    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}