javax.servlet.SingleThreadModel Maven / Gradle / Ivy
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* JBoss, Home of Professional Open Source.
* Copyright 2007, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
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
{
}