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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *    * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *
 *    * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package io.grpc;

import java.util.concurrent.TimeUnit;

/**
 * A {@link Channel} that provides lifecycle management.
 */
public abstract class ManagedChannel extends Channel {
  /**
   * Initiates an orderly shutdown in which preexisting calls continue but new calls are immediately
   * cancelled.
   */
  public abstract ManagedChannel shutdown();

  /**
   * Returns whether the channel is shutdown. Shutdown channels immediately cancel any new calls,
   * but may still have some calls being processed.
   *
   * @see #shutdown()
   * @see #isTerminated()
   */
  public abstract boolean isShutdown();

  /**
   * Returns whether the channel is terminated. Terminated channels have no running calls and
   * relevant resources released (like TCP connections).
   *
   * @see #isShutdown()
   */
  public abstract boolean isTerminated();

  /**
   * Initiates a forceful shutdown in which preexisting and new calls are cancelled. Although
   * forceful, the shutdown process is still not instantaneous; {@link #isTerminated()} will likely
   * return {@code false} immediately after this method returns.
   */
  public abstract ManagedChannel shutdownNow();

  /**
   * Waits for the channel to become terminated, giving up if the timeout is reached.
   *
   * @return whether the channel is terminated, as would be done by {@link #isTerminated()}.
   */
  public abstract boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException;

  /**
   * Gets the current connectivity state. Note the result may soon become outdated.
   *
   * @param requestConnection if {@code true}, the channel will try to make a connection if it is
   *        currently IDLE
   *
   * @throws UnsupportedOperationException if not supported by implementation
   */
  @ExperimentalApi("https://github.com/grpc/grpc-java/issues/28")
  public ConnectivityState getState(boolean requestConnection) {
    throw new UnsupportedOperationException("Not implemented");
  }

  /**
   * Registers a one-off callback that will be run if the connectivity state of the channel diverges
   * from the given {@code source}, which is typically what has just been returned by {@link
   * #getState}.  If the states are already different, the callback will be called immediately.  The
   * callback is run in the same executor that runs Call listeners.
   *
   * @param source the assumed current state, typically just returned by {@link #getState}
   * @param callback the one-off callback
   *
   * @throws UnsupportedOperationException if not supported by implementation
   */
  @ExperimentalApi("https://github.com/grpc/grpc-java/issues/28")
  public void notifyWhenStateChanged(ConnectivityState source, Runnable callback) {
    throw new UnsupportedOperationException("Not implemented");
  }
}

@@ -1609,16 +1609,63 @@
 imeUnit;
+%0Aimport javax.annotation.concurrent.ThreadSafe;
 %0A%0A/**%0A *
@@ -1723,16 +1723,28 @@
 nt.%0A */%0A
+@ThreadSafe%0A
 public a

add missing @ThreadSafe annotation (#2823)