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.util.LinkedList;
  import java.util.List;
  
  import com.alibaba.cobar.CobarServer;
  import com.alibaba.cobar.config.Fields;
  import com.alibaba.cobar.manager.ManagerConnection;
  import com.alibaba.cobar.mysql.PacketUtil;
  import com.alibaba.cobar.net.NIOProcessor;
  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.IntegerUtil;
  import com.alibaba.cobar.util.LongUtil;
  import com.alibaba.cobar.util.NameableExecutor;
  import com.alibaba.cobar.util.StringUtil;
  
  /**
   * 查看线程池状态
   * 
   * @author xianmao.hexm 2010-9-26 下午04:08:39
   * @author wenfeng.cenwf 2011-4-25
   */
  public final class ShowThreadPool {
  
      private static final int FIELD_COUNT = 6;
      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.packetId = ++packetId;
  
          fields[i] = PacketUtil.getField("NAME", Fields.FIELD_TYPE_VAR_STRING);
          fields[i++].packetId = ++packetId;
  
          fields[i] = PacketUtil.getField("POOL_SIZE", Fields.FIELD_TYPE_LONG);
          fields[i++].packetId = ++packetId;
  
          fields[i] = PacketUtil.getField("ACTIVE_COUNT", Fields.FIELD_TYPE_LONG);
          fields[i++].packetId = ++packetId;
  
          fields[i] = PacketUtil.getField("TASK_QUEUE_SIZE", Fields.FIELD_TYPE_LONG);
          fields[i++].packetId = ++packetId;
  
          fields[i] = PacketUtil.getField("COMPLETED_TASK", Fields.FIELD_TYPE_LONGLONG);
          fields[i++].packetId = ++packetId;
  
          fields[i] = PacketUtil.getField("TOTAL_TASK", Fields.FIELD_TYPE_LONGLONG);
          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;
          List<NameableExecutor> executors = getExecutors();
          for (NameableExecutor exec : executors) {
              if (exec != null) {
                  RowDataPacket row = getRow(exec, 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(NameableExecutor exec, String charset) {
          RowDataPacket row = new RowDataPacket(FIELD_COUNT);
          row.add(StringUtil.encode(exec.getName(), charset));
          row.add(IntegerUtil.toBytes(exec.getPoolSize()));
          row.add(IntegerUtil.toBytes(exec.getActiveCount()));
          row.add(IntegerUtil.toBytes(exec.getQueue().size()));
          row.add(LongUtil.toBytes(exec.getCompletedTaskCount()));
          row.add(LongUtil.toBytes(exec.getTaskCount()));
          return row;
      }
  
      private static List<NameableExecutor> getExecutors() {
          List<NameableExecutor> list = new LinkedList<NameableExecutor>();
          CobarServer server = CobarServer.getInstance();
          list.add(server.getInitExecutor());
          list.add(server.getTimerExecutor());
          list.add(server.getManagerExecutor());
          for (NIOProcessor p : server.getProcessors()) {
              list.add(p.getHandler());
              list.add(p.getExecutor());
              list.add(p.getCommitter());
          }
          return list;
      }
  }
  