Java计时器问题可能涉及将它们存储在列表中
因此,我将尽可能全面地讨论我的计划的具体内容,同时也要让大家了解我的主要观点。我有两个重要的目标,工作经理和工作人员。JobWorker有一个任务,它应该以固定的时间间隔执行,直到完成为止。我将忽略工作完成后发生的事情,因为它们永远不会开始。我看到JobManager的计时器正在启动,但JobWorker计时器没有启动。下面是一些伪代码,可以帮助您了解情况Java计时器问题可能涉及将它们存储在列表中,java,multithreading,list,memory-management,Java,Multithreading,List,Memory Management,因此,我将尽可能全面地讨论我的计划的具体内容,同时也要让大家了解我的主要观点。我有两个重要的目标,工作经理和工作人员。JobWorker有一个任务,它应该以固定的时间间隔执行,直到完成为止。我将忽略工作完成后发生的事情,因为它们永远不会开始。我看到JobManager的计时器正在启动,但JobWorker计时器没有启动。下面是一些伪代码,可以帮助您了解情况 public class JobWorker { private String jobName; private Timer
public class JobWorker
{
private String jobName;
private Timer timer;
private Calendar startTime;
public JobWorker(String jobName, Calendar startTime, otherFields)
{
this.jobName = jobName;
this.startTime = startTime;
this.timer = new Timer("EmailJob" + jobName + "-timer");
//set other fields
}
public void start()
{
timer.schedule(new TimerTask(){
public void run()
{
//Do stuff - this is where nothing is happening
}
}, 0, 60000);
}
//Equals method and other stuff
}
public class JobManager
{
private List<JobWorker> activeWorkers = new ArrayList<JobWorker>();
private List<JobWorker> pausedWorkers = new ArrayList<JobWorker>();
private Timer timer;
public JobManager()
{
//loads workers from database
timer = new Timer("JobManager-timer");
loadJobs();
timer.schedule(new TimerTask(){
public void run()
{
//I see this statement every minute as expected
logger.info("EmailJobManager timer run started.");
for(JobWorker worker : pausedWorkers)
{
Calendar c = new GregorianCalendar();
//I can see worker.getStartTime() in client gui so I know that they have already passed
if(c.compareTo(worker.getStartTime()) > 0)
{
//Never see these log statements
logger.info("Memory Address in manager timer loop 2 for " + worker.getEmailJobName() + " ({})", worker.toString());
SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yy - HH:mm");
logger.info("Comparing current time ({}) to JobWorker " + worker.getJobName() + " start time ({})", sdf.format(c.getTime()), sdf.format(worker.getStartDate()));
activeWorkers.add(worker);
pausedWorkers.remove(worker);
worker.start();
}
}
}
}, 0, 60000);
}
public void addWorker(necessary fields)
{
//Create JobWorker newWorker = new JobWorker(jobName, blah blah)
pausedWorkers.add(newWorker);
}
/**
* Checks to see if any jobs were not completed as expected due to hardware error. Recreates the EmailJob and EmailJobWorker responsible.
