| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package javax.servlet; |
| |
| /** |
| * Ensures that servlets handle only one request at a time. This interface has |
| * no methods. |
| * <p> |
| * If a servlet implements this interface, you are <i>guaranteed</i> that no two |
| * threads will execute concurrently in the servlet's <code>service</code> |
| * method. The servlet container can make this guarantee by synchronizing access |
| * to a single instance of the servlet, or by maintaining a pool of servlet |
| * instances and dispatching each new request to a free servlet. |
| * <p> |
| * Note that SingleThreadModel does not solve all thread safety issues. For |
| * example, session attributes and static variables can still be accessed by |
| * multiple requests on multiple threads at the same time, even when |
| * SingleThreadModel servlets are used. It is recommended that a developer take |
| * other means to resolve those issues instead of implementing this interface, |
| * such as avoiding the usage of an instance variable or synchronizing the block |
| * of the code accessing those resources. This interface is deprecated in |
| * Servlet API version 2.4. |
| * |
| * @deprecated As of Java Servlet API 2.4, with no direct replacement. |
| */ |
| @SuppressWarnings("dep-ann") |
| // Spec API does not use @Deprecated |
| public interface SingleThreadModel { |
| // No methods |
| } |