Java Code Examples for scala.concurrent.Future#onComplete()

/**
 * Converts a Scala {@link Future} to a {@link CompletableFuture}.
 *
 * @param scalaFuture to convert to a Java 8 CompletableFuture
 * @param <T> type of the future value
 * @param <U> type of the original future
 * @return Java 8 CompletableFuture
 */
public static <T, U extends T> CompletableFuture<T> toJava(Future<U> scalaFuture) {
	final CompletableFuture<T> result = new CompletableFuture<>();

	scalaFuture.onComplete(new OnComplete<U>() {
		@Override
		public void onComplete(Throwable failure, U success) {
			if (failure != null) {
				result.completeExceptionally(failure);
			} else {
				result.complete(success);
			}
		}
	}, Executors.directExecutionContext());

	return result;
}
 

/**
 * Converts a Scala {@link Future} to a {@link CompletableFuture}.
 *
 * @param scalaFuture to convert to a Java 8 CompletableFuture
 * @param <T> type of the future value
 * @param <U> type of the original future
 * @return Java 8 CompletableFuture
 */
public static <T, U extends T> CompletableFuture<T> toJava(Future<U> scalaFuture) {
	final CompletableFuture<T> result = new CompletableFuture<>();

	scalaFuture.onComplete(new OnComplete<U>() {
		@Override
		public void onComplete(Throwable failure, U success) {
			if (failure != null) {
				result.completeExceptionally(failure);
			} else {
				result.complete(success);
			}
		}
	}, Executors.directExecutionContext());

	return result;
}
 

@Test
public void testExecutor() {
    ActorRef server = system.actorOf(ServerActor.props());
    Timeout t = new Timeout(Duration.create(3, TimeUnit.SECONDS));
    //使用ask发送消息,actor处理完，必须有返回（超时时间5秒）
    try {
        Future<Object> ask = Patterns.ask(server, "123", t);
        ask.onComplete(new OnComplete<Object>() {
            @Override
            public void onComplete(Throwable throwable, Object o) throws Throwable {
                if (throwable != null) {
                    System.out.println("some thing wrong.{}" + throwable);
                } else {
                    System.out.println("success:" + o);
                }
            }
        }, system.dispatcher());
        System.out.println("执行完毕");
    } catch (Exception e) {
        e.printStackTrace();
    }
}
 

/**
 * Converts a Scala {@link Future} to a {@link CompletableFuture}.
 *
 * @param scalaFuture to convert to a Java 8 CompletableFuture
 * @param <T> type of the future value
 * @param <U> type of the original future
 * @return Java 8 CompletableFuture
 */
public static <T, U extends T> CompletableFuture<T> toJava(Future<U> scalaFuture) {
	final CompletableFuture<T> result = new CompletableFuture<>();

	scalaFuture.onComplete(new OnComplete<U>() {
		@Override
		public void onComplete(Throwable failure, U success) {
			if (failure != null) {
				result.completeExceptionally(failure);
			} else {
				result.complete(success);
			}
		}
	}, Executors.directExecutionContext());

	return result;
}
 

/**
 * 调取简单任务
 *
 * @param job
 * @param nickleSchedulerExecutorJobs
 */
public static void scheduleSimpleJob(NickleSchedulerJob job,
                                     List<NickleSchedulerExecutorJob> nickleSchedulerExecutorJobs,
                                     SqlSessionFactory sqlSessionFactory, ActorContext actorContext) {
    SqlSession sqlSession = sqlSessionFactory.openSession();
    NickleSchedulerExecutorMapper executorMapper = sqlSession.getMapper(NickleSchedulerExecutorMapper.class);
    NickleSchedulerRunJobMapper runJobMapper = sqlSession.getMapper(NickleSchedulerRunJobMapper.class);
    try {
        //简单任务目前采用轮询算法来保证任务高可用
        /**
         * @// TODO: 2019/5/12  应修改为随机散列提高性能
         */
        for (NickleSchedulerExecutorJob executorJob : nickleSchedulerExecutorJobs) {
            //获取到执行器ip和端口
            QueryWrapper<NickleSchedulerExecutor> schedulerExecutorQueryWrapper = new QueryWrapper<>();
            schedulerExecutorQueryWrapper.lambda().eq(NickleSchedulerExecutor::getExecutorName, executorJob.getExecutorName());
            NickleSchedulerExecutor nickleSchedulerExecutor = executorMapper.selectOne(schedulerExecutorQueryWrapper);
            if (nickleSchedulerExecutor == null) {
                log.error("关联表有执行器，但是执行器表没有对应执行器数据");
                continue;
            }
            //插入正在巡行列表
            NickleSchedulerRunJob nickleSchedulerRunJob = insertRunJob(sqlSession, nickleSchedulerExecutor.getExecutorId(), job);
            //拼接获取远程actor发送信息
            String executorDispatcherPath = String.format(AKKA_REMOTE_MODEL
                    , EXECUTOR_SYSTEM_NAME
                    , nickleSchedulerExecutor.getExecutorIp()
                    , nickleSchedulerExecutor.getExecutorPort()
                    , EXECUTOR_DISPATCHER_NAME);
            ActorSelection actorSelection = actorContext.actorSelection(executorDispatcherPath);
            ExecuteJobEvent executorStartEvent = new ExecuteJobEvent(job.getJobClassName(), nickleSchedulerRunJob.getId());
            log.info("开始调度简单job：{},目标主机路径：{}", job, executorDispatcherPath);
            log.info("executorStartEvent：{}", executorStartEvent);
            //需确保DispacherActor真实收到任务所以采用ask模式,超时时间设置500ms
            Timeout t = new Timeout(Duration.create(500, TimeUnit.MILLISECONDS));
            CountDownLatch countDownLatch = new CountDownLatch(1);
            Future<Object> ask = Patterns.ask(actorSelection, executorStartEvent, t);
            boolean[] registerSuccess = new boolean[1];
            registerSuccess[0] = false;
            ask.onComplete(new OnComplete<Object>() {
                @Override
                public void onComplete(Throwable throwable, Object o) throws Throwable {
                    if (throwable != null) {
                        log.error("执行器:{}连接超时,即将删除", nickleSchedulerExecutor);
                        //删除执行器
                        deleteExecutor(sqlSession, nickleSchedulerExecutor);
                        log.error("执行器:{}删除成功", nickleSchedulerExecutor);
                    } else {
                        registerSuccess[0] = true;
                    }
                    countDownLatch.countDown();
                }
            }, actorContext.dispatcher());
            //等待任务注册完毕
            try {
                countDownLatch.await();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            if (registerSuccess[0]) {
                log.info("job:{}调度成功", job);
                sqlSession.commit();
                return;
            } else {
                runJobMapper.deleteById(nickleSchedulerRunJob.getId());
                log.info("job:{}调度失败，执行器为：{}", job, nickleSchedulerExecutor);
            }
        }
        //执行到这里证明所有执行器都无法连接，将会把任务失败
        insertFailJob(job, NO_EXECUTOR, EXECUTOR_NOT_CONNECTED, sqlSession);
        sqlSession.commit();
    } finally {
        sqlSession.close();
    }
}