jcron's Introduction

JCron

Simple lightweight schedule engine for Java.

I'm test this libary since a year and it works. So I make it public.

Check out the JavaDoc

Add to your project

Maven

Add Jitpack as Repository

<repositories>
	<repository>
	    <id>jitpack.io</id>
	    <url>https://jitpack.io</url>
    </repository>
</repositories>

Add JCron

<dependency>
    <groupId>com.github.timia2109</groupId>
    <artifactId>JCron</artifactId>
    <version>1.0.1</version>
</dependency>

Gradle

Add Jitpack as Repository

allprojects {
	repositories {
		...
		maven { url 'https://jitpack.io' }
	}
}

Add JCron

dependencies {
        implementation 'com.github.timia2109:JCron:1.0.1'
}

Examples

Create a simple cron task at a fixed time

public class SimpleCronTask implements CronTask {

    // Store the next execution time
    private long execution_time;

    public SimpleCronTask() {
        this.execution_time = System.currentTimeMillis() + (1000*60); // In 1 Minute
    }

    @Override
    public boolean restart() {
        // Should this task restart? In this case not
        return false;
    }

    @Override
    public long getNextTime() {
        // return the next execution time (this MUST be a fix value)
        return execution_time;
    }

    @Override
    public void exec() {
        // Do the stuff you want
        System.out.println("Wuhuu the SimpleCronTime has executed");
    }
}

Create a simple intervaled task

public class SimpleIntervalTask extends IntervaledObject {

    private int tick;

    public SimpleIntervalTask() {
        // Start now and run every minute
        super(System.currentTimeMillis(), 60*1000);

        tick = 0;
    }

    @Override
    public void exec() {
        // Do the stuff you want
        System.out.printf("Tick %d from the SimpleIntervalTask\n", ++tick);
    }
}

Add them to the cron system and start

SimpleCronTask simpleCronTask = new SimpleCronTask();
SimpleIntervalTask simpleIntervalTask = new SimpleIntervalTask();

JCron.getInstance().addTask(simpleCronTask, simpleIntervalTask);
JCron.getInstance().start();

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