/*
 * Copyright 2014, Google Inc. All rights reserved.
 *
 * 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,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package io.grpc;

import javax.annotation.Nullable;
import javax.annotation.concurrent.ThreadSafe;

/**
 * Mutable implementation of {@link HandlerRegistry}. Used by server implementations
 * that need to bind and unbind services that are exposed to remote clients.
 */
@ThreadSafe
public abstract class MutableHandlerRegistry extends HandlerRegistry {
  /**
   * Returns {@code null}, or previous service if {@code service} replaced an existing service.
   */
  @Nullable
  public abstract ServerServiceDefinition addService(ServerServiceDefinition service);

  /**
   * Returns {@code false} if {@code service} was not registered.
   */
  @Nullable
  public abstract boolean removeService(ServerServiceDefinition service);
}

@@ -1669,30 +1669,26 @@
 Mutable 
-implementation
+base class
  of %7B@li
@@ -1816,16 +1816,54 @@
 lients.%0A
+ *%0A * @see MutableHandlerRegistryImpl%0A
  */%0A@Thr

fix comment