Java – Task polling example with Java 8

public void completionService(ExecutorService executor) {
    CompletionService<CustomTaskResult> completionService =
        new ExecutorCompletionService<CustomTaskResult>(executor);

    completionService.submit(() => {
        // to something
    });


    Future<CustomTaskResult> future = null
    while ((future = completionService.poll()) != null) {

    	// do something

    }
}
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