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.service;
  
  import java.util.stream.Collectors;
  
  import com.google.common.collect.ImmutableSet;
  
  import org.apache.cassandra.io.sstable.format.Version;
  import org.apache.cassandra.notifications.INotification;
  
  /**
   * Notification triggered by a {@link SSTablesGlobalTracker} when the set of sstables versions in use on this node
   * changes.
   *
   * <p>The notification includes the set of sstable versions in use when the notification is triggered (so the result
   * of the change triggering that notification).
   */
  public class SSTablesVersionsInUseChangeNotification implements INotification
  {
      /**
       * The set of all sstable versions in use on this node at the time of this notification.
       */
      public final ImmutableSet<Version> versionsInUse;
  
      SSTablesVersionsInUseChangeNotification(ImmutableSet<Version> versionsInUse)
      {
          this.versionsInUse = versionsInUse;
      }
  
      @Override
      public String toString()
      {
          return String.format("SSTablesInUseChangeNotification(%s)", versionsInUse.stream().map(Version::toFormatAndVersionString).collect(Collectors.toList()));
      }
  }
  