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1 | !7 |
2 | |
3 | p-experiment { |
4 | allowDeferredComputation(r { |
5 | chainDeferrableComputations(f serveLater, fg(f print, f reversedString)); |
6 | }); |
7 | allowDeferredComputation(r { |
8 | chainDeferrableComputations(f serveNow, fg(f print, f reversedString)); |
9 | }); |
10 | } |
11 | |
12 | sS serveNow() { |
13 | ret "Served now"; |
14 | } |
15 | |
16 | sS serveLater() { |
17 | ret waitThenCompute(1000, func -> S { "Served late" }); |
18 | } |
19 | |
20 | svoid allowDeferredComputation(Runnable r) { |
21 | try { |
22 | callF(r); |
23 | } catch (RuntimeException e) { |
24 | Throwable e2 = innerException(e); |
25 | if (!e2 instanceof DeferredComputationException) throw rethrow(e); |
26 | } |
27 | } |
28 | |
29 | sclass DeferredComputation { |
30 | new Flag done; |
31 | O value; |
32 | Throwable error; |
33 | Runnable continuation, onError; |
34 | |
35 | void setContinuation(Runnable r) { |
36 | synchronized(done) { |
37 | if (!done.isUp()) ret with continuation = r; |
38 | } |
39 | callF(r); |
40 | } |
41 | |
42 | void setValue(O value) { |
43 | synchronized(done) { |
44 | if (done.isUp()) fail("setValue/setError called twice"); |
45 | this.value = value; |
46 | done.raise(); |
47 | } |
48 | callF(continuation); |
49 | } |
50 | |
51 | void setError(Throwable error) { |
52 | synchronized(done) { |
53 | if (done.isUp()) fail("setValue/setError called twice"); |
54 | this.error = error; |
55 | done.raise(); |
56 | } |
57 | if (onError != null) |
58 | callF(onError); |
59 | else |
60 | printStackTrace(error); |
61 | } |
62 | |
63 | O getValue() { |
64 | assertTrue(done.isUp()); |
65 | ret value; |
66 | } |
67 | } |
68 | |
69 | // f1: func -> A, f2 : func(A) -> B, returns: B |
70 | static O chainDeferrableComputations(O f1, fO f2) { |
71 | O result; |
72 | try { |
73 | result = callF(f1); |
74 | } catch (RuntimeException e) { |
75 | Throwable e2 = innerException(e); |
76 | if (!e2 instanceof DeferredComputationException) throw rethrow(e); |
77 | final DeferredComputation f = e2/DeferredComputationException.future; |
78 | |
79 | final new DeferredComputation future2; |
80 | f.setContinuation(r { |
81 | try { |
82 | future2.setValue(callF(f2, f.getValue())); |
83 | } catch e { |
84 | future2.setError(e); |
85 | } |
86 | }); |
87 | throw DeferredComputationException(future2); |
88 | } |
89 | ret callF(f2, result); |
90 | } |
91 | |
92 | static <A> A waitThenCompute(int delay, final F0<A> f) { |
93 | final new DeferredComputation dc; |
94 | doLater(delay, r { |
95 | try { |
96 | dc.setValue(callF(f)); |
97 | } catch e { |
98 | dc.setError(e); |
99 | } |
100 | }); |
101 | throw DeferredComputationException(dc); |
102 | } |
103 | |
104 | sclass DeferredComputationException extends QuickException { |
105 | DeferredComputation future; |
106 | |
107 | *(DeferredComputation *future) {} |
108 | } |
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| Snippet ID: | #1015714 |
| Snippet name: | Deferred Computation Spike |
| Eternal ID of this version: | #1015714/6 |
| Text MD5: | c8c20ef6f574638aa9b9b96105a1882f |
| Transpilation MD5: | 0e8e26dcaee0e7f9bbb56cdae82d5875 |
| Author: | stefan |
| Category: | |
| Type: | JavaX source code (desktop) |
| Public (visible to everyone): | Yes |
| Archived (hidden from active list): | No |
| Created/modified: | 2018-05-24 17:43:02 |
| Source code size: | 2382 bytes / 108 lines |
| Pitched / IR pitched: | No / No |
| Views / Downloads: | 378 / 927 |
| Version history: | 5 change(s) |
| Referenced in: | [show references] |