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