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comparison src/fschmidt/util/java/FastFuture.java @ 68:00520880ad02

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add fschmidt source
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 05 Oct 2025 17:24:15 -0600
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67:9d0fefce6985 68:00520880ad02
1 package fschmidt.util.java;
2
3 import java.util.concurrent.Callable;
4 import java.util.concurrent.ExecutionException;
5 import java.util.concurrent.Future;
6 import java.util.concurrent.FutureTask;
7 import java.util.concurrent.TimeUnit;
8
9
10 public final class FastFuture<V> implements Future<V> {
11 private volatile V result;
12 private volatile FutureTask<V> futureTask;
13
14 public FastFuture(Callable<V> callable) {
15 futureTask = new FutureTask<V>(callable);
16 }
17
18 public void run() {
19 FutureTask<V> ft = futureTask;
20 if( ft != null ) {
21 ft.run();
22 }
23 }
24
25 public boolean cancel(boolean mayInterruptIfRunning) {
26 throw new UnsupportedOperationException();
27 }
28
29 public boolean isCancelled() {
30 return false;
31 }
32
33 public boolean isDone() {
34 return futureTask == null;
35 }
36
37 public V get() throws InterruptedException, ExecutionException {
38 FutureTask<V> ft = futureTask;
39 if( ft != null ) {
40 result = ft.get();
41 futureTask = null;
42 }
43 return result;
44 }
45
46 public V get(long timeout,TimeUnit unit) {
47 throw new UnsupportedOperationException();
48 }
49
50 }