1 /*
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,
14 * software distributed under the License is distributed on an
15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16 * KIND, either express or implied. See the License for the
17 * specific language governing permissions and limitations
18 * under the License.
19 * ====================================================================
20 *
21 * This software consists of voluntary contributions made by many
22 * individuals on behalf of the Apache Software Foundation. For more
23 * information on the Apache Software Foundation, please see
24 * <http://www.apache.org/>.
25 *
26 */
27
28 package org.apache.http.client;
29
30 import org.apache.http.protocol.HttpContext;
31
32 /**
33 * A handler for determining if the given execution context is user specific
34 * or not. The token object returned by this handler is expected to uniquely
35 * identify the current user if the context is user specific or to be
36 * {@code null} if the context does not contain any resources or details
37 * specific to the current user.
38 * <p>
39 * The user token will be used to ensure that user specific resources will not
40 * be shared with or reused by other users.
41 * </p>
42 *
43 * @since 4.0
44 */
45 public interface UserTokenHandler {
46
47 /**
48 * The token object returned by this method is expected to uniquely
49 * identify the current user if the context is user specific or to be
50 * {@code null} if it is not.
51 *
52 * @param context the execution context
53 *
54 * @return user token that uniquely identifies the user or
55 * {@code null} if the context is not user specific.
56 */
57 Object getUserToken(HttpContext context);
58
59 }