Plan about breakable IterationCallback in Mirage

BreakableIterationCallback1.java

// SqlManager#iterate()内でBreakableIterationCallbackだったらisBreak()をチェックするようなイメージ。
public abstract class BreakableIterationCallback<A, B> implements IterationCallback<A, B> {

  private boolean break = false;

  public void setBreak(){
    this.break = break;
  }

  public boolean isBreak(){
    return this.break;
  }
}

Integer result = sqlManager.iterate(
    Book.class,
    new BreakableIterationCallback<Book, Integer>() {
        private int result;
        @Override public Integer iterate(Book entity) {
            result = result + entity.price;
            if(result > 10000){
              setBreak();
            }
            return result;
        }
    },
    SQL_PREFIX + "SqlManagerImplTest_selectBooks.sql");

BreakableIterationCallback2.java

// 例外を投げるならこんな感じ？
public abstract class BreakableIterationCallback<A, B> implements IterationCallback<A, B> {
  protected void break(){
    throw new BreakIterationException();
  }
}

Integer result = sqlManager.iterate(
    Book.class,
    new BreakableIterationCallback<Book, Integer>() {
        private int result;
        @Override public Integer iterate(Book entity) {
            result = result + entity.price;
            if(result > 10000){
              break();
            }
            return result;
        }
    },
    SQL_PREFIX + "SqlManagerImplTest_selectBooks.sql");