feat(ses): add scheduled-executor-service
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# Overview
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This project can serve as example for asynchronous task scheduling with Maven and Java.
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# Links
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[Generating random numbers in Java](https://www.geeksforgeeks.org/generating-random-numbers-in-java/)
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[https://www.geeksforgeeks.org/generating-random-numbers-in-java/](https://www.geeksforgeeks.org/scheduledexecutorservice-interface-in-java/)
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns="http://maven.apache.org/POM/4.0.0"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<name>ses</name>
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<description>description</description>
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<url>https://swingbe.de</url>
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<groupId>de.swingbe</groupId>
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<artifactId>ses</artifactId>
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<version>0.0.1</version>
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<packaging>jar</packaging>
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<licenses>
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<license>
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<name>GNU General Public License</name>
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<url>https://www.gnu.org/licenses/gpl-3.0.txt</url>
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</license>
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</licenses>
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<scm>
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<url>https://github.com/Software-Ingenieur-Begerad/sandbox-java</url>
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</scm>
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<properties>
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<!-- Other properties -->
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.8.1</version>
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<configuration>
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<!-- Target Java versions -->
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<release>11</release>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-shade-plugin</artifactId>
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<version>3.2.1</version>
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<executions>
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<execution>
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<phase>package</phase>
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<goals>
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<goal>shade</goal>
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</goals>
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<configuration>
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<filters>
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<filter>
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<!-- exclude signatures from merged JAR to avoid invalid signature messages -->
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<artifact>*:*</artifact>
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<excludes>
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<exclude>META-INF/*.SF</exclude>
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<exclude>META-INF/*.DSA</exclude>
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<exclude>META-INF/*.RSA</exclude>
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</excludes>
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</filter>
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</filters>
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<!-- The shaded JAR will not be the main artifact for the project, it will be attached
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for deployment in the way source and docs are. -->
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<shadedArtifactAttached>true
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</shadedArtifactAttached>
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<shadedClassifierName>shaded</shadedClassifierName>
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<transformers>
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<transformer
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implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
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<transformer
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implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
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<manifestEntries>
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<Main-Class>de.swingbe.ses.SchedulerExecutorServiceExample
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</Main-Class>
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</manifestEntries>
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</transformer>
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</transformers>
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</configuration>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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</project>
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package de.swingbe.ses;
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import java.util.concurrent.*;
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import java.util.*;
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//System.out.println();
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import java.io.*;
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class SchedulerExecutorServiceExample {
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public static void main(String[] args)
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{
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System.out.println(
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"A count-down-clock program that counts from 10 to 0");
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// creating a ScheduledExecutorService object
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ScheduledExecutorService scheduler
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= Executors.newScheduledThreadPool(11);
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// printing the current time
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System.out.println(
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"Current time : "
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+ Calendar.getInstance().get(Calendar.SECOND));
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// Scheduling the tasks
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for (int i = 10; i >= 0; i--) {
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scheduler.schedule(new Task(i), 10 - i,
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TimeUnit.SECONDS);
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}
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// remember to shutdown the scheduler
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// so that it no longer accepts
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// any new tasks
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scheduler.shutdown();
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}
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}
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class Task implements Runnable {
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private int num;
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public Task(int num) { this.num = num; }
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public void run()
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{
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if(num%1==0){
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// create instance of Random class
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Random rand = new Random();
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// Generate random integers in range 0 to 1999
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int randInt = rand.nextInt(2000);
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System.out.println("num: " +num+", rand: " + randInt);
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try {
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Thread.sleep(randInt);
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} catch (InterruptedException e) {
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System.out.println("Another thread has interrupted this one, message: " + e.getMessage() + ", trace: " + e.getStackTrace());
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}
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System.out.println("num: "+num+", sleep() done.");
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}
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System.out.println(
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"num: " + num + " Current time : "
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+ Calendar.getInstance().get(Calendar.SECOND));
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}
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}
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