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.core.appender.nosql;
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>
28 * See {@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 }