content: /*
   * Copyright (C) 2016-2023 ActionTech.
   * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher.
   */
  
  package com.actiontech.dble.backend.mysql.nio.handler.query.impl.subquery;
  
  import com.actiontech.dble.backend.mysql.nio.handler.util.HandlerTool;
  import com.actiontech.dble.config.ErrorCode;
  import com.actiontech.dble.config.model.SystemConfig;
  import com.actiontech.dble.net.Session;
  import com.actiontech.dble.net.mysql.FieldPacket;
  import com.actiontech.dble.net.mysql.RowDataPacket;
  import com.actiontech.dble.net.service.AbstractService;
  import com.actiontech.dble.plan.common.field.Field;
  import com.actiontech.dble.plan.common.item.Item;
  import com.actiontech.dble.plan.common.item.ItemString;
  import com.actiontech.dble.plan.common.item.subquery.ItemInSubQuery;
  import com.actiontech.dble.plan.node.ManagerTableNode;
  import com.actiontech.dble.plan.node.PlanNode;
  import org.jetbrains.annotations.NotNull;
  
  import java.util.Collections;
  import java.util.List;
  
  import static com.actiontech.dble.plan.optimizer.JoinStrategyProcessor.NEED_REPLACE;
  
  public class InSubQueryHandler extends SubQueryHandler {
      private int maxPartSize = 2000;
      private int maxConnSize = 4;
      private int rowCount = 0;
      private Field sourceField;
      private ItemInSubQuery itemSubQuery;
  
      public InSubQueryHandler(long id, Session session, ItemInSubQuery itemSubQuery, boolean isExplain) {
          super(id, session);
          this.itemSubQuery = itemSubQuery;
          this.maxPartSize = SystemConfig.getInstance().getNestLoopRowsSize();
          this.maxConnSize = SystemConfig.getInstance().getNestLoopConnSize();
          if (isExplain) {
              setForExplain();
          }
      }
  
      @Override
      public void fieldEofResponse(byte[] headerNull, List<byte[]> fieldsNull, List<FieldPacket> fieldPackets,
                                   byte[] eofNull, boolean isLeft, @NotNull AbstractService service) {
          session.setHandlerStart(this);
          if (terminate.get()) {
              return;
          }
          lock.lock();
          try {
              // create field for first time
              if (this.fieldPackets.isEmpty()) {
                  this.fieldPackets = fieldPackets;
                  sourceField = HandlerTool.createField(this.fieldPackets.get(0));
                  Item select = itemSubQuery.getSelect();
                  PlanNode planNode = itemSubQuery.getPlanNode();
                  if (!(planNode instanceof ManagerTableNode) || ((ManagerTableNode) planNode).isNeedSendMaker()) {
                      select.setPushDownName(select.getAlias());
                  }
                  Item tmpItem = HandlerTool.createItem(select, Collections.singletonList(this.sourceField), 0, isAllPushDown(), type());
                  itemSubQuery.setFiled(tmpItem);
              }
          } finally {
              lock.unlock();
          }
      }
  
      @Override
      public boolean rowResponse(byte[] rowNull, RowDataPacket rowPacket, boolean isLeft, @NotNull AbstractService service) {
          lock.lock();
          try {
              if (terminate.get()) {
                  return true;
              }
              if (++rowCount > maxPartSize * maxConnSize) {
                  String errMessage = "sub query too much rows!";
                  LOGGER.info(errMessage);
                  genErrorPackage(ErrorCode.ER_UNKNOWN_ERROR, errMessage);
                  service.getConnection().close(errMessage);
                  try {
                      tempDoneCallBack.call();
                  } catch (Exception callback) {
                      LOGGER.info("callback exception!", callback);
                  }
                  return true;
              }
              RowDataPacket row = rowPacket;
              if (row == null) {
                  row = new RowDataPacket(this.fieldPackets.size());
                  row.read(rowNull);
              }
              sourceField.setPtr(row.getValue(0));
              Item value = itemSubQuery.getFiled().getResultItem();
              if (value == null) {
                  itemSubQuery.setContainNull(true);
              } else {
                  itemSubQuery.getValue().add(value);
              }
          } finally {
              lock.unlock();
          }
          return false;
      }
  
  
      @Override
      public HandlerType type() {
          return HandlerType.IN_SUB_QUERY;
      }
  
      @Override
      public void setForExplain() {
          itemSubQuery.getValue().add(new ItemString(NEED_REPLACE, itemSubQuery.getCharsetIndex()));
      }
  
  
      @Override
      public void clearForExplain() {
          itemSubQuery.getValue().clear();
      }
  
      @Override
      public ExplainType explainType() {
          return ExplainType.IN_SUB_QUERY;
      }
  
  }
  