Timer & TimerTask versus Thread + sleep in Java
I found similar questions asked here but there weren't answers to my satisfaction. So rephrasing the question again-
I have a task that needs to be done on a periodic basis (say 1 minute intervals). What is advantage of using Timertask & Timer to do this as opposed to creating a new thread that has a infinite loop with sleep?
Code snippet using timertask-
TimerTask uploadCheckerTimerTask = new TimerTask(){
public void run() {
NewUploadServer.getInstance().checkAndUploadFiles();
}
};
Timer uploadCheckerTimer = new Timer(true);
uploadCheckerTimer.scheduleAtFixedRate(uploadCheckerTimerTask, 0, 60 * 1000);
Code snippet using Thread and sleep-
Thread t = new Thread(){
public void run() {
while(true) {
NewUploadServer.getInstance().checkAndUploadFiles();
Thread.sleep(60 * 1000);
}
}
};
t.start();
I really don't have to worry if I miss certain cycles if the execution of the logic takes more than the interval time.
Please comment on this..
Thanks,
-Keshav
Update:
Recently I found another difference between using Timer versus Thread.sleep(). Suppose the current system time is 11:00AM. If we rollback the system time to 10:00AM for some reason, The Timer will STOP executing the task until it has reached 11:00AM, whereas Thread.sleep() method would continue executing the task without hindrance. This can be a major decision maker in deciding what to use between these two.
The advantage of TimerTask is that it expresses your intention much better (ie code readability), and it already has the cancel() feature implemented.
Note that it can be written in a shorter form as well as your own example:
Timer uploadCheckerTimer = new Timer(true);
uploadCheckerTimer.scheduleAtFixedRate(
new TimerTask() {
public void run() { NewUploadServer.getInstance().checkAndUploadFiles(); }
}, 0, 60 * 1000);
Timer/TimerTask also takes into account the execution time of your task, so it will be a bit more accurate. And it deals better with multithreading issues (such as avoiding deadlocks etc.). And of course it is usually better to use well-tested standard code instead of some homemade solution.
我不知道为什么，但是我写的一个程序使用了定时器，并且它的堆大小不断增加，一旦我将其更改为线程/睡眠问题解决。
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