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The core of Neo4j Bolt Protocol, this contains the state machine for Bolt sessions.
There is a newer version: 5.23.0
/*
 * Copyright (c) 2002-2018 "Neo4j,"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.bolt.runtime;

import java.time.Duration;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

import org.neo4j.logging.Log;

import static java.util.concurrent.TimeUnit.MILLISECONDS;

public class CachedThreadPoolExecutorFactory implements ExecutorFactory
{
    public static final int UNBOUNDED_QUEUE = -1;
    public static final int SYNCHRONOUS_QUEUE = 0;

    private final Log log;
    private final RejectedExecutionHandler rejectionHandler;

    public CachedThreadPoolExecutorFactory( Log log )
    {
        this( log, new ThreadPoolExecutor.AbortPolicy() );
    }

    public CachedThreadPoolExecutorFactory( Log log, RejectedExecutionHandler rejectionHandler )
    {
        this.log = log;
        this.rejectionHandler = rejectionHandler;
    }

    @Override
    public ExecutorService create( int corePoolSize, int maxPoolSize, Duration keepAlive, int queueSize, boolean startCoreThreads, ThreadFactory threadFactory )
    {
        ThreadPool result = new ThreadPool( corePoolSize, maxPoolSize, keepAlive, createTaskQueue( queueSize ), threadFactory, rejectionHandler );

        if ( startCoreThreads )
        {
            result.prestartAllCoreThreads();
        }

        return result;
    }

    private static BlockingQueue createTaskQueue( int queueSize )
    {
        if ( queueSize == UNBOUNDED_QUEUE )
        {
            return new LinkedBlockingQueue<>();
        }
        else if ( queueSize == SYNCHRONOUS_QUEUE )
        {
            return new SynchronousQueue<>();
        }
        else if ( queueSize > 0 )
        {
            return new ArrayBlockingQueue<>( queueSize );
        }

        throw new IllegalArgumentException( String.format( "Unsupported queue size %d for thread pool creation.", queueSize ) );
    }

    private class ThreadPool extends ThreadPoolExecutor
    {

        private ThreadPool( int corePoolSize, int maxPoolSize, Duration keepAlive, BlockingQueue workQueue, ThreadFactory threadFactory,
                RejectedExecutionHandler rejectionHandler )
        {
            super( corePoolSize, maxPoolSize, keepAlive.toMillis(), MILLISECONDS, workQueue, threadFactory, rejectionHandler );
        }

    }

}