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java/javax/servlet/SingleThreadModel.java

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+/*
+ * 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
+}