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1   /*
2    * Copyright 2015 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   https://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  
17  package io.netty.handler.ssl;
18  
19  /**
20   * Provides a way to get the application-level protocol name from ALPN or NPN.
21   */
22  interface ApplicationProtocolAccessor {
23      /**
24       * Returns the name of the negotiated application-level protocol.
25       *
26       * @return the application-level protocol name or
27       *         {@code null} if the negotiation failed or the client does not have ALPN/NPN extension
28       */
29      String getNegotiatedApplicationProtocol();
30  }