Configuration changes for AEM Schedulers?

Question

I am trying to implement simple scheduler for my project requirement, my project is using Adobe AEM. As of now I gone through Adobe site and tried to implement the

Answer 1

You missed to set immediate = true. This starts/activates an component/service automatically with the bundle-start. Otherwise the service is only started, if another (already started) service requests this service (or has a dependency).

In OSGi all services are lazy started, and stopped as soon as nobody needs them. I agree, it could be improved, if the scheduler service would automatically start all services that it would trigger. But that's the way it is.

---

This is a working example.

@Component(immediate = true, metatype = true)
@Service({ Runnable.class, AnotherServiceInterface.class})
@Properties({
   // run every 5 seconds
   @Property(name = "scheduler.period", longValue = 5),
   // no concurrent execution
   @Property(name = "scheduler.concurrent", propertyPrivate = true, boolValue = false)
})

Answer 2

Following solution worked as required, here three cases are handled

• with addJob() : executes the job every minute
• with addPeriodicJob() : executes the job every 3 minutes

• with fireJobAt() : executes the job at a specific date (date of deployment + delay of 30 seconds)

  import java.io.Serializable;
  import java.util.Date;
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.felix.scr.annotations.Component;
  import org.apache.felix.scr.annotations.Reference;
  import org.apache.sling.commons.scheduler.Scheduler;
  import org.osgi.service.component.ComponentContext;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  @Component
  public class ScheduledPeriodicJob {
  
  /** Default log. */
  protected final Logger log = LoggerFactory.getLogger(this.getClass());
  
  /** The scheduler for rescheduling jobs. */
  @Reference
  private Scheduler scheduler;
  
  
  protected void activate(ComponentContext componentContext) throws Exception {
      //case 1: with addJob() method: executes the job every minute
              String schedulingExpression = "0 * * * * ?";
              String jobName1 = "case1";
              Map<String, Serializable> config1 = new HashMap<String, Serializable>();
              boolean canRunConcurrently = true;
              final Runnable job1 = new Runnable() {
                  public void run() {
                      log.info("\n\nExecuting");
                      log.info("\n\nExecuting");
                      log.info("\n\nExecuting");
                      log.info("\n\nExecuting");
                      log.info("\n\nExecuting");
                      log.info("\n\nExecuting");
                      log.info("\n\nExecuting");
                      log.info("\n\nExecuting");
                      log.info("\n\nExecuting");
                  }
              };
              try {
                  this.scheduler.addJob(jobName1, job1, config1, schedulingExpression, canRunConcurrently);
              } catch (Exception e) {
                  job1.run();
              }
  
      //case 2: with addPeriodicJob(): executes the job every 3 minutes
              String jobName2 = "case2";
              long period = 180;
              Map<String, Serializable> config2 = new HashMap<String, Serializable>();
              final Runnable job2 = new Runnable() {
                  public void run() {
                      log.info("\nExecuting 2");
                      log.info("\nExecuting 2");
                      log.info("\nExecuting 2");
                      log.info("\nExecuting 2");
                      log.info("\nExecuting 2");
                      log.info("\nExecuting 2");
                      log.info("\nExecuting 2");
                      log.info("\nExecuting 2");
                  }
              };
              try {
                  this.scheduler.addPeriodicJob(jobName2, job2, config2, period, canRunConcurrently);
              } catch (Exception e) {
                  job2.run();
              }
  
