/*
    * Copyright 2020 LINE Corporation
    *
    * LINE Corporation 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:
    *
    *   https://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.linecorp.centraldogma.server.internal.replication;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.concurrent.Executor;
  
  import org.apache.curator.framework.recipes.shared.SharedCountListener;
  import org.apache.curator.framework.recipes.shared.SharedCountReader;
  import org.apache.curator.framework.recipes.shared.VersionedValue;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  final class SettableSharedCount implements SharedCountReader {
  
      private static final Logger logger = LoggerFactory.getLogger(SettableSharedCount.class);
  
      private final List<SharedCountListener> listeners;
      private int count;
  
      SettableSharedCount(int count) {
          this.count = count;
          listeners = new ArrayList<>();
      }
  
      void setCount(int count) {
          this.count = count;
          for (SharedCountListener listener : listeners) {
              try {
                  listener.countHasChanged(this, count);
              } catch (Exception e) {
                  logger.warn("Unexpected exception caught while notifying {}", listener, e);
              }
          }
      }
  
      @Override
      public int getCount() {
          return count;
      }
  
      @Override
      public VersionedValue<Integer> getVersionedValue() {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public void addListener(SharedCountListener listener) {
          listeners.add(listener);
      }
  
      @Override
      public void addListener(SharedCountListener listener, Executor executor) {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public void removeListener(SharedCountListener listener) {
          throw new UnsupportedOperationException();
      }
  }