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Switch SntpClient to time.android.com and allow to set host.

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PiperOrigin-RevId: 333480727
This commit is contained in:
tonihei 2020-09-24 11:28:24 +01:00 committed by Oliver Woodman
parent 64aa634f9b
commit 30be792a15
1 changed files with 41 additions and 4 deletions
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45
library/core/src/main/java/com/google/android/exoplayer2/util/SntpClient.java
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@ -27,6 +27,7 @@ import java.net.DatagramPacket;
import java.net.DatagramSocket; import java.net.DatagramSocket;
import java.net.InetAddress; import java.net.InetAddress;
import java.util.Arrays; import java.util.Arrays;
import java.util.ConcurrentModificationException;
/** /**
* Static utility to retrieve the device time offset using SNTP. * Static utility to retrieve the device time offset using SNTP.
@ -37,6 +38,9 @@ import java.util.Arrays;
*/ */
public final class SntpClient { public final class SntpClient {
/** The default NTP host address used to retrieve {@link #getElapsedRealtimeOffsetMs()}. */
public static final String DEFAULT_NTP_HOST = "time.android.com";
/** Callback for calls to {@link #initialize(Loader, InitializationCallback)}. */ /** Callback for calls to {@link #initialize(Loader, InitializationCallback)}. */
public interface InitializationCallback { public interface InitializationCallback {
@ -51,7 +55,6 @@ public final class SntpClient {
void onInitializationFailed(IOException error); void onInitializationFailed(IOException error);
} }
private static final String NTP_HOST = "pool.ntp.org";
private static final int TIMEOUT_MS = 10_000; private static final int TIMEOUT_MS = 10_000;
private static final int ORIGINATE_TIME_OFFSET = 24; private static final int ORIGINATE_TIME_OFFSET = 24;
@ -80,8 +83,37 @@ public final class SntpClient {
@GuardedBy("valueLock") @GuardedBy("valueLock")
private static long elapsedRealtimeOffsetMs; private static long elapsedRealtimeOffsetMs;
@GuardedBy("valueLock")
private static String ntpHost = DEFAULT_NTP_HOST;
private SntpClient() {} private SntpClient() {}
/** Returns the NTP host address used to retrieve {@link #getElapsedRealtimeOffsetMs()}. */
public static String getNtpHost() {
synchronized (valueLock) {
return ntpHost;
}
}
/**
* Sets the NTP host address used to retrieve {@link #getElapsedRealtimeOffsetMs()}.
*
* <p>The default is {@link #DEFAULT_NTP_HOST}.
*
* <p>If the new host address is different from the previous one, the NTP client will be {@link
* #isInitialized()} uninitialized} again.
*
* @param ntpHost The NTP host address.
*/
public static void setNtpHost(String ntpHost) {
synchronized (valueLock) {
if (!SntpClient.ntpHost.equals(ntpHost)) {
SntpClient.ntpHost = ntpHost;
isInitialized = false;
}
}
}
/** /**
* Returns whether the device time offset has already been loaded. * Returns whether the device time offset has already been loaded.
* *
@ -129,7 +161,7 @@ public final class SntpClient {
} }
private static long loadNtpTimeOffsetMs() throws IOException { private static long loadNtpTimeOffsetMs() throws IOException {
InetAddress address = InetAddress.getByName(NTP_HOST); InetAddress address = InetAddress.getByName(getNtpHost());
try (DatagramSocket socket = new DatagramSocket()) { try (DatagramSocket socket = new DatagramSocket()) {
socket.setSoTimeout(TIMEOUT_MS); socket.setSoTimeout(TIMEOUT_MS);
byte[] buffer = new byte[NTP_PACKET_SIZE]; byte[] buffer = new byte[NTP_PACKET_SIZE];
@ -282,9 +314,14 @@ public final class SntpClient {
@Override @Override
public void onLoadCompleted(Loadable loadable, long elapsedRealtimeMs, long loadDurationMs) { public void onLoadCompleted(Loadable loadable, long elapsedRealtimeMs, long loadDurationMs) {
Assertions.checkState(SntpClient.isInitialized());
if (callback != null) { if (callback != null) {
callback.onInitialized(); if (!SntpClient.isInitialized()) {
// This may happen in the unlikely edge case of someone calling setNtpHost between the end
// of the load method and this callback.
callback.onInitializationFailed(new IOException(new ConcurrentModificationException()));
} else {
callback.onInitialized();
}
} }
} }