001    /**
002     *
003     * Copyright 2003-2004 The Apache Software Foundation
004     *
005     *  Licensed under the Apache License, Version 2.0 (the "License");
006     *  you may not use this file except in compliance with the License.
007     *  You may obtain a copy of the License at
008     *
009     *     http://www.apache.org/licenses/LICENSE-2.0
010     *
011     *  Unless required by applicable law or agreed to in writing, software
012     *  distributed under the License is distributed on an "AS IS" BASIS,
013     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     *  See the License for the specific language governing permissions and
015     *  limitations under the License.
016     */
017    
018    //
019    // This source code implements specifications defined by the Java
020    // Community Process. In order to remain compliant with the specification
021    // DO NOT add / change / or delete method signatures!
022    //
023    
024    package javax.servlet;
025    
026    /**
027     * Ensures that servlets handle
028     * only one request at a time. This interface has no methods.
029     *
030     * <p>If a servlet implements this interface, you are <i>guaranteed</i>
031     * that no two threads will execute concurrently in the
032     * servlet's <code>service</code> method. The servlet container
033     * can make this guarantee by synchronizing access to a single
034     * instance of the servlet, or by maintaining a pool of servlet
035     * instances and dispatching each new request to a free servlet.
036     *
037     * <p>Note that SingleThreadModel does not solve all thread safety
038     * issues.  For example, session attributes and static variables can
039     * still be accessed by multiple requests on multiple threads
040     * at the same time, even when SingleThreadModel servlets are used.
041     * It is recommended that a developer take other means to resolve
042     * those issues instead of implementing this interface, such as
043     * avoiding the usage of an instance variable or synchronizing
044     * the block of the code accessing those resources.
045     * This interface is deprecated in Servlet API version 2.4.
046     *
047     * @deprecated As of Java Servlet API 2.4, with no direct
048     * replacement.
049     *
050     * @version $Rev: 46019 $ $Date: 2004-09-14 02:56:06 -0700 (Tue, 14 Sep 2004) $
051     */
052    public interface SingleThreadModel {
053    }