package org.jbpm.simulation.impl.time;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import org.apache.commons.math.random.RandomData;
import org.apache.commons.math.random.RandomDataImpl;
import org.jbpm.simulation.TimeGenerator;
import org.jbpm.simulation.util.SimulationConstants;
import org.jbpm.simulation.util.SimulationUtils;
public class PoissonTimeGenerator implements TimeGenerator {
private Map<String, Object> data;
private static RandomData generator = new RandomDataImpl();
private TimeUnit timeUnit = TimeUnit.MILLISECONDS;
public PoissonTimeGenerator(Map<String, Object> data) {
this.data = data;
}
public long generateTime() {
TimeUnit tu = SimulationUtils.getTimeUnit(data);
long mean = (long)SimulationUtils.asDouble(data.get(SimulationConstants.MEAN));
mean = timeUnit.convert(mean, tu);
if(mean > 0) {
return (long) generator.nextPoisson(mean);
} else {
return 0;
}
}
}