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The core jetty server artifact.
There is a newer version: 12.1.0.alpha0
//
//  ========================================================================
//  Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.server;

import java.io.IOException;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;

import org.eclipse.jetty.util.BlockingArrayQueue;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;

/**
 * An asynchronously writing RequestLogWriter
 */
public class AsyncRequestLogWriter extends RequestLogWriter
{
    private static final Logger LOG = Log.getLogger(AsyncRequestLogWriter.class);
    private final BlockingQueue _queue;
    private transient AsyncRequestLogWriter.WriterThread _thread;
    private boolean _warnedFull;

    public AsyncRequestLogWriter()
    {
        this(null, null);
    }

    public AsyncRequestLogWriter(String filename)
    {
        this(filename, null);
    }

    public AsyncRequestLogWriter(String filename, BlockingQueue queue)
    {
        super(filename);
        if (queue == null)
            queue = new BlockingArrayQueue<>(1024);
        _queue = queue;
    }

    private class WriterThread extends Thread
    {
        WriterThread()
        {
            setName("AsyncRequestLogWriter@" + Integer.toString(AsyncRequestLogWriter.this.hashCode(), 16));
        }

        @Override
        public void run()
        {
            while (isRunning())
            {
                try
                {
                    String log = _queue.poll(10, TimeUnit.SECONDS);
                    if (log != null)
                        AsyncRequestLogWriter.super.write(log);

                    while (!_queue.isEmpty())
                    {
                        log = _queue.poll();
                        if (log != null)
                            AsyncRequestLogWriter.super.write(log);
                    }
                }
                catch (InterruptedException e)
                {
                    LOG.ignore(e);
                }
                catch (Throwable t)
                {
                    LOG.warn(t);
                }
            }
        }
    }

    @Override
    protected synchronized void doStart() throws Exception
    {
        super.doStart();
        _thread = new AsyncRequestLogWriter.WriterThread();
        _thread.start();
    }

    @Override
    protected void doStop() throws Exception
    {
        _thread.interrupt();
        _thread.join();
        super.doStop();
        _thread = null;
    }

    @Override
    public void write(String log) throws IOException
    {
        if (!_queue.offer(log))
        {
            if (_warnedFull)
                LOG.warn("Log Queue overflow");
            _warnedFull = true;
        }
    }
}