multithreading - Java, how to make a thread that watches the state of a program? -

multithreading - Java, how to make a thread that watches the state of a program? -

i want create thread running in background checking state of programme runs. want know how maintain running , how create thread.

executors.newsinglethreadexecutor().submit(new applicationmonitor()); class applicationmonitor implements runnable { public void run() { // monitoring stuff } }

applicationmonitor should never homecoming , never allow exceptions thrown. alternately, , maybe more safely, create applicationmonitor 1 check, , set submit() phone call in loop. monitoring can fail, , restarted later:

while (true) { seek { future<?> future = executors.newsinglethreadexecutor().submit( new applicationmonitor()); future.get(); // can add together timeout here limit monitoring thread } grab (exception e) { reportmonitoringexception(e); } sleepuntilnextmonitoringcycle(); }

finally, can have java scheduling you:

scheduledexecutorservice executorservice = executors.newscheduledthreadpool(1); executorservice.schedulewithfixeddelay( new applicationmonitor(), 0, 30, timeunit.minutes);

with approach, can't future scheduled invocations, exceptions have handled within applicationmonitor.

java multithreading state