tl;dr Any exception escaping your run method halts all further work, without notice. Always use a try-catch within your run method. Try to recover if you want scheduled activity to continue. @Override public void run () { try { doChore(); } catch ( Exception e ) { logger.error( “Caught exception in ScheduledExecutorService. StackTrace:\n” + t.getStackTrace() … Read more
Answer Modify your Tuesday cron logic to execute every other week since the epoch. Knowing that there are 604800 seconds in a week (ignoring DST changes and leap seconds, thank you), and using GNU date: 0 6 * * Tue expr `date +\%s` / 604800 \% 2 >/dev/null || /scripts/fortnightly.sh Aside Calendar arithmetic is frustrating. … Read more
As documented in /usr/src/linux/Documentation/block/switching-sched.txt, the I/O scheduler on any particular block device can be changed at runtime. There may be some latency as the previous scheduler’s requests are all flushed before bringing the new scheduler into use, but it can be changed without problems even while the device is under heavy use. # cat /sys/block/hda/queue/scheduler … Read more
I wouldn’t use Thread.Sleep(). Either use a scheduled task (as others have mentioned), or set up a timer inside your service, which fires periodically (every 10 minutes for example) and check if the date changed since the last run: private Timer _timer; private DateTime _lastRun = DateTime.Now.AddDays(-1); protected override void OnStart(string[] args) { _timer = … Read more
Spring v3.2.2 has added String parameters to the original 3 long parameters to handle this. fixedDelayString, fixedRateString and initialDelayString are now available too. @Scheduled(fixedDelayString = “${my.fixed.delay.prop}”) public void readLog() { … }
node-cron does just what I described
An uninterruptible process is a process which happens to be in a system call (kernel function) that cannot be interrupted by a signal. To understand what that means, you need to understand the concept of an interruptible system call. The classic example is read(). This is a system call that can take a long time … Read more
For the original question, asking about Windows XP (and Windows 7): Windows Task Scheduler For command-line usage, you can schedule with the AT command. For newer Microsoft OS versions, Windows Server 2012 / Windows 8, look at the schtasks command line utility. If using PowerShell, the Scheduled Tasks Cmdlets in Windows PowerShell are made for … Read more
According to Java Concurrency in Practice: Timer can be sensitive to changes in the system clock, ScheduledThreadPoolExecutor isn’t. Timer has only one execution thread, so long-running task can delay other tasks. ScheduledThreadPoolExecutor can be configured with any number of threads. Furthermore, you have full control over created threads, if you want (by providing ThreadFactory). Runtime … Read more