并发元胞自动机执行器移动

Question

我有一个二维细胞自动机。在某些单元中可能有一个参与者(代理)。每个参与者都是一个线程。我需要根据actor的单元格周围的9个单元格移动actor。如果某个演员在他的社区里有这些细胞，他必须等到第一个演员搬家。但我希望允许同时移动没有公共邻域的演员。因此，(4,5)中的参与者可以与(10,5)中的参与者同时移动，因为它们没有共同的邻域。

最好的解决方案是什么？你能提个建议吗？

Answer 1

粗略的想法如下。

创建单元对象矩阵，该矩阵将用于synchronization

• Assign Actor to cells

1. 每当Actor移动到另一个单元时，它必须在cells

上获得监视器

请注意，Actor开始移动的单元格在下面的代码中不受保护。另外，如果填充的每个单元都有一个Actor，您会期望什么？

import java.util.ArrayList;
import java.util.List;

public class CellularAutomata {

    public static void main(String ... args) throws InterruptedException {
        final int rows = 5;
        final int cols = 5;
        Cell[][] matrix = new Cell[rows][cols];
        List<Actor> actors = new ArrayList<>();
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                matrix[i][j] = new Cell();
                //populate actors
                if ((i + j) % 2 == 0) {
                    Actor actor = new Actor(matrix, i, j);
                    actor.setName(String.format("Actor %d %d", i, j));
                    actors.add(actor);
                }
            }
        }
        for (Actor actor : actors) {
            actor.start();
        }
        for (Actor actor : actors) {
            actor.join();
        }
    }

    public static class Cell {}

    public static class Actor extends Thread {

        private final static int[][] circleMoves = {
                {-1, -1}, {-1, 0}, {-1, 1}
                , {0, 1}, {1, 1}, {1, 0}
                , {1, -1}, {0, -1}, {0, 0}
        };
        private final Cell[][] matrix;
        private final int row;
        private final int col;

        public Actor(Cell[][] matrix, int row, int col) {
            this.matrix = matrix;
            this.row = row;
            this.col = col;
        }

        @Override
        public void run() {
            for (int i = 0; i < circleMoves.length; i++) {
                int nextRow = row + circleMoves[i][0];
                int nextCol = col + circleMoves[i][1];
                if (nextRow >= 0 && nextRow < matrix.length
                        && nextCol >= 0 && nextCol < matrix[nextRow].length) {
                    Cell targetCell = matrix[nextRow][nextCol];
                    System.out.println(Thread.currentThread().getName() + " waiting for cell (" + nextRow + ";" + nextCol + ")");
                    synchronized (targetCell) {
                        try {
                            System.out.println(Thread.currentThread().getName() + " moved to cell (" + nextRow + ";" + nextCol + ")");
                            Thread.sleep(1000);
                        } catch (InterruptedException e) {
                            throw new IllegalStateException(e);
                        }
                    }
                }
            }
        }

    }

}