RecordIterator.java

package org.prevayler.demos.scalability;
import java.io.Serializable;
import java.util.Random;

/** 
 * Generates Record objects with ids from 0 to numberOfRecords - 1.
 */
public class RecordIterator implements Serializable {
  private static final long serialVersionUID=4278565982042966467L;
  private int nextRecordId=0;
  private final int numberOfRecords;
  private final Random _random=new Random(0);
  public RecordIterator(  int numberOfRecords){
    this.numberOfRecords=numberOfRecords;
  }
  public boolean hasNext(){
    return nextRecordId < numberOfRecords;
  }
  public Record next(){
    indicateProgress();
    return new Record(nextRecordId++,_random);
  }
  private void indicateProgress(){
    if (nextRecordId == 0) {
      out("Creating " + numberOfRecords + " objects...");
      return;
    }
    if (nextRecordId % 100000 == 0)     out("" + nextRecordId + "...");
  }
  static private void out(  Object message){
    System.out.println(message);
  }
}