JDK8 CompletableFuture.supplyAsync how to deal with interruptedException

Question

CompletableFuture.supplyAsync(
() -> {
    transporter.write(req);
    //here take the value from a blocking queue,will throw a interruptedException
    return re         


        

Answer 1

As lambda functions don't support throwing exceptions, I think Java developers will need a new paradigm. One thing that comes to mind is as follows:

public class ResultWrapper {
    E exception;
    R result;
}

Lambda functions can return instances of this wrapper. (Edit: your case)

CompletableFuture> aFuture = ...;
...
aFuture.supplyAsync(
() -> {
    try {
        transporter.write(req);
    } catch(InterruptedException e) {
        ResultWrapper r = new ResultWrapper<>();
        r.exception = e;
        r.result = null;
        return r;
    }
    ...
},  executorService);