创建线程池的一种方式

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创建线程池保证为每个线程指定名称，并对线程池定制异常策略。

    private final String name;
    private final Map<Integer, ExecutorService> executorServiceMap;
    private final int channelCount = 10;
    private final int channelBuffer = 20;
 @Override
    public final void submit(T task) {
        ExecutorService executorService = getExecutorService(task);
        executorService.submit(task);
    }

    private ExecutorService getExecutorService(T task){
        return this.executorServiceMap.computeIfAbsent(getIndex(task.shardingKey()), this::createExecutorService);
    }

    private ExecutorService createExecutorService(Integer index){
        BasicThreadFactory basicThreadFactory = new BasicThreadFactory.Builder()
                .daemon(true)
                .namingPattern(name + "-Task-Executor-Channel-" + index + "-Thread-%d")
                .uncaughtExceptionHandler((t, e) -> LOGGER.error("failed to run task on thread {}.",t, e)).build();

         return new ThreadPoolExecutor(1, 1,
                 0L, TimeUnit.MILLISECONDS,
                 new LinkedBlockingQueue<>(channelBuffer),
                 basicThreadFactory,
                 new ThreadPoolExecutor.CallerRunsPolicy()
                 );
    }

    private Integer getIndex(Long uid){
        return Math.abs(uid.intValue()) % channelCount;
    }