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.utils.progress;
  
  import java.util.List;
  import java.util.concurrent.CopyOnWriteArrayList;
  
  /**
   * Provides basic, thread safe ProgressEvent notification support
   */
  public abstract class ProgressEventNotifierSupport implements ProgressEventNotifier
  {
      private List<ProgressListener> listeners = new CopyOnWriteArrayList<>();
  
      @Override
      public void addProgressListener(ProgressListener listener)
      {
          listeners.add(listener);
      }
  
      @Override
      public void removeProgressListener(ProgressListener listener)
      {
          listeners.remove(listener);
      }
  
      protected void fireProgressEvent(String tag, ProgressEvent event)
      {
          for (ProgressListener listener : listeners)
          {
              listener.progress(tag, event);
          }
      }
  }
  