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| <h2 title="Interface SingleThreadModel" class="title">Interface SingleThreadModel</h2> |
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| <div class="block"><span class="deprecatedLabel">Deprecated.</span> |
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| <pre>@Deprecated |
| public interface <span class="typeNameLabel">SingleThreadModel</span></pre> |
| <div class="block">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.</div> |
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