001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019 020 // 021 // This source code implements specifications defined by the Java 022 // Community Process. In order to remain compliant with the specification 023 // DO NOT add / change / or delete method signatures! 024 // 025 026 package javax.servlet; 027 028 /** 029 * Ensures that servlets handle 030 * only one request at a time. This interface has no methods. 031 * 032 * <p>If a servlet implements this interface, you are <i>guaranteed</i> 033 * that no two threads will execute concurrently in the 034 * servlet's <code>service</code> method. The servlet container 035 * can make this guarantee by synchronizing access to a single 036 * instance of the servlet, or by maintaining a pool of servlet 037 * instances and dispatching each new request to a free servlet. 038 * 039 * <p>Note that SingleThreadModel does not solve all thread safety 040 * issues. For example, session attributes and static variables can 041 * still be accessed by multiple requests on multiple threads 042 * at the same time, even when SingleThreadModel servlets are used. 043 * It is recommended that a developer take other means to resolve 044 * those issues instead of implementing this interface, such as 045 * avoiding the usage of an instance variable or synchronizing 046 * the block of the code accessing those resources. 047 * This interface is deprecated in Servlet API version 2.4. 048 * 049 * @deprecated As of Java Servlet API 2.4, with no direct 050 * replacement. 051 * 052 * @version $Rev: 467553 $ $Date: 2006-10-25 06:01:51 +0200 (Mi, 25. Okt 2006) $ 053 */ 054 public interface SingleThreadModel { 055 }