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.mysql.*;
  import com.actiontech.dble.services.manager.ManagerService;
  import com.actiontech.dble.util.FormatUtil;
  import com.actiontech.dble.util.LongUtil;
  import com.actiontech.dble.util.StringUtil;
  import com.actiontech.dble.util.TimeUtil;
  
  import java.nio.ByteBuffer;
  
  /**
   * ShowServer
   *
   * @author mycat
   * @author mycat
   */
  public final class ShowServer {
      private ShowServer() {
      }
  
      private static final int FIELD_COUNT = 7;
      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("UPTIME", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("USED_MEMORY",
                  Fields.FIELD_TYPE_LONGLONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("TOTAL_MEMORY",
                  Fields.FIELD_TYPE_LONGLONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("MAX_MEMORY",
                  Fields.FIELD_TYPE_LONGLONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("RELOAD_TIME",
                  Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("CHARSET", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("STATUS", Fields.FIELD_TYPE_VAR_STRING);
          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();
          RowDataPacket row = getRow(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(String charset) {
          DbleServer server = DbleServer.getInstance();
          long startupTime = server.getStartupTime();
          long now = TimeUtil.currentTimeMillis();
          long upTime = now - startupTime;
          Runtime rt = Runtime.getRuntime();
          long total = rt.totalMemory();
          long max = rt.maxMemory();
          long used = (total - rt.freeMemory());
          RowDataPacket row = new RowDataPacket(FIELD_COUNT);
          row.add(StringUtil.encode(FormatUtil.formatTime(upTime, 3), charset));
          row.add(LongUtil.toBytes(used));
          row.add(LongUtil.toBytes(total));
          row.add(LongUtil.toBytes(max));
          row.add(StringUtil.encode(FormatUtil.formatDate(server.getConfig().getReloadTime()), charset));
          row.add(StringUtil.encode(charset, charset));
          row.add(StringUtil.encode(DbleServer.getInstance().isOnline() ? "ON" : "OFF", charset));
          return row;
      }
  
  }
  