singlethreadmodel.java

windows下的JAVA虚拟机

/*
* 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.
 *
 * <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.
 *
 *
 * @author	Various
 * @version	$Version$
 *
 * @deprecated	As of Java Servlet API 2.4, with no direct
 *	replacement.
 */

public interface SingleThreadModel {
}