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1   /**
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.hadoop.hbase.ipc;
19  
20  
21  public interface RpcCallContext extends Delayable {
22    /**
23     * Check if the caller who made this IPC call has disconnected.
24     * If called from outside the context of IPC, this does nothing.
25     * @return < 0 if the caller is still connected. The time in ms
26     *  since the disconnection otherwise
27     */
28    long disconnectSince();
29  
30    /**
31     * If the client connected and specified a codec to use, then we will use this codec making
32     * cellblocks to return.  If the client did not specify a codec, we assume it does not support
33     * cellblocks and will return all content protobuf'd (though it makes our serving slower).
34     * We need to ask this question per call because a server could be hosting both clients that
35     * support cellblocks while fielding requests from clients that do not.
36     * @return True if the client supports cellblocks, else return all content in pb
37     */
38    boolean isClientCellBlockSupport();
39  }