Ioanna Katsanou :
I java a java method, which makes a connection to a web service. Sometimes this method takes too long to make the connection. I want for example it it takes longer than 5 seconds, then to stop the current procedure and restart all over for 3 more times. If all times fail, then abort completely.
I have written the following until now:
private ConnectionInterface connectWithTimeout() throws MalformedURLException, Exception {
ExecutorService executor = Executors.newCachedThreadPool();
Callable<Object> task = new Callable<Object>() {
public Object call() throws InterruptedException, MalformedURLException, Exception {
return connectWithNoTimeout(); //This is the method that takes to long. If this method takes more than 5 seconds, I want to cancel and retry for 3 more times. Then abort completely.
}
};
Future<Object> future = executor.submit(task);
try {
Object result = future.get(5, TimeUnit.SECONDS);
} catch (TimeoutException ex) {
System.out.println( "Timeout Occured");
} catch (InterruptedException e) {
System.out.println( " "InterruptedException Occured");
} catch (ExecutionException e) {
System.out.println( ""ExecutionException Occured");
} finally {
future.cancel(true); // here the method gets canceled. How do I retry it?
}
System.out.println( "Connected !!");
return connectWithNoTimeout();
}
private ConnectionInterface connectWithNoTimeout() throws MalformedURLException, Exception {}
Amongalen :
Your method already has a 5 seconds timeout. All you need to do now is to add some kind a loop with 3 repeats. You need a counter of timeouts and a break after successful attempt. Not sure what you want to do when other exceptions happen, added breaks there as well. Following code should do the job:
private ConnectionInterface connectWithTimeout() throws MalformedURLException, Exception {
int repeatCount = 0;
ExecutorService executor = Executors.newCachedThreadPool();
Callable<Object> task = new Callable<Object>() {
public Object call() throws InterruptedException, MalformedURLException, Exception {
return connectWithNoTimeout(); //This is the method that takes to long. If this method takes more than 5 seconds, I want to cancel and retry for 3 more times. Then abort completely.
}
};
while (repeatCount < 3){
Future<Object> future = executor.submit(task);
try {
Object result = future.get(5, TimeUnit.SECONDS);
break;
} catch (TimeoutException ex) {
repeatCount++;
System.out.println( "Timeout Occured");
} catch (InterruptedException e) {
System.out.println( " "InterruptedException Occured");
break;
} catch (ExecutionException e) {
System.out.println( "ExecutionException Occured");
break;
} finally {
future.cancel(true); // here the method gets canceled. How do I retry it?
}
}
System.out.println( "Connected !!");
return connectWithNoTimeout();
}