java多线程部分线程串行同时部分线程并行

需求：

     用id来分组，id 相同的分为一组， 同组任务串行执行，不是同组的任务并行。

思路：

   需要并行就要使用多线程，但是同组任务需要串行就需要一把锁。用一个list保存正在执行的id, 执行任务前检查是否有相同的id正在执行任务，如果有就休眠等待，没有就继续执行。任务执行完后从list中移除掉，并且唤醒等待的任务。

代码实现 ：  

    1. 对线程的封装

public class Task implements Runnable {

    private Long taskName;

    private AuthenticTask authenticTask;

    public Task(Long name, AuthenticTask authenticTask) {
        this.taskName = name;
        this.authenticTask = authenticTask;
    }

    @Override
    public void run() {
        List processingTaskNames = ThreadShareData.getProcessingTaskNames();
        try {
            synchronized (taskName){
                //如果任务正在执行等待
                if(processingTaskNames.contains(taskName)){
                    taskName.wait();
                }
                processingTaskNames.add(taskName);
                //开始执行真正的任务
                System.out.println(taskName + "开始执行任务.......");
                authenticTask.process();
                //任务执行完把任务移除
                processingTaskNames.remove(taskName);
                //唤醒等待的任务
                taskName.notify();
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

    2.  辅助类

public interface AuthenticTask {

     void process();
}

public class ThreadShareData {

    private static List ProcessingTaskNames = new CopyOnWriteArrayList();
    private static Map ThreadParamMap = new ConcurrentHashMap<>();


    public static List getProcessingTaskNames() {
        return ProcessingTaskNames;
    }

    public static Map getThreadParamMap() {
        return ThreadParamMap;
    }
}

 3. 测试

public class ThreadTest {

    static ExecutorService pool = Executors.newFixedThreadPool(20);
    public static void main(String[] args) throws InterruptedException {
        run(1L);
        run(2L);
        run(1L);
        run(1L);
        run(1L);
        run(2L);
        run(2L);
        run(1L);
        run(3L);
        run(2L);
        run(3L);

        Thread.sleep(35 * 1000);
        System.out.println(ThreadShareData.getThreadParamMap());
    }

    public static void run(final Long threadName) {
        pool.execute(new Task(threadName, () -> {
            Integer value = (Integer) ThreadShareData.getThreadParamMap().get(threadName);
            if (value == null) {
                value = 0;
            }
            ThreadShareData.getThreadParamMap().put(threadName, value + 1);
        }));
    }
}

 4. 运行结果

2开始执行任务.......
1开始执行任务.......
3开始执行任务.......
2开始执行任务.......
1开始执行任务.......
3开始执行任务.......
1开始执行任务.......
2开始执行任务.......
1开始执行任务.......
2开始执行任务.......
1开始执行任务.......
{1=5, 2=4, 3=2}