it.tidalwave.actor.impl.ExecutorWithPriority Maven / Gradle / Ivy

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An experimental module which provides an implementation of an actor-based framework.
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/*
 * *************************************************************************************************************************************************************
 *
 * TheseFoolishThings: Miscellaneous utilities
 * http://tidalwave.it/projects/thesefoolishthings
 *
 * Copyright (C) 2009 - 2025 by Tidalwave s.a.s. (http://tidalwave.it)
 *
 * *************************************************************************************************************************************************************
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, either express or implied.  See the License for the specific language governing permissions and limitations under the License.
 *
 * *************************************************************************************************************************************************************
 *
 * git clone https://bitbucket.org/tidalwave/thesefoolishthings-src
 * git clone https://github.com/tidalwave-it/thesefoolishthings-src
 *
 * *************************************************************************************************************************************************************
 */
package it.tidalwave.actor.impl;

// import javax.annotation.Nonnegative;
import jakarta.annotation.Nonnull;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Executor;
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import lombok.extern.slf4j.Slf4j;

/***************************************************************************************************************************************************************
 *
 * An executor that propagates the {@link it.tidalwave.actor.Collaboration}.
 *
 * @author  Fabrizio Giudici
 *
 **************************************************************************************************************************************************************/
@Slf4j
public class ExecutorWithPriority
  {
    private final Runnable consumer = new Runnable()
      {
        @Override
        public void run()
          {
            for (;;)
              {
                final var runnable = runnableQueue.poll();

                if (runnable == null)
                  {
                    break;
                  }

                runnable.run();
              }
          }
      };

    private static interface PriorityRunnable extends Runnable
      {
      }

    private final BlockingQueue runnableQueue = new LinkedBlockingDeque<>()
      {
        @Override
        public boolean add (@Nonnull final Runnable runnable)
          {
            if (runnable instanceof PriorityRunnable)
              {
                addFirst(runnable);
              }
            else
              {
                addLast(runnable);
              }

            return true;
          }
      };

    private final Executor executor;

    /***********************************************************************************************************************************************************
     * Creates an executor with the given pool size.
     *
     * @param  poolSize          the pool size
     * @param  name              the thread base name
     * @param  initialPriority   the initial thread priority in this executor
     **********************************************************************************************************************************************************/
    public ExecutorWithPriority (/* @Nonnegative */ final int poolSize,
                                 @Nonnull final String name,
                                 /* @Nonnegative */ final int initialPriority)
      {
        final var threadFactory = new ThreadFactory()
          {
            private int count = 0;

            @Override @Nonnull
            public Thread newThread (@Nonnull final Runnable runnable)
              {
                final var thread = new Thread(runnable, name + "-" + count++);
                thread.setPriority(initialPriority);
                return thread;
              }
          };

        // first parameter should be 0, but in this case it goes single thread
        executor = new ThreadPoolExecutor(poolSize, poolSize, 2, TimeUnit.SECONDS,
                                          new LinkedBlockingQueue<>(), threadFactory);
//        executor = new ThreadPoolExecutor(poolSize, poolSize, 2, TimeUnit.SECONDS, runnableQueue, threadFactory);
      }

    /***********************************************************************************************************************************************************
     * Schedules the execution of a worker at the end of the queue.
     *
     * @param  worker  the worker
     **********************************************************************************************************************************************************/
    public void execute (@Nonnull final Runnable worker)
      {
        runnableQueue.add(worker);
        executor.execute(consumer);
//        executor.execute(worker);
      }

    /***********************************************************************************************************************************************************
     * Schedules the execution of a worker as soon as possible.
     *
     * @param  worker  the worker
     **********************************************************************************************************************************************************/
    public void executeWithPriority (@Nonnull final Runnable worker)
      {
//        executor.execute(new PriorityRunnable()
        runnableQueue.add((PriorityRunnable)worker::run);
        executor.execute(consumer);
      }
  }