content: /*
   * Copyright 1999-2012 Alibaba Group.
   *  
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *  
   *      http://www.apache.org/licenses/LICENSE-2.0
   *  
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.alibaba.cobar.manager.response;
  
  import java.nio.ByteBuffer;
  import java.text.DecimalFormat;
  import java.text.NumberFormat;
  
  import com.alibaba.cobar.config.Fields;
  import com.alibaba.cobar.manager.ManagerConnection;
  import com.alibaba.cobar.mysql.PacketUtil;
  import com.alibaba.cobar.net.mysql.EOFPacket;
  import com.alibaba.cobar.net.mysql.FieldPacket;
  import com.alibaba.cobar.net.mysql.ResultSetHeaderPacket;
  import com.alibaba.cobar.net.mysql.RowDataPacket;
  import com.alibaba.cobar.util.LongUtil;
  import com.alibaba.cobar.util.StringUtil;
  
  /**
   * 查询各SQL在所有pool中的执行情况
   * 
   * @author wenfeng.cenwf 2011-4-20
   */
  public final class ShowSQLExecute {
  
      private static final NumberFormat nf = DecimalFormat.getInstance();
      private static final int FIELD_COUNT = 5;
      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 {
          nf.setMaximumFractionDigits(3);
  
          int i = 0;
          byte packetId = 0;
          header.packetId = ++packetId;
  
          fields[i] = PacketUtil.getField("SQL_ID", Fields.FIELD_TYPE_LONGLONG);
          fields[i++].packetId = ++packetId;
  
          fields[i] = PacketUtil.getField("EXECUTE", Fields.FIELD_TYPE_LONGLONG);
          fields[i++].packetId = ++packetId;
  
          fields[i] = PacketUtil.getField("TIME", Fields.FIELD_TYPE_DOUBLE);
          fields[i++].packetId = ++packetId;
  
          fields[i] = PacketUtil.getField("MAX_TIME", Fields.FIELD_TYPE_DOUBLE);
          fields[i++].packetId = ++packetId;
  
          fields[i] = PacketUtil.getField("MIN_TIME", Fields.FIELD_TYPE_DOUBLE);
          fields[i++].packetId = ++packetId;
  
          eof.packetId = ++packetId;
      }
  
      public static void execute(ManagerConnection c) {
          ByteBuffer buffer = c.allocate();
  
          // write header
          buffer = header.write(buffer, c);
  
          // write fields
          for (FieldPacket field : fields) {
              buffer = field.write(buffer, c);
          }
  
          // write eof
          buffer = eof.write(buffer, c);
  
          // write rows
          byte packetId = eof.packetId;
          for (int i = 0; i < 3; i++) {
              RowDataPacket row = getRow(1000 * (i + 1), c.getCharset());
              row.packetId = ++packetId;
              buffer = row.write(buffer, c);
          }
  
          // write last eof
          EOFPacket lastEof = new EOFPacket();
          lastEof.packetId = ++packetId;
          buffer = lastEof.write(buffer, c);
  
          // write buffer
          c.write(buffer);
      }
  
      private static RowDataPacket getRow(long id, String charset) {
          RowDataPacket row = new RowDataPacket(FIELD_COUNT);
          row.add(LongUtil.toBytes(id));
          row.add(LongUtil.toBytes(100L));
          row.add(StringUtil.encode(nf.format(898.9), charset));
          row.add(StringUtil.encode(nf.format(8.8), charset));
          row.add(StringUtil.encode(nf.format(1.0), charset));
          return row;
      }
  
  }
  