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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements. See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache license, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License. You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the license for the specific language governing permissions and
15   * limitations under the license.
16   */
17  
18  package org.apache.logging.log4j.nosql.appender;
19  
20  import java.util.concurrent.atomic.AtomicBoolean;
21  
22  /**
23   * Facilitates implementations of {@link NoSqlConnection}.
24   *
25   * @param <W>
26   *            See {@link NoSqlConnection}.
27   * @param <T>See
28   *            {@link NoSqlConnection}.
29   */
30  public abstract class AbstractNoSqlConnection<W, T extends NoSqlObject<W>> implements NoSqlConnection<W, T> {
31  
32      private final AtomicBoolean closed = new AtomicBoolean(false);
33  
34      @Override
35      public void close() {
36          if (this.closed.compareAndSet(false, true)) {
37              closeImpl();
38          }
39      }
40  
41      protected abstract void closeImpl();
42  
43      @Override
44      public boolean isClosed() {
45          return this.closed.get();
46      }
47  
48  }