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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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|
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import java.util.*; |
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import java.util.concurrent.*; |
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|
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/** |
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* One publisher, many subscribers |
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*/ |
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public class SubmissionPublisherLoops1 { |
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static final int ITEMS = 1 << 20; |
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static final int CONSUMERS = 64; |
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static final int CAP = Flow.defaultBufferSize(); |
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static final int REPS = 9; |
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|
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static final Phaser phaser = new Phaser(CONSUMERS + 1); |
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|
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static final class Sub implements Flow.Subscriber<Boolean> { |
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Flow.Subscription sn; |
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int count; |
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public void onSubscribe(Flow.Subscription s) { |
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(sn = s).request(CAP); |
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} |
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public void onNext(Boolean t) { |
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if ((++count & (CAP - 1)) == (CAP >>> 1)) |
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sn.request(CAP); |
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} |
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public void onError(Throwable t) { t.printStackTrace(); } |
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public void onComplete() { |
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if (count != ITEMS) |
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System.out.println("Error: remaining " + (ITEMS - count)); |
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phaser.arrive(); |
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} |
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} |
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|
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static final long NPS = (1000L * 1000 * 1000); |
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|
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public static void main(String[] args) throws Exception { |
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int reps = REPS; |
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if (args.length > 0) |
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reps = Integer.parseInt(args[0]); |
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|
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System.out.println("ITEMS: " + ITEMS + |
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" CONSUMERS: " + CONSUMERS + |
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" CAP: " + CAP); |
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ExecutorService exec = ForkJoinPool.commonPool(); |
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for (int rep = 0; rep < reps; ++rep) { |
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oneRun(exec); |
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System.out.println(exec); |
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Thread.sleep(1000); |
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} |
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if (exec != ForkJoinPool.commonPool()) |
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exec.shutdown(); |
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} |
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|
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static void oneRun(ExecutorService exec) throws Exception { |
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long startTime = System.nanoTime(); |
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final SubmissionPublisher<Boolean> pub = |
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new SubmissionPublisher<Boolean>(exec, CAP); |
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for (int i = 0; i < CONSUMERS; ++i) |
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pub.subscribe(new Sub()); |
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for (int i = 0; i < ITEMS; ++i) { |
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pub.submit(Boolean.TRUE); |
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} |
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pub.close(); |
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phaser.arriveAndAwaitAdvance(); |
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long elapsed = System.nanoTime() - startTime; |
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double secs = ((double)elapsed) / NPS; |
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System.out.printf("\tTime: %7.3f\n", secs); |
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} |
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} |
