javax.servlet.SingleThreadModel Maven / Gradle / Ivy
/*
* Copyright (c) 1997-2018 Oracle and/or its affiliates. All rights reserved.
* Copyright 2004 The Apache Software Foundation
*
* Licensed 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.
*
* If a servlet implements this interface, you are guaranteed
* that no two threads will execute concurrently in the
* servlet's service 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.
*
*
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.
*
*
* @author Various
*
* @deprecated As of Java Servlet API 2.4, with no direct
* replacement.
*/
@Deprecated
public interface SingleThreadModel {
}