Simple timeout in java

Question

Can anyone guide me on how I can use a simple timeout in java  Basically in my project I m executing a statement br readLine    which is reading a response from a modem  But sometimes the modem isn t responding  For that purpose I want to add a timeout  I m looking for a code like   try       String s  br readLine      catch TimeoutException e        System out println  Time out has occurred

User · Answer

Use this line of code   Thread sleep 1000     It will sleep for 1 second

User · Answer

Nowadays you can use try       String s   CompletableFuture supplyAsync    - gt  br readLine                                     get 1  TimeUnit SECONDS     catch  TimeoutException e        System out println  quot Time out has occurred quot      catch  InterruptedException   ExecutionException e           Handle

User · Answer

Singleton      AccessTimeout value 120000      public class StatusSingletonBean         private String status              Lock LockType WRITE        public void setStatus String new Status            status   newStatus                 Lock LockType WRITE         AccessTimeout value 360000        public void doTediousOperation                                     The following singleton has a default access timeout value of 60 seconds  specified   using the TimeUnit SECONDS constant       Singleton      AccessTimeout value 60  timeUnit SECONDS       public class StatusSingletonBean                             The Java EE 6 Tutorial    https   docs oracle com javaee 6 tutorial doc gipvi html

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The example 1 will not compile   This version of it compiles and runs   It uses lambda features to abbreviate it          RollYourOwnTimeouts java        Summary  How to roll your own timeouts        Copyright   c  2016 Roedy Green  Canadian Mind Products  http   mindprod com       Licence  This software may be copied and used freely for any purpose but military              http   mindprod com contact nonmil html       Requires  JDK 1 8        Created with  JetBrains IntelliJ IDEA IDE http   www jetbrains com idea        Version History      1 0 2016-06-28 initial version     package com mindprod example   import java util concurrent ExecutionException  import java util concurrent ExecutorService  import java util concurrent Executors  import java util concurrent Future  import java util concurrent TimeUnit  import java util concurrent TimeoutException   import static java lang System            How to roll your own timeouts     Based on code at http   stackoverflow com questions 19456313 simple-timeout-in-java        author Roedy Green  Canadian Mind Products     version 1 0 2016-06-28 initial version     since 2016-06-28      public class RollYourOwnTimeout            private static final long MILLIS TO WAIT   10   1000L       public static void main  final String   args                     final ExecutorService executor   Executors newSingleThreadExecutor                schedule the work         final Future lt String gt  future   executor submit  RollYourOwnTimeout  requestDataFromWebsite             try                              where we wait for task to complete             final String result   future get  MILLIS TO WAIT  TimeUnit MILLISECONDS                out println   result      result                           catch   TimeoutException e                             err println   task timed out                 future cancel  true    mayInterruptIfRunning                              catch   InterruptedException e                             err println   task interrupted                            catch   ExecutionException e                             err println   task aborted                            executor shutdownNow                      dummy method to read some data from a website     private static String requestDataFromWebsite             try                      force timeout to expire         Thread sleep  14 000L                  catch   InterruptedException e                           return  dummy

User · Answer

What you are looking for can be found here  It may exist a more elegant way to accomplish that  but one possible approach is  Option 1  preferred    final Duration timeout   Duration ofSeconds 30   ExecutorService executor   Executors newSingleThreadExecutor     final Future lt String gt  handler   executor submit new Callable          Override     public String call   throws Exception           return requestDataFromModem               try       handler get timeout toMillis    TimeUnit MILLISECONDS     catch  TimeoutException e        handler cancel true      executor shutdownNow      Option 2   final Duration timeout   Duration ofSeconds 30   ScheduledExecutorService executor   Executors newScheduledThreadPool 1    final Future lt String gt  handler   executor submit new Callable          Override     public String call   throws Exception           return requestDataFromModem               executor schedule new Runnable          Override     public void run            handler cancel true                  timeout toMillis    TimeUnit MILLISECONDS    executor shutdownNow      Those are only a draft so that you can get the main idea

[java] Simple timeout in java

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