pom.xml

<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/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.caseystella.stellar</groupId>
  <artifactId>custom</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>custom</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
      <groupId>org.apache.metron</groupId>
      <artifactId>metron-common</artifactId>
      <version>0.3.1</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>

TimeFunction.java

package com.notmetron.stellar;

import org.apache.metron.common.dsl.Context;
import org.apache.metron.common.dsl.ParseException;
import org.apache.metron.common.dsl.Stellar;
import org.apache.metron.common.dsl.StellarFunction;

import java.util.List;

public class TimeFunction {
  @Stellar(
         name="NOW",
          description = "Right now!",
          params = {},
          returns="Timestamp"
  )
  public static class Now implements StellarFunction {

    public Object apply(List<Object> list, Context context) throws ParseException {
      return System.currentTimeMillis();
    }

    public void initialize(Context context) {

    }

    public boolean isInitialized() {
      return true;
    }
  }
}