How to stop execution after a certain time in Java

Question

In the code  the variable timer would specify the duration after which to end the while loop  60 sec for example      while timer          run       terminate after 60 sec

User · Answer

Depends on what the while loop is doing   If there is a chance that it will block for a long time  use TimerTask to schedule a task to set a stopExecution flag  and also  interrupt   your thread   With just a time condition in the loop  it could sit there forever waiting for input or a lock  then again  may not be a problem for you

User · Answer

long start   System currentTimeMillis    long end   start   60 1000     60 seconds   1000 ms sec while  System currentTimeMillis    lt  end           run

User · Answer

If you can t go over your time limit  it s a hard limit  then a thread is your best bet  You can use a loop to terminate the thread once you get to the time threshold  Whatever is going on in that thread at the time can be interrupted  allowing calculations to stop almost instantly  Here is an example   Thread t   new Thread myRunnable      myRunnable does your calculations  long startTime   System currentTimeMillis    long endTime   startTime   60000L   t start       Kick off calculations  while  System currentTimeMillis    lt  endTime           Still within time theshold  wait a little longer     try            Thread sleep 500L       Sleep 1 2 second       catch  InterruptedException e                Someone woke us up during sleep  that s OK          t interrupt        Tell the thread to stop t join             Wait for the thread to cleanup and finish   That will give you resolution to about 1 2 second  By polling more often in the while loop  you can get that down   Your runnable s run would look something like this   public void run         while  true            try                  Long running work             calculateMassOfUniverse              catch  InterruptedException e                   We were signaled  clean things up             cleanupStuff                break               Leave the loop  thread will exit           Update based on Dmitri s answer  Dmitri pointed out TimerTask  which would let you avoid the loop  You could just do the join call and the TimerTask you setup would take care of interrupting the thread  This would let you get more exact resolution without having to poll in a loop

User · Answer

you should try the new Java Executor Services  http   docs oracle com javase 6 docs api java util concurrent ExecutorService html  With this you don t need to program the loop the time measuring by yourself   public class Starter        public static void main final String   args            final ExecutorService service   Executors newSingleThreadExecutor             try               final Future lt Object gt  f   service submit    - gt                       Do you long running calculation here                 Thread sleep 1337      Simulate some delay                 return  42                                System out println f get 1  TimeUnit SECONDS              catch  final TimeoutException e                System err println  Calculation took to long              catch  final Exception e                throw new RuntimeException e             finally               service shutdown

[java] How to stop execution after a certain time in Java?

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