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How can I execute a task at regular intervals, but in a way so a step can't start until the last one has finished

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1

I have an agent-based model that I need to update every t milliseconds. In each update step, all the agent objects need to be notified and execute some code. I want every step to last t or until the last step has finished, whatever is longer.

How can I do this? I'm trying to use Timer.schedule, but it doesn't seem to be waiting because I'm getting a ConcurrentModificationException.

public void startClock(long delay) 

 Timer timer = new Timer("clock", true);
 TimerTask clockTask = new TimerTask() 

 @Override
 public void run() 
 World.INSTANCE.update(); //this updates all agents
 step++;
 for (Timed task : listeners) 
 task.run();
 
 
 ;
 timer.schedule(clockTask, delay, interval); //miliseconds


public void startClock() 
 startClock(interval);

java concurrency

share|improve this question

edited Mar 23 at 4:10

FailingCoder

321110

asked Mar 23 at 2:46

Pedro VictoriPedro Victori

86

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can't you just have a boolean member variable that you check before executing the code in run()?
  
  – chips
  Mar 23 at 3:05
  

  
  
  
  

add a comment | 

1

I have an agent-based model that I need to update every t milliseconds. In each update step, all the agent objects need to be notified and execute some code. I want every step to last t or until the last step has finished, whatever is longer.

How can I do this? I'm trying to use Timer.schedule, but it doesn't seem to be waiting because I'm getting a ConcurrentModificationException.

public void startClock(long delay) 

 Timer timer = new Timer("clock", true);
 TimerTask clockTask = new TimerTask() 

 @Override
 public void run() 
 World.INSTANCE.update(); //this updates all agents
 step++;
 for (Timed task : listeners) 
 task.run();
 
 
 ;
 timer.schedule(clockTask, delay, interval); //miliseconds


public void startClock() 
 startClock(interval);

java concurrency

share|improve this question

edited Mar 23 at 4:10

FailingCoder

321110

asked Mar 23 at 2:46

Pedro VictoriPedro Victori

86

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can't you just have a boolean member variable that you check before executing the code in run()?
  
  – chips
  Mar 23 at 3:05
  

  
  
  
  

add a comment | 

I have an agent-based model that I need to update every t milliseconds. In each update step, all the agent objects need to be notified and execute some code. I want every step to last t or until the last step has finished, whatever is longer.

How can I do this? I'm trying to use Timer.schedule, but it doesn't seem to be waiting because I'm getting a ConcurrentModificationException.

public void startClock(long delay) 

 Timer timer = new Timer("clock", true);
 TimerTask clockTask = new TimerTask() 

 @Override
 public void run() 
 World.INSTANCE.update(); //this updates all agents
 step++;
 for (Timed task : listeners) 
 task.run();
 
 
 ;
 timer.schedule(clockTask, delay, interval); //miliseconds


public void startClock() 
 startClock(interval);

java concurrency

share|improve this question

edited Mar 23 at 4:10

FailingCoder

321110

asked Mar 23 at 2:46

Pedro VictoriPedro Victori

86

public void startClock(long delay) 

 Timer timer = new Timer("clock", true);
 TimerTask clockTask = new TimerTask() 

 @Override
 public void run() 
 World.INSTANCE.update(); //this updates all agents
 step++;
 for (Timed task : listeners) 
 task.run();
 
 
 ;
 timer.schedule(clockTask, delay, interval); //miliseconds


public void startClock() 
 startClock(interval);

share|improve this question

edited Mar 23 at 4:10

FailingCoder

321110

asked Mar 23 at 2:46

Pedro VictoriPedro Victori

86

share|improve this question

edited Mar 23 at 4:10

FailingCoder

321110

asked Mar 23 at 2:46

Pedro VictoriPedro Victori

86

edited Mar 23 at 4:10

FailingCoder

321110

edited Mar 23 at 4:10

FailingCoder

321110

asked Mar 23 at 2:46

Pedro VictoriPedro Victori

86

asked Mar 23 at 2:46

Pedro VictoriPedro Victori

86

2 Answers
2

active

oldest

votes

0

Take a look at ScheduledExecutorService#scheduleAtFixedRate(). It will execute your task either every t milliseconds or immediately after the last execution if it took longer than t.

share|improve this answer

answered Mar 23 at 8:58

Stefan FerstlStefan Ferstl

4,05131933

add a comment | 

0

You can also evaluate Akka Scheduler. It ensures that there will be no overlap of executions of the runnable. Here's the snippet from their documentation-

If the execution of the runnable takes longer than the interval, the subsequent execution will start immediately after the prior one completes (there will be no overlap of executions of the runnable). In such cases, the actual execution interval will differ from the interval passed.

share|improve this answer

answered Mar 23 at 16:05

DollygDollyg

355

add a comment | 

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0

Take a look at ScheduledExecutorService#scheduleAtFixedRate(). It will execute your task either every t milliseconds or immediately after the last execution if it took longer than t.

share|improve this answer

answered Mar 23 at 8:58

Stefan FerstlStefan Ferstl

4,05131933

add a comment | 

0

Take a look at ScheduledExecutorService#scheduleAtFixedRate(). It will execute your task either every t milliseconds or immediately after the last execution if it took longer than t.

share|improve this answer

answered Mar 23 at 8:58

Stefan FerstlStefan Ferstl

4,05131933

add a comment | 

Take a look at ScheduledExecutorService#scheduleAtFixedRate(). It will execute your task either every t milliseconds or immediately after the last execution if it took longer than t.

share|improve this answer

answered Mar 23 at 8:58

Stefan FerstlStefan Ferstl

4,05131933

share|improve this answer

answered Mar 23 at 8:58

Stefan FerstlStefan Ferstl

4,05131933

answered Mar 23 at 8:58

Stefan FerstlStefan Ferstl

4,05131933

answered Mar 23 at 8:58

Stefan FerstlStefan Ferstl

4,05131933

0

You can also evaluate Akka Scheduler. It ensures that there will be no overlap of executions of the runnable. Here's the snippet from their documentation-

If the execution of the runnable takes longer than the interval, the subsequent execution will start immediately after the prior one completes (there will be no overlap of executions of the runnable). In such cases, the actual execution interval will differ from the interval passed.

share|improve this answer

answered Mar 23 at 16:05

DollygDollyg

355

add a comment | 

0

You can also evaluate Akka Scheduler. It ensures that there will be no overlap of executions of the runnable. Here's the snippet from their documentation-

If the execution of the runnable takes longer than the interval, the subsequent execution will start immediately after the prior one completes (there will be no overlap of executions of the runnable). In such cases, the actual execution interval will differ from the interval passed.

share|improve this answer

answered Mar 23 at 16:05

DollygDollyg

355

add a comment | 

You can also evaluate Akka Scheduler. It ensures that there will be no overlap of executions of the runnable. Here's the snippet from their documentation-

If the execution of the runnable takes longer than the interval, the subsequent execution will start immediately after the prior one completes (there will be no overlap of executions of the runnable). In such cases, the actual execution interval will differ from the interval passed.

share|improve this answer

answered Mar 23 at 16:05

DollygDollyg

355

share|improve this answer

answered Mar 23 at 16:05

DollygDollyg

355

answered Mar 23 at 16:05

DollygDollyg

355

answered Mar 23 at 16:05

DollygDollyg

355