72 lines
2.0 KiB
Java
72 lines
2.0 KiB
Java
/*
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* Copyright (C) 2012 Square, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.squareup.okhttp.internal.spdy;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.TimeUnit;
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/**
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* A locally-originated ping.
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*/
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public final class Ping {
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private final CountDownLatch latch = new CountDownLatch(1);
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private long sent = -1;
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private long received = -1;
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Ping() {
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}
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void send() {
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if (sent != -1) throw new IllegalStateException();
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sent = System.nanoTime();
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}
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void receive() {
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if (received != -1 || sent == -1) throw new IllegalStateException();
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received = System.nanoTime();
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latch.countDown();
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}
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void cancel() {
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if (received != -1 || sent == -1) throw new IllegalStateException();
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received = sent - 1;
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latch.countDown();
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}
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/**
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* Returns the round trip time for this ping in nanoseconds, waiting for the
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* response to arrive if necessary. Returns -1 if the response was
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* cancelled.
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*/
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public long roundTripTime() throws InterruptedException {
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latch.await();
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return received - sent;
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}
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/**
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* Returns the round trip time for this ping in nanoseconds, or -1 if the
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* response was cancelled, or -2 if the timeout elapsed before the round
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* trip completed.
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*/
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public long roundTripTime(long timeout, TimeUnit unit) throws InterruptedException {
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if (latch.await(timeout, unit)) {
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return received - sent;
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} else {
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return -2;
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}
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}
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}
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