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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> |
| <div class="block"><span class="deprecationComment">As of Java Servlet API 2.4, with no direct |
| replacement.</span></div> |
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| <br> |
| <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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