spring batch 使用ItemReaderAdapter导致读写无限循环问题

来源：互联网发布：天刀血玲珑捏脸数据导编辑：程序博客网时间：2024/06/07 07:45

当同步数据时reader 或者 writer 调用现有的 service时候，会用到ItemReaderAdapter或者ItemWriterAdapter

例如

ItemReaderAdapter adapter = new ItemReaderAdapter();adapter.setTargetObject(orderService);adapter.setTargetMethod("dealOrder");

但是上面的写法，会导致reader 和 writer 无限循环，不能停止因此需要reader 计数 重新实现 ItemStream
public class OrderAdapterReader extends AbstractItemCountingItemStreamItemReader {    @Autowired    private OrderService orderService;    @Autowired    private HubOrderSqlOperation hubOrderSqlOperation;    private List<MongoOrder> mongoOrderList;    private final String ecName = "orderReaderContext";    public OrderAdapterReader() {        setName(ecName);    }    @Override    protected MongoOrder doRead() throws Exception {        MongoOrder mongoOrder = mongoOrderList.get(getCurrentItemCount() - 1);        return mongoOrder;    }    @Override    protected void doOpen() throws Exception {        mongoOrderList = (List<MongoOrder>) orderService.getDayOrders().getData();        if (CollectionUtils.isEmpty(mongoOrderList)){            setMaxItemCount(0);        }else{            List<Long> orderIds = mongoOrderList.stream().map(MongoOrder::getId).collect(Collectors.toList());            hubOrderSqlOperation.deleteOrderByIds(orderIds);            setMaxItemCount(mongoOrderList.size());        }    }    @Override    protected void doClose() throws Exception {        if (!CollectionUtils.isEmpty(mongoOrderList)){            mongoOrderList.clear();        }        setMaxItemCount(0);        setCurrentItemCount(0);    }}

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