问Spring Batch CompositeItemWriter，在每个委托编写器遍历结束时执行batch以提高性能

EN

public class Item{
  public List<WarningObject> warnings
  public List<ErrorObject> errors
  public Long Id;
  public String data1;
  public String data2;
  public String data3;
  // getters and setters

}

<bean id="compositeItemWriter" class="org.springframework.batch.item.support.CompositeItemWriter">
<property name="delegates">
<list>
    <ref bean="warningItemWriter"/>
    <ref bean="errorItemWriter"/>
    <ref bean="CustomJdbcItemWriter"/>
</list>
</property>

public class WarningItemWriter implements ItemWriter<Item>{

  @Autowire
   String sql;
  @AutoWire
   JdbcTemple jdbcTemplate;

  @Autowire
  ItemPreparedStatementSetter itemPreparedStatementSetter;

   @Override
   public void write(final List<? extends Item> items) throws Exception {
       for(Item item: items){

            jdbcTemplate.execute(sql,new PreparedStatementCallBack<int []>{
            @Override
                    public int[] doInPreparedStatement(PreparedStatement ps) throws SQLException, DataAccessException {
                        for (WarningObject warning: item.getWarnings) {
                            itemPreparedStatementSetter.setValues(warning, ps);
                            ps.addBatch();
                        }
                        return ps.executeBatch();

             });
        }
   }

}