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.concurrent;
  
  /**
   * A simple abstract implementation of SharedCloseable
   */
  public abstract class SharedCloseableImpl implements SharedCloseable
  {
      final Ref<?> ref;
  
      public SharedCloseableImpl(RefCounted.Tidy tidy)
      {
          ref = new Ref<Object>(null, tidy);
      }
  
      protected SharedCloseableImpl(SharedCloseableImpl copy)
      {
          this.ref = copy.ref.ref();
      }
  
      public boolean isCleanedUp()
      {
          return ref.globalCount() == 0;
      }
  
      public void close()
      {
          ref.ensureReleased();
      }
  
      public Throwable close(Throwable accumulate)
      {
          return ref.ensureReleased(accumulate);
      }
  
      public void addTo(Ref.IdentityCollection identities)
      {
          identities.add(ref);
      }
  }
  