More OAuth 2 settings

Author: acogoluegnes

src/main/java/com/rabbitmq/client/amqp/ConnectionSettings.java

@@ -161,6 +161,7 @@ public interface ConnectionSettings<T> {
    *
    * @return OAuth 2 settings
    * @see OAuth2Settings
+   * @since 0.4.0
    */
   OAuth2Settings<? extends T> oauth2();
 

src/main/java/com/rabbitmq/client/amqp/OAuth2Settings.java

@@ -26,6 +26,7 @@
  * <p>OAuth 2 requires RabbitMQ 4.1 or more.
  *
  * @param <T> the type of object returned by methods, usually the object itself
+ * @since 0.4.0
  */
 public interface OAuth2Settings<T> {
 

src/main/java/com/rabbitmq/client/amqp/oauth2/TokenCredentialsManager.java

@@ -37,6 +37,11 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+/**
+ * Credentials manager implementation that requests and refreshes tokens.
+ *
+ * <p>It also keeps track of registration and update them with refreshed tokens when appropriate.
+ */
 public final class TokenCredentialsManager implements CredentialsManager {
 
   public static final Function<Instant, Duration> DEFAULT_REFRESH_DELAY_STRATEGY =