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Java > Open Source Codes > javax > servlet > SingleThreadModel


1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package javax.servlet;
18
19 /**
20  * Ensures that servlets handle
21  * only one request at a time. This interface has no methods.
22  *
23  * <p>If a servlet implements this interface, you are <i>guaranteed</i>
24  * that no two threads will execute concurrently in the
25  * servlet's <code>service</code> method. The servlet container
26  * can make this guarantee by synchronizing access to a single
27  * instance of the servlet, or by maintaining a pool of servlet
28  * instances and dispatching each new request to a free servlet.
29  *
30  * <p>Note that SingleThreadModel does not solve all thread safety
31  * issues. For example, session attributes and static variables can
32  * still be accessed by multiple requests on multiple threads
33  * at the same time, even when SingleThreadModel servlets are used.
34  * It is recommended that a developer take other means to resolve
35  * those issues instead of implementing this interface, such as
36  * avoiding the usage of an instance variable or synchronizing
37  * the block of the code accessing those resources.
38  * This interface is deprecated in Servlet API version 2.4.
39  *
40  *
41  * @author Various
42  * @version $Version$
43  *
44  * @deprecated As of Java Servlet API 2.4, with no direct
45  * replacement.
46  */
47
48 public interface SingleThreadModel {
49 }
50
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