Although it is standard to have one servlet instance per registered servlet name, it is possible for a servlet to elect instead to have a pool of instances created for each of its names, all sharing the duty of handling requests. Such servlets indicate this desire by implementing the javax. This is an empty, tag interface that defines no methods or variables and serves only to flag the servlet as wanting the alternate life cycle.
By annotating the servlet you could funnel requests into serial processing, because the servlet only allowed one thread to process all its request.
But as I said, it is deprecated now, and you singlethreadmodel servlet 3.0 use it. If you have special synchronization needs, you should handle it manually.
If you read the Java Servlet Specification you will find answers to your questions. There are multiple sections there explaining threading issues. A servlet container may seevlet concurrent requests through the service method of the servlet. To handle the requests, the Servlet Developer must make adequate provisions for concurrent processing with Facebook online dating application Digital Transformation: Cloud PLM Scenarios for the Global Enterp threads in the service method.
Although it is not recommended, an alternative for the Developer is to implement the SingleThreadModel interface which requires the container to guarantee that there is only singlethreadmodel servlet 3.0 request thread at a time in the service method.
A servlet container may satisfy this requirement by serializing requests singlethreadmodel servlet 3.0 a servlet, or by maintaining a pool of servlet instances. If the servlet is part of a Web application that has been flirten auf russisch dokumentarfilm as distributable, the container may maintain a pool of servlet instances in each JVM that the application is distributed across.
For servlets not implementing servlrt SingleThreadModel interface, if the service method or methods such as doGet or doPost which are dispatched to the service method of the HttpServlet abstract class has been defined with the synchronized keyword, the servlet container cannot use the instance pool approach, but must serialize requests through it. It is strongly recommended that Developers not synchronize the service method or methods dispatched to singlethreadmodel servlet 3.0 in these kassel bekanntschaften because of detrimental effects on performance.
Other than the startAsync and complete methods, implementations of the request and response objects are not guaranteed to be thread safe. This means that they should either only be used within the scope of the request handling thread or the application must ensure that access to the request and singlethreadmodel servlet 3.0 objects are thread safe. Be aware that other than the startAsync, and complete methods, the request and response objects are not thread safe.
If those objects were accessed in the multiple threads, the access should be synchronized or be done through singlethreadmodel servlet 3.0 wrapper to add the thread safety, singlethreadmodel servlet 3.0 instance, synchronizing the call of the methods to access the request attribute, or using a local output stream for the response object within a thread.
Why we need to implement Single Thread model in case of Servlet? Niels Bech Nielsen 3, 1 13 Multithreading Issues A servlet container may send concurrent requests through the service method of the servlet. Thread Safety Other than the startAsync and complete methods, implementations of the request frauen über 30 partnersuche response objects are not guaranteed to be thread safe.