*/
private void loadJobs()
{
String SQL = "SELECT * FROM email_jobs";
List<Map<String, Object>> rows = jt.queryForList(SQL);
for(Map<String, Object> row : rows)
{
JobWorker worker = new JobWorker(stuff it needs from SQL);
//I see these debug statements
logger.info("Worker " + worker.getJobName() + " has been added to pausedWorkers list with memory address ({})", worker.toString());
pausedWorkers.add(worker);
logger.info("Job " + jobName + " loaded sucessfully.");
}
}
正如您所看到的,计时器甚至不是每分钟都会响,尽管EmailJobManager只创建了一次,而JobWorkers的计时器也从未被触发
我看到JobManager的计时器正在启动,但是JobWorker
计时器没有启动
您正在呼叫作业工人。启动吗?您需要包含更多的代码,以便我们可以看到发生了什么。没有理由不执行那些run
方法:
暂时性只与序列化相关。因此它最终成为timertasks运行方法中的错误。因为它们是匿名的,所以这些错误确实会导致主方法中断,并以静默方式失败。我发布了更多的代码,以便更多地了解发生了什么,但是如果你们说这与我如何将它们存储在列表中无关,那么这一定是我的逻辑错误。结果是run方法中的错误没有被正确记录。你完全正确,这个想法背后没有任何错误。如果你没有看到那些日志行,那么我看不出是什么让你得出结论,你的问题与涉及
compareTo
的条件无关。我会研究它,正如我说的,我可以看到我的客户端gui中的开始时间,但是可能有一些奇怪的地方。将compareTo
的返回值保存在本地变量中,并在测试之前打印出来。我发布了实际的类,因为我无法理解日志语句告诉我的内容与if语句等中的逻辑有关。看。为什么不把final int cmp=c.compareTo(worker.getEmailJob().getStartTime())写下来;logger.info(“比较结果:+cmp”);如果(cmp>0){…
2012-04-17 16:34:18,548 INFO [http-bio-8081-exec-97] c.c.e.EmailJobWorker [EmailJobWorker.java:98] EmailJobWorker test was created sucessfully. (batchSize, timeInterval, currentId, startTime) (1, 5, 1, 04/17/12 - 15:15)
2012-04-17 16:34:18,552 INFO [http-bio-8081-exec-97] c.c.e.EmailJobManager [EmailJobManager.java:297] Worker test has been added to pausedWorkers list with memory address (EmailJobWorker@7e7df7d)
2012-04-17 16:34:18,552 INFO [http-bio-8081-exec-97] c.c.e.EmailJobManager [EmailJobManager.java:301] EmailJob test loaded sucessfully.
2012-04-17 16:34:18,557 INFO [http-bio-8081-exec-97] c.c.e.EmailJobWorker [EmailJobWorker.java:98] EmailJobWorker test2 was created sucessfully. (batchSize, timeInterval, currentId, startTime) (1, 5, 1, 04/17/12 - 15:15)
2012-04-17 16:34:18,558 INFO [http-bio-8081-exec-97] c.c.e.EmailJobManager [EmailJobManager.java:297] Worker test2 has been added to pausedWorkers list with memory address (EmailJobWorker@349be26c)
2012-04-17 16:34:18,558 INFO [http-bio-8081-exec-97] c.c.e.EmailJobManager [EmailJobManager.java:301] EmailJob test2 loaded sucessfully.
2012-04-17 16:34:18,558 INFO [http-bio-8081-exec-97] c.c.e.EmailJobManager [EmailJobManager.java:117] EmailJobManager timer started sucesfully. (sleepTime) (1)
2012-04-17 16:34:18,559 INFO [EmailJobManager] c.c.e.EmailJobManager [EmailJobManager.java:74] EmailJobManager timer run started.
2012-04-17 16:34:18,561 INFO [EmailJobManager] c.c.e.EmailJobManager [EmailJobManager.java:85] Size of pausedWorkers: 2
2012-04-17 16:34:18,561 INFO [EmailJobManager] c.c.e.EmailJobManager [EmailJobManager.java:89] Memory Address in manager timer loop 2 for test (EmailJobWorker@7e7df7d)
2012-04-17 16:34:19,501 INFO [EmailJobManager] c.c.e.EmailJobManager [EmailJobManager.java:75] EmailJobManager timer run started.
2012-04-17 16:34:31,984 INFO [EmailJobManager] c.c.e.EmailJobManager [EmailJobManager.java:75] EmailJobManager timer run started.
2012-04-17 16:34:34,562 INFO [EmailJobManager] c.c.e.EmailJobManager [EmailJobManager.java:75] EmailJobManager timer run started.
2012-04-17 16:35:04,840 INFO [EmailJobManager] c.c.e.EmailJobManager [EmailJobManager.java:75] EmailJobManager timer run started.
2012-04-17 16:35:19,501 INFO [EmailJobManager] c.c.e.EmailJobManager [EmailJobManager.java:75] EmailJobManager timer run started.
2012-04-17 16:35:31,984 INFO [EmailJobManager] c.c.e.EmailJobManager [EmailJobManager.java:75] EmailJobManager timer run started.
2012-04-17 16:35:34,562 INFO [EmailJobManager] c.c.e.EmailJobManager [EmailJobManager.java:75] EmailJobManager timer run started.
2012-04-17 16:36:04,840 INFO [EmailJobManager] c.c.e.EmailJobManager