Sundial
A Lightweight Job Scheduling Framework for Java.
In a Nutshell
Sundial makes adding scheduled jobs to your Java application a walk in the park. Simply define jobs, define triggers, and start the Sundial scheduler.
Long Description
Sundial is a lightweight Java job scheduling framework forked from Quartz (http://www.quartz-scheduler.org/) stripped down to the bare essentials. Sundial also hides the nitty-gritty configuration details of Quartz, reducing the time needed to get a simple RAM job scheduler up and running. Sundial uses a ThreadLocal wrapper for each job containing a HashMap for job key-value pairs. Convenience methods allow easy access to these parameters. JobActions are reusable components that also have access to the context parameters. If you are looking for a hassle-free 100% Java job scheduling framework that is easy to integrate into your applications, look no further.
Features
- Apache 2.0 license
- ~150 KB Jar
- In-memory multi-threaded jobs
- Define jobs and triggers in jobs.xml
- or define jobs and triggers via annotations
- or define jobs and triggers programmatically
- Cron Triggers
- Simple Triggers
- Java 6 and up
- Depends only on slf4j
Create a Job Class
public class SampleJob extends org.knowm.sundial.Job {
@Override
public void doRun() throws JobInterruptException {
// Do something interesting...
}
}
...with CronTrigger or SimpleTrigger Annotation
@CronTrigger(cron = "0/5 * * * * ?")
@SimpleTrigger(repeatInterval = 30, timeUnit = TimeUnit.SECONDS)
Start Sundial Job Scheduler
public static void main(String[] args) {
SundialJobScheduler.startScheduler("org.knowm.sundial.jobs"); // package with annotated Jobs
}
Alternatively, Put an XML File Called jobs.xml on Classpath
<?xml version='1.0' encoding='utf-8'?>
<job-scheduling-data>
<schedule>
<!-- job with cron trigger -->
<job>
<name>SampleJob3</name>
<job-class>com.foo.bar.jobs.SampleJob3</job-class>
<concurrency-allowed>true</concurrency-allowed>
</job>
<trigger>
<cron>
<name>SampleJob3-Trigger</name>
<job-name>SampleJob3</job-name>
<cron-expression>*/15 * * * * ?</cron-expression>
</cron>
</trigger>
<!-- job with simple trigger -->
<job>
<name>SampleJob2</name>
<job-class>com.foo.bar.jobs.SampleJob2</job-class>
<job-data-map>
<entry>
<key>MyParam</key>
<value>42</value>
</entry>
</job-data-map>
</job>
<trigger>
<simple>
<name>SampleJob2-Trigger</name>
<job-name>SampleJob2</job-name>
<repeat-count>5</repeat-count>
<repeat-interval>5000</repeat-interval>
</simple>
</trigger>
</schedule>
</job-scheduling-data>
Or, Define Jobs and Triggers Manually
SundialJobScheduler.addJob("SampleJob", "org.knowm.sundial.jobs.SampleJob");
SundialJobScheduler.addCronTrigger("SampleJob-Cron-Trigger", "SampleJob", "0/10 * * * * ?");
SundialJobScheduler.addSimpleTrigger("SampleJob-Simple-Trigger", "SampleJob", -1, TimeUnit.SECONDS.toMillis(3));
More Functions
// asynchronously start a job by name
SundialJobScheduler.startJob("SampleJob");
// interrupt a running job
SundialJobScheduler.stopJob("SampleJob");
// remove a job from the scheduler
SundialJobScheduler.removeJob("SampleJob");
// remove a trigger from the scheduler
SundialJobScheduler.removeTrigger("SampleJob-Trigger");
// lock scheduler
SundialJobScheduler.lockScheduler();
// unlock scheduler
SundialJobScheduler.unlockScheduler();
// check if job a running
SundialJobScheduler.isJobRunning("SampleJob");
And many more useful functions. See all here: https://github.com/timmolter/Sundial/blob/develop/src/main/java/org/knowm/sundial/SundialJobScheduler.java
Job Data Map
// asynchronously start a job by name with data map
Map<String, Object> params = new HashMap<>();
params.put("MY_KEY", new Integer(660));
SundialJobScheduler.startJob("SampleJob1", params);
// annotate CronTrigger with data map (separate key/values with ":" )
@CronTrigger(cron = "0/5 * * * * ?", jobDataMap = { "KEY_1:VALUE_1", "KEY_2:1000" })
public class SampleJob extends Job {
}
<!-- configure data map in jobs.xml -->
<job>
<name>SampleJob</name>
<job-class>org.knowm.sundial.jobs.SampleJob</job-class>
<job-data-map>
<entry>
<key>MyParam</key>
<value>42</value>
</entry>
</job-data-map>
</job>
// access data inside Job
String value1 = getJobContext().get("KEY_1");
logger.info("value1 = " + value1);
Get Organized with Job Actions!
With JobAction
s, you can encapsule logic that can be shared by different Job
s.
public class SampleJobAction extends JobAction {
@Override
public void doRun() {
Integer myValue = getJobContext().get("MyValue");
// Do something interesting...
}
}
// Call the JobAction from inside a Job
getJobContext().put("MyValue", new Integer(123));
new SampleJobAction().run();
Job Termination
To terminate a Job asynchronously, you can call the SundialJobScheduler.stopJob(String jobName)
method. The Job termination mechanism works by setting a flag that the Job should be terminated, but it is up to the logic in the Job to decide at what point termination should occur. Therefore, in any long-running job that you anticipate the need to terminate, put the method call checkTerminated()
at an appropriate location.
Concurrent Job Execution
By default jobs are not set to concurrently execute. This means if a job is currently running and a trigger is fired for that job, it will skip running the job. In some cases concurrent job execution is desired and there are a few ways to configure it.
- You can add
<concurrency-allowed>true</concurrency-allowed>
in jobs.xml. - You can add it to the Sundial annotations like this:
@SimpleTrigger(repeatInterval = 30, timeUnit = TimeUnit.SECONDS, isConcurrencyAllowed = true)
Same idea for cron annotation too.
Now go ahead and study some more examples, download the thing and provide feedback.
Getting the Goods
Non-Maven
Download Jar: http://knowm.org/open-source/sundial/sundial-change-log/
Dependencies
- org.slf4j.slf4j-api-1.7.10
Maven
The Sundial release artifacts are hosted on Maven Central.
Add the Sundial library as a dependency to your pom.xml file:
<dependency>
<groupId>org.knowm</groupId>
<artifactId>sundial</artifactId>
<version>2.1.0</version>
</dependency>
For snapshots, add the following to your pom.xml file:
<repository>
<id>sonatype-oss-snapshot</id>
<snapshots/>
<url>https://oss.sonatype.org/content/repositories/snapshots</url>
</repository>
<dependency>
<groupId>org.knowm</groupId>
<artifactId>sundial</artifactId>
<version>2.1.1-SNAPSHOT</version>
</dependency>
Building
mvn clean package
mvn javadoc:javadoc
Cron Expressions in jobs.xml
See the Cron Trigger tutorial over at quartz-scheduler.org. Here are a few examples:
Expression | Meaning |
---|---|
0 0 12 * * ? | Fire at 12pm (noon) every day |
0 15 10 * * ? | Fire at 10:15am every day |
0 15 10 ? * MON-FRI | Fire at 10:15am every Monday, Tuesday, Wednesday, Thursday and Friday |
0 0/10 * * * ? | Fire every 10 mintes starting at 12 am (midnight) every day |
Bugs
Please report any bugs or submit feature requests to Sundial's Github issue tracker.
Continuous Integration
Donations
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Release Information
We will announce new releases on our Twitter page.