001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.pool2.impl;
018
019import java.io.PrintWriter;
020
021/**
022 * CallStack strategy using no-op implementations of all functionality. Can be used by default when abandoned object
023 * logging is disabled.
024 *
025 * @since 2.5
026 */
027public class NoOpCallStack implements CallStack {
028
029    /**
030     * Singleton instance.
031     */
032    public static final CallStack INSTANCE = new NoOpCallStack();
033
034    /**
035     * Constructs the singleton instance.
036     */
037    private NoOpCallStack() {
038    }
039
040    @Override
041    public void clear() {
042        // no-op
043    }
044
045    @Override
046    public void fillInStackTrace() {
047        // no-op
048    }
049
050    @Override
051    public boolean printStackTrace(final PrintWriter writer) {
052        return false;
053    }
054}