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Datei: LockFreeLogger.java Sprache: JAVA

/*
* Copyright (c) 2014, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

package jdk.test.lib;

import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.stream.Collectors;

/**
* A logger designed specifically to allow collecting ordered log messages
* in a multi-threaded environment without involving any kind of locking.
* <p>
* It is particularly useful in situations when one needs to assert various
* details about the tested thread state or the locks it hold while also wanting
* to produce diagnostic log messages.
*/
public class LockFreeLogger {
    /**
     * ConcurrentLinkedQueue implements non-blocking algorithm.
     */
    private final Queue<String> records = new ConcurrentLinkedQueue<>();

    public LockFreeLogger() {
    }

    /**
     * Logs a message.
     * @param format Message format
     * @param params Message parameters
     */
    public void log(String format, Object ... params) {
        records.add(String.format(format, params));
    }

    /**
     * Generates an aggregated log of chronologically ordered messages.
     *
     * @return An aggregated log of chronologically ordered messages
     */
    @Override
    public String toString() {
        return records.stream().collect(Collectors.joining());
    }
}

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