1   package org.apache.hadoop.hbase;
2   /**
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *     http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing, software
14   * distributed under the License is distributed on an "AS IS" BASIS,
15   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16   * See the License for the specific language governing permissions and
17   * limitations under the License.
18   */
19  
20  /**
21   * Marker Interface used by ipc.  We need a means of referring to
22   * ipc "protocols" generically.  For example, we need to tell an rpc
23   * server the "protocols" it implements and it helps if all protocols
24   * implement a common 'type'.  That is what this Interface is used for.
25   */
26  // This Interface replaces the old VersionedProtocol Interface.  Rather
27  // than redo a bunch of code its removal, instead we put in place this
28  // Interface and change all VP references to Protocol references.
29  
30  // It is moved up here to top-level because it is ugly having members
31  // of super packages reach down into subpackages.
32  public interface IpcProtocol {}