content: /*
   * Copyright (C) 2016-2023 ActionTech.
   * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher.
   */
  
  package com.actiontech.dble.services.manager.response;
  
  import com.actiontech.dble.backend.mysql.PacketUtil;
  import com.actiontech.dble.config.Fields;
  import com.actiontech.dble.net.mysql.*;
  import com.actiontech.dble.services.manager.ManagerService;
  import com.actiontech.dble.route.RouteResultsetNode;
  import com.actiontech.dble.server.NonBlockingSession;
  import com.actiontech.dble.singleton.XASessionCheck;
  import com.actiontech.dble.util.StringUtil;
  
  import java.nio.ByteBuffer;
  
  /**
   * show front session and associated xa transaction details
   *
   * @author collapsar
   */
  public final class ShowXASession {
      private ShowXASession() {
      }
  
      private static final int FIELD_COUNT = 4;
      private static final ResultSetHeaderPacket HEADER = PacketUtil.getHeader(FIELD_COUNT);
      private static final FieldPacket[] FIELDS = new FieldPacket[FIELD_COUNT];
      private static final EOFPacket EOF = new EOFPacket();
  
      static {
          int i = 0;
          byte packetId = 0;
          HEADER.setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("FRONT_ID", Fields.FIELD_TYPE_VARCHAR);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("XA_ID", Fields.FIELD_TYPE_VARCHAR);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("XA_STATE", Fields.FIELD_TYPE_VARCHAR);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("SHARDING_NODES", Fields.FIELD_TYPE_VARCHAR);
          FIELDS[i].setPacketId(++packetId);
  
          EOF.setPacketId(++packetId);
      }
  
      public static void execute(ManagerService service) {
          ByteBuffer buffer = service.allocate();
  
          // write header
          buffer = HEADER.write(buffer, service, true);
  
          // write fields
          for (FieldPacket field : FIELDS) {
              buffer = field.write(buffer, service, true);
          }
  
          // write eof
          buffer = EOF.write(buffer, service, true);
  
          // write rows
          byte packetId = EOF.getPacketId();
          final XASessionCheck xaCheck = XASessionCheck.getInstance();
          for (NonBlockingSession commitSession : xaCheck.getCommittingSession().values()) {
              RowDataPacket row = getRow(commitSession, service.getCharset().getResults());
              row.setPacketId(++packetId);
              buffer = row.write(buffer, service, true);
          }
          for (NonBlockingSession rollbackSession : xaCheck.getRollbackingSession().values()) {
              RowDataPacket row = getRow(rollbackSession, service.getCharset().getResults());
              row.setPacketId(++packetId);
              buffer = row.write(buffer, service, true);
          }
  
          // write last eof
          EOFRowPacket lastEof = new EOFRowPacket();
          lastEof.setPacketId(++packetId);
  
  
          lastEof.write(buffer, service);
      }
  
      private static RowDataPacket getRow(NonBlockingSession session, String charset) {
          RowDataPacket row = new RowDataPacket(FIELD_COUNT);
          row.add(StringUtil.encode(session.getShardingService().getConnection().getId() + "", charset));
          row.add(StringUtil.encode(session.getSessionXaID() + "", charset));
          row.add(StringUtil.encode(session.getTransactionManager().getXAStage(), charset));
          StringBuilder sb = new StringBuilder();
          for (RouteResultsetNode node : session.getTargetKeys()) {
              sb.append(node.getName()).append(" ");
          }
          row.add(StringUtil.encode(sb.toString(), charset));
          return row;
      }
  }
  