1 |
/* |
2 |
* Written by Doug Lea with assistance from members of JCP JSR-166 |
3 |
* Expert Group and released to the public domain, as explained at |
4 |
* http://creativecommons.org/publicdomain/zero/1.0/ |
5 |
*/ |
6 |
|
7 |
import java.util.*; |
8 |
import java.util.concurrent.*; |
9 |
|
10 |
/** |
11 |
* One FJ publisher, many subscribers |
12 |
*/ |
13 |
public class SubmissionPublisherLoops2 { |
14 |
static final int ITEMS = 1 << 20; |
15 |
static final int CONSUMERS = 64; |
16 |
static final int CAP = Flow.defaultBufferSize(); |
17 |
static final int REPS = 9; |
18 |
|
19 |
static final Phaser phaser = new Phaser(CONSUMERS + 1); |
20 |
|
21 |
static final class Sub implements Flow.Subscriber<Boolean> { |
22 |
Flow.Subscription sn; |
23 |
int count; |
24 |
public void onSubscribe(Flow.Subscription s) { |
25 |
(sn = s).request(CAP); |
26 |
} |
27 |
public void onNext(Boolean t) { |
28 |
if ((++count & (CAP - 1)) == (CAP >>> 1)) |
29 |
sn.request(CAP); |
30 |
} |
31 |
public void onError(Throwable t) { t.printStackTrace(); } |
32 |
public void onComplete() { |
33 |
if (count != ITEMS) |
34 |
System.out.println("Error: remaining " + (ITEMS - count)); |
35 |
phaser.arrive(); |
36 |
} |
37 |
} |
38 |
|
39 |
static final class Pub extends RecursiveAction { |
40 |
final SubmissionPublisher<Boolean> pub = |
41 |
new SubmissionPublisher<Boolean>(ForkJoinPool.commonPool(), CAP); |
42 |
public void compute() { |
43 |
SubmissionPublisher<Boolean> p = pub; |
44 |
for (int i = 0; i < CONSUMERS; ++i) |
45 |
p.subscribe(new Sub()); |
46 |
for (int i = 0; i < ITEMS; ++i) |
47 |
p.submit(Boolean.TRUE); |
48 |
p.close(); |
49 |
} |
50 |
} |
51 |
|
52 |
static final long NPS = (1000L * 1000 * 1000); |
53 |
|
54 |
public static void main(String[] args) throws Exception { |
55 |
int reps = REPS; |
56 |
if (args.length > 0) |
57 |
reps = Integer.parseInt(args[0]); |
58 |
|
59 |
System.out.println("ITEMS: " + ITEMS + |
60 |
" CONSUMERS: " + CONSUMERS + |
61 |
" CAP: " + CAP); |
62 |
for (int rep = 0; rep < reps; ++rep) { |
63 |
oneRun(); |
64 |
Thread.sleep(1000); |
65 |
} |
66 |
} |
67 |
|
68 |
static void oneRun() throws Exception { |
69 |
long startTime = System.nanoTime(); |
70 |
new Pub().fork(); |
71 |
phaser.arriveAndAwaitAdvance(); |
72 |
long elapsed = System.nanoTime() - startTime; |
73 |
double secs = ((double)elapsed) / NPS; |
74 |
System.out.printf("\tTime: %7.3f\n", secs); |
75 |
} |
76 |
|
77 |
} |