Question

我尝试使用ScheduledExecutorService（在scheduleMatch方法中）安排任务。我看到我的Task类的构造函数被调用，但从不调用Run方法。我也有一个scheduleAtFixedRate，一个工作正常，它每30秒调用一次。请参阅下面的代码，我错过了什么或为什么这段代码不起作用：

MatchTaskScheduler

public class MatchTaskScheduler {

private final ScheduledExecutorService fScheduler;
private final ScheduledExecutorService matchScheduler;
private static final int NUM_THREADS = 1;
private static final int MATCH_SCHEDULER_NUM_THREADS = 10;
private static MatchTaskScheduler taskScheduler;


private MatchTaskScheduler(){       
    fScheduler = Executors.newScheduledThreadPool(NUM_THREADS);   
    matchScheduler = Executors.newScheduledThreadPool(MATCH_SCHEDULER_NUM_THREADS);   
}

public static MatchTaskScheduler getInstance() {
    if(taskScheduler == null) {
        taskScheduler = new MatchTaskScheduler();
    }
    return taskScheduler;
}

public void scheduleMatchScheduler() {
    //This one is working correct
    fScheduler.scheduleAtFixedRate(new ScheduleMatchTask(), 150, 30, TimeUnit.SECONDS);
}

public void scheduleMatch(Match match) {
    Validate.notNull(match, "match of plublic method scheduleMatch shouldn't be null");

    Date scheduledDate = match.getDate();
    Logger.info(this, "Schedule match at: " + scheduledDate);
    if (null == scheduledDate || !scheduledDate.after(new Date())) {
        Logger.error(this, "Match with matchId: " + match.getId() + " isn\'t scheduled because date is in the past");
        return;
    }

    long startTimeInSeconds = (scheduledDate.getTime() / 1000) - (System.currentTimeMillis() / 1000);

    SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
    Logger.info(this, "Current date: " + sdf.format(new Date()));
    Logger.info(this, "Match with matchId: " + match.getId() + " scheduled for: " + sdf.format(scheduledDate));
    try {
        matchScheduler.schedule(new MatchTask(match), startTimeInSeconds, TimeUnit.SECONDS);  
    } catch (RejectedExecutionException e) {
        Logger.error(this, e.toString(), e);
    } catch (NullPointerException e1) {
        Logger.error(this, e1.toString(), e1);
    }
    Logger.info(this, "Match will start in " + startTimeInSeconds + " seconds.");
}
}

MatchTask

public class MatchTask extends TimerTask {

private Match match;

public MatchTask(Match match) {
    Validate.notNull(match, "match of plublic constructor MatchTask shouldn't be null");
    Logger.info(this, "Set match for Runnable + " + match.getId());
    this.match = match;
}

@Override
public void run() {
    System.out.println("Match ID: " + match.getId() + ", current time: " + new Date().getSeconds());
}
}

这是我在日志文件中看到的，在08:33:00，日志文件中没有任何内容。接下来是在8:33:04调用scheduleAtFixedRate时。

[21/10/14 08:32:34:631 CEST]  INFO task.MatchTaskScheduler: Schedule match at: 2014-10-21 08:33:00.0
[21/10/14 08:32:34:631 CEST]  INFO task.MatchTaskScheduler: Current date: 21-10-2014 08:32:34
[21/10/14 08:32:34:632 CEST]  INFO task.MatchTaskScheduler: Match with matchId: 002 scheduled for: 21-10-2014 08:33:00
[21/10/14 08:32:34:632 CEST]  INFO task.MatchTask: Set match for Runnable + 002
[21/10/14 08:32:34:632 CEST]  INFO task.MatchTaskScheduler: Match will start in 26 seconds.

解决了：问题是System.out.println，当我用Logger.info替换它时，它工作正常。

为什么我的ScheduledExecutorService计划无效

0 个答案: