<task:annotation-driven executor="executor"

    scheduler="scheduler" />

<task:executor id="executor" pool-size="16-128"

    keep-alive="60" rejection-policy="CALLER_RUNS" queue-capacity="1000" />

@Async()

public Future<Result4Calculate> calculateByLendId(intdid) {

    // 标记1

    // 调用REST服务；监控调用时间。

}

try {

    keplerOverdue = summay4Overdue.get(5, TimeUnit.SECONDS);

    // 后续处理

} catch (Exception e) {

    // 标记2

    // 异常报警

}

/**

 * Executes the given task sometime in the future.  The task

 * may execute in a new thread or in an existing pooled thread.

 *

 * If the task cannot be submitted for execution, either because this

 * executor has been shutdown or because its capacity has been reached,

 * the task is handled by the current {@code RejectedExecutionHandler}.

 *

 * @param command the task to execute

 * @throws RejectedExecutionException at discretion of

 *         {@code RejectedExecutionHandler}, if the task

 *         cannot be accepted for execution

 * @throws NullPointerException if {@code command} is null

 */

public void execute(Runnable command) {

    if (command == null)

        throw new NullPointerException();

    /*

     * Proceed in 3 steps:

     *

     * 1. If fewer than corePoolSize threads are running, try to

     * start a new thread with the given command as its first

     * task.  The call to addWorker atomically checks runState and

     * workerCount, and so prevents false alarms that would add

     * threads when it shouldn‘t, by returning false.

     *

     * 2. If a task can be successfully queued, then we still need

     * to double-check whether we should have added a thread

     * (because existing ones died since last checking) or that

     * the pool shut down since entry into this method. So we

     * recheck state and if necessary roll back the enqueuing if

     * stopped, or start a new thread if there are none.

     *

     * 3. If we cannot queue task, then we try to add a new

     * thread.  If it fails, we know we are shut down or saturated

     * and so reject the task.

     */

    int c = ctl.get();

    if (workerCountOf(c) < corePoolSize) {

        if (addWorker(command, true))

            return;

        c = ctl.get();

    }

    if (isRunning(c) && workQueue.offer(command)) {

        int recheck = ctl.get();

        if (! isRunning(recheck) && remove(command))

            reject(command);

        else if (workerCountOf(recheck) == 0)

            addWorker(null, false);

    }

    else if (!addWorker(command, false))

        reject(command);

}