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Allow custom playback session id generator.

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This allows users to inject their own session id logic.

PiperOrigin-RevId: 306597785
This commit is contained in:
tonihei 2020-04-15 09:07:03 +01:00 committed by Ian Baker
parent 4d22121cde
commit 823419761f
1 changed files with 23 additions and 4 deletions
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27
library/core/src/main/java/com/google/android/exoplayer2/analytics/DefaultPlaybackSessionManager.java
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@ -24,6 +24,7 @@ import com.google.android.exoplayer2.Timeline;
import com.google.android.exoplayer2.analytics.AnalyticsListener.EventTime;
import com.google.android.exoplayer2.source.MediaSource.MediaPeriodId;
import com.google.android.exoplayer2.util.Assertions;
import com.google.android.exoplayer2.util.Supplier;
import com.google.android.exoplayer2.util.Util;
import java.util.HashMap;
import java.util.Iterator;
@ -34,23 +35,41 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
* Default {@link PlaybackSessionManager} which instantiates a new session for each window in the
* timeline and also for each ad within the windows.
*
* <p>Sessions are identified by Base64-encoded, URL-safe, random strings.
* <p>By default, sessions are identified by Base64-encoded, URL-safe, random strings.
*/
public final class DefaultPlaybackSessionManager implements PlaybackSessionManager {
/** Default generator for unique session ids that are random, Based64-encoded and URL-safe. */
public static final Supplier<String> DEFAULT_SESSION_ID_GENERATOR =
DefaultPlaybackSessionManager::generateDefaultSessionId;
private static final Random RANDOM = new Random();
private static final int SESSION_ID_LENGTH = 12;
private final Timeline.Window window;
private final Timeline.Period period;
private final HashMap<String, SessionDescriptor> sessions;
private final Supplier<String> sessionIdGenerator;
private @MonotonicNonNull Listener listener;
private Timeline currentTimeline;
@Nullable private String currentSessionId;
/** Creates session manager. */
/**
* Creates session manager with a {@link #DEFAULT_SESSION_ID_GENERATOR} to generate session ids.
*/
public DefaultPlaybackSessionManager() {
this(DEFAULT_SESSION_ID_GENERATOR);
}
/**
* Creates session manager.
*
* @param sessionIdGenerator A generator for new session ids. All generated session ids must be
* unique.
*/
public DefaultPlaybackSessionManager(Supplier<String> sessionIdGenerator) {
this.sessionIdGenerator = sessionIdGenerator;
window = new Timeline.Window();
period = new Timeline.Period();
sessions = new HashMap<>();
@ -207,14 +226,14 @@ public final class DefaultPlaybackSessionManager implements PlaybackSessionManag
}
}
if (bestMatch == null) {
String sessionId = generateSessionId();
String sessionId = sessionIdGenerator.get();
bestMatch = new SessionDescriptor(sessionId, windowIndex, mediaPeriodId);
sessions.put(sessionId, bestMatch);
}
return bestMatch;
}
private static String generateSessionId() {
private static String generateDefaultSessionId() {
byte[] randomBytes = new byte[SESSION_ID_LENGTH];
RANDOM.nextBytes(randomBytes);
return Base64.encodeToString(randomBytes, Base64.URL_SAFE | Base64.NO_WRAP);