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 package org.apache.commons.pool2.impl;
18
19 import java.io.PrintWriter;
20
21 /**
22 * CallStack strategy using no-op implementations of all functionality. Can be used by default when abandoned object
23 * logging is disabled.
24 *
25 * @since 2.5
26 */
27 public class NoOpCallStack implements CallStack {
28
29 /**
30 * Singleton instance.
31 */
32 public static final CallStack INSTANCE = new NoOpCallStack();
33
34 /**
35 * Constructs the singleton instance.
36 */
37 private NoOpCallStack() {
38 }
39
40 @Override
41 public void clear() {
42 // no-op
43 }
44
45 @Override
46 public void fillInStackTrace() {
47 // no-op
48 }
49
50 @Override
51 public boolean printStackTrace(final PrintWriter writer) {
52 return false;
53 }
54 }