import com.google.common.base.MoreObjects;
import com.google.common.base.MoreObjects.ToStringHelper;
import com.google.common.collect.ImmutableMap;
+import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import java.io.UnsupportedEncodingException;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;
// Accessed via SUBSCRIBERS, 'null' indicates we have been shut down
@SuppressWarnings("unused")
+ @SuppressFBWarnings(value = "URF_UNREAD_FIELD", justification = "https://github.com/spotbugs/spotbugs/issues/2749")
private volatile Subscribers<T> subscribers = Subscribers.empty();
@GuardedBy("this")