├── README.md
├── .gitignore
├── pom.xml
└── src
    └── main
        └── java
            └── tech
                └── insight
                    ├── Main.java
                    ├── Job.java
                    └── ScheduleService.java


/README.md:
--------------------------------------------------------------------------------
1 | ## 一个简单的定时任务实现
2 | 
3 | B站视频链接 ： [跳转B站](https://www.bilibili.com/video/BV19jffYVE3C/?vd_source=b13a31d63cf084a4bc7e9d71d9c78835#reply113889094272315)
4 | 


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
 1 | target/
 2 | !.mvn/wrapper/maven-wrapper.jar
 3 | !**/src/main/**/target/
 4 | !**/src/test/**/target/
 5 | 
 6 | ### IntelliJ IDEA ###
 7 | .idea/*
 8 | *.iws
 9 | *.iml
10 | *.ipr
11 | 
12 | ### Eclipse ###
13 | .apt_generated
14 | .classpath
15 | .factorypath
16 | .project
17 | .settings
18 | .springBeans
19 | .sts4-cache
20 | 
21 | ### NetBeans ###
22 | /nbproject/private/
23 | /nbbuild/
24 | /dist/
25 | /nbdist/
26 | /.nb-gradle/
27 | build/
28 | !**/src/main/**/build/
29 | !**/src/test/**/build/
30 | 
31 | ### VS Code ###
32 | .vscode/
33 | 
34 | ### Mac OS ###
35 | .DS_Store
36 | 


--------------------------------------------------------------------------------
/pom.xml:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <project xmlns="http://maven.apache.org/POM/4.0.0"
 3 |          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4 |          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 5 |     <modelVersion>4.0.0</modelVersion>
 6 | 
 7 |     <groupId>tech.insight</groupId>
 8 |     <artifactId>mini_schedule</artifactId>
 9 |     <version>1.0-SNAPSHOT</version>
10 | 
11 |     <properties>
12 |         <maven.compiler.source>17</maven.compiler.source>
13 |         <maven.compiler.target>17</maven.compiler.target>
14 |         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
15 |     </properties>
16 | 
17 | </project>
18 | 


--------------------------------------------------------------------------------
/src/main/java/tech/insight/Main.java:
--------------------------------------------------------------------------------
 1 | package tech.insight;
 2 | 
 3 | 
 4 | import java.time.LocalDateTime;
 5 | import java.time.format.DateTimeFormatter;
 6 | 
 7 | /**
 8 |  * @author gongxuanzhangmelt@gmail.com
 9 |  **/
10 | public class Main {
11 |     public static void main(String[] args) throws InterruptedException {
12 |         DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("HH:mm:ss SSS");
13 |         ScheduleService scheduleService = new ScheduleService();
14 |         scheduleService.schedule(()->{
15 |             System.out.println(LocalDateTime.now().format(dateTimeFormatter) +" 这是 100毫秒一次的");
16 |         },100);
17 |         
18 |         Thread.sleep(1000);
19 |         System.out.println("添加一个每200毫秒打印一个2的定时任务");
20 |         scheduleService.schedule(()->{
21 |             System.out.println(LocalDateTime.now().format(dateTimeFormatter) +" 这是 200毫秒一次的");
22 |         },200);
23 |     }
24 | }
25 | 


--------------------------------------------------------------------------------
/src/main/java/tech/insight/Job.java:
--------------------------------------------------------------------------------
 1 | package tech.insight;
 2 | 
 3 | /**
 4 |  * @author gongxuanzhangmelt@gmail.com
 5 |  **/
 6 | public class Job implements Comparable<Job> {
 7 | 
 8 |     private Runnable task;
 9 | 
10 |     private long startTime;
11 |     
12 |     private long delay;
13 | 
14 |     public long getDelay() {
15 |         return delay;
16 |     }
17 | 
18 |     public Job setDelay(long delay) {
19 |         this.delay = delay;
20 |         return this;
21 |     }
22 | 
23 |     public Runnable getTask() {
24 |         return task;
25 |     }
26 | 
27 |     public Job setTask(Runnable task) {
28 |         this.task = task;
29 |         return this;
30 |     }
31 | 
32 |     public long getStartTime() {
33 |         return startTime;
34 |     }
35 | 
36 |     public Job setStartTime(long startTime) {
37 |         this.startTime = startTime;
38 |         return this;
39 |     }
40 | 
41 |     @Override
42 |     public int compareTo(Job o) {
43 |         return Long.compare(this.startTime, o.startTime);
44 |     }
45 | }
46 | 


--------------------------------------------------------------------------------
/src/main/java/tech/insight/ScheduleService.java:
--------------------------------------------------------------------------------
 1 | package tech.insight;
 2 | 
 3 | 
 4 | import java.util.concurrent.ExecutorService;
 5 | import java.util.concurrent.Executors;
 6 | import java.util.concurrent.PriorityBlockingQueue;
 7 | import java.util.concurrent.locks.LockSupport;
 8 | 
 9 | /**
10 |  * @author gongxuanzhangmelt@gmail.com
11 |  **/
12 | public class ScheduleService {
13 | 
14 | 
15 |     Trigger trigger = new Trigger();
16 | 
17 |     ExecutorService executorService = Executors.newFixedThreadPool(6);
18 | 
19 |     void schedule(Runnable task, long delay) {
20 |         Job job = new Job();
21 |         job.setTask(task);
22 |         job.setStartTime(System.currentTimeMillis() + delay);
23 |         job.setDelay(delay);
24 |         trigger.queue.offer(job);
25 |         trigger.wakeUp();
26 |     }
27 | 
28 |     //  等待合适的时间，把对应的任务扔到线程池中
29 |     class Trigger {
30 | 
31 |         PriorityBlockingQueue<Job> queue = new PriorityBlockingQueue<>();
32 | 
33 |         Thread thread = new Thread(() -> {
34 |             while (true) {
35 |                 while (queue.isEmpty()) {
36 |                     LockSupport.park();
37 |                 }
38 |                 Job latelyJob = queue.peek();
39 |                 if (latelyJob.getStartTime() < System.currentTimeMillis()) {
40 |                     latelyJob = queue.poll();
41 |                     executorService.execute(latelyJob.getTask());
42 |                     Job nextJob = new Job();
43 |                     nextJob.setTask(latelyJob.getTask());
44 |                     nextJob.setDelay(latelyJob.getDelay());
45 |                     nextJob.setStartTime(System.currentTimeMillis() + latelyJob.getDelay());
46 |                     queue.offer(nextJob);
47 |                 } else {
48 |                     LockSupport.parkUntil(latelyJob.getStartTime());
49 |                 }
50 |             }
51 |         });
52 | 
53 |         {
54 |             thread.start();
55 |             System.out.println("触发器启动了!");
56 |         }
57 | 
58 |         void wakeUp() {
59 |             LockSupport.unpark(thread);
60 |         }
61 |     }
62 | 
63 | 
64 | }
65 | 


--------------------------------------------------------------------------------