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.db;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.cassandra.net.IVerbHandler;
  import org.apache.cassandra.net.Message;
  import org.apache.cassandra.net.MessagingService;
  import org.apache.cassandra.tracing.Tracing;
  
  public class TruncateVerbHandler implements IVerbHandler<TruncateRequest>
  {
      public static final TruncateVerbHandler instance = new TruncateVerbHandler();
  
      private static final Logger logger = LoggerFactory.getLogger(TruncateVerbHandler.class);
  
      public void doVerb(Message<TruncateRequest> message)
      {
          TruncateRequest truncation = message.payload;
          Tracing.trace("Applying truncation of {}.{}", truncation.keyspace, truncation.table);
  
          ColumnFamilyStore cfs = Keyspace.open(truncation.keyspace).getColumnFamilyStore(truncation.table);
          cfs.truncateBlocking();
          Tracing.trace("Enqueuing response to truncate operation to {}", message.from());
  
          TruncateResponse response = new TruncateResponse(truncation.keyspace, truncation.table, true);
          if (logger.isTraceEnabled())
              logger.trace("{} applied.  Enqueuing response to {}@{} ", truncation, message.id(), message.from());
          MessagingService.instance().send(message.responseWith(response), message.from());
      }
  }
  