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ExecutorService thread safety


By : rm wu
Date : September 16 2020, 05:00 AM
Hope this helps The important thing is the happens-before relationship. From ExecutorService API docs:
code :


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Thread safety with ExecutorService and CountDownLatch


By : Konrad Mroczek
Date : March 29 2020, 07:55 AM
Any of those help I have cycle, where i download image, I need to load for example 10 images and merge them in one image. In my interest what images will all loaded. This is how i do that. I have executor for limit thread count, and i have CountDownLatch barrier which waiting until all images will be loaded. , Just to flesh out my comment:
code :
CompletionService<Image> service = new ExecutorCompletionService<Image>(
  Executors.newFixedThreadPool(nThreads));
for (Image image : images) {
  service.submit(new ImageRunnable(image), image);
}
try {
  for (int i = 0; i < images.size(); i++) {
    service.take();
  }
} catch (InterruptedException e) {
  // someone wants this thread to cancel peacefully; either exit the thread
  // or at a bare minimum do this to pass the interruption up
  Thread.currentThread().interrupt();
}
URL target = // whatever;
URLConnection connection = target.openConnection();
connection.setReadTimeout(timeoutInMilliseconds);
InputStream stream;
try {
  stream = connection.getInputStream();
  return ImageIO.read(stream);
} finally {
  if (stream != null) { stream.close(); } 
}

How to Stop Or Kill Or Terminate a Single Thread in ExecutorService or Job runs in the Thread?


By : Akshat Solanki
Date : March 29 2020, 07:55 AM
This might help you We also tracked the thread via socket programming.
Assume a call has been initiated from web app to third party application.

Immutable Objects and Initialization Safety with Thread Safety


By : Denis Komnenovic
Date : March 29 2020, 07:55 AM
I hope this helps you . A common mis-understanding is that you have Object fields in Java. You only have references and primitives. This means that
code :
static String lastConstructed;
final Date today = new Date();
volatile Date now = new Date();

now.setTime(System.currentTimeMillis()); // no thread safe.
now = now; // this adds a write barrier.

oracle sequence thread safety can it return CURVAL of its thread when other thread attempts NEXTVAL


By : Mohmmed Yakub pasha
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Yes, but the CURRVAL will be consistent for a given session.
Why don’t you try it and see; you pretty much have s test case written.

Wait main thread until all the thread pools task complete of ExecutorService?


By : user2859519
Date : March 29 2020, 07:55 AM
hop of those help? I need main thread to wait until all the thread pools task complete. How to do it? For eg: I have program: , The method you are looking for exactly is
code :
<T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks)
                          throws InterruptedException
<T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks,
                            long timeout,
                            TimeUnit unit)
                          throws InterruptedException
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