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.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.statistic.stat.ThreadWorkUsage;
  import com.actiontech.dble.util.StringUtil;
  
  import java.nio.ByteBuffer;
  import java.util.Map;
  import java.util.TreeMap;
  
  public final class ShowThreadUsed {
      private ShowThreadUsed() {
      }
  
      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("THREAD_NAME", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
          FIELDS[i] = PacketUtil.getField("LAST_QUARTER_MIN", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
          FIELDS[i] = PacketUtil.getField("LAST_MINUTE", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
          FIELDS[i] = PacketUtil.getField("LAST_FIVE_MINUTE", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i].setPacketId(++packetId);
          EOF.setPacketId(++packetId);
      }
  
      public static void execute(ManagerService service) {
          ByteBuffer buffer = service.allocate();
  
          buffer = HEADER.write(buffer, service, true);
  
          for (FieldPacket field : FIELDS) {
              buffer = field.write(buffer, service, true);
          }
  
          buffer = EOF.write(buffer, service, true);
  
  
          byte packetId = EOF.getPacketId();
          Map<String, ThreadWorkUsage> threadUsedMap = new TreeMap<>(DbleServer.getInstance().getThreadUsedMap());
          for (Map.Entry<String, ThreadWorkUsage> entry : threadUsedMap.entrySet()) {
              RowDataPacket row = getRow(entry.getKey(), entry.getValue(), service.getCharset().getResults());
              row.setPacketId(++packetId);
              buffer = row.write(buffer, service, true);
          }
  
          EOFRowPacket lastEof = new EOFRowPacket();
          lastEof.setPacketId(++packetId);
  
          lastEof.write(buffer, service);
      }
  
      private static RowDataPacket getRow(String name, ThreadWorkUsage workUsage, String charset) {
          RowDataPacket row = new RowDataPacket(FIELD_COUNT);
          row.add(StringUtil.encode(name, charset));
          String[] workUsages = workUsage.getUsedPercent();
          row.add(StringUtil.encode(workUsages[0], charset));
          row.add(StringUtil.encode(workUsages[1], charset));
          row.add(StringUtil.encode(workUsages[2], charset));
          return row;
      }
  }
  