Closing with CompletionHandler

gistfile1.java

public class SimpleChannelClose_CompletionHandler {
...
	public static void main(String[] args) throws InterruptedException, IOException, ExecutionException {
...
			outputfile.write(ByteBuffer.wrap("Hello".getBytes()), fileindex.getAndIncrement() * 5, "", defaultCompletionHandler);
...
	}

	private static CompletionHandler<Integer, String> defaultCompletionHandler = new CompletionHandler<Integer, String>() {
		@Override
		public void completed(Integer result, String attachment) {
			// NOP
		}

		@Override
		public void failed(Throwable exc, String attachment) {
			System.out.println("Do something to avoid data loss ...");
		}
	};
}