static final long MACHINE_ID = 1L;
/**
* 序列号在id中占得位数
*/
private static final long SERIAL_NUMBER = 16L;
/**
* 序列号最大值4095
*/
private static final long MAX_SERIAL_NUMBER = -1L ^ -1L << SERIAL_NUMBER;
private long dataCenter =0L;
private long machineId = 0L;
private long serialNumber = 0L;
/**
* 上次生成ID的时间截
*/
private long lastTimestamp = 0L;
/**
* 数据标识id向左移17位(12+5)
*/
private final long datacenterIdLeft = SERIAL_NUMBER + MACHINE_ID;
/**
* 时间截向左移22位(5+5+12)
*/
private final long timestampLeftShift = SERIAL_NUMBER + MACHINE_ID + DATA_CENTER_ID;
public long getCurrentTimestamp(){
return System.currentTimeMillis();
}
public synchronized long newId(){
long currentTimestamp = getCurrentTimestamp();
if (currentTimestamp < lastTimestamp){
throw new RuntimeException(
"出现时钟回拨异常");
}
if (currentTimestamp == lastTimestamp){
serialNumber =(serialNumber+1) & MAX_SERIAL_NUMBER;
if (serialNumber == 0L){
while(lastTimestamp >= currentTimestamp){
currentTimestamp = getCurrentTimestamp();
}
}
}else {
currentTimestamp = getCurrentTimestamp();
serialNumber = 0L;
}
lastTimestamp = currentTimestamp;
long l = ((currentTimestamp - START_STAMP) << timestampLeftShift)
| dataCenter << datacenterIdLeft
| (machineId << SERIAL_NUMBER)
| serialNumber;
return l;
}
public static void main(String[] args) {
SnowFake sf = new SnowFake();
List<Long> list = new ArrayList();
int i = 0;
long start = System.currentTimeMillis();
while (i <= 10_0000) {
i++;
long id = sf.newId();
}
long end = System.currentTimeMillis();
Set<Long> ids = new HashSet<>(list);
int num=1;
long nowId;
for (int i1=1;i1<list.size();i1++){
nowId = list.get(i1);
if(nowId>list.get(i1-1)){
num++;
}
}
System.out.println("满足递增比较的次数："+num);
System.out.println("qps="+100000/(end-start)*1000);
System.out.println("总共生成"+ids.size()+"个ID，花费时间为"+(end - start)+"毫秒");
System.out.println(list.size());
System.out.println(ids.size());
}
}
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