com.undefinedlabs.scope.deps.okhttp3.internal.http2.Ping Maven / Gradle / Ivy

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Scope is a APM for tests to give engineering teams unprecedented visibility into their CI process to quickly identify, troubleshoot and fix failed builds. This artifact contains dependencies for Scope.

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package com.undefinedlabs.scope.deps.okhttp3.internal.http2;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

final class Ping {
    private final CountDownLatch latch = new CountDownLatch(1);
    private long sent = -1;
    private long received = -1;

    Ping() {
    }

    void send() {
        if (sent != -1) throw new IllegalStateException();
        sent = System.nanoTime();
    }

    void receive() {
        if (received != -1 || sent == -1) throw new IllegalStateException();
        received = System.nanoTime();
        latch.countDown();
    }

    void cancel() {
        if (received != -1 || sent == -1) throw new IllegalStateException();
        received = sent - 1;
        latch.countDown();
    }

    /**
     * Returns the round trip time for this ping in nanoseconds, waiting for the response to arrive if
     * necessary. Returns -1 if the response was canceled.
     */
    public long roundTripTime() throws InterruptedException {
        latch.await();
        return received - sent;
    }

    /**
     * Returns the round trip time for this ping in nanoseconds, or -1 if the response was canceled,
     * or -2 if the timeout elapsed before the round trip completed.
     */
    public long roundTripTime(long timeout, TimeUnit unit) throws InterruptedException {
        if (latch.await(timeout, unit)) {
            return received - sent;
        } else {
            return -2;
        }
    }
}