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.buffer.BufferPool;
  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.IntegerUtil;
  import com.actiontech.dble.util.LongUtil;
  
  import java.nio.ByteBuffer;
  
  /**
   * ShowProcessor
   *
   * @author mycat
   * @author mycat
   */
  public final class ShowProcessor {
      private ShowProcessor() {
      }
  
      private static final int FIELD_COUNT = 12;
      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("NAME", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("NET_IN", Fields.FIELD_TYPE_LONGLONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("NET_OUT", Fields.FIELD_TYPE_LONGLONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("REACT_COUNT", Fields.FIELD_TYPE_LONGLONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("R_QUEUE", Fields.FIELD_TYPE_LONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("W_QUEUE", Fields.FIELD_TYPE_LONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("FREE_BUFFER", Fields.FIELD_TYPE_LONGLONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("TOTAL_BUFFER", Fields.FIELD_TYPE_LONGLONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("BU_PERCENT", Fields.FIELD_TYPE_TINY);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("BU_WARNS", Fields.FIELD_TYPE_LONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("FC_COUNT", Fields.FIELD_TYPE_LONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("BC_COUNT", Fields.FIELD_TYPE_LONG);
          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();
          for (IOProcessor p : DbleServer.getInstance().getFrontProcessors()) {
              RowDataPacket row = getRow(p);
              row.setPacketId(++packetId);
              buffer = row.write(buffer, service, true);
          }
          for (IOProcessor p : DbleServer.getInstance().getBackendProcessors()) {
              RowDataPacket row = getRow(p);
              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(IOProcessor processor) {
          BufferPool bufferPool = processor.getBufferPool();
          long bufferSize = bufferPool.size();
          long bufferCapacity = bufferPool.capacity();
          long bufferSharedOpts = bufferPool.getSharedOptsCount();
          long bufferUsagePercent = (bufferCapacity - bufferSize) * 100 / bufferCapacity;
          RowDataPacket row = new RowDataPacket(FIELD_COUNT);
          row.add(processor.getName().getBytes());
          row.add(LongUtil.toBytes(processor.getNetInBytes()));
          row.add(LongUtil.toBytes(processor.getNetOutBytes()));
          row.add(LongUtil.toBytes(0));
          row.add(IntegerUtil.toBytes(0));
          row.add(IntegerUtil.toBytes(processor.getWriteQueueSize()));
          row.add(LongUtil.toBytes(bufferSize));
          row.add(LongUtil.toBytes(bufferCapacity));
          row.add(LongUtil.toBytes(bufferUsagePercent));
          row.add(LongUtil.toBytes(bufferSharedOpts));
          row.add(IntegerUtil.toBytes(processor.getFrontends().size()));
          row.add(IntegerUtil.toBytes(processor.getBackends().size()));
          return row;
      }
  
  }
  