9.4.2. 设定任务计划

Redisson独立节点不要求任务的类在类路径里。他们会自动被Redisson独立节点的ClassLoader加载。因此每次执行一个新任务时，不需要重启Redisson独立节点。

采用Callable任务的范例：

public class CallableTask implements Callable<Long> {
    @RInject
    private RedissonClient redissonClient;
    @Override
    public Long call() throws Exception {
        RMap<String, Integer> map = redissonClient.getMap("myMap");
        Long result = 0;
        for (Integer value : map.values()) {
            result += value;
        }
        return result;
    }
}

在创建ExecutorService时可以配置以下参数：

ExecutorOptions options = ExecutorOptions.defaults()
// 指定重新尝试执行任务的时间间隔。
// ExecutorService的工作节点将等待10分钟后重新尝试执行任务
//
// 设定为0则不进行重试
//
// 默认值为5分钟
options.taskRetryInterval(10, TimeUnit.MINUTES);

RScheduledExecutorService executorService = redisson.getExecutorService("myExecutor");
ScheduledFuture<Long> future = executorService.schedule(new CallableTask(), 10, TimeUnit.MINUTES);
Long result = future.get();

使用Lambda任务的范例：

RExecutorService executorService = redisson.getExecutorService("myExecutor", options);
ScheduledFuture<Long> future = executorService.schedule((Callable & Serializable)() -> {
      System.out.println("task has been executed!");
}, 10, TimeUnit.MINUTES);
Long result = future.get();

采用Runnable任务的范例：

public class RunnableTask implements Runnable {
    @RInject
    private RedissonClient redissonClient;
    private long param;
    public RunnableTask() {
    }
    public RunnableTask(long param) {
        this.param= param;
    }
    @Override
    public void run() {
        RAtomicLong atomic = redissonClient.getAtomicLong("myAtomic");
        atomic.addAndGet(param);
    }
}
RScheduledExecutorService executorService = redisson.getExecutorService("myExecutor");
ScheduledFuture<?> future1 = executorService.schedule(new RunnableTask(123), 10, TimeUnit.HOURS);
// ...
ScheduledFuture<?> future2 = executorService.scheduleAtFixedRate(new RunnableTask(123), 10, 25, TimeUnit.HOURS);
// ...
ScheduledFuture<?> future3 = executorService.scheduleWithFixedDelay(new RunnableTask(123), 5, 10, TimeUnit.HOURS);