1 | sclass DeferredComputation { |
2 | new Flag done; |
3 | O value; |
4 | Throwable error; |
5 | Runnable continuation, onError; |
6 | |
7 | void setContinuation(Runnable r) { |
8 | synchronized(done) { |
9 | if (!done.isUp()) ret with continuation = r; |
10 | } |
11 | if (error == null) |
12 | callF(r); |
13 | else |
14 | if (onError != null) |
15 | callF(onError); |
16 | else |
17 | printStackTrace(error); |
18 | } |
19 | |
20 | void setValue(O value) { |
21 | synchronized(done) { |
22 | if (done.isUp()) fail("setValue/setError called twice"); |
23 | this.value = value; |
24 | done.raise(); |
25 | } |
26 | callF(continuation); |
27 | } |
28 | |
29 | void setError(Throwable error) { |
30 | synchronized(done) { |
31 | if (done.isUp()) fail("setValue/setError called twice"); |
32 | this.error = error; |
33 | done.raise(); |
34 | } |
35 | if (onError != null) |
36 | callF(onError); |
37 | else |
38 | printStackTrace(error); |
39 | } |
40 | |
41 | O getValue() { |
42 | assertTrue(done.isUp()); |
43 | ret value; |
44 | } |
45 | } |
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| Snippet ID: | #1015716 |
| Snippet name: | DeferredComputation |
| Eternal ID of this version: | #1015716/1 |
| Text MD5: | 729e466ae82b8757a7408509933ceb03 |
| Author: | stefan |
| Category: | |
| Type: | JavaX fragment (include) |
| Public (visible to everyone): | Yes |
| Archived (hidden from active list): | No |
| Created/modified: | 2018-05-24 17:49:27 |
| Source code size: | 906 bytes / 45 lines |
| Pitched / IR pitched: | No / No |
| Views / Downloads: | 350 / 915 |
| Referenced in: | [show references] |