content: /*
   * Copyright (C) 2016-2023 ActionTech.
   * based on code by MyCATCopyrightHolder Copyright (c) 2013, OpenCloudDB/MyCAT.
   * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher.
   */
  package com.actiontech.dble.services.manager.response;
  
  import com.actiontech.dble.DbleServer;
  import com.actiontech.dble.backend.mysql.PacketUtil;
  import com.actiontech.dble.config.Fields;
  import com.actiontech.dble.net.IOProcessor;
  import com.actiontech.dble.net.mysql.*;
  import com.actiontech.dble.services.manager.ManagerService;
  import com.actiontech.dble.util.LongUtil;
  
  import java.nio.ByteBuffer;
  
  /**
   * Show Command times
   *
   * @author mycat
   * @author mycat
   */
  public final class ShowCommandCount {
      private ShowCommandCount() {
      }
  
      private static final int FIELD_COUNT = 1;
      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 {
          byte packetId = 0;
          HEADER.setPacketId(++packetId);
  
          FIELDS[0] = PacketUtil.getField("QUERY_COUNT", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[0].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();
          RowDataPacket row = getRow();
          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() {
          long querys = 0;
          for (IOProcessor p : DbleServer.getInstance().getFrontProcessors()) {
              querys += p.getCommands().queryCount();
          }
  
          RowDataPacket row = new RowDataPacket(FIELD_COUNT);
          row.add(LongUtil.toBytes(querys));
          return row;
      }
  
  }
  