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.DbleServer;
  import com.actiontech.dble.backend.datasource.PhysicalDbGroup;
  import com.actiontech.dble.backend.datasource.PhysicalDbInstance;
  import com.actiontech.dble.backend.mysql.PacketUtil;
  import com.actiontech.dble.config.Fields;
  import com.actiontech.dble.config.FlowControllerConfig;
  import com.actiontech.dble.config.model.db.DbInstanceConfig;
  import com.actiontech.dble.config.model.db.PoolConfig;
  import com.actiontech.dble.net.mysql.*;
  import com.actiontech.dble.services.manager.ManagerService;
  import com.actiontech.dble.singleton.FlowController;
  import com.actiontech.dble.util.LongUtil;
  import com.actiontech.dble.util.StringUtil;
  
  import java.nio.ByteBuffer;
  import java.util.Map;
  
  /**
   * Created by szf on 2020/4/10.
   */
  public final class FlowControlShow {
  
      private static final int FIELD_COUNT = 3;
      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("FLOW_CONTROL_TYPE", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("FLOW_CONTROL_HIGH_LEVEL", Fields.FIELD_TYPE_LONGLONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("FLOW_CONTROL_LOW_LEVEL", Fields.FIELD_TYPE_LONGLONG);
          FIELDS[i].setPacketId(++packetId);
  
          EOF.setPacketId(++packetId);
      }
  
      private FlowControlShow() {
  
      }
  
      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();
  
          FlowControllerConfig config = FlowController.getFlowControllerConfig();
          if (config.isEnableFlowControl()) {
              //find
              {
                  RowDataPacket row = new RowDataPacket(FIELD_COUNT);
                  row.add(StringUtil.encode("FRONT_END", service.getCharset().getResults()));
                  row.add(LongUtil.toBytes(config.getHighWaterLevel()));
                  row.add(LongUtil.toBytes(config.getLowWaterLevel()));
                  row.setPacketId(++packetId);
                  buffer = row.write(buffer, service, true);
              }
  
              Map<String, PhysicalDbGroup> dbGroups = DbleServer.getInstance().getConfig().getDbGroups();
              for (PhysicalDbGroup dbGroup : dbGroups.values()) {
                  for (PhysicalDbInstance dbInstance : dbGroup.getDbInstances(true)) {
                      DbInstanceConfig dbInstanceConfig = dbInstance.getConfig();
                      PoolConfig poolConfig = dbInstanceConfig.getPoolConfig();
                      RowDataPacket row = new RowDataPacket(FIELD_COUNT);
                      row.add(StringUtil.encode(dbGroup.getGroupName() + "-" + dbInstance.getName(), service.getCharset().getResults()));
                      row.add(LongUtil.toBytes(poolConfig.getFlowHighLevel()));
                      row.add(LongUtil.toBytes(poolConfig.getFlowLowLevel()));
                      row.setPacketId(++packetId);
                      buffer = row.write(buffer, service, true);
                  }
              }
          }
          // write last eof
          EOFRowPacket lastEof = new EOFRowPacket();
          lastEof.setPacketId(++packetId);
  
  
          lastEof.write(buffer, service);
      }
  }
  