okhttp3.internal.http2.Ping Maven / Gradle / Ivy
/*
* Copyright (C) 2012 Square, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package okhttp3.internal.http2;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
/**
* A locally-originated ping.
*/
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;
}
}
}