ConcurrentLinkedQueue memory leak

[kyrylo.ko...@teamdev.com]

Hello,
I have in sources the code like this one:

public void testQueue() {
Queue<String> q = new ConcurrentLinkedQueue<String> ();
String t;
while (true)
{
t = q.poll();
if (t != null)
{
System.out.print(t);
}
t = null;
}
}

Long term running loop with regular calling ConcurrentLinkedQueue.poll method.

In objective-c this code very fast allocate to much memory, more then 640Mb and iOS closes application. I've found that the similar problem was already fixed https://github.com/google/j2objc/issues/609 . Could some one check this example and tell me if the problem is in my code or this is a j2objc problem. I've tried j2objc-1.0.1 and the latest one 1.1 versions.

Thanks.

[Lukhnos Liu]

You'll need to find a way to drain the autorelease pool every now and then. According to Apple's doc [1]:

If your application or thread is long-lived and potentially generates a lot of autoreleased objects, you should periodically drain and create autorelease pools (like the Application Kit does on the main thread); otherwise, autoreleased objects accumulate and your memory footprint grows.

One possible solution would be to extract the poll-and-consume code:

  while (true) {

     pollAndConsume(q);

  }

And the actual method would be like:

  // import com.google.j2objc.annotations.AutoreleasePool;

  @AutoreleasePool

  public static void pollAndConsume(Queue<String> q) {

    String t = q.poll();

    if (t != null)  {

      System.out.print(t);

    }

  }

[1]: https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSAutoreleasePool_Class/

[kyrylo.ko...@teamdev.com]

Thanks, it's really helped me.