      //case 3: with fireJobAt(): executes the job at a specific date (date of deployment + delay of 30 seconds)
              String jobName3 = "case3";
              final long delay = 30*1000;
              final Date fireDate = new Date();
              fireDate.setTime(System.currentTimeMillis() + delay);
              Map<String, Serializable> config3 = new HashMap<String, Serializable>();
              final Runnable job3 = new Runnable() {
                  public void run() {
                      log.info("\nExecuting at date: {} with a delay of: {} seconds", fireDate, delay/1000);
                      log.info("\nExecuting at date: {} with a delay of: {} seconds", fireDate, delay/1000);
                      log.info("\nExecuting at date: {} with a delay of: {} seconds", fireDate, delay/1000);
                      log.info("\nExecuting at date: {} with a delay of: {} seconds", fireDate, delay/1000);
                      log.info("\nExecuting at date: {} with a delay of: {} seconds", fireDate, delay/1000);
                      log.info("\nExecuting at date: {} with a delay of: {} seconds", fireDate, delay/1000);
                      log.info("\nExecuting at date: {} with a delay of: {} seconds", fireDate, delay/1000);
                      log.info("\nExecuting at date: {} with a delay of: {} seconds", fireDate, delay/1000);
                      log.info("\nExecuting at date: {} with a delay of: {} seconds", fireDate, delay/1000);
                      log.info("\nExecuting at date: {} with a delay of: {} seconds", fireDate, delay/1000);
                  }
              };
              try {
                  this.scheduler.fireJobAt(jobName3, job3, config3, fireDate);
              } catch (Exception e) {
                  job3.run();
              }
  }
  
  protected void deactivate(ComponentContext componentContext) {
      log.info("Deactivateddbye!");
  }
  
  }
  

Below is pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd ">
    <modelVersion>4.0.0</modelVersion>
    <!-- ====================================================================== -->
    <!-- P A R E N T P R O J E C T D E S C R I P T I O N -->
    <!-- ====================================================================== -->
    <parent>
        <groupId>com.adobe.cq</groupId>
        <artifactId>schedule</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <!-- ====================================================================== -->
    <!-- P R O J E C T D E S C R I P T I O N -->
    <!-- ====================================================================== -->

    <artifactId>schedule-bundle</artifactId>
    <packaging>bundle</packaging>
    <name>My Project Bundle</name>

    <dependencies>
        <dependency>
            <groupId>org.osgi</groupId>
            <artifactId>org.osgi.compendium</artifactId>
        </dependency>
        <dependency>
            <groupId>org.osgi</groupId>
            <artifactId>org.osgi.core</artifactId>
        </dependency>

        <dependency>
            <groupId>org.apache.felix</groupId>
            <artifactId>org.apache.felix.scr.annotations</artifactId>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
        </dependency>


        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
        </dependency>

        <dependency>
            <groupId>javax.mail</groupId>
            <artifactId>mail</artifactId>
            <version>1.4</version>
        </dependency>

        <dependency>
            <groupId>com.tagic</groupId>
            <artifactId>logger</artifactId>
            <version>0.0.1-SNAPSHOT</version>
            <scope>system</scope>
            <systemPath>${project.basedir}/lib/logger-0.0.1-SNAPSHOT.jar</systemPath>
        </dependency>

        <dependency>
            <groupId>com.tagic</groupId>
            <artifactId>org.apache.sling.commons.scheduler</artifactId>
            <version>0.0.1-SNAPSHOT</version>
            <scope>system</scope>
            <systemPath>${project.basedir}/lib/org.apache.sling.commons.scheduler-2.3.3-R1232965.jar</systemPath>
        </dependency>

</dependencies>

    <!-- ====================================================================== -->
    <!-- B U I L D D E F I N I T I O N -->
    <!-- ====================================================================== -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.felix</groupId>
                <artifactId>maven-scr-plugin</artifactId>
                <executions>
                    <execution>
                        <id>generate-scr-descriptor</id>
                        <goals>
                            <goal>scr</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.felix</groupId>
                <artifactId>maven-bundle-plugin</artifactId>
                <extensions>true</extensions>
                <configuration>
                    <instructions>
                        <Bundle-SymbolicName>com.adobe.cq.schedule-bundle</Bundle-SymbolicName>
                    </instructions>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.sling</groupId>
                <artifactId>maven-sling-plugin</artifactId>
                <configuration>
                    <slingUrl>http://${crx.host}:${crx.port}/apps/myproject/install</slingUrl>
                    <usePut>true</usePut>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-javadoc-plugin</artifactId>
                <configuration>
                    <excludePackageNames>
                        *.impl
                    </excludePackageNames>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>