content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.cassandra.transport.messages;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import io.netty.buffer.ByteBuf;
  
  import org.apache.cassandra.service.QueryState;
  import org.apache.cassandra.transport.*;
  
  public class RegisterMessage extends Message.Request
  {
      public static final Message.Codec<RegisterMessage> codec = new Message.Codec<RegisterMessage>()
      {
          public RegisterMessage decode(ByteBuf body, ProtocolVersion version)
          {
              int length = body.readUnsignedShort();
              List<Event.Type> eventTypes = new ArrayList<>(length);
              for (int i = 0; i < length; ++i)
                  eventTypes.add(CBUtil.readEnumValue(Event.Type.class, body));
              return new RegisterMessage(eventTypes);
          }
  
          public void encode(RegisterMessage msg, ByteBuf dest, ProtocolVersion version)
          {
              dest.writeShort(msg.eventTypes.size());
              for (Event.Type type : msg.eventTypes)
                  CBUtil.writeEnumValue(type, dest);
          }
  
          public int encodedSize(RegisterMessage msg, ProtocolVersion version)
          {
              int size = 2;
              for (Event.Type type : msg.eventTypes)
                  size += CBUtil.sizeOfEnumValue(type);
              return size;
          }
      };
  
      public final List<Event.Type> eventTypes;
  
      public RegisterMessage(List<Event.Type> eventTypes)
      {
          super(Message.Type.REGISTER);
          this.eventTypes = eventTypes;
      }
  
      @Override
      protected Response execute(QueryState state, Dispatcher.RequestTime requestTime, boolean traceRequest)
      {
          assert connection instanceof ServerConnection;
          Connection.Tracker tracker = connection.getTracker();
          assert tracker instanceof Server.ConnectionTracker;
          for (Event.Type type : eventTypes)
          {
              if (type.minimumVersion.isGreaterThan(connection.getVersion()))
                  throw new ProtocolException("Event " + type.name() + " not valid for protocol version " + connection.getVersion());
              ((Server.ConnectionTracker) tracker).register(type, connection().channel());
          }
          return new ReadyMessage();
      }
  
      @Override
      public String toString()
      {
          return "REGISTER " + eventTypes;
      }
  }